| /* |
| * |
| * 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. |
| * |
| */ |
| |
| #include "src/core/surface/channel.h" |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| |
| #include "src/core/channel/client_channel.h" |
| #include "src/core/iomgr/alarm.h" |
| #include "src/core/surface/completion_queue.h" |
| |
| grpc_connectivity_state grpc_channel_check_connectivity_state( |
| grpc_channel *channel, int try_to_connect) { |
| /* forward through to the underlying client channel */ |
| grpc_channel_element *client_channel_elem = |
| grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel)); |
| if (client_channel_elem->filter != &grpc_client_channel_filter) { |
| gpr_log(GPR_ERROR, |
| "grpc_channel_check_connectivity_state called on something that is " |
| "not a client channel, but '%s'", |
| client_channel_elem->filter->name); |
| return GRPC_CHANNEL_FATAL_FAILURE; |
| } |
| return grpc_client_channel_check_connectivity_state(client_channel_elem, |
| try_to_connect); |
| } |
| |
| typedef enum { |
| WAITING, |
| CALLING_BACK, |
| CALLING_BACK_AND_FINISHED, |
| CALLED_BACK |
| } callback_phase; |
| |
| typedef struct { |
| gpr_mu mu; |
| callback_phase phase; |
| int success; |
| grpc_iomgr_closure on_complete; |
| grpc_alarm alarm; |
| grpc_connectivity_state state; |
| grpc_connectivity_state *optional_new_state; |
| grpc_completion_queue *cq; |
| grpc_cq_completion completion_storage; |
| void *tag; |
| } state_watcher; |
| |
| static void delete_state_watcher(state_watcher *w) { |
| gpr_mu_destroy(&w->mu); |
| gpr_free(w); |
| } |
| |
| static void finished_completion(void *pw, grpc_cq_completion *ignored) { |
| int delete = 0; |
| state_watcher *w = pw; |
| gpr_mu_lock(&w->mu); |
| switch (w->phase) { |
| case WAITING: |
| case CALLED_BACK: |
| gpr_log(GPR_ERROR, "should never reach here"); |
| abort(); |
| break; |
| case CALLING_BACK: |
| w->phase = CALLED_BACK; |
| break; |
| case CALLING_BACK_AND_FINISHED: |
| delete = 1; |
| break; |
| } |
| gpr_mu_unlock(&w->mu); |
| |
| if (delete) { |
| delete_state_watcher(w); |
| } |
| } |
| |
| static void partly_done(state_watcher *w, int due_to_completion) { |
| int delete = 0; |
| |
| if (due_to_completion) { |
| gpr_mu_lock(&w->mu); |
| w->success = 1; |
| gpr_mu_unlock(&w->mu); |
| grpc_alarm_cancel(&w->alarm); |
| } |
| |
| gpr_mu_lock(&w->mu); |
| switch (w->phase) { |
| case WAITING: |
| w->phase = CALLING_BACK; |
| if (w->optional_new_state) { |
| *w->optional_new_state = w->state; |
| } |
| grpc_cq_end_op(w->cq, w->tag, w->success, finished_completion, w, |
| &w->completion_storage); |
| break; |
| case CALLING_BACK: |
| w->phase = CALLING_BACK_AND_FINISHED; |
| break; |
| case CALLING_BACK_AND_FINISHED: |
| gpr_log(GPR_ERROR, "should never reach here"); |
| abort(); |
| break; |
| case CALLED_BACK: |
| delete = 1; |
| break; |
| } |
| gpr_mu_unlock(&w->mu); |
| |
| if (delete) { |
| delete_state_watcher(w); |
| } |
| } |
| |
| static void watch_complete(void *pw, int success) { partly_done(pw, 0); } |
| |
| static void timeout_complete(void *pw, int success) { partly_done(pw, 1); } |
| |
| void grpc_channel_watch_connectivity_state( |
| grpc_channel *channel, grpc_connectivity_state last_observed_state, |
| grpc_connectivity_state *optional_new_state, gpr_timespec deadline, |
| grpc_completion_queue *cq, void *tag) { |
| grpc_channel_element *client_channel_elem = |
| grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel)); |
| state_watcher *w = gpr_malloc(sizeof(*w)); |
| |
| grpc_cq_begin_op(cq); |
| |
| gpr_mu_init(&w->mu); |
| grpc_iomgr_closure_init(&w->on_complete, watch_complete, w); |
| w->phase = WAITING; |
| w->state = last_observed_state; |
| w->success = 0; |
| w->optional_new_state = optional_new_state; |
| w->cq = cq; |
| w->tag = tag; |
| |
| grpc_alarm_init(&w->alarm, deadline, timeout_complete, w, |
| gpr_now(GPR_CLOCK_REALTIME)); |
| |
| if (client_channel_elem->filter != &grpc_client_channel_filter) { |
| gpr_log(GPR_ERROR, |
| "grpc_channel_watch_connectivity_state called on something that is " |
| "not a client channel, but '%s'", |
| client_channel_elem->filter->name); |
| grpc_iomgr_add_delayed_callback(&w->on_complete, 1); |
| } else { |
| grpc_client_channel_watch_connectivity_state(client_channel_elem, &w->state, |
| &w->on_complete); |
| } |
| } |