| /* |
| * |
| * 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 "src/core/lib/transport/connectivity_state.h" |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| |
| grpc_tracer_flag grpc_connectivity_state_trace = |
| GRPC_TRACER_INITIALIZER(false, "connectivity_state"); |
| |
| const char *grpc_connectivity_state_name(grpc_connectivity_state state) { |
| switch (state) { |
| case GRPC_CHANNEL_INIT: |
| return "INIT"; |
| case GRPC_CHANNEL_IDLE: |
| return "IDLE"; |
| case GRPC_CHANNEL_CONNECTING: |
| return "CONNECTING"; |
| case GRPC_CHANNEL_READY: |
| return "READY"; |
| case GRPC_CHANNEL_TRANSIENT_FAILURE: |
| return "TRANSIENT_FAILURE"; |
| case GRPC_CHANNEL_SHUTDOWN: |
| return "SHUTDOWN"; |
| } |
| GPR_UNREACHABLE_CODE(return "UNKNOWN"); |
| } |
| |
| void grpc_connectivity_state_init(grpc_connectivity_state_tracker *tracker, |
| grpc_connectivity_state init_state, |
| const char *name) { |
| gpr_atm_no_barrier_store(&tracker->current_state_atm, init_state); |
| tracker->current_error = GRPC_ERROR_NONE; |
| tracker->watchers = NULL; |
| tracker->name = gpr_strdup(name); |
| } |
| |
| void grpc_connectivity_state_destroy(grpc_exec_ctx *exec_ctx, |
| grpc_connectivity_state_tracker *tracker) { |
| grpc_error *error; |
| grpc_connectivity_state_watcher *w; |
| while ((w = tracker->watchers)) { |
| tracker->watchers = w->next; |
| |
| if (GRPC_CHANNEL_SHUTDOWN != *w->current) { |
| *w->current = GRPC_CHANNEL_SHUTDOWN; |
| error = GRPC_ERROR_NONE; |
| } else { |
| error = |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING("Shutdown connectivity owner"); |
| } |
| GRPC_CLOSURE_SCHED(exec_ctx, w->notify, error); |
| gpr_free(w); |
| } |
| GRPC_ERROR_UNREF(tracker->current_error); |
| gpr_free(tracker->name); |
| } |
| |
| grpc_connectivity_state grpc_connectivity_state_check( |
| grpc_connectivity_state_tracker *tracker) { |
| grpc_connectivity_state cur = |
| (grpc_connectivity_state)gpr_atm_no_barrier_load( |
| &tracker->current_state_atm); |
| if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) { |
| gpr_log(GPR_DEBUG, "CONWATCH: %p %s: get %s", tracker, tracker->name, |
| grpc_connectivity_state_name(cur)); |
| } |
| return cur; |
| } |
| |
| grpc_connectivity_state grpc_connectivity_state_get( |
| grpc_connectivity_state_tracker *tracker, grpc_error **error) { |
| grpc_connectivity_state cur = |
| (grpc_connectivity_state)gpr_atm_no_barrier_load( |
| &tracker->current_state_atm); |
| if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) { |
| gpr_log(GPR_DEBUG, "CONWATCH: %p %s: get %s", tracker, tracker->name, |
| grpc_connectivity_state_name(cur)); |
| } |
| if (error != NULL) { |
| *error = GRPC_ERROR_REF(tracker->current_error); |
| } |
| return cur; |
| } |
| |
| bool grpc_connectivity_state_has_watchers( |
| grpc_connectivity_state_tracker *connectivity_state) { |
| return connectivity_state->watchers != NULL; |
| } |
| |
| bool grpc_connectivity_state_notify_on_state_change( |
| grpc_exec_ctx *exec_ctx, grpc_connectivity_state_tracker *tracker, |
| grpc_connectivity_state *current, grpc_closure *notify) { |
| grpc_connectivity_state cur = |
