mirror of https://github.com/grpc/grpc.git
murgatroid99
9 years ago
commit
c04c03cb52
163 changed files with 3824 additions and 1233 deletions
@ -0,0 +1,501 @@ |
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/*
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include "src/core/client_config/resolvers/zookeeper_resolver.h" |
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#include <string.h> |
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#include <grpc/support/alloc.h> |
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#include <grpc/support/string_util.h> |
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#include <grpc/grpc_zookeeper.h> |
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#include <zookeeper/zookeeper.h> |
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#include "src/core/client_config/lb_policies/pick_first.h" |
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#include "src/core/client_config/resolver_registry.h" |
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#include "src/core/iomgr/resolve_address.h" |
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#include "src/core/support/string.h" |
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#include "src/core/json/json.h" |
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/** Zookeeper session expiration time in milliseconds */ |
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#define GRPC_ZOOKEEPER_SESSION_TIMEOUT 15000 |
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typedef struct { |
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/** base class: must be first */ |
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grpc_resolver base; |
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/** refcount */ |
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gpr_refcount refs; |
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/** name to resolve */ |
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char *name; |
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/** subchannel factory */ |
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grpc_subchannel_factory *subchannel_factory; |
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/** load balancing policy factory */ |
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grpc_lb_policy *(*lb_policy_factory)(grpc_subchannel **subchannels, |
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size_t num_subchannels); |
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/** mutex guarding the rest of the state */ |
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gpr_mu mu; |
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/** are we currently resolving? */ |
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int resolving; |
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/** which version of resolved_config have we published? */ |
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int published_version; |
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/** which version of resolved_config is current? */ |
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int resolved_version; |
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/** pending next completion, or NULL */ |
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grpc_iomgr_closure *next_completion; |
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/** target config address for next completion */ |
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grpc_client_config **target_config; |
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/** current (fully resolved) config */ |
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grpc_client_config *resolved_config; |
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/** zookeeper handle */ |
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zhandle_t *zookeeper_handle; |
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/** zookeeper resolved addresses */ |
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grpc_resolved_addresses *resolved_addrs; |
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/** total number of addresses to be resolved */ |
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int resolved_total; |
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/** number of addresses resolved */ |
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int resolved_num; |
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} zookeeper_resolver; |
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static void zookeeper_destroy(grpc_resolver *r); |
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static void zookeeper_start_resolving_locked(zookeeper_resolver *r); |
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static void zookeeper_maybe_finish_next_locked(zookeeper_resolver *r); |
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static void zookeeper_shutdown(grpc_resolver *r); |
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static void zookeeper_channel_saw_error(grpc_resolver *r, |
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struct sockaddr *failing_address, |
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int failing_address_len); |
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static void zookeeper_next(grpc_resolver *r, grpc_client_config **target_config, |
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grpc_iomgr_closure *on_complete); |
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static const grpc_resolver_vtable zookeeper_resolver_vtable = { |
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zookeeper_destroy, zookeeper_shutdown, zookeeper_channel_saw_error, |
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zookeeper_next}; |
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static void zookeeper_shutdown(grpc_resolver *resolver) { |
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zookeeper_resolver *r = (zookeeper_resolver *)resolver; |
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gpr_mu_lock(&r->mu); |
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if (r->next_completion != NULL) { |
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*r->target_config = NULL; |
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grpc_iomgr_add_callback(r->next_completion); |
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r->next_completion = NULL; |
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} |
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zookeeper_close(r->zookeeper_handle); |
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gpr_mu_unlock(&r->mu); |
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} |
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static void zookeeper_channel_saw_error(grpc_resolver *resolver, |
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struct sockaddr *sa, int len) { |
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zookeeper_resolver *r = (zookeeper_resolver *)resolver; |
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gpr_mu_lock(&r->mu); |
