diff options
Diffstat (limited to 'src/core/lib/channel/http_client_filter.c')
| -rw-r--r-- | src/core/lib/channel/http_client_filter.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/src/core/lib/channel/http_client_filter.c b/src/core/lib/channel/http_client_filter.c new file mode 100644 index 0000000000..211f537c69 --- /dev/null +++ b/src/core/lib/channel/http_client_filter.c @@ -0,0 +1,259 @@ +/* + * 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/channel/http_client_filter.h" +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <string.h> +#include "src/core/lib/profiling/timers.h" +#include "src/core/lib/support/string.h" +#include "src/core/lib/transport/static_metadata.h" + +typedef struct call_data { + grpc_linked_mdelem method; + grpc_linked_mdelem scheme; + grpc_linked_mdelem authority; + grpc_linked_mdelem te_trailers; + grpc_linked_mdelem content_type; + grpc_linked_mdelem user_agent; + + grpc_metadata_batch *recv_initial_metadata; + + /** Closure to call when finished with the hc_on_recv hook */ + grpc_closure *on_done_recv; + /** Receive closures are chained: we inject this closure as the on_done_recv + up-call on transport_op, and remember to call our on_done_recv member + after handling it. */ + grpc_closure hc_on_recv; +} call_data; + +typedef struct channel_data { + grpc_mdelem *static_scheme; + grpc_mdelem *user_agent; +} channel_data; + +typedef struct { + grpc_call_element *elem; + grpc_exec_ctx *exec_ctx; +} client_recv_filter_args; + +static grpc_mdelem *client_recv_filter(void *user_data, grpc_mdelem *md) { + client_recv_filter_args *a = user_data; + if (md == GRPC_MDELEM_STATUS_200) { + return NULL; + } else if (md->key == GRPC_MDSTR_STATUS) { + grpc_call_element_send_cancel(a->exec_ctx, a->elem); + return NULL; + } else if (md->key == GRPC_MDSTR_CONTENT_TYPE) { + return NULL; + } + return md; +} + +static void hc_on_recv(grpc_exec_ctx *exec_ctx, void *user_data, bool success) { + grpc_call_element *elem = user_data; + call_data *calld = elem->call_data; + client_recv_filter_args a; + a.elem = elem; + a.exec_ctx = exec_ctx; + grpc_metadata_batch_filter(calld->recv_initial_metadata, client_recv_filter, + &a); + calld->on_done_recv->cb(exec_ctx, calld->on_done_recv->cb_arg, success); +} + +static grpc_mdelem *client_strip_filter(void *user_data, grpc_mdelem *md) { + /* eat the things we'd like to set ourselves */ + if (md->key == GRPC_MDSTR_METHOD) return NULL; + if (md->key == GRPC_MDSTR_SCHEME) return NULL; + if (md->key == GRPC_MDSTR_TE) return NULL; + if (md->key == GRPC_MDSTR_CONTENT_TYPE) return NULL; + if (md->key == GRPC_MDSTR_USER_AGENT) return NULL; + return md; +} + +static void hc_mutate_op(grpc_call_element *elem, + grpc_transport_stream_op *op) { + /* grab pointers to our data from the call element */ + call_data *calld = elem->call_data; + channel_data *channeld = elem->channel_data; + if (op->send_initial_metadata != NULL) { + grpc_metadata_batch_filter(op->send_initial_metadata, client_strip_filter, + elem); + /* Send : prefixed headers, which have to be before any application + layer headers. */ + grpc_metadata_batch_add_head( + op->send_initial_metadata, &calld->method, + op->send_initial_metadata_flags & + GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST + ? GRPC_MDELEM_METHOD_PUT + : GRPC_MDELEM_METHOD_POST); + grpc_metadata_batch_add_head(op->send_initial_metadata, &calld->scheme, + channeld->static_scheme); + grpc_metadata_batch_add_tail(op->send_initial_metadata, &calld->te_trailers, + GRPC_MDELEM_TE_TRAILERS); + grpc_metadata_batch_add_tail( + op->send_initial_metadata, &calld->content_type, + GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC); + grpc_metadata_batch_add_tail(op->send_initial_metadata, &calld->user_agent, + GRPC_MDELEM_REF(channeld->user_agent)); + } + + if (op->recv_initial_metadata != NULL) { + /* substitute