| /* |
| * |
| * 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 <grpc/grpc.h> |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.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/channel.h" |
| #include "src/core/transport/chttp2_transport.h" |
| |
| typedef struct { |
| grpc_connector base; |
| gpr_refcount refs; |
| |
| grpc_iomgr_closure *notify; |
| grpc_connect_in_args args; |
| grpc_connect_out_args *result; |
| } connector; |
| |
| static void connector_ref(grpc_connector *con) { |
| connector *c = (connector *)con; |
| gpr_ref(&c->refs); |
| } |
| |
| static void connector_unref(grpc_connector *con) { |
| connector *c = (connector *)con; |
| if (gpr_unref(&c->refs)) { |
| gpr_free(c); |
| } |
| } |
| |
| static void connected(void *arg, grpc_endpoint *tcp) { |
| connector *c = arg; |
| grpc_iomgr_closure *notify; |
| if (tcp != NULL) { |
| c->result->transport = grpc_create_chttp2_transport( |
| c->args.channel_args, tcp, c->args.metadata_context, 1); |
| grpc_chttp2_transport_start_reading(c->result->transport, NULL, 0); |
| GPR_ASSERT(c->result->transport); |
| 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; |
| grpc_iomgr_add_callback(notify); |
| } |
| |
| static void connector_connect(grpc_connector *con, |
| const grpc_connect_in_args *args, |
| grpc_connect_out_args *result, |
| grpc_iomgr_closure *notify) { |
| connector *c = (connector *)con; |
| GPR_ASSERT(c->notify == NULL); |
| GPR_ASSERT(notify->cb); |
| c->notify = notify; |
| c->args = *args; |
| c->result = result; |
| grpc_tcp_client_connect(connected, c, args->interested_parties, args->addr, |
| args->addr_len, args->deadline); |
| } |
| |
| static const grpc_connector_vtable connector_vtable = { |
| connector_ref, connector_unref, connector_connect}; |
| |
| typedef struct { |
| grpc_subchannel_factory base; |
| gpr_refcount refs; |
| grpc_mdctx *mdctx; |
| grpc_channel_args *merge_args; |
| } 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_subchannel_factory *scf) { |
| subchannel_factory *f = (subchannel_factory *)scf; |
| if (gpr_unref(&f->refs)) { |
| grpc_channel_args_destroy(f->merge_args); |
| grpc_mdctx_unref(f->mdctx); |
| gpr_free(f); |
| } |
| } |
| |
| static grpc_subchannel *subchannel_factory_create_subchannel( |
| 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->mdctx = f->mdctx; |
| args->args = final_args; |
| s = grpc_subchannel_create(&c->base, args); |
| grpc_connector_unref(&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_channel_create(const char *target, |
| const grpc_channel_args *args) { |
| grpc_channel *channel = NULL; |
| #define MAX_FILTERS 3 |
| const grpc_channel_filter *filters[MAX_FILTERS]; |
| grpc_resolver *resolver; |
| subchannel_factory *f; |
| grpc_mdctx *mdctx = grpc_mdctx_create(); |
| int n = 0; |
| /* TODO(census) |
| 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); |
| |
| f = gpr_malloc(sizeof(*f)); |
| f->base.vtable = &subchannel_factory_vtable; |
| gpr_ref_init(&f->refs, 1); |
| grpc_mdctx_ref(mdctx); |
| f->mdctx = mdctx; |
| f->merge_args = grpc_channel_args_copy(args); |
| resolver = grpc_resolver_create(target, &f->base); |
| if (!resolver) { |
| return NULL; |
| } |
| |
| channel = grpc_channel_create_from_filters(filters, n, args, mdctx, 1); |
| grpc_client_channel_set_resolver(grpc_channel_get_channel_stack(channel), |
| resolver); |
| GRPC_RESOLVER_UNREF(resolver, "create"); |
| grpc_subchannel_factory_unref(&f->base); |
| |
| return channel; |
| } |