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if (r->resolving == 0) { |
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zookeeper_start_resolving_locked(r); |
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} |
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gpr_mu_unlock(&r->mu); |
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} |
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static void zookeeper_next(grpc_resolver *resolver, |
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grpc_client_config **target_config, |
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grpc_iomgr_closure *on_complete) { |
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zookeeper_resolver *r = (zookeeper_resolver *)resolver; |
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gpr_mu_lock(&r->mu); |
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GPR_ASSERT(r->next_completion == NULL); |
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r->next_completion = on_complete; |
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r->target_config = target_config; |
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if (r->resolved_version == 0 && r->resolving == 0) { |
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zookeeper_start_resolving_locked(r); |
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} else { |
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zookeeper_maybe_finish_next_locked(r); |
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} |
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gpr_mu_unlock(&r->mu); |
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} |
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/** Zookeeper global watcher for connection management
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TODO: better connection management besides logs */ |
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static void zookeeper_global_watcher(zhandle_t *zookeeper_handle, int type, |
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int state, const char *path, |
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void *watcher_ctx) { |
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if (type == ZOO_SESSION_EVENT) { |
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if (state == ZOO_EXPIRED_SESSION_STATE) { |
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gpr_log(GPR_ERROR, "Zookeeper session expired"); |
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} else if (state == ZOO_AUTH_FAILED_STATE) { |
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gpr_log(GPR_ERROR, "Zookeeper authentication failed"); |
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} |
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} |
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} |
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/** Zookeeper watcher triggered by changes to watched nodes
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Once triggered, it tries to resolve again to get updated addresses */ |
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static void zookeeper_watcher(zhandle_t *zookeeper_handle, int type, int state, |
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const char *path, void *watcher_ctx) { |
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if (watcher_ctx != NULL) { |
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zookeeper_resolver *r = (zookeeper_resolver *)watcher_ctx; |
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if (state == ZOO_CONNECTED_STATE) { |
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gpr_mu_lock(&r->mu); |
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if (r->resolving == 0) { |
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zookeeper_start_resolving_locked(r); |
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} |
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gpr_mu_unlock(&r->mu); |
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} |
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} |
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} |
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/** Callback function after getting all resolved addresses
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Creates a subchannel for each address */ |
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static void zookeeper_on_resolved(void *arg, |
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grpc_resolved_addresses *addresses) { |
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zookeeper_resolver *r = arg; |
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grpc_client_config *config = NULL; |
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grpc_subchannel **subchannels; |
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grpc_subchannel_args args; |
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grpc_lb_policy *lb_policy; |
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size_t i; |
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if (addresses != NULL) { |
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config = grpc_client_config_create(); |
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subchannels = gpr_malloc(sizeof(grpc_subchannel *) * addresses->naddrs); |
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for (i = 0; i < addresses->naddrs; i++) { |
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memset(&args, 0, sizeof(args)); |
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args.addr = (struct sockaddr *)(addresses->addrs[i].addr); |
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args.addr_len = addresses->addrs[i].len; |
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subchannels[i] = grpc_subchannel_factory_create_subchannel( |
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r->subchannel_factory, &args); |
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} |
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lb_policy = r->lb_policy_factory(subchannels, addresses->naddrs); |
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grpc_client_config_set_lb_policy(config, lb_policy); |
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GRPC_LB_POLICY_UNREF(lb_policy, "construction"); |
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grpc_resolved_addresses_destroy(addresses); |
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gpr_free(subchannels); |
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} |
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gpr_mu_lock(&r->mu); |
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GPR_ASSERT(r->resolving == 1); |
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r->resolving = 0; |
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if (r->resolved_config != NULL) { |
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grpc_client_config_unref(r->resolved_config); |
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} |
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r->resolved_config = config; |
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r->resolved_version++; |
