| /* |
| * |
| * 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/lib/surface/channel.h" |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| |
| #include "src/core/ext/client_config/client_channel.h" |
| #include "src/core/lib/iomgr/timer.h" |
| #include "src/core/lib/surface/api_trace.h" |
| #include "src/core/lib/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)); |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_connectivity_state state; |
| GRPC_API_TRACE( |
| "grpc_channel_check_connectivity_state(channel=%p, try_to_connect=%d)", 2, |
| (channel, try_to_connect)); |
| if (client_channel_elem->filter == &grpc_client_channel_filter) { |
| state = grpc_client_channel_check_connectivity_state( |
| &exec_ctx, client_channel_elem, try_to_connect); |
| grpc_exec_ctx_finish(&exec_ctx); |
| return state; |
| } |
| gpr_log(GPR_ERROR, |
| "grpc_channel_check_connectivity_state called on something that is " |
| "not a (u)client channel, but '%s'", |
| client_channel_elem->filter->name); |
| grpc_exec_ctx_finish(&exec_ctx); |
| return GRPC_CHANNEL_SHUTDOWN; |
| } |
| |
| typedef enum { |
| WAITING, |
| CALLING_BACK, |
| CALLING_BACK_AND_FINISHED, |
| CALLED_BACK |
| } callback_phase; |
| |
| typedef struct { |
| gpr_mu mu; |
| callback_phase phase; |
| grpc_closure on_complete; |
| grpc_timer alarm; |
| grpc_connectivity_state state; |
| grpc_completion_queue *cq; |
| grpc_cq_completion completion_storage; |
| grpc_channel *channel; |
| void *tag; |
| } state_watcher; |
| |
| static void delete_state_watcher(grpc_exec_ctx *exec_ctx, state_watcher *w) { |
| grpc_channel_element *client_channel_elem = grpc_channel_stack_last_element( |
| grpc_channel_get_channel_stack(w->channel)); |
| if (client_channel_elem->filter == &grpc_client_channel_filter) { |
| GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, w->channel, |
| "watch_channel_connectivity"); |
| } else { |
| abort(); |
| } |
| gpr_mu_destroy(&w->mu); |
| gpr_free(w); |
| } |
| |
| static void finished_completion(grpc_exec_ctx *exec_ctx, 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_UNREACHABLE_CODE(return ); |
| 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(exec_ctx, w); |
| } |
| } |
| |
| static void partly_done(grpc_exec_ctx *exec_ctx, state_watcher *w, |
| bool due_to_completion, grpc_error *error) { |
| int delete = 0; |
| |
| if (due_to_completion) { |
| grpc_timer_cancel(exec_ctx, &w->alarm); |
| } |
| |
| gpr_mu_lock(&w->mu); |
| |
| if (due_to_completion) { |
| if (grpc_trace_operation_failures) { |
| GRPC_LOG_IF_ERROR("watch_completion_error", GRPC_ERROR_REF(error)); |
| } |
| GRPC_ERROR_UNREF(error); |
| error = GRPC_ERROR_NONE; |
| } else { |
| if (error == GRPC_ERROR_NONE) { |
| error = |
| GRPC_ERROR_CREATE("Timed out waiting for connection state change"); |
| } else if (error == GRPC_ERROR_CANCELLED) { |
| error = GRPC_ERROR_NONE; |
| } |
| } |
| switch (w->phase) { |
| case WAITING: |
| w->phase = CALLING_BACK; |
| grpc_cq_end_op(exec_ctx, w->cq, w->tag, GRPC_ERROR_REF(error), |
| finished_completion, w, &w->completion_storage); |
| break; |
| case CALLING_BACK: |
| w->phase = CALLING_BACK_AND_FINISHED; |
| break; |
| case CALLING_BACK_AND_FINISHED: |
| GPR_UNREACHABLE_CODE(return ); |
| case CALLED_BACK: |
| delete = 1; |
| break; |
| } |
| gpr_mu_unlock(&w->mu); |
| |
| if (delete) { |
| delete_state_watcher(exec_ctx, w); |
| } |
| |
| GRPC_ERROR_UNREF(error); |
| } |
| |
| static void watch_complete(grpc_exec_ctx *exec_ctx, void *pw, |
| grpc_error *error) { |
| partly_done(exec_ctx, pw, true, GRPC_ERROR_REF(error)); |
| } |
| |
| static void timeout_complete(grpc_exec_ctx *exec_ctx, void *pw, |
| grpc_error *error) { |
| partly_done(exec_ctx, pw, false, GRPC_ERROR_REF(error)); |
| } |
| |
| void grpc_channel_watch_connectivity_state( |
| grpc_channel *channel, grpc_connectivity_state last_observed_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)); |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| state_watcher *w = gpr_malloc(sizeof(*w)); |
| |
| GRPC_API_TRACE( |
| "grpc_channel_watch_connectivity_state(" |
| "channel=%p, last_observed_state=%d, " |
| "deadline=gpr_timespec { tv_sec: %lld, tv_nsec: %d, clock_type: %d }, " |
| "cq=%p, tag=%p)", |
| 7, (channel, (int)last_observed_state, (long long)deadline.tv_sec, |
| (int)deadline.tv_nsec, (int)deadline.clock_type, cq, tag)); |
| |
| grpc_cq_begin_op(cq, tag); |
| |
| gpr_mu_init(&w->mu); |
| grpc_closure_init(&w->on_complete, watch_complete, w); |
| w->phase = WAITING; |
| w->state = last_observed_state; |
| w->cq = cq; |
| w->tag = tag; |
| w->channel = channel; |
| |
| grpc_timer_init(&exec_ctx, &w->alarm, |
| gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC), |
| timeout_complete, w, gpr_now(GPR_CLOCK_MONOTONIC)); |
| |
| if (client_channel_elem->filter == &grpc_client_channel_filter) { |
| GRPC_CHANNEL_INTERNAL_REF(channel, "watch_channel_connectivity"); |
| grpc_client_channel_watch_connectivity_state(&exec_ctx, client_channel_elem, |
| grpc_cq_pollset(cq), &w->state, |
| &w->on_complete); |
| } else { |
| abort(); |
| } |
| |
| grpc_exec_ctx_finish(&exec_ctx); |
| } |