| (grpc_connectivity_state)gpr_atm_no_barrier_load( |
| &tracker->current_state_atm); |
| if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) { |
| if (current == NULL) { |
| gpr_log(GPR_DEBUG, "CONWATCH: %p %s: unsubscribe notify=%p", tracker, |
| tracker->name, notify); |
| } else { |
| gpr_log(GPR_DEBUG, "CONWATCH: %p %s: from %s [cur=%s] notify=%p", tracker, |
| tracker->name, grpc_connectivity_state_name(*current), |
| grpc_connectivity_state_name(cur), notify); |
| } |
| } |
| if (current == NULL) { |
| grpc_connectivity_state_watcher *w = tracker->watchers; |
| if (w != NULL && w->notify == notify) { |
| GRPC_CLOSURE_SCHED(exec_ctx, notify, GRPC_ERROR_CANCELLED); |
| tracker->watchers = w->next; |
| gpr_free(w); |
| return false; |
| } |
| while (w != NULL) { |
| grpc_connectivity_state_watcher *rm_candidate = w->next; |
| if (rm_candidate != NULL && rm_candidate->notify == notify) { |
| GRPC_CLOSURE_SCHED(exec_ctx, notify, GRPC_ERROR_CANCELLED); |
| w->next = w->next->next; |
| gpr_free(rm_candidate); |
| return false; |
| } |
| w = w->next; |
| } |
| return false; |
| } else { |
| if (cur != *current) { |
| *current = cur; |
| GRPC_CLOSURE_SCHED(exec_ctx, notify, |
| GRPC_ERROR_REF(tracker->current_error)); |
| } else { |
| grpc_connectivity_state_watcher *w = |
| (grpc_connectivity_state_watcher *)gpr_malloc(sizeof(*w)); |
| w->current = current; |
| w->notify = notify; |
| w->next = tracker->watchers; |
| tracker->watchers = w; |
| } |
| return cur == GRPC_CHANNEL_IDLE; |
| } |
| } |
| |
| void grpc_connectivity_state_set(grpc_exec_ctx *exec_ctx, |
| grpc_connectivity_state_tracker *tracker, |
| grpc_connectivity_state state, |
| grpc_error *error, const char *reason) { |
| grpc_connectivity_state cur = |
| (grpc_connectivity_state)gpr_atm_no_barrier_load( |
| &tracker->current_state_atm); |
| grpc_connectivity_state_watcher *w; |
| if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) { |
| const char *error_string = grpc_error_string(error); |
| gpr_log(GPR_DEBUG, "SET: %p %s: %s --> %s [%s] error=%p %s", tracker, |
| tracker->name, grpc_connectivity_state_name(cur), |
| grpc_connectivity_state_name(state), reason, error, error_string); |
| } |
| switch (state) { |
| case GRPC_CHANNEL_INIT: |
| case GRPC_CHANNEL_CONNECTING: |
| case GRPC_CHANNEL_IDLE: |
| case GRPC_CHANNEL_READY: |
| GPR_ASSERT(error == GRPC_ERROR_NONE); |
| break; |
| case GRPC_CHANNEL_SHUTDOWN: |
| case GRPC_CHANNEL_TRANSIENT_FAILURE: |
| GPR_ASSERT(error != GRPC_ERROR_NONE); |
| break; |
| } |
| GRPC_ERROR_UNREF(tracker->current_error); |
| tracker->current_error = error; |
| if (cur == state) { |
| return; |
| } |
| GPR_ASSERT(cur != GRPC_CHANNEL_SHUTDOWN); |
| gpr_atm_no_barrier_store(&tracker->current_state_atm, state); |
| while ((w = tracker->watchers) != NULL) { |
| *w->current = state; |
| tracker->watchers = w->next; |
| if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) { |
| gpr_log(GPR_DEBUG, "NOTIFY: %p %s: %p", tracker, tracker->name, |
| w->notify); |
| } |
| GRPC_CLOSURE_SCHED(exec_ctx, w->notify, |
| GRPC_ERROR_REF(tracker->current_error)); |
| gpr_free(w); |
| } |
| } |