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zookeeper_maybe_finish_next_locked(r); |
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gpr_mu_unlock(&r->mu); |
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GRPC_RESOLVER_UNREF(&r->base, "zookeeper-resolving"); |
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} |
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/** Callback function for each DNS resolved address */ |
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static void zookeeper_dns_resolved(void *arg, |
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grpc_resolved_addresses *addresses) { |
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size_t i; |
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zookeeper_resolver *r = arg; |
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int resolve_done = 0; |
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gpr_mu_lock(&r->mu); |
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r->resolved_num++; |
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r->resolved_addrs->addrs = |
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gpr_realloc(r->resolved_addrs->addrs, |
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sizeof(grpc_resolved_address) * |
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(r->resolved_addrs->naddrs + addresses->naddrs)); |
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for (i = 0; i < addresses->naddrs; i++) { |
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memcpy(r->resolved_addrs->addrs[i + r->resolved_addrs->naddrs].addr, |
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addresses->addrs[i].addr, addresses->addrs[i].len); |
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r->resolved_addrs->addrs[i + r->resolved_addrs->naddrs].len = |
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addresses->addrs[i].len; |
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} |
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r->resolved_addrs->naddrs += addresses->naddrs; |
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grpc_resolved_addresses_destroy(addresses); |
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/** Wait for all addresses to be resolved */ |
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resolve_done = (r->resolved_num == r->resolved_total); |
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gpr_mu_unlock(&r->mu); |
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if (resolve_done) { |
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zookeeper_on_resolved(r, r->resolved_addrs); |
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} |
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} |
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/** Parses JSON format address of a zookeeper node */ |
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static char *zookeeper_parse_address(const char *value, int value_len) { |
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grpc_json *json; |
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grpc_json *cur; |
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const char *host; |
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const char *port; |
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char* buffer; |
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char *address = NULL; |
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buffer = gpr_malloc(value_len); |
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memcpy(buffer, value, value_len); |
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json = grpc_json_parse_string_with_len(buffer, value_len); |
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if (json != NULL) { |
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host = NULL; |
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port = NULL; |
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for (cur = json->child; cur != NULL; cur = cur->next) { |
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if (!strcmp(cur->key, "host")) { |
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host = cur->value; |
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if (port != NULL) { |
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break; |
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} |
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} else if (!strcmp(cur->key, "port")) { |
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port = cur->value; |
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if (host != NULL) { |
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break; |
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} |
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} |
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} |
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if (host != NULL && port != NULL) { |
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gpr_asprintf(&address, "%s:%s", host, port); |
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} |
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grpc_json_destroy(json); |
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} |
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gpr_free(buffer); |
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return address; |
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} |
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static void zookeeper_get_children_node_completion(int rc, const char *value, |
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int value_len, |
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const struct Stat *stat, |
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const void *arg) { |
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char *address = NULL; |
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zookeeper_resolver *r = (zookeeper_resolver *)arg; |
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int resolve_done = 0; |
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if (rc != 0) { |
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gpr_log(GPR_ERROR, "Error in getting a child node of %s", r->name); |
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return; |
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} |
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address = zookeeper_parse_address(value, value_len); |
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if (address != NULL) { |
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/** Further resolves address by DNS */ |
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grpc_resolve_address(address, NULL, zookeeper_dns_resolved, r); |
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gpr_free(address); |
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} else { |
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gpr_log(GPR_ERROR, "Error in resolving a child node of %s", r->name); |
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gpr_mu_lock(&r->mu); |
