--- /dev/null
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/surface/channel.h"
+
+#include <inttypes.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/ext/filters/client_channel/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_core::ApplicationCallbackExecCtx callback_exec_ctx;
+ grpc_core::ExecCtx exec_ctx;
+ grpc_connectivity_state state;
+ GRPC_API_TRACE(
+ "grpc_channel_check_connectivity_state(channel=%p, try_to_connect=%d)", 2,
+ (channel, try_to_connect));
+ if (GPR_LIKELY(client_channel_elem->filter == &grpc_client_channel_filter)) {
+ state = grpc_client_channel_check_connectivity_state(client_channel_elem,
+ try_to_connect);
+
+ return state;
+ }
+ 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_SHUTDOWN;
+}
+
+typedef enum {
+ WAITING,
+ READY_TO_CALL_BACK,
+ CALLING_BACK_AND_FINISHED,
+} callback_phase;
+
+namespace {
+struct state_watcher {
+ gpr_mu mu;
+ callback_phase phase;
+ grpc_closure on_complete;
+ grpc_closure on_timeout;
+ grpc_closure watcher_timer_init;
+ grpc_timer alarm;
+ grpc_connectivity_state state;
+ grpc_completion_queue* cq;
+ grpc_cq_completion completion_storage;
+ grpc_channel* channel;
+ grpc_error* error;
+ void* tag;
+};
+} // namespace
+
+static void delete_state_watcher(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(w->channel, "watch_channel_connectivity");
+ } else {
+ abort();
+ }
+ gpr_mu_destroy(&w->mu);
+ gpr_free(w);
+}
+
+static void finished_completion(void* pw, grpc_cq_completion* ignored) {
+ bool should_delete = false;
+ state_watcher* w = static_cast<state_watcher*>(pw);
+ gpr_mu_lock(&w->mu);
+ switch (w->phase) {
+ case WAITING:
+ case READY_TO_CALL_BACK:
+ GPR_UNREACHABLE_CODE(return );
+ case CALLING_BACK_AND_FINISHED:
+ should_delete = true;
+ break;
+ }
+ gpr_mu_unlock(&w->mu);
+
+ if (should_delete) {
+ delete_state_watcher(w);
+ }
+}
+
+static void partly_done(state_watcher* w, bool due_to_completion,
+ grpc_error* error) {
+ bool end_op = false;
+ void* end_op_tag = nullptr;
+ grpc_error* end_op_error = nullptr;
+ grpc_completion_queue* end_op_cq = nullptr;
+ grpc_cq_completion* end_op_completion_storage = nullptr;
+
+ if (due_to_completion) {
+ grpc_timer_cancel(&w->alarm);
+ } else {
+ grpc_channel_element* client_channel_elem = grpc_channel_stack_last_element(
+ grpc_channel_get_channel_stack(w->channel));
+ grpc_client_channel_watch_connectivity_state(
+ client_channel_elem,
+ grpc_polling_entity_create_from_pollset(grpc_cq_pollset(w->cq)),
+ nullptr, &w->on_complete, nullptr);
+ }
+
+ gpr_mu_lock(&w->mu);
+
+ if (due_to_completion) {
+ if (GRPC_TRACE_FLAG_ENABLED(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_FROM_STATIC_STRING(
+ "Timed out waiting for connection state change");
+ } else if (error == GRPC_ERROR_CANCELLED) {
+ error = GRPC_ERROR_NONE;
+ }
+ }
+ switch (w->phase) {
+ case WAITING:
+ GRPC_ERROR_REF(error);
+ w->error = error;
+ w->phase = READY_TO_CALL_BACK;
+ break;
+ case READY_TO_CALL_BACK:
+ if (error != GRPC_ERROR_NONE) {
+ GPR_ASSERT(!due_to_completion);
+ GRPC_ERROR_UNREF(w->error);
+ GRPC_ERROR_REF(error);
+ w->error = error;
+ }
+ w->phase = CALLING_BACK_AND_FINISHED;
+ end_op = true;
