The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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235 lines
8.3 KiB
235 lines
8.3 KiB
/* |
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* |
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* Copyright 2015-2016, 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 <grpc/grpc.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <grpc/support/alloc.h> |
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#include <grpc/support/slice.h> |
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#include <grpc/support/slice_buffer.h> |
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#include "src/core/census/grpc_filter.h" |
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#include "src/core/channel/channel_args.h" |
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#include "src/core/channel/client_channel.h" |
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#include "src/core/channel/compress_filter.h" |
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#include "src/core/channel/http_client_filter.h" |
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#include "src/core/client_config/resolver_registry.h" |
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#include "src/core/iomgr/tcp_client.h" |
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#include "src/core/surface/api_trace.h" |
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#include "src/core/surface/channel.h" |
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#include "src/core/transport/chttp2_transport.h" |
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typedef struct { |
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grpc_connector base; |
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gpr_refcount refs; |
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grpc_closure *notify; |
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grpc_connect_in_args args; |
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grpc_connect_out_args *result; |
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grpc_closure initial_string_sent; |
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gpr_slice_buffer initial_string_buffer; |
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grpc_endpoint *tcp; |
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grpc_closure connected; |
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} connector; |
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static void connector_ref(grpc_connector *con) { |
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connector *c = (connector *)con; |
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gpr_ref(&c->refs); |
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} |
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static void connector_unref(grpc_exec_ctx *exec_ctx, grpc_connector *con) { |
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connector *c = (connector *)con; |
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if (gpr_unref(&c->refs)) { |
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/* c->initial_string_buffer does not need to be destroyed */ |
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gpr_free(c); |
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} |
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} |
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static void on_initial_connect_string_sent(grpc_exec_ctx *exec_ctx, void *arg, |
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bool success) { |
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connector_unref(exec_ctx, arg); |
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} |
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static void connected(grpc_exec_ctx *exec_ctx, void *arg, bool success) { |
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connector *c = arg; |
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grpc_closure *notify; |
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grpc_endpoint *tcp = c->tcp; |
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if (tcp != NULL) { |
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if (!GPR_SLICE_IS_EMPTY(c->args.initial_connect_string)) { |
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grpc_closure_init(&c->initial_string_sent, on_initial_connect_string_sent, |
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c); |
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gpr_slice_buffer_init(&c->initial_string_buffer); |
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gpr_slice_buffer_add(&c->initial_string_buffer, |
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c->args.initial_connect_string); |
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connector_ref(arg); |
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grpc_endpoint_write(exec_ctx, tcp, &c->initial_string_buffer, |
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&c->initial_string_sent); |
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} |
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c->result->transport = |
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grpc_create_chttp2_transport(exec_ctx, c->args.channel_args, tcp, 1); |
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grpc_chttp2_transport_start_reading(exec_ctx, c->result->transport, NULL, |
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0); |
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GPR_ASSERT(c->result->transport); |
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c->result->channel_args = c->args.channel_args; |
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c->result->filters = gpr_malloc(sizeof(grpc_channel_filter *)); |
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c->result->filters[0] = &grpc_http_client_filter; |
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c->result->num_filters = 1; |
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} else { |
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memset(c->result, 0, sizeof(*c->result)); |
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} |
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notify = c->notify; |
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c->notify = NULL; |
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notify->cb(exec_ctx, notify->cb_arg, 1); |
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} |
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static void connector_shutdown(grpc_exec_ctx *exec_ctx, grpc_connector *con) {} |
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static void connector_connect(grpc_exec_ctx *exec_ctx, grpc_connector *con, |
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const grpc_connect_in_args *args, |
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grpc_connect_out_args *result, |
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grpc_closure *notify) { |
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connector *c = (connector *)con; |
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GPR_ASSERT(c->notify == NULL); |
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GPR_ASSERT(notify->cb); |
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c->notify = notify; |
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c->args = *args; |
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c->result = result; |
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c->tcp = NULL; |
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grpc_closure_init(&c->connected, connected, c); |
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grpc_tcp_client_connect(exec_ctx, &c->connected, &c->tcp, |
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args->interested_parties, args->addr, args->addr_len, |
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args->deadline); |