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r->resolved_total--; |
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resolve_done = (r->resolved_num == r->resolved_total); |
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gpr_mu_unlock(&r->mu); |
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if (resolve_done) { |
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zookeeper_on_resolved(r, r->resolved_addrs); |
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} |
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} |
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} |
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static void zookeeper_get_children_completion( |
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int rc, const struct String_vector *children, const void *arg) { |
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char *path; |
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int status; |
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int i; |
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zookeeper_resolver *r = (zookeeper_resolver *)arg; |
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if (rc != 0) { |
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gpr_log(GPR_ERROR, "Error in getting zookeeper children of %s", r->name); |
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return; |
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} |
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if (children->count == 0) { |
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gpr_log(GPR_ERROR, "Error in resolving zookeeper address %s", r->name); |
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return; |
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} |
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r->resolved_addrs = gpr_malloc(sizeof(grpc_resolved_addresses)); |
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r->resolved_addrs->addrs = NULL; |
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r->resolved_addrs->naddrs = 0; |
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r->resolved_total = children->count; |
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/** TODO: Replace expensive heap allocation with stack
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if we can get maximum length of zookeeper path */ |
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for (i = 0; i < children->count; i++) { |
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gpr_asprintf(&path, "%s/%s", r->name, children->data[i]); |
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status = zoo_awget(r->zookeeper_handle, path, zookeeper_watcher, r, |
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zookeeper_get_children_node_completion, r); |
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gpr_free(path); |
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if (status != 0) { |
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gpr_log(GPR_ERROR, "Error in getting zookeeper node %s", path); |
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} |
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} |
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} |
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static void zookeeper_get_node_completion(int rc, const char *value, |
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int value_len, |
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const struct Stat *stat, |
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const void *arg) { |
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int status; |
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char *address = NULL; |
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zookeeper_resolver *r = (zookeeper_resolver *)arg; |
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r->resolved_addrs = NULL; |
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r->resolved_total = 0; |
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r->resolved_num = 0; |
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if (rc != 0) { |
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gpr_log(GPR_ERROR, "Error in getting zookeeper node %s", r->name); |
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return; |
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} |
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/** If zookeeper node of path r->name does not have address
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(i.e. service node), get its children */ |
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address = zookeeper_parse_address(value, value_len); |
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if (address != NULL) { |
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r->resolved_addrs = gpr_malloc(sizeof(grpc_resolved_addresses)); |
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r->resolved_addrs->addrs = NULL; |
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r->resolved_addrs->naddrs = 0; |
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r->resolved_total = 1; |
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/** Further resolves address by DNS */ |
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grpc_resolve_address(address, NULL, zookeeper_dns_resolved, r); |
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gpr_free(address); |
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return; |
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} |
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status = zoo_awget_children(r->zookeeper_handle, r->name, zookeeper_watcher, |
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r, zookeeper_get_children_completion, r); |
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if (status != 0) { |
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gpr_log(GPR_ERROR, "Error in getting zookeeper children of %s", r->name); |
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} |
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} |
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static void zookeeper_resolve_address(zookeeper_resolver *r) { |
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int status; |
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status = zoo_awget(r->zookeeper_handle, r->name, zookeeper_watcher, r, |
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zookeeper_get_node_completion, r); |
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if (status != 0) { |
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gpr_log(GPR_ERROR, "Error in getting zookeeper node %s", r->name); |
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} |
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} |
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static void zookeeper_start_resolving_locked(zookeeper_resolver *r) { |
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GRPC_RESOLVER_REF(&r->base, "zookeeper-resolving"); |
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GPR_ASSERT(r->resolving == 0); |
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r->resolving = 1; |
