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-rw-r--r--src/core/ext/client_channel/channel_connectivity.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/src/core/ext/client_channel/channel_connectivity.c b/src/core/ext/client_channel/channel_connectivity.c
new file mode 100644
index 0000000000..9797e66564
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+++ b/src/core/ext/client_channel/channel_connectivity.c
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+/*
+ *
+ * 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/surface/channel.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/ext/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_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+ grpc_connectivity_state state;
+ GRPC_API_TRACE(
+ "grpc_channel_check_connectivity_state(channel=%p, try_to_connect=%d)", 2,
+ (channel, try_to_connect));
+ if (client_channel_elem->filter == &grpc_client_channel_filter) {
+ state = grpc_client_channel_check_connectivity_state(
+ &exec_ctx, client_channel_elem, try_to_connect);
+ grpc_exec_ctx_finish(&exec_ctx);
+ 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);
+ grpc_exec_ctx_finish(&exec_ctx);
+ return GRPC_CHANNEL_SHUTDOWN;
+}
+
+typedef enum {
+ WAITING,
+ CALLING_BACK,
+ CALLING_BACK_AND_FINISHED,
+ CALLED_BACK
+} callback_phase;
+
+typedef struct {
+ gpr_mu mu;
+ callback_phase phase;
+ grpc_closure on_complete;
+ grpc_timer alarm;
+ grpc_connectivity_state state;
+ grpc_completion_queue *cq;
+ grpc_cq_completion completion_storage;
+ grpc_channel *channel;
+ void *tag;
+} state_watcher;
+
+static void delete_state_watcher(grpc_exec_ctx *exec_ctx, 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(exec_ctx, w->channel,
+ "watch_channel_connectivity");
+ } else {
+ abort();
+ }
+ gpr_mu_destroy(&w->mu);
+ gpr_free(w);
+}
+
+static void finished_completion(grpc_exec_ctx *exec_ctx, void *pw,
+ grpc_cq_completion *ignored) {
+ int delete = 0;
+ state_watcher *w = pw;
+ gpr_mu_lock(&w->mu);
+ switch (w->phase) {
+ case WAITING:
+ case CALLED_BACK:
+ GPR_UNREACHABLE_CODE(return );
+ case CALLING_BACK:
+ w->phase = CALLED_BACK;
+ break;
+ case CALLING_BACK_AND_FINISHED:
+ delete = 1;
+ break;
+ }
+ gpr_mu_unlock(&w->mu);
+
+ if (delete) {
+ delete_state_watcher(exec_ctx, w);
+ }
+}
+
+static void partly_done(grpc_exec_ctx *exec_ctx, state_watcher *w,
+ bool due_to_completion, grpc_error *error) {
+ int delete = 0;
+
+ if (due_to_completion) {
+ grpc_timer_cancel(exec_ctx, &w->alarm);
+ }
+
+ gpr_mu_lock(&w->mu);
+
+ if (due_to_completion) {
+ if (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("Timed out waiting for connection state change");
+ } else if (error == GRPC_ERROR_CANCELLED) {
+ error = GRPC_ERROR_NONE;
+ }
+ }
+ switch (w->phase) {
+ case WAITING:
+ w->phase = CALLING_BACK;
+ grpc_cq_end_op(exec_ctx, w->cq, w->tag, GRPC_ERROR_REF(error),
+ finished_completion, w, &w->completion_storage);
+ break;
+ case CALLING_BACK:
+ w->phase = CALLING_BACK_AND_FINISHED;
+ break;
+ case CALLING_BACK_AND_FINISHED:
+ GPR_UNREACHABLE_CODE(return );
+ case CALLED_BACK:
+ delete = 1;
+ break;
+ }
+ gpr_mu_unlock(&w->mu);
+
+ if (delete) {
+ delete_state_watcher(exec_ctx, w);
+ }
+
+ GRPC_ERROR_UNREF(error);
+}
+
+static void watch_complete(grpc_exec_ctx *exec_ctx, void *pw,
+ grpc_error *error) {
+ partly_done(exec_ctx, pw, true, GRPC_ERROR_REF(error));
+}
+
+static void timeout_complete(grpc_exec_ctx *exec_ctx, void *pw,
+ grpc_error *error) {
+ partly_done(exec_ctx, pw, false, GRPC_ERROR_REF(error));
+}
+
+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_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+ state_watcher *w = 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));
+
+ grpc_cq_begin_op(cq, tag);
+
+ gpr_mu_init(&w->mu);
+ grpc_closure_init(&w->on_complete, watch_complete, w);
+ w->phase = WAITING;
+ w->state = last_observed_state;
+ w->cq = cq;
+ w->tag = tag;
+ w->channel = channel;
+
+ grpc_timer_init(&exec_ctx, &w->alarm,
+ gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC),
+ timeout_complete, w, gpr_now(GPR_CLOCK_MONOTONIC));
+
+ if (client_channel_elem->filter == &grpc_client_channel_filter) {
+ GRPC_CHANNEL_INTERNAL_REF(channel, "watch_channel_connectivity");
+ grpc_client_channel_watch_connectivity_state(&exec_ctx, client_channel_elem,
+ grpc_cq_pollset(cq), &w->state,
+ &w->on_complete);
+ } else {
+ abort();
+ }
+
+ grpc_exec_ctx_finish(&exec_ctx);
+}