| /* |
| * |
| * 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/transport/connectivity_state.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_FATAL_FAILURE: return "FATAL_FAILURE"; |
| } |
| abort(); |
| 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->watchers = NULL; |
| tracker->name = gpr_strdup(name); |
| } |
| |
| void grpc_connectivity_state_destroy(grpc_connectivity_state_tracker *tracker) { |
| grpc_connectivity_state_watcher *w; |
| while ((w = tracker->watchers)) { |
| tracker->watchers = w->next; |
| |
| if (GRPC_CHANNEL_FATAL_FAILURE != *w->current) { |
| *w->current = GRPC_CHANNEL_FATAL_FAILURE; |
| grpc_iomgr_add_callback(w->notify); |
| } else { |
| grpc_iomgr_add_delayed_callback(w->notify, 0); |
| } |
| gpr_free(w); |
| } |
| gpr_free(tracker->name); |
| } |
| |
| grpc_connectivity_state grpc_connectivity_state_check( |
| grpc_connectivity_state_tracker *tracker) { |
| return tracker->current_state; |
| } |
| |
| int grpc_connectivity_state_notify_on_state_change( |
| grpc_connectivity_state_tracker *tracker, grpc_connectivity_state *current, |
| grpc_iomgr_closure *notify) { |
| if (grpc_connectivity_state_trace) { |
| gpr_log(GPR_DEBUG, "CONWATCH: %s: from %s [cur=%s]", tracker->name, grpc_connectivity_state_name(*current), grpc_connectivity_state_name(tracker->current_state)); |
| } |
| if (tracker->current_state != *current) { |
| *current = tracker->current_state; |
| grpc_iomgr_add_callback(notify); |
| } 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_with_scheduler( |
| grpc_connectivity_state_tracker *tracker, grpc_connectivity_state state, |
| void (*scheduler)(void *arg, grpc_iomgr_closure *closure), void *arg) { |
| grpc_connectivity_state_watcher *new = NULL; |
| grpc_connectivity_state_watcher *w; |
| if (grpc_connectivity_state_trace) { |
| gpr_log(GPR_DEBUG, "SET: %s: %s --> %s", tracker->name, grpc_connectivity_state_name(tracker->current_state), grpc_connectivity_state_name(state)); |
| } |
| if (tracker->current_state == state) { |
| return; |
| } |
| tracker->current_state = state; |
| while ((w = tracker->watchers)) { |
| tracker->watchers = w->next; |
| |
| if (state != *w->current) { |
| *w->current = state; |
| scheduler(arg, w->notify); |
| gpr_free(w); |
| } else { |
| w->next = new; |
| new = w; |
| } |
| } |
| tracker->watchers = new; |
| } |
| |
| static void default_scheduler(void *ignored, grpc_iomgr_closure *closure) { |
| grpc_iomgr_add_callback(closure); |
| } |
| |
| void grpc_connectivity_state_set(grpc_connectivity_state_tracker *tracker, |
| grpc_connectivity_state state) { |
| grpc_connectivity_state_set_with_scheduler(tracker, state, default_scheduler, |
| NULL); |
| } |