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+/*
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+ *
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+ * Copyright 2015, Google Inc.
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are
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+ * met:
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+ *
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * * Redistributions in binary form must reproduce the above
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+ * copyright notice, this list of conditions and the following disclaimer
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+ * in the documentation and/or other materials provided with the
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+ * distribution.
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+ * * Neither the name of Google Inc. nor the names of its
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+ * contributors may be used to endorse or promote products derived from
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+ * this software without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ *
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+ */
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+
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+#include "src/core/surface/channel.h"
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+
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+#include <grpc/support/alloc.h>
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+#include <grpc/support/log.h>
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+
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+#include "src/core/channel/client_channel.h"
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+#include "src/core/iomgr/alarm.h"
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+#include "src/core/surface/completion_queue.h"
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+
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+grpc_connectivity_state grpc_channel_check_connectivity_state(
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+ grpc_channel *channel, int try_to_connect) {
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+ /* forward through to the underlying client channel */
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+ grpc_channel_element *client_channel_elem =
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+ grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
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+ if (client_channel_elem->filter != &grpc_client_channel_filter) {
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+ gpr_log(GPR_ERROR,
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+ "grpc_channel_check_connectivity_state called on something that is "
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+ "not a client channel, but '%s'",
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+ client_channel_elem->filter->name);
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+ return GRPC_CHANNEL_FATAL_FAILURE;
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+ }
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+ return grpc_client_channel_check_connectivity_state(client_channel_elem,
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+ try_to_connect);
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+}
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+
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+typedef enum {
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+ WAITING,
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+ CALLING_BACK,
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+ CALLING_BACK_AND_FINISHED,
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+ CALLED_BACK
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+} callback_phase;
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+
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+typedef struct {
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+ gpr_mu mu;
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+ callback_phase phase;
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+ int success;
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+ grpc_iomgr_closure on_complete;
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+ grpc_alarm alarm;
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+ grpc_connectivity_state state;
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+ grpc_connectivity_state *optional_new_state;
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+ grpc_completion_queue *cq;
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+ grpc_cq_completion completion_storage;
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+ void *tag;
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+} state_watcher;
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+
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+static void delete_state_watcher(state_watcher *w) {
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+ gpr_mu_destroy(&w->mu);
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+ gpr_free(w);
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+}
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+
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+static void finished_completion(void *pw, grpc_cq_completion *ignored) {
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+ int delete = 0;
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+ state_watcher *w = pw;
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+ gpr_mu_lock(&w->mu);
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+ switch (w->phase) {
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+ case WAITING:
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+ case CALLED_BACK:
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+ gpr_log(GPR_ERROR, "should never reach here");
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+ abort();
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+ break;
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+ case CALLING_BACK:
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+ w->phase = CALLED_BACK;
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+ break;
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+ case CALLING_BACK_AND_FINISHED:
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+ delete = 1;
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+ break;
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+ }
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+ gpr_mu_unlock(&w->mu);
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+
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+ if (delete) {
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+ delete_state_watcher(w);
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+ }
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+}
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+
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+static void partly_done(state_watcher *w, int due_to_completion) {
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+ int delete = 0;
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+
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+ if (due_to_completion) {
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+ gpr_mu_lock(&w->mu);
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+ w->success = 1;
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+ gpr_mu_unlock(&w->mu);
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+ grpc_alarm_cancel(&w->alarm);
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+ }
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+
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+ gpr_mu_lock(&w->mu);
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+ switch (w->phase) {
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+ case WAITING:
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+ w->phase = CALLING_BACK;
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+ if (w->optional_new_state) {
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+ *w->optional_new_state = w->state;
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+ }
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+ grpc_cq_end_op(w->cq, w->tag, w->success, finished_completion, w,
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+ &w->completion_storage);
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+ break;
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+ case CALLING_BACK:
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+ w->phase = CALLING_BACK_AND_FINISHED;
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+ break;
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+ case CALLING_BACK_AND_FINISHED:
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+ gpr_log(GPR_ERROR, "should never reach here");
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+ abort();
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+ break;
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+ case CALLED_BACK:
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+ delete = 1;
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+ break;
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+ }
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+ gpr_mu_unlock(&w->mu);
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+
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+ if (delete) {
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+ delete_state_watcher(w);
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+ }
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+}
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+
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+static void watch_complete(void *pw, int success) { partly_done(pw, 0); }
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+
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+static void timeout_complete(void *pw, int success) { partly_done(pw, 1); }
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+
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+void grpc_channel_watch_connectivity_state(
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+ grpc_channel *channel, grpc_connectivity_state last_observed_state,
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+ grpc_connectivity_state *optional_new_state, gpr_timespec deadline,
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+ grpc_completion_queue *cq, void *tag) {
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+ grpc_channel_element *client_channel_elem =
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+ grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
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+ state_watcher *w = gpr_malloc(sizeof(*w));
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+
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+ grpc_cq_begin_op(cq);
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+
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+ gpr_mu_init(&w->mu);
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+ grpc_iomgr_closure_init(&w->on_complete, watch_complete, w);
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+ w->phase = WAITING;
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+ w->state = last_observed_state;
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+ w->success = 0;
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+ w->optional_new_state = optional_new_state;
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+ w->cq = cq;
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+ w->tag = tag;
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+
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+ grpc_alarm_init(&w->alarm, deadline, timeout_complete, w,
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+ gpr_now(GPR_CLOCK_REALTIME));
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+
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+ if (client_channel_elem->filter != &grpc_client_channel_filter) {
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+ gpr_log(GPR_ERROR,
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+ "grpc_channel_watch_connectivity_state called on something that is "
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+ "not a client channel, but '%s'",
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+ client_channel_elem->filter->name);
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+ grpc_iomgr_add_delayed_callback(&w->on_complete, 1);
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+ } else {
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+ grpc_client_channel_watch_connectivity_state(client_channel_elem, &w->state,
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+ &w->on_complete);
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+ }
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+}
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Craig Tiller