Initial checkin of gRPC to third_party/

third_party/grpc/src/core/surface/channel_create.c

+/*
+ *
+ * Copyright 2015-2016, 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 <grpc/grpc.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/slice.h>
+#include <grpc/support/slice_buffer.h>
+
+#include "src/core/census/grpc_filter.h"
+#include "src/core/channel/channel_args.h"
+#include "src/core/channel/client_channel.h"
+#include "src/core/channel/compress_filter.h"
+#include "src/core/channel/http_client_filter.h"
+#include "src/core/client_config/resolver_registry.h"
+#include "src/core/iomgr/tcp_client.h"
+#include "src/core/surface/api_trace.h"
+#include "src/core/surface/channel.h"
+#include "src/core/transport/chttp2_transport.h"
+
+typedef struct {
+  grpc_connector base;
+  gpr_refcount refs;
+
+  grpc_closure *notify;
+  grpc_connect_in_args args;
+  grpc_connect_out_args *result;
+  grpc_closure initial_string_sent;
+  gpr_slice_buffer initial_string_buffer;
+
+  grpc_endpoint *tcp;
+
+  grpc_closure connected;
+} connector;
+
+static void connector_ref(grpc_connector *con) {
+  connector *c = (connector *)con;
+  gpr_ref(&c->refs);
+}
+
+static void connector_unref(grpc_exec_ctx *exec_ctx, grpc_connector *con) {
+  connector *c = (connector *)con;
+  if (gpr_unref(&c->refs)) {
+    /* c->initial_string_buffer does not need to be destroyed */
+    gpr_free(c);
+  }
+}
+
+static void on_initial_connect_string_sent(grpc_exec_ctx *exec_ctx, void *arg,
+                                           bool success) {
+  connector_unref(exec_ctx, arg);
+}
+
+static void connected(grpc_exec_ctx *exec_ctx, void *arg, bool success) {
+  connector *c = arg;
+  grpc_closure *notify;
+  grpc_endpoint *tcp = c->tcp;
+  if (tcp != NULL) {
+    if (!GPR_SLICE_IS_EMPTY(c->args.initial_connect_string)) {
+      grpc_closure_init(&c->initial_string_sent, on_initial_connect_string_sent,
+                        c);
+      gpr_slice_buffer_init(&c->initial_string_buffer);
+      gpr_slice_buffer_add(&c->initial_string_buffer,
+                           c->args.initial_connect_string);
+      connector_ref(arg);
+      grpc_endpoint_write(exec_ctx, tcp, &c->initial_string_buffer,
+                          &c->initial_string_sent);
+    }
+    c->result->transport =
+        grpc_create_chttp2_transport(exec_ctx, c->args.channel_args, tcp, 1);
+    grpc_chttp2_transport_start_reading(exec_ctx, c->result->transport, NULL,
+                                        0);
+    GPR_ASSERT(c->result->transport);
+    c->result->channel_args = c->args.channel_args;
+    c->result->filters = gpr_malloc(sizeof(grpc_channel_filter *));
+    c->result->filters[0] = &grpc_http_client_filter;
+    c->result->num_filters = 1;
+  } else {
+    memset(c->result, 0, sizeof(*c->result));
+  }
+  notify = c->notify;
+  c->notify = NULL;
+  notify->cb(exec_ctx, notify->cb_arg, 1);
+}
+
+static void connector_shutdown(grpc_exec_ctx *exec_ctx, grpc_connector *con) {}
+
+static void connector_connect(grpc_exec_ctx *exec_ctx, grpc_connector *con,
+                              const grpc_connect_in_args *args,
+                              grpc_connect_out_args *result,
+                              grpc_closure *notify) {
+  connector *c = (connector *)con;
+  GPR_ASSERT(c->notify == NULL);
+  GPR_ASSERT(notify->cb);
+  c->notify = notify;
+  c->args = *args;
+  c->result = result;
+  c->tcp = NULL;
+  grpc_closure_init(&c->connected, connected, c);
+  grpc_tcp_client_connect(exec_ctx, &c->connected, &c->tcp,
+                          args->interested_parties, args->addr, args->addr_len,
