| /* |
| * |
| * 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/transport/connectivity_state.h" |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| |
| int grpc_connectivity_state_trace = 0; |
| |
| const char *grpc_connectivity_state_name(grpc_connectivity_state state) { |
| switch (state) { |
| 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) { |
| tracker->current_state = 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("Shutdown connectivity owner"); |
| } |
| grpc_exec_ctx_sched(exec_ctx, w->notify, error, NULL); |
| 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_error **error) { |
| if (grpc_connectivity_state_trace) { |
| gpr_log(GPR_DEBUG, "CONWATCH: %p %s: get %s", tracker, tracker->name, |
| grpc_connectivity_state_name(tracker->current_state)); |
| } |
| if (error != NULL) { |
| *error = GRPC_ERROR_REF(tracker->current_error); |
| } |
| return tracker->current_state; |
| } |
| |
| int grpc_connectivity_state_notify_on_state_change( |
| grpc_exec_ctx *exec_ctx, grpc_connectivity_state_tracker *tracker, |
| grpc_connectivity_state *current, grpc_closure *notify) { |
| if (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(tracker->current_state), notify); |
| } |
| } |
| if (current == NULL) { |
| grpc_connectivity_state_watcher *w = tracker->watchers; |
| if (w != NULL && w->notify == notify) { |
| grpc_exec_ctx_sched(exec_ctx, notify, GRPC_ERROR_CANCELLED, NULL); |
| tracker->watchers = w->next; |
| gpr_free(w); |
| return 0; |
| } |
| while (w != NULL) { |
| grpc_connectivity_state_watcher *rm_candidate = w->next; |
| if (rm_candidate != NULL && rm_candidate->notify == notify) { |
| grpc_exec_ctx_sched(exec_ctx, notify, GRPC_ERROR_CANCELLED, NULL); |
| w->next = w->next->next; |
| gpr_free(rm_candidate); |
| return 0; |
| } |
| w = w->next; |
| } |
| return 0; |
| } else { |
| if (tracker->current_state != *current) { |
| *current = tracker->current_state; |
| grpc_exec_ctx_sched(exec_ctx, notify, |
| GRPC_ERROR_REF(tracker->current_error), NULL); |
| } else { |
| grpc_connectivity_state_watcher *w = gpr_malloc(sizeof(*w)); |
| w->current = current; |
| w->notify = notify; |
| w->next = tracker->watchers; |
| tracker->watchers = w; |
| } |
| return tracker->current_state == 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_watcher *w; |
| if (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(tracker->current_state), |
| grpc_connectivity_state_name(state), reason, error, error_string); |
| grpc_error_free_string(error_string); |
| } |
| switch (state) { |
| 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 (tracker->current_state == state) { |
| return; |
| } |
| GPR_ASSERT(tracker->current_state != GRPC_CHANNEL_SHUTDOWN); |
| tracker->current_state = state; |
| while ((w = tracker->watchers) != NULL) { |
| *w->current = tracker->current_state; |
| tracker->watchers = w->next; |
| grpc_exec_ctx_sched(exec_ctx, w->notify, |
| GRPC_ERROR_REF(tracker->current_error), NULL); |
| gpr_free(w); |
| } |
| } |