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zookeeper_resolve_address(r); |
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} |
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static void zookeeper_maybe_finish_next_locked(zookeeper_resolver *r) { |
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if (r->next_completion != NULL && |
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r->resolved_version != r->published_version) { |
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*r->target_config = r->resolved_config; |
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if (r->resolved_config != NULL) { |
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grpc_client_config_ref(r->resolved_config); |
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} |
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grpc_iomgr_add_callback(r->next_completion); |
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r->next_completion = NULL; |
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r->published_version = r->resolved_version; |
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} |
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} |
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static void zookeeper_destroy(grpc_resolver *gr) { |
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zookeeper_resolver *r = (zookeeper_resolver *)gr; |
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gpr_mu_destroy(&r->mu); |
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if (r->resolved_config != NULL) { |
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grpc_client_config_unref(r->resolved_config); |
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} |
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grpc_subchannel_factory_unref(r->subchannel_factory); |
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gpr_free(r->name); |
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gpr_free(r); |
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} |
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static grpc_resolver *zookeeper_create( |
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grpc_uri *uri, |
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grpc_lb_policy *(*lb_policy_factory)(grpc_subchannel **subchannels, |
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size_t num_subchannels), |
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grpc_subchannel_factory *subchannel_factory) { |
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zookeeper_resolver *r; |
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size_t length; |
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char *path = uri->path; |
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if (0 == strcmp(uri->authority, "")) { |
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gpr_log(GPR_ERROR, "No authority specified in zookeeper uri"); |
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return NULL; |
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} |
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/** Removes the trailing slash if exists */ |
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length = strlen(path); |
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if (length > 1 && path[length - 1] == '/') { |
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path[length - 1] = 0; |
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} |
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r = gpr_malloc(sizeof(zookeeper_resolver)); |
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memset(r, 0, sizeof(*r)); |
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gpr_ref_init(&r->refs, 1); |
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gpr_mu_init(&r->mu); |
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grpc_resolver_init(&r->base, &zookeeper_resolver_vtable); |
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r->name = gpr_strdup(path); |
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r->subchannel_factory = subchannel_factory; |
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r->lb_policy_factory = lb_policy_factory; |
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grpc_subchannel_factory_ref(subchannel_factory); |
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|
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/** Initializes zookeeper client */ |
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zoo_set_debug_level(ZOO_LOG_LEVEL_WARN); |
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r->zookeeper_handle = zookeeper_init(uri->authority, zookeeper_global_watcher, |
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GRPC_ZOOKEEPER_SESSION_TIMEOUT, 0, 0, 0); |
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if (r->zookeeper_handle == NULL) { |
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gpr_log(GPR_ERROR, "Unable to connect to zookeeper server"); |
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return NULL; |
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} |
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return &r->base; |
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} |
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static void zookeeper_plugin_init() { |
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grpc_register_resolver_type("zookeeper", |
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grpc_zookeeper_resolver_factory_create()); |
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} |
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|
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void grpc_zookeeper_register() { |
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grpc_register_plugin(zookeeper_plugin_init, NULL); |
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} |
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|
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/*
|
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* FACTORY |
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*/ |
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|
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static void zookeeper_factory_ref(grpc_resolver_factory *factory) {} |
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|
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static void zookeeper_factory_unref(grpc_resolver_factory *factory) {} |
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|
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static grpc_resolver *zookeeper_factory_create_resolver( |
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grpc_resolver_factory *factory, grpc_uri *uri, |
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grpc_subchannel_factory *subchannel_factory) { |
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return zookeeper_create(uri, grpc_create_pick_first_lb_policy, |
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subchannel_factory); |
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} |