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} |
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static const grpc_connector_vtable connector_vtable = { |
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connector_ref, connector_unref, connector_shutdown, connector_connect}; |
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typedef struct { |
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grpc_subchannel_factory base; |
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gpr_refcount refs; |
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grpc_channel_args *merge_args; |
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grpc_channel *master; |
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} subchannel_factory; |
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static void subchannel_factory_ref(grpc_subchannel_factory *scf) { |
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subchannel_factory *f = (subchannel_factory *)scf; |
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gpr_ref(&f->refs); |
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} |
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static void subchannel_factory_unref(grpc_exec_ctx *exec_ctx, |
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grpc_subchannel_factory *scf) { |
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subchannel_factory *f = (subchannel_factory *)scf; |
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if (gpr_unref(&f->refs)) { |
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GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, f->master, "subchannel_factory"); |
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grpc_channel_args_destroy(f->merge_args); |
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gpr_free(f); |
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} |
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} |
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static grpc_subchannel *subchannel_factory_create_subchannel( |
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grpc_exec_ctx *exec_ctx, grpc_subchannel_factory *scf, |
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grpc_subchannel_args *args) { |
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subchannel_factory *f = (subchannel_factory *)scf; |
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connector *c = gpr_malloc(sizeof(*c)); |
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grpc_channel_args *final_args = |
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grpc_channel_args_merge(args->args, f->merge_args); |
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grpc_subchannel *s; |
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memset(c, 0, sizeof(*c)); |
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c->base.vtable = &connector_vtable; |
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gpr_ref_init(&c->refs, 1); |
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args->args = final_args; |
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s = grpc_subchannel_create(exec_ctx, &c->base, args); |
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grpc_connector_unref(exec_ctx, &c->base); |
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grpc_channel_args_destroy(final_args); |
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return s; |
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} |
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static const grpc_subchannel_factory_vtable subchannel_factory_vtable = { |
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subchannel_factory_ref, subchannel_factory_unref, |
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subchannel_factory_create_subchannel}; |
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/* Create a client channel: |
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Asynchronously: - resolve target |
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- connect to it (trying alternatives as presented) |
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- perform handshakes */ |
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grpc_channel *grpc_insecure_channel_create(const char *target, |
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const grpc_channel_args *args, |
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void *reserved) { |
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grpc_channel *channel = NULL; |
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#define MAX_FILTERS 3 |
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const grpc_channel_filter *filters[MAX_FILTERS]; |
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grpc_resolver *resolver; |
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subchannel_factory *f; |
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grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
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size_t n = 0; |
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GRPC_API_TRACE( |
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"grpc_insecure_channel_create(target=%p, args=%p, reserved=%p)", 3, |
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(target, args, reserved)); |
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GPR_ASSERT(!reserved); |
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if (grpc_channel_args_is_census_enabled(args)) { |
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filters[n++] = &grpc_client_census_filter; |
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} |
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filters[n++] = &grpc_compress_filter; |
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filters[n++] = &grpc_client_channel_filter; |
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GPR_ASSERT(n <= MAX_FILTERS); |
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channel = |
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grpc_channel_create_from_filters(&exec_ctx, target, filters, n, args, 1); |
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f = gpr_malloc(sizeof(*f)); |
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f->base.vtable = &subchannel_factory_vtable; |
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gpr_ref_init(&f->refs, 1); |
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f->merge_args = grpc_channel_args_copy(args); |
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f->master = channel; |
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GRPC_CHANNEL_INTERNAL_REF(f->master, "subchannel_factory"); |
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resolver = grpc_resolver_create(target, &f->base); |
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if (!resolver) { |
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GRPC_CHANNEL_INTERNAL_UNREF(&exec_ctx, f->master, "subchannel_factory"); |
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grpc_subchannel_factory_unref(&exec_ctx, &f->base); |
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grpc_exec_ctx_finish(&exec_ctx); |
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return NULL; |
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} |
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grpc_client_channel_set_resolver( |
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&exec_ctx, grpc_channel_get_channel_stack(channel), resolver); |
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GRPC_RESOLVER_UNREF(&exec_ctx, resolver, "create"); |
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grpc_subchannel_factory_unref(&exec_ctx, &f->base); |
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grpc_exec_ctx_finish(&exec_ctx); |
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return channel; |
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}
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