+ end_op_cq = w->cq;
+ end_op_tag = w->tag;
+ end_op_error = w->error;
+ end_op_completion_storage = &w->completion_storage;
+ break;
+ case CALLING_BACK_AND_FINISHED:
+ GPR_UNREACHABLE_CODE(return );
+ break;
+ }
+ gpr_mu_unlock(&w->mu);
+
+ if (end_op) {
+ grpc_cq_end_op(end_op_cq, end_op_tag, end_op_error, finished_completion, w,
+ end_op_completion_storage);
+ }
+
+ GRPC_ERROR_UNREF(error);
+}
+
+static void watch_complete(void* pw, grpc_error* error) {
+ partly_done(static_cast<state_watcher*>(pw), true, GRPC_ERROR_REF(error));
+}
+
+static void timeout_complete(void* pw, grpc_error* error) {
+ partly_done(static_cast<state_watcher*>(pw), false, GRPC_ERROR_REF(error));
+}
+
+int grpc_channel_num_external_connectivity_watchers(grpc_channel* channel) {
+ grpc_channel_element* client_channel_elem =
+ grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
+ return grpc_client_channel_num_external_connectivity_watchers(
+ client_channel_elem);
+}
+
+typedef struct watcher_timer_init_arg {
+ state_watcher* w;
+ gpr_timespec deadline;
+} watcher_timer_init_arg;
+
+static void watcher_timer_init(void* arg, grpc_error* error_ignored) {
+ watcher_timer_init_arg* wa = static_cast<watcher_timer_init_arg*>(arg);
+
+ grpc_timer_init(&wa->w->alarm, grpc_timespec_to_millis_round_up(wa->deadline),
+ &wa->w->on_timeout);
+ gpr_free(wa);
+}
+
+int grpc_channel_support_connectivity_watcher(grpc_channel* channel) {
+ grpc_channel_element* client_channel_elem =
+ grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
+ return client_channel_elem->filter != &grpc_client_channel_filter ? 0 : 1;
+}
+
+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_core::ApplicationCallbackExecCtx callback_exec_ctx;
+ grpc_core::ExecCtx exec_ctx;
+ state_watcher* w = static_cast<state_watcher*>(gpr_malloc(sizeof(*w)));
+
+ GRPC_API_TRACE(
+ "grpc_channel_watch_connectivity_state("
+ "channel=%p, last_observed_state=%d, "
+ "deadline=gpr_timespec { tv_sec: %" PRId64
+ ", tv_nsec: %d, clock_type: %d }, "
+ "cq=%p, tag=%p)",
+ 7,
+ (channel, (int)last_observed_state, deadline.tv_sec, deadline.tv_nsec,
+ (int)deadline.clock_type, cq, tag));
+
+ GPR_ASSERT(grpc_cq_begin_op(cq, tag));
+
+ gpr_mu_init(&w->mu);
+ GRPC_CLOSURE_INIT(&w->on_complete, watch_complete, w,
+ grpc_schedule_on_exec_ctx);
+ GRPC_CLOSURE_INIT(&w->on_timeout, timeout_complete, w,
+ grpc_schedule_on_exec_ctx);
+ w->phase = WAITING;
+ w->state = last_observed_state;
+ w->cq = cq;
+ w->tag = tag;
+ w->channel = channel;
+ w->error = nullptr;
+
+ watcher_timer_init_arg* wa = static_cast<watcher_timer_init_arg*>(
+ gpr_malloc(sizeof(watcher_timer_init_arg)));
+ wa->w = w;
+ wa->deadline = deadline;
+ GRPC_CLOSURE_INIT(&w->watcher_timer_init, watcher_timer_init, wa,
+ grpc_schedule_on_exec_ctx);
+
+ if (client_channel_elem->filter == &grpc_client_channel_filter) {
+ GRPC_CHANNEL_INTERNAL_REF(channel, "watch_channel_connectivity");
+ grpc_client_channel_watch_connectivity_state(
+ client_channel_elem,
+ grpc_polling_entity_create_from_pollset(grpc_cq_pollset(cq)), &w->state,
+ &w->on_complete, &w->watcher_timer_init);
+ } else {
+ abort();
+ }
+}
git://repos.xcallymotion.com / motion2.git / blobdiff