mirror of https://github.com/grpc/grpc.git
Initial plumbing work; needs tests and more client_channel implementation.pull/2477/head
Craig Tiller
10 years ago
parent
3e5d61670e
commit
48cb07c909
17 changed files with 304 additions and 9 deletions
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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/surface/channel.h" |
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#include <grpc/support/alloc.h> |
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#include <grpc/support/log.h> |
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#include "src/core/channel/client_channel.h" |
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#include "src/core/iomgr/alarm.h" |
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#include "src/core/surface/completion_queue.h" |
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grpc_connectivity_state grpc_channel_check_connectivity_state( |
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grpc_channel *channel, int try_to_connect) { |
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/* forward through to the underlying client channel */ |
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grpc_channel_element *client_channel_elem = |
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grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel)); |
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if (client_channel_elem->filter != &grpc_client_channel_filter) { |
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gpr_log(GPR_ERROR, |
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"grpc_channel_check_connectivity_state called on something that is " |
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"not a client channel, but '%s'", |
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client_channel_elem->filter->name); |
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return GRPC_CHANNEL_FATAL_FAILURE; |
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} |
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return grpc_client_channel_check_connectivity_state(client_channel_elem, |
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try_to_connect); |
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} |
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typedef enum { |
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WAITING, |
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CALLING_BACK, |
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CALLING_BACK_AND_FINISHED, |
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CALLED_BACK |
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} callback_phase; |
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typedef struct { |
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gpr_mu mu; |
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callback_phase phase; |
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int success; |
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grpc_iomgr_closure on_complete; |
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grpc_alarm alarm; |
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grpc_connectivity_state state; |
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grpc_connectivity_state *optional_new_state; |
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grpc_completion_queue *cq; |
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grpc_cq_completion completion_storage; |
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void *tag; |
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} state_watcher; |
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static void delete_state_watcher(state_watcher *w) { |
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gpr_mu_destroy(&w->mu); |
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gpr_free(w); |
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} |
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static void finished_completion(void *pw, grpc_cq_completion *ignored) { |
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int delete = 0; |
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state_watcher *w = pw; |
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gpr_mu_lock(&w->mu); |
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switch (w->phase) { |
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case WAITING: |
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case CALLED_BACK: |
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gpr_log(GPR_ERROR, "should never reach here"); |
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abort(); |
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break; |
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case CALLING_BACK: |
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w->phase = CALLED_BACK; |
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break; |
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case CALLING_BACK_AND_FINISHED: |
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delete = 1; |
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break; |
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} |
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gpr_mu_unlock(&w->mu); |
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if (delete) { |
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delete_state_watcher(w); |
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} |
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} |
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static void partly_done(state_watcher *w, int due_to_completion) { |
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int delete = 0; |
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if (due_to_completion) { |
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gpr_mu_lock(&w->mu); |
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w->success = 1; |
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gpr_mu_unlock(&w->mu); |
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grpc_alarm_cancel(&w->alarm); |
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} |
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gpr_mu_lock(&w->mu); |
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switch (w->phase) { |
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case WAITING: |
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w->phase = CALLING_BACK; |
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if (w->optional_new_state) { |
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*w->optional_new_state = w->state; |
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} |
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grpc_cq_end_op(w->cq, w->tag, w->success, finished_completion, w, |
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&w->completion_storage); |
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break; |
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case CALLING_BACK: |
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w->phase = CALLING_BACK_AND_FINISHED; |
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break; |
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case CALLING_BACK_AND_FINISHED: |
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gpr_log(GPR_ERROR, "should never reach here"); |
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abort(); |
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break; |
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case CALLED_BACK: |
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delete = 1; |
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break; |
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} |
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gpr_mu_unlock(&w->mu); |
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if (delete) { |
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delete_state_watcher(w); |
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} |
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} |
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static void watch_complete(void *pw, int success) { partly_done(pw, 0); } |
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static void timeout_complete(void *pw, int success) { partly_done(pw, 1); } |
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void grpc_channel_watch_connectivity_state( |
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grpc_channel *channel, grpc_connectivity_state last_observed_state, |
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grpc_connectivity_state *optional_new_state, gpr_timespec deadline, |
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grpc_completion_queue *cq, void *tag) { |
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grpc_channel_element *client_channel_elem = |
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grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel)); |
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state_watcher *w = gpr_malloc(sizeof(*w)); |
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grpc_cq_begin_op(cq); |
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gpr_mu_init(&w->mu); |
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grpc_iomgr_closure_init(&w->on_complete, watch_complete, w); |
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w->phase = WAITING; |
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w->state = last_observed_state; |
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w->success = 0; |
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w->optional_new_state = optional_new_state; |
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w->cq = cq; |
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w->tag = tag; |
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grpc_alarm_init(&w->alarm, deadline, timeout_complete, w, |
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gpr_now(GPR_CLOCK_REALTIME)); |
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if (client_channel_elem->filter != &grpc_client_channel_filter) { |
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gpr_log(GPR_ERROR, |
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"grpc_channel_watch_connectivity_state called on something that is " |
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"not a client channel, but '%s'", |
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client_channel_elem->filter->name); |
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grpc_iomgr_add_delayed_callback(&w->on_complete, 1); |
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} else { |
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grpc_client_channel_watch_connectivity_state(client_channel_elem, &w->state, |
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&w->on_complete); |
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} |
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} |
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