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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/ext/transport/chttp2/client/chttp2_connector.h"
#include <grpc/grpc.h>
#include <string.h>
#include <grpc/slice_buffer.h>
#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/client_channel/connector.h"
#include "src/core/ext/client_channel/http_connect_handshaker.h"
#include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/handshaker.h"
#include "src/core/lib/iomgr/tcp_client.h"
#include "src/core/lib/security/transport/security_connector.h"
typedef struct {
grpc_connector base;
gpr_mu mu;
gpr_refcount refs;
bool shutdown;
bool connecting;
char *server_name;
grpc_chttp2_create_handshakers_func create_handshakers;
void *create_handshakers_user_data;
grpc_closure *notify;
grpc_connect_in_args args;
grpc_connect_out_args *result;
grpc_closure initial_string_sent;
grpc_slice_buffer initial_string_buffer;
grpc_endpoint *endpoint; // Non-NULL until handshaking starts.
grpc_closure connected;
grpc_handshake_manager *handshake_mgr;
} chttp2_connector;
static void chttp2_connector_ref(grpc_connector *con) {
chttp2_connector *c = (chttp2_connector *)con;
gpr_ref(&c->refs);
}
static void chttp2_connector_unref(grpc_exec_ctx *exec_ctx,
grpc_connector *con) {
chttp2_connector *c = (chttp2_connector *)con;
if (gpr_unref(&c->refs)) {
/* c->initial_string_buffer does not need to be destroyed */
gpr_mu_destroy(&c->mu);
// If handshaking is not yet in progress, destroy the endpoint.
// Otherwise, the handshaker will do this for us.
if (c->endpoint != NULL) grpc_endpoint_destroy(exec_ctx, c->endpoint);
gpr_free(c->server_name);
gpr_free(c);
}
}
static void chttp2_connector_shutdown(grpc_exec_ctx *exec_ctx,
grpc_connector *con) {
chttp2_connector *c = (chttp2_connector *)con;
gpr_mu_lock(&c->mu);
c->shutdown = true;
if (c->handshake_mgr != NULL) {
grpc_handshake_manager_shutdown(exec_ctx, c->handshake_mgr);
}
// If handshaking is not yet in progress, shutdown the endpoint.
// Otherwise, the handshaker will do this for us.
if (!c->connecting && c->endpoint != NULL) {
grpc_endpoint_shutdown(exec_ctx, c->endpoint);
}
gpr_mu_unlock(&c->mu);
}
static void on_handshake_done(grpc_exec_ctx *exec_ctx, void *arg,
grpc_error *error) {
grpc_handshaker_args *args = arg;
chttp2_connector *c = args->user_data;
gpr_mu_lock(&c->mu);
if (error != GRPC_ERROR_NONE || c->shutdown) {
if (error == GRPC_ERROR_NONE) {
error = GRPC_ERROR_CREATE("connector shutdown");
// We were shut down after handshaking completed successfully, so
// destroy the endpoint here.
// TODO(ctiller): It is currently necessary to shutdown endpoints
// before destroying them, even if we know that there are no
// pending read/write callbacks. This should be fixed, at which
// point this can be removed.
grpc_endpoint_shutdown(exec_ctx, args->endpoint);
grpc_endpoint_destroy(exec_ctx, args->endpoint);
grpc_channel_args_destroy(exec_ctx, args->args);
grpc_slice_buffer_destroy(args->read_buffer);
gpr_free(args->read_buffer);
} else {
error = GRPC_ERROR_REF(error);
}
memset(c->result, 0, sizeof(*c->result));
} else {
c->result->transport =
grpc_create_chttp2_transport(exec_ctx, args->args, args->endpoint, 1);
GPR_ASSERT(c->result->transport);
grpc_chttp2_transport_start_reading(exec_ctx, c->result->transport,
args->read_buffer);
c->result->channel_args = args->args;
}
grpc_closure *notify = c->notify;
c->notify = NULL;
grpc_exec_ctx_sched(exec_ctx, notify, error, NULL);
grpc_handshake_manager_destroy(exec_ctx, c->handshake_mgr);
c->handshake_mgr = NULL;
gpr_mu_unlock(&c->mu);
chttp2_connector_unref(exec_ctx, (grpc_connector *)c);
}
static void start_handshake_locked(grpc_exec_ctx *exec_ctx,
chttp2_connector *c) {
c->handshake_mgr = grpc_handshake_manager_create();
char *proxy_name = grpc_get_http_proxy_server();
if (proxy_name != NULL) {
grpc_handshake_manager_add(
c->handshake_mgr,
grpc_http_connect_handshaker_create(proxy_name, c->server_name));
gpr_free(proxy_name);
}
if (c->create_handshakers != NULL) {
c->create_handshakers(exec_ctx, c->create_handshakers_user_data,
c->handshake_mgr);
}
grpc_handshake_manager_do_handshake(
exec_ctx, c->handshake_mgr, c->endpoint, c->args.channel_args,
c->args.deadline, NULL /* acceptor */, on_handshake_done, c);
c->endpoint = NULL; // Endpoint handed off to handshake manager.