+                          args->deadline);
+}
+
+static const grpc_connector_vtable connector_vtable = {
+    connector_ref, connector_unref, connector_shutdown, connector_connect};
+
+typedef struct {
+  grpc_subchannel_factory base;
+  gpr_refcount refs;
+  grpc_channel_args *merge_args;
+  grpc_channel *master;
+} subchannel_factory;
+
+static void subchannel_factory_ref(grpc_subchannel_factory *scf) {
+  subchannel_factory *f = (subchannel_factory *)scf;
+  gpr_ref(&f->refs);
+}
+
+static void subchannel_factory_unref(grpc_exec_ctx *exec_ctx,
+                                     grpc_subchannel_factory *scf) {
+  subchannel_factory *f = (subchannel_factory *)scf;
+  if (gpr_unref(&f->refs)) {
+    GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, f->master, "subchannel_factory");
+    grpc_channel_args_destroy(f->merge_args);
+    gpr_free(f);
+  }
+}
+
+static grpc_subchannel *subchannel_factory_create_subchannel(
+    grpc_exec_ctx *exec_ctx, grpc_subchannel_factory *scf,
+    grpc_subchannel_args *args) {
+  subchannel_factory *f = (subchannel_factory *)scf;
+  connector *c = gpr_malloc(sizeof(*c));
+  grpc_channel_args *final_args =
+      grpc_channel_args_merge(args->args, f->merge_args);
+  grpc_subchannel *s;
+  memset(c, 0, sizeof(*c));
+  c->base.vtable = &connector_vtable;
+  gpr_ref_init(&c->refs, 1);
+  args->args = final_args;
+  s = grpc_subchannel_create(exec_ctx, &c->base, args);
+  grpc_connector_unref(exec_ctx, &c->base);
+  grpc_channel_args_destroy(final_args);
+  return s;
+}
+
+static const grpc_subchannel_factory_vtable subchannel_factory_vtable = {
+    subchannel_factory_ref, subchannel_factory_unref,
+    subchannel_factory_create_subchannel};
+
+/* Create a client channel:
+   Asynchronously: - resolve target
+                   - connect to it (trying alternatives as presented)
+                   - perform handshakes */
+grpc_channel *grpc_insecure_channel_create(const char *target,
+                                           const grpc_channel_args *args,
+                                           void *reserved) {
+  grpc_channel *channel = NULL;
+#define MAX_FILTERS 3
+  const grpc_channel_filter *filters[MAX_FILTERS];
+  grpc_resolver *resolver;
+  subchannel_factory *f;
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  size_t n = 0;
+  GRPC_API_TRACE(
+      "grpc_insecure_channel_create(target=%p, args=%p, reserved=%p)", 3,
+      (target, args, reserved));
+  GPR_ASSERT(!reserved);
+  if (grpc_channel_args_is_census_enabled(args)) {
+    filters[n++] = &grpc_client_census_filter;
+  }
+  filters[n++] = &grpc_compress_filter;
+  filters[n++] = &grpc_client_channel_filter;
+  GPR_ASSERT(n <= MAX_FILTERS);
+
+  channel =
+      grpc_channel_create_from_filters(&exec_ctx, target, filters, n, args, 1);
+
+  f = gpr_malloc(sizeof(*f));
+  f->base.vtable = &subchannel_factory_vtable;
+  gpr_ref_init(&f->refs, 1);
+  f->merge_args = grpc_channel_args_copy(args);
+  f->master = channel;
+  GRPC_CHANNEL_INTERNAL_REF(f->master, "subchannel_factory");
+  resolver = grpc_resolver_create(target, &f->base);
+  if (!resolver) {
+    GRPC_CHANNEL_INTERNAL_UNREF(&exec_ctx, f->master, "subchannel_factory");
+    grpc_subchannel_factory_unref(&exec_ctx, &f->base);
+    grpc_exec_ctx_finish(&exec_ctx);
+    return NULL;
+  }
+
+  grpc_client_channel_set_resolver(
+      &exec_ctx, grpc_channel_get_channel_stack(channel), resolver);
+  GRPC_RESOLVER_UNREF(&exec_ctx, resolver, "create");
+  grpc_subchannel_factory_unref(&exec_ctx, &f->base);
+
+  grpc_exec_ctx_finish(&exec_ctx);
+
+  return channel;
+}