Merge pull request #4325 from ctiller/ping-ping-ping-ping-ping-ping-ping-ping-ping

Ping support for channels

1 files changed, 79 insertions, 0 deletions

diff --git a/src/core/surface/channel_ping.c b/src/core/surface/channel_ping.c
new file mode 100644
index 0000000000..1b6f06ded1
--- /dev/null
+++ b/src/core/surface/channel_ping.c
@@ -0,0 +1,79 @@
+/*
+ *
+ * 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/surface/channel.h"
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/surface/api_trace.h"
+#include "src/core/surface/completion_queue.h"
+
+typedef struct {
+  grpc_closure closure;
+  void *tag;
+  grpc_completion_queue *cq;
+  grpc_cq_completion completion_storage;
+} ping_result;
+
+static void ping_destroy(grpc_exec_ctx *exec_ctx, void *arg,
+                         grpc_cq_completion *storage) {
+  gpr_free(arg);
+}
+
+static void ping_done(grpc_exec_ctx *exec_ctx, void *arg, int success) {
+  ping_result *pr = arg;
+  grpc_cq_end_op(exec_ctx, pr->cq, pr->tag, success, ping_destroy, pr,
+                 &pr->completion_storage);
+}
+
+void grpc_channel_ping(grpc_channel *channel, grpc_completion_queue *cq,
+                       void *tag, void *reserved) {
+  grpc_transport_op op;
+  ping_result *pr = gpr_malloc(sizeof(*pr));
+  grpc_channel_element *top_elem =
+      grpc_channel_stack_element(grpc_channel_get_channel_stack(channel), 0);
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  GPR_ASSERT(reserved == NULL);
+  memset(&op, 0, sizeof(op));
+  pr->tag = tag;
+  pr->cq = cq;
+  grpc_closure_init(&pr->closure, ping_done, pr);
+  op.send_ping = &pr->closure;
+  op.bind_pollset = grpc_cq_pollset(cq);
+  grpc_cq_begin_op(cq);
+  top_elem->filter->start_transport_op(&exec_ctx, top_elem, &op);
+  grpc_exec_ctx_finish(&exec_ctx);
+}