}
static void on_initial_connect_string_sent(grpc_exec_ctx *exec_ctx, void *arg,
grpc_error *error) {
chttp2_connector *c = arg;
gpr_mu_lock(&c->mu);
if (error != GRPC_ERROR_NONE || c->shutdown) {
if (error == GRPC_ERROR_NONE) {
error = GRPC_ERROR_CREATE("connector shutdown");
} else {
error = GRPC_ERROR_REF(error);
}
memset(c->result, 0, sizeof(*c->result));
grpc_closure *notify = c->notify;
c->notify = NULL;
grpc_exec_ctx_sched(exec_ctx, notify, error, NULL);
gpr_mu_unlock(&c->mu);
chttp2_connector_unref(exec_ctx, arg);
} else {
start_handshake_locked(exec_ctx, c);
gpr_mu_unlock(&c->mu);
}
}
static void connected(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error) {
chttp2_connector *c = arg;
gpr_mu_lock(&c->mu);
GPR_ASSERT(c->connecting);
c->connecting = false;
if (error != GRPC_ERROR_NONE || c->shutdown) {
if (error == GRPC_ERROR_NONE) {
error = GRPC_ERROR_CREATE("connector shutdown");
} else {
error = GRPC_ERROR_REF(error);
}
memset(c->result, 0, sizeof(*c->result));
grpc_closure *notify = c->notify;
c->notify = NULL;
grpc_exec_ctx_sched(exec_ctx, notify, error, NULL);
if (c->endpoint != NULL) grpc_endpoint_shutdown(exec_ctx, c->endpoint);
gpr_mu_unlock(&c->mu);
chttp2_connector_unref(exec_ctx, arg);
} else {
GPR_ASSERT(c->endpoint != NULL);
if (!GRPC_SLICE_IS_EMPTY(c->args.initial_connect_string)) {
grpc_closure_init(&c->initial_string_sent, on_initial_connect_string_sent,
c);
grpc_slice_buffer_init(&c->initial_string_buffer);
grpc_slice_buffer_add(&c->initial_string_buffer,
c->args.initial_connect_string);
grpc_endpoint_write(exec_ctx, c->endpoint, &c->initial_string_buffer,
&c->initial_string_sent);
} else {
start_handshake_locked(exec_ctx, c);
}
gpr_mu_unlock(&c->mu);
}
}
static void chttp2_connector_connect(grpc_exec_ctx *exec_ctx,
grpc_connector *con,
const grpc_connect_in_args *args,
grpc_connect_out_args *result,
grpc_closure *notify) {
chttp2_connector *c = (chttp2_connector *)con;
gpr_mu_lock(&c->mu);
GPR_ASSERT(c->notify == NULL);
c->notify = notify;
c->args = *args;
c->result = result;
GPR_ASSERT(c->endpoint == NULL);
chttp2_connector_ref(con); // Ref taken for callback.
grpc_closure_init(&c->connected, connected, c);
GPR_ASSERT(!c->connecting);
c->connecting = true;
grpc_tcp_client_connect(exec_ctx, &c->connected, &c->endpoint,
args->interested_parties, args->channel_args,
args->addr, args->deadline);
gpr_mu_unlock(&c->mu);
}
static const grpc_connector_vtable chttp2_connector_vtable = {
chttp2_connector_ref, chttp2_connector_unref, chttp2_connector_shutdown,
chttp2_connector_connect};
grpc_connector *grpc_chttp2_connector_create(
grpc_exec_ctx *exec_ctx, const char *server_name,
grpc_chttp2_create_handshakers_func create_handshakers,
void *create_handshakers_user_data) {
chttp2_connector *c = gpr_malloc(sizeof(*c));
memset(c, 0, sizeof(*c));
c->base.vtable = &chttp2_connector_vtable;
gpr_mu_init(&c->mu);
gpr_ref_init(&c->refs, 1);
c->server_name = gpr_strdup(server_name);
c->create_handshakers = create_handshakers;
c->create_handshakers_user_data = create_handshakers_user_data;
return &c->base;
}
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