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|
||||
static const grpc_resolver_factory_vtable zookeeper_factory_vtable = { |
||||
zookeeper_factory_ref, zookeeper_factory_unref, |
||||
zookeeper_factory_create_resolver}; |
||||
static grpc_resolver_factory zookeeper_resolver_factory = { |
||||
&zookeeper_factory_vtable}; |
||||
|
||||
grpc_resolver_factory *grpc_zookeeper_resolver_factory_create() { |
||||
return &zookeeper_resolver_factory; |
||||
} |
||||
@ -0,0 +1,42 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
#ifndef GRPC_INTERNAL_CORE_CLIENT_CONFIG_RESOLVERS_ZOOKEEPER_RESOLVER_H |
||||
#define GRPC_INTERNAL_CORE_CLIENT_CONFIG_RESOLVERS_ZOOKEEPER_RESOLVER_H |
||||
|
||||
#include "src/core/client_config/resolver_factory.h" |
||||
|
||||
/** Create a zookeeper resolver factory */ |
||||
grpc_resolver_factory *grpc_zookeeper_resolver_factory_create(void); |
||||
|
||||
#endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_RESOLVERS_ZOOKEEPER_RESOLVER_H */ |
||||
@ -0,0 +1,438 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
/* FIXME: "posix" files shouldn't be depending on _GNU_SOURCE */ |
||||
#ifndef _GNU_SOURCE |
||||
#define _GNU_SOURCE |
||||
#endif |
||||
|
||||
#include <grpc/support/port_platform.h> |
||||
|
||||
#ifdef GPR_POSIX_SOCKET |
||||
|
||||
#include "src/core/iomgr/udp_server.h" |
||||
|
||||
#include <errno.h> |
||||
#include <fcntl.h> |
||||
#include <limits.h> |
||||
#include <netinet/in.h> |
||||
#include <netinet/tcp.h> |
||||
#include <string.h> |
||||
#include <sys/socket.h> |
||||
#include <sys/stat.h> |
||||
#include <sys/types.h> |
||||
#include <sys/un.h> |
||||
#include <unistd.h> |
||||
|
||||
#include "src/core/iomgr/fd_posix.h" |
||||
#include "src/core/iomgr/pollset_posix.h" |
||||
#include "src/core/iomgr/resolve_address.h" |
||||
#include "src/core/iomgr/sockaddr_utils.h" |
||||
#include "src/core/iomgr/socket_utils_posix.h" |
||||
#include "src/core/support/string.h" |
||||
#include <grpc/support/alloc.h> |
||||
#include <grpc/support/log.h> |
||||
#include <grpc/support/sync.h> |
||||
#include <grpc/support/string_util.h> |
||||
#include <grpc/support/time.h> |
||||
|
||||
#define INIT_PORT_CAP 2 |
||||
|
||||
/* one listening port */ |
||||
typedef struct { |
||||
int fd; |
||||
grpc_fd *emfd; |
||||
grpc_udp_server *server; |
||||
union { |
||||
gpr_uint8 untyped[GRPC_MAX_SOCKADDR_SIZE]; |
||||
struct sockaddr sockaddr; |
||||
struct sockaddr_un un; |
||||
} addr; |
||||
int addr_len; |
||||
grpc_iomgr_closure read_closure; |
||||
grpc_iomgr_closure destroyed_closure; |
||||
grpc_udp_server_read_cb read_cb; |
||||
} server_port; |
||||
|
||||
static void unlink_if_unix_domain_socket(const struct sockaddr_un *un) { |
||||
struct stat st; |
||||
|
||||
if (stat(un->sun_path, &st) == 0 && (st.st_mode & S_IFMT) == S_IFSOCK) { |
||||
unlink(un->sun_path); |
||||
} |
||||
} |
||||
|
||||
/* the overall server */ |
||||
struct grpc_udp_server { |
||||
grpc_udp_server_cb cb; |
||||
void *cb_arg; |
||||
|
||||
gpr_mu mu; |
||||
gpr_cv cv; |
||||
|
||||
/* active port count: how many ports are actually still listening */ |
||||
size_t active_ports; |
||||
/* destroyed port count: how many ports are completely destroyed */ |
||||
size_t destroyed_ports; |
||||
|
||||
/* is this server shutting down? (boolean) */ |
||||
int shutdown; |
||||
|
||||
/* all listening ports */ |
||||
server_port *ports; |
||||
size_t nports; |
||||
size_t port_capacity; |
||||
|
||||
/* shutdown callback */ |
||||
void (*shutdown_complete)(void *); |
||||
void *shutdown_complete_arg; |
||||
|
||||
/* all pollsets interested in new connections */ |
||||
grpc_pollset **pollsets; |
||||
/* number of pollsets in the pollsets array */ |
||||
size_t pollset_count; |
||||
}; |
||||
|
||||
grpc_udp_server *grpc_udp_server_create(void) { |
||||
grpc_udp_server *s = gpr_malloc(sizeof(grpc_udp_server)); |
||||
gpr_mu_init(&s->mu); |
||||
gpr_cv_init(&s->cv); |
||||
s->active_ports = 0; |
||||
s->destroyed_ports = 0; |
||||
s->shutdown = 0; |
||||
s->cb = NULL; |
||||
s->cb_arg = NULL; |
||||
s->ports = gpr_malloc(sizeof(server_port) * INIT_PORT_CAP); |
||||
s->nports = 0; |
||||
s->port_capacity = INIT_PORT_CAP; |
||||
|
||||
return s; |
||||
} |
||||
|
||||
static void finish_shutdown(grpc_udp_server *s) { |
||||
s->shutdown_complete(s->shutdown_complete_arg); |
||||
|
||||
gpr_mu_destroy(&s->mu); |
||||
gpr_cv_destroy(&s->cv); |
||||
|
||||
gpr_free(s->ports); |
||||
gpr_free(s); |
||||
} |
||||
|
||||
static void destroyed_port(void *server, int success) { |
||||
grpc_udp_server *s = server; |
||||
gpr_mu_lock(&s->mu); |
||||
s->destroyed_ports++; |
||||
if (s->destroyed_ports == s->nports) { |
||||
gpr_mu_unlock(&s->mu); |
||||
finish_shutdown(s); |
||||
} else { |
||||
gpr_mu_unlock(&s->mu); |
||||
} |
||||
} |
||||
|
||||
static void dont_care_about_shutdown_completion(void *ignored) {} |
||||
|
||||
/* called when all listening endpoints have been shutdown, so no further
|
||||
events will be received on them - at this point it's safe to destroy |
||||
things */ |
||||
static void deactivated_all_ports(grpc_udp_server *s) { |
||||
size_t i; |
||||
|
||||
/* delete ALL the things */ |
||||
gpr_mu_lock(&s->mu); |
||||
|
||||
if (!s->shutdown) { |
||||
gpr_mu_unlock(&s->mu); |
||||
return; |
||||
} |
||||
|
||||
if (s->nports) { |
||||
for (i = 0; i < s->nports; i++) { |
||||
server_port *sp = &s->ports[i]; |
||||
if (sp->addr.sockaddr.sa_family == AF_UNIX) { |
||||
unlink_if_unix_domain_socket(&sp->addr.un); |
||||
} |
||||
sp->destroyed_closure.cb = destroyed_port; |
||||
sp->destroyed_closure.cb_arg = s; |
||||
grpc_fd_orphan(sp->emfd, &sp->destroyed_closure, "udp_listener_shutdown"); |
||||
} |
||||
gpr_mu_unlock(&s->mu); |
||||
} else { |
||||
gpr_mu_unlock(&s->mu); |
||||
finish_shutdown(s); |
||||
} |
||||
} |
||||
|
||||
void grpc_udp_server_destroy( |
||||
grpc_udp_server *s, void (*shutdown_complete)(void *shutdown_complete_arg), |
||||
void *shutdown_complete_arg) { |
||||
size_t i; |
||||
gpr_mu_lock(&s->mu); |
||||
|
||||
GPR_ASSERT(!s->shutdown); |
||||
s->shutdown = 1; |
||||
|
||||
s->shutdown_complete = shutdown_complete |
||||
? shutdown_complete |
||||
: dont_care_about_shutdown_completion; |
||||
s->shutdown_complete_arg = shutdown_complete_arg; |
||||
|
||||
/* shutdown all fd's */ |
||||
if (s->active_ports) { |
||||
for (i = 0; i < s->nports; i++) { |
||||
grpc_fd_shutdown(s->ports[i].emfd); |
||||
} |
||||
gpr_mu_unlock(&s->mu); |
||||
} else { |
||||
gpr_mu_unlock(&s->mu); |
||||
deactivated_all_ports(s); |
||||
} |
||||
} |
||||
|
||||
/* Prepare a recently-created socket for listening. */ |
||||
static int prepare_socket(int fd, const struct sockaddr *addr, int addr_len) { |
||||
struct sockaddr_storage sockname_temp; |
||||
socklen_t sockname_len; |
||||
int get_local_ip; |
||||
int rc; |
||||
|
||||
if (fd < 0) { |
||||
goto error; |
||||
} |
||||
|
||||
get_local_ip = 1; |
||||
rc = setsockopt(fd, IPPROTO_IP, IP_PKTINFO, |
||||
&get_local_ip, sizeof(get_local_ip)); |
||||
if (rc == 0 && addr->sa_family == AF_INET6) { |
||||
rc = setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, |