our callback for the higher callback */ + calld->recv_initial_metadata = op->recv_initial_metadata; + calld->on_done_recv = op->recv_initial_metadata_ready; + op->recv_initial_metadata_ready = &calld->hc_on_recv; + } +} + +static void hc_start_transport_op(grpc_exec_ctx *exec_ctx, + grpc_call_element *elem, + grpc_transport_stream_op *op) { + GPR_TIMER_BEGIN("hc_start_transport_op", 0); + GRPC_CALL_LOG_OP(GPR_INFO, elem, op); + hc_mutate_op(elem, op); + GPR_TIMER_END("hc_start_transport_op", 0); + grpc_call_next_op(exec_ctx, elem, op); +} + +/* Constructor for call_data */ +static void init_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, + grpc_call_element_args *args) { + call_data *calld = elem->call_data; + calld->on_done_recv = NULL; + grpc_closure_init(&calld->hc_on_recv, hc_on_recv, elem); +} + +/* Destructor for call_data */ +static void destroy_call_elem(grpc_exec_ctx *exec_ctx, + grpc_call_element *elem) {} + +static grpc_mdelem *scheme_from_args(const grpc_channel_args *args) { + unsigned i; + size_t j; + grpc_mdelem *valid_schemes[] = {GRPC_MDELEM_SCHEME_HTTP, + GRPC_MDELEM_SCHEME_HTTPS}; + if (args != NULL) { + for (i = 0; i < args->num_args; ++i) { + if (args->args[i].type == GRPC_ARG_STRING && + strcmp(args->args[i].key, GRPC_ARG_HTTP2_SCHEME) == 0) { + for (j = 0; j < GPR_ARRAY_SIZE(valid_schemes); j++) { + if (0 == strcmp(grpc_mdstr_as_c_string(valid_schemes[j]->value), + args->args[i].value.string)) { + return valid_schemes[j]; + } + } + } + } + } + return GRPC_MDELEM_SCHEME_HTTP; +} + +static grpc_mdstr *user_agent_from_args(const grpc_channel_args *args) { + gpr_strvec v; + size_t i; + int is_first = 1; + char *tmp; + grpc_mdstr *result; + + gpr_strvec_init(&v); + + for (i = 0; args && i < args->num_args; i++) { + if (0 == strcmp(args->args[i].key, GRPC_ARG_PRIMARY_USER_AGENT_STRING)) { + if (args->args[i].type != GRPC_ARG_STRING) { + gpr_log(GPR_ERROR, "Channel argument '%s' should be a string", + GRPC_ARG_PRIMARY_USER_AGENT_STRING); + } else { + if (!is_first) gpr_strvec_add(&v, gpr_strdup(" ")); + is_first = 0; + gpr_strvec_add(&v, gpr_strdup(args->args[i].value.string)); + } + } + } + + gpr_asprintf(&tmp, "%sgrpc-c/%s (%s)", is_first ? "" : " ", + grpc_version_string(), GPR_PLATFORM_STRING); + is_first = 0; + gpr_strvec_add(&v, tmp); + + for (i = 0; args && i < args->num_args; i++) { + if (0 == strcmp(args->args[i].key, GRPC_ARG_SECONDARY_USER_AGENT_STRING)) { + if (args->args[i].type != GRPC_ARG_STRING) { + gpr_log(GPR_ERROR, "Channel argument '%s' should be a string", + GRPC_ARG_SECONDARY_USER_AGENT_STRING); + } else { + if (!is_first) gpr_strvec_add(&v, gpr_strdup(" ")); + is_first = 0; + gpr_strvec_add(&v, gpr_strdup(args->args[i].value.string)); + } + } + } + + tmp = gpr_strvec_flatten(&v, NULL); + gpr_strvec_destroy(&v); + result = grpc_mdstr_from_string(tmp); + gpr_free(tmp); + + return result; +} + +/* Constructor for channel_data */ +static void init_channel_elem(grpc_exec_ctx *exec_ctx, + grpc_channel_element *elem, + grpc_channel_element_args *args) { + channel_data *chand = elem->channel_data; + GPR_ASSERT(!args->is_last); + chand->static_scheme = scheme_from_args(args->channel_args); + chand->user_agent = grpc_mdelem_from_metadata_strings( + GRPC_MDSTR_USER_AGENT, user_agent_from_args(args->channel_args)); +} + +/* Destructor for channel data */ +static void destroy_channel_elem(grpc_exec_ctx *exec_ctx, + grpc_channel_element *elem) { + channel_data *chand = elem->channel_data; + GRPC_MDELEM_UNREF(chand->user_agent); +} + +const grpc_channel_filter grpc_http_client_filter = { + hc_start_transport_op, + grpc_channel_next_op, + sizeof(call_data), + init_call_elem, + grpc_call_stack_ignore_set_pollset, + destroy_call_elem, + sizeof(channel_data), + init_channel_elem, + destroy_channel_elem, + grpc_call_next_get_peer, + "http-client"}; |