||||
&get_local_ip, sizeof(get_local_ip)); |
||||
} |
||||
|
||||
if (bind(fd, addr, addr_len) < 0) { |
||||
char *addr_str; |
||||
grpc_sockaddr_to_string(&addr_str, addr, 0); |
||||
gpr_log(GPR_ERROR, "bind addr=%s: %s", addr_str, strerror(errno)); |
||||
gpr_free(addr_str); |
||||
goto error; |
||||
} |
||||
|
||||
sockname_len = sizeof(sockname_temp); |
||||
if (getsockname(fd, (struct sockaddr *)&sockname_temp, &sockname_len) < 0) { |
||||
goto error; |
||||
} |
||||
|
||||
return grpc_sockaddr_get_port((struct sockaddr *)&sockname_temp); |
||||
|
||||
error: |
||||
if (fd >= 0) { |
||||
close(fd); |
||||
} |
||||
return -1; |
||||
} |
||||
|
||||
/* event manager callback when reads are ready */ |
||||
static void on_read(void *arg, int success) { |
||||
server_port *sp = arg; |
||||
|
||||
if (success == 0) { |
||||
gpr_mu_lock(&sp->server->mu); |
||||
if (0 == --sp->server->active_ports) { |
||||
gpr_mu_unlock(&sp->server->mu); |
||||
deactivated_all_ports(sp->server); |
||||
} else { |
||||
gpr_mu_unlock(&sp->server->mu); |
||||
} |
||||
return; |
||||
} |
||||
|
||||
/* Tell the registered callback that data is available to read. */ |
||||
GPR_ASSERT(sp->read_cb); |
||||
sp->read_cb(sp->fd, sp->server->cb, sp->server->cb_arg); |
||||
|
||||
/* Re-arm the notification event so we get another chance to read. */ |
||||
grpc_fd_notify_on_read(sp->emfd, &sp->read_closure); |
||||
} |
||||
|
||||
static int add_socket_to_server(grpc_udp_server *s, int fd, |
||||
const struct sockaddr *addr, int addr_len, |
||||
grpc_udp_server_read_cb read_cb) { |
||||
server_port *sp; |
||||
int port; |
||||
char *addr_str; |
||||
char *name; |
||||
|
||||
port = prepare_socket(fd, addr, addr_len); |
||||
if (port >= 0) { |
||||
grpc_sockaddr_to_string(&addr_str, (struct sockaddr *)&addr, 1); |
||||
gpr_asprintf(&name, "udp-server-listener:%s", addr_str); |
||||
gpr_mu_lock(&s->mu); |
||||
GPR_ASSERT(!s->cb && "must add ports before starting server"); |
||||
/* append it to the list under a lock */ |
||||
if (s->nports == s->port_capacity) { |
||||
s->port_capacity *= 2; |
||||
s->ports = gpr_realloc(s->ports, sizeof(server_port) * s->port_capacity); |
||||
} |
||||
sp = &s->ports[s->nports++]; |
||||
sp->server = s; |
||||
sp->fd = fd; |
||||
sp->emfd = grpc_fd_create(fd, name); |
||||
memcpy(sp->addr.untyped, addr, addr_len); |
||||
sp->addr_len = addr_len; |
||||
sp->read_cb = read_cb; |
||||
GPR_ASSERT(sp->emfd); |
||||
gpr_mu_unlock(&s->mu); |
||||
} |
||||
|
||||
return port; |
||||
} |
||||
|
||||
int grpc_udp_server_add_port(grpc_udp_server *s, const void *addr, |
||||
int addr_len, grpc_udp_server_read_cb read_cb) { |
||||
int allocated_port1 = -1; |
||||
int allocated_port2 = -1; |
||||
unsigned i; |
||||
int fd; |
||||
grpc_dualstack_mode dsmode; |
||||
struct sockaddr_in6 addr6_v4mapped; |
||||
struct sockaddr_in wild4; |
||||
struct sockaddr_in6 wild6; |
||||
struct sockaddr_in addr4_copy; |
||||
struct sockaddr *allocated_addr = NULL; |
||||
struct sockaddr_storage sockname_temp; |
||||
socklen_t sockname_len; |
||||
int port; |
||||
|
||||
if (((struct sockaddr *)addr)->sa_family == AF_UNIX) { |
||||
unlink_if_unix_domain_socket(addr); |
||||
} |
||||
|
||||
/* Check if this is a wildcard port, and if so, try to keep the port the same
|
||||
as some previously created listener. */ |
||||
if (grpc_sockaddr_get_port(addr) == 0) { |
||||
for (i = 0; i < s->nports; i++) { |
||||
sockname_len = sizeof(sockname_temp); |
||||
if (0 == getsockname(s->ports[i].fd, (struct sockaddr *)&sockname_temp, |
||||
&sockname_len)) { |
||||
port = grpc_sockaddr_get_port((struct sockaddr *)&sockname_temp); |
||||
if (port > 0) { |
||||
allocated_addr = malloc(addr_len); |
||||
memcpy(allocated_addr, addr, addr_len); |
||||
grpc_sockaddr_set_port(allocated_addr, port); |
||||
addr = allocated_addr; |
||||
break; |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { |
||||
addr = (const struct sockaddr *)&addr6_v4mapped; |
||||
addr_len = sizeof(addr6_v4mapped); |
||||
} |
||||
|
||||
/* Treat :: or 0.0.0.0 as a family-agnostic wildcard. */ |
||||
if (grpc_sockaddr_is_wildcard(addr, &port)) { |
||||
grpc_sockaddr_make_wildcards(port, &wild4, &wild6); |
||||
|
||||
/* Try listening on IPv6 first. */ |
||||
addr = (struct sockaddr *)&wild6; |
||||
addr_len = sizeof(wild6); |
||||
fd = grpc_create_dualstack_socket(addr, SOCK_DGRAM, IPPROTO_UDP, &dsmode); |
||||
allocated_port1 = add_socket_to_server(s, fd, addr, addr_len, read_cb); |
||||
if (fd >= 0 && dsmode == GRPC_DSMODE_DUALSTACK) { |
||||
goto done; |
||||
} |
||||
|
||||
/* If we didn't get a dualstack socket, also listen on 0.0.0.0. */ |
||||
if (port == 0 && allocated_port1 > 0) { |
||||
grpc_sockaddr_set_port((struct sockaddr *)&wild4, allocated_port1); |
||||
} |
||||
addr = (struct sockaddr *)&wild4; |
||||
addr_len = sizeof(wild4); |
||||
} |
||||
|
||||
fd = grpc_create_dualstack_socket(addr, SOCK_DGRAM, IPPROTO_UDP, &dsmode); |
||||
if (fd < 0) { |
||||
gpr_log(GPR_ERROR, "Unable to create socket: %s", strerror(errno)); |
||||
} |
||||
if (dsmode == GRPC_DSMODE_IPV4 && |
||||
grpc_sockaddr_is_v4mapped(addr, &addr4_copy)) { |
||||
addr = (struct sockaddr *)&addr4_copy; |
||||
addr_len = sizeof(addr4_copy); |
||||
} |
||||
allocated_port2 = add_socket_to_server(s, fd, addr, addr_len, read_cb); |
||||
|
||||
done: |
||||
gpr_free(allocated_addr); |
||||
return allocated_port1 >= 0 ? allocated_port1 : allocated_port2; |
||||
} |
||||
|
||||
int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned index) { |
||||
return (index < s->nports) ? s->ports[index].fd : -1; |
||||
} |
||||
|
||||
void grpc_udp_server_start(grpc_udp_server *s, grpc_pollset **pollsets, |
||||
size_t pollset_count, |
||||
grpc_udp_server_cb new_transport_cb, void *cb_arg) { |
||||
size_t i, j; |
||||
GPR_ASSERT(new_transport_cb); |
||||
gpr_mu_lock(&s->mu); |
||||
GPR_ASSERT(!s->cb); |
||||
GPR_ASSERT(s->active_ports == 0); |
||||
s->cb = new_transport_cb; |
||||
s->cb_arg = cb_arg; |
||||
s->pollsets = pollsets; |
||||
for (i = 0; i < s->nports; i++) { |
||||
for (j = 0; j < pollset_count; j++) { |
||||
grpc_pollset_add_fd(pollsets[j], s->ports[i].emfd); |
||||
} |
||||
s->ports[i].read_closure.cb = on_read; |
||||
s->ports[i].read_closure.cb_arg = &s->ports[i]; |
||||
grpc_fd_notify_on_read(s->ports[i].emfd, &s->ports[i].read_closure); |
||||
s->active_ports++; |
||||
} |
||||
gpr_mu_unlock(&s->mu); |
||||
} |
||||
|
||||
/* TODO(rjshade): Add a test for this method. */ |
||||
void grpc_udp_server_write(server_port *sp, const char *buffer, size_t buf_len, |
||||
const struct sockaddr *peer_address) { |
||||
int rc; |
||||
rc = sendto(sp->fd, buffer, buf_len, 0, peer_address, sizeof(peer_address)); |
||||
if (rc < 0) { |
||||
gpr_log(GPR_ERROR, "Unable to send data: %s", strerror(errno)); |
||||
} |
||||
} |
||||
|
||||
#endif |
||||
@ -0,0 +1,85 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
#ifndef GRPC_INTERNAL_CORE_IOMGR_UDP_SERVER_H |
||||
#define GRPC_INTERNAL_CORE_IOMGR_UDP_SERVER_H |
||||
|
||||
#include "src/core/iomgr/endpoint.h" |
||||
|
||||
/* Forward decl of grpc_udp_server */ |
||||
typedef struct grpc_udp_server grpc_udp_server; |
||||
|
||||
/* New server callback: ep is the newly connected connection */ |
||||
typedef void (*grpc_udp_server_cb)(void *arg, grpc_endpoint *ep); |
||||
|
||||
/* Called when data is available to read from the socket. */ |
||||
typedef void (*grpc_udp_server_read_cb)(int fd, |
||||
grpc_udp_server_cb new_transport_cb, |
||||
void *cb_arg); |
||||
|
||||
/* Create a server, initially not bound to any ports */ |
||||
grpc_udp_server *grpc_udp_server_create(void); |
||||
|
||||
/* Start listening to bound ports */ |
||||
void grpc_udp_server_start(grpc_udp_server *server, grpc_pollset **pollsets, |
||||
size_t pollset_count, grpc_udp_server_cb cb, |
||||
void *cb_arg); |
||||
|
||||
int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned index); |
||||
|
||||
/* Add a port to the server, returning port number on success, or negative
|
||||
on failure. |
||||
|
||||
The :: and 0.0.0.0 wildcard addresses are treated identically, accepting |
||||
both IPv4 and IPv6 connections, but :: is the preferred style. This usually |
||||
creates one socket, but possibly two on systems which support IPv6, |
||||
but not dualstack sockets. */ |
||||
|
||||
/* TODO(ctiller): deprecate this, and make grpc_udp_server_add_ports to handle
|
||||
all of the multiple socket port matching logic in one place */ |
||||
int grpc_udp_server_add_port(grpc_udp_server *s, const void *addr, int addr_len, |
||||
grpc_udp_server_read_cb read_cb); |
||||
|
||||
void grpc_udp_server_destroy(grpc_udp_server *server, |
||||
void (*shutdown_done)(void *shutdown_done_arg), |
||||
void *shutdown_done_arg); |
||||
|
||||
/* Write the contents of buffer to the underlying UDP socket. */ |
||||
/*
|
||||
void grpc_udp_server_write(grpc_udp_server *s, |
||||
const char *buffer, |
||||
int buf_len, |
||||
const struct sockaddr* to); |
||||
*/ |
||||
|
||||
#endif /* GRPC_INTERNAL_CORE_IOMGR_UDP_SERVER_H */ |
||||
@ -1,157 +0,0 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
/* Implementation for gpr_cancellable */ |
||||
|
||||
#include <grpc/support/atm.h> |
||||
#include <grpc/support/sync.h> |
||||
#include <grpc/support/time.h> |
||||
|
||||
void gpr_cancellable_init(gpr_cancellable *c) { |
||||
gpr_mu_init(&c->mu); |
||||
c->cancelled = 0; |
||||
c->waiters.next = &c->waiters; |
||||
c->waiters.prev = &c->waiters; |
||||
c->waiters.mu = NULL; |
||||
c->waiters.cv = NULL; |
||||
} |
||||
|
||||
void gpr_cancellable_destroy(gpr_cancellable *c) { gpr_mu_destroy(&c->mu); } |
||||
|
||||
int gpr_cancellable_is_cancelled(gpr_cancellable *c) { |
||||
return gpr_atm_acq_load(&c->cancelled) != 0; |
||||
} |
||||
|
||||
/* Threads in gpr_cv_cancellable_wait(cv, mu, ..., c) place themselves on a
|
||||
linked list c->waiters of gpr_cancellable_list_ before waiting on their |
||||
condition variables. They check for cancellation while holding *mu. Thus, |
||||
to wake a thread from gpr_cv_cancellable_wait(), it suffices to: |
||||
- set c->cancelled |
||||
- acquire and release *mu |
||||
- gpr_cv_broadcast(cv) |
||||
|
||||
However, gpr_cancellable_cancel() may not use gpr_mu_lock(mu), since the |
||||
caller may already hold *mu---a possible deadlock. (If we knew the caller |
||||
did not hold *mu, care would still be needed, because c->mu follows *mu in |
||||
the locking order, so *mu could not be acquired while holding c->mu---which |
||||
is needed to iterate over c->waiters.) |
||||
|
||||
Therefore, gpr_cancellable_cancel() uses gpr_mu_trylock() rather than |
||||
gpr_mu_lock(), and retries until either gpr_mu_trylock() succeeds or the |
||||
thread leaves gpr_cv_cancellable_wait() for other reasons. In the first |
||||
case, gpr_cancellable_cancel() removes the entry from the waiters list; in |
||||
the second, the waiting thread removes itself from the list. |
||||
|
||||
A one-entry cache of mutexes and condition variables processed is kept to |
||||
avoid doing the same work again and again if many threads are blocked in the |
||||
same place. However, it's important to broadcast on a condition variable if |
||||
the corresponding mutex has been locked successfully, even if the condition |
||||
variable has been signalled before. */ |
||||
|
||||
void gpr_cancellable_cancel(gpr_cancellable *c) { |
||||
if (!gpr_cancellable_is_cancelled(c)) { |
||||
int failures; |
||||
int backoff = 1; |
||||
do { |
||||
struct gpr_cancellable_list_ *l; |
||||
struct gpr_cancellable_list_ *nl; |
||||
gpr_mu *omu = 0; /* one-element cache of a processed gpr_mu */ |
||||
gpr_cv *ocv = 0; /* one-element cache of a processd gpr_cv */ |
||||
gpr_mu_lock(&c->mu); |
||||
gpr_atm_rel_store(&c->cancelled, 1); |
||||
failures = 0; |
||||
for (l = c->waiters.next; l != &c->waiters; l = nl) { |
||||
nl = l->next; |
||||
if (omu != l->mu) { |
||||
omu = l->mu; |
||||
if (gpr_mu_trylock(l->mu)) { |
||||
gpr_mu_unlock(l->mu); |
||||
l->next->prev = l->prev; /* remove *l from list */ |
||||
l->prev->next = l->next; |
||||
/* allow unconditional dequeue in gpr_cv_cancellable_wait() */ |
||||
l->next = l; |
||||
l->prev = l; |
||||
ocv = 0; /* force broadcast */ |
||||
} else { |
||||
failures++; |
||||
} |
||||
} |
||||
if (ocv != l->cv) { |
||||
ocv = l->cv; |
||||
gpr_cv_broadcast(l->cv); |
||||
} |
||||
} |
||||
gpr_mu_unlock(&c->mu); |
||||
if (failures != 0) { |
||||
if (backoff < 10) { |
||||
volatile int i; |
||||
for (i = 0; i != (1 << backoff); i++) { |
||||
} |
||||
backoff++; |
||||
} else { |
||||
gpr_event ev; |
||||
gpr_event_init(&ev); |
||||
gpr_event_wait( |
||||
&ev, gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), |
||||
gpr_time_from_micros(1000, GPR_TIMESPAN))); |
||||
} |
||||
} |
||||
} while (failures != 0); |
||||
} |
||||
} |
||||
|
||||
int gpr_cv_cancellable_wait(gpr_cv *cv, gpr_mu *mu, gpr_timespec abs_deadline, |
||||
gpr_cancellable *c) { |
||||
gpr_int32 timeout; |
||||
gpr_mu_lock(&c->mu); |
||||
timeout = gpr_cancellable_is_cancelled(c); |
||||
if (!timeout) { |
||||
struct gpr_cancellable_list_ le; |
||||
le.mu = mu; |
||||
le.cv = cv; |
||||
le.next = c->waiters.next; |
||||
le.prev = &c->waiters; |
||||
le.next->prev = ≤ |
||||
le.prev->next = ≤ |
||||
gpr_mu_unlock(&c->mu); |
||||
timeout = gpr_cv_wait(cv, mu, abs_deadline); |
||||
gpr_mu_lock(&c->mu); |
||||
le.next->prev = le.prev; |
||||
le.prev->next = le.next; |
||||
if (!timeout) { |
||||
timeout = gpr_cancellable_is_cancelled(c); |
||||
} |
||||
} |
||||
gpr_mu_unlock(&c->mu); |
||||
return timeout; |
||||
} |
||||
@ -0,0 +1,2 @@ |
||||
<%namespace file="../vcxproj_defs.include" import="gen_project"/>\ |
||||
${gen_project('grpc_test_util_unsecure', libs)} |
||||
@ -0,0 +1,43 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
/* This is just a compilation test, to see if we have Zookeeper C client
|
||||
library installed. */ |
||||
|
||||
#include <stdlib.h> |
||||
#include <zookeeper/zookeeper.h> |
||||
|
||||
int main() { |
||||
zookeeper_init(NULL, NULL, 0, 0, 0, 0); |
||||
return 0; |
||||
} |
||||
Some files were not shown because too many files have changed in this diff Show More
Loading…
Reference in new issue