| /* |
| * 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/channel/http_client_filter.h" |
| #include <string.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include "src/core/support/string.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; |
| int sent_initial_metadata; |
| |
| int got_initial_metadata; |
| grpc_stream_op_buffer *recv_ops; |
| |
| /** Closure to call when finished with the hc_on_recv hook */ |
| grpc_iomgr_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_iomgr_closure hc_on_recv; |
| } call_data; |
| |
| typedef struct channel_data { |
| grpc_mdelem *te_trailers; |
| grpc_mdelem *method; |
| grpc_mdelem *scheme; |
| grpc_mdelem *content_type; |
| grpc_mdelem *status; |
| /** complete user agent mdelem */ |
| grpc_mdelem *user_agent; |
| } channel_data; |
| |
| /* used to silence 'variable not used' warnings */ |
| static void ignore_unused(void *ignored) {} |
| |
| static grpc_mdelem *client_filter(void *user_data, grpc_mdelem *md) { |
| grpc_call_element *elem = user_data; |
| channel_data *channeld = elem->channel_data; |
| if (md == channeld->status) { |
| return NULL; |
| } else if (md->key == channeld->status->key) { |
| grpc_call_element_send_cancel(elem); |
| return NULL; |
| } |
| return md; |
| } |
| |
| static void hc_on_recv(void *user_data, int success) { |
| grpc_call_element *elem = user_data; |
| call_data *calld = elem->call_data; |
| if (success) { |
| size_t i; |
| size_t nops = calld->recv_ops->nops; |
| grpc_stream_op *ops = calld->recv_ops->ops; |
| for (i = 0; i < nops; i++) { |
| grpc_stream_op *op = &ops[i]; |
| if (op->type != GRPC_OP_METADATA) continue; |
| calld->got_initial_metadata = 1; |
| grpc_metadata_batch_filter(&op->data.metadata, client_filter, elem); |
| } |
| } |
| calld->on_done_recv->cb(calld->on_done_recv->cb_arg, success); |
| } |
| |
| static grpc_mdelem *client_strip_filter(void *user_data, grpc_mdelem *md) { |
| grpc_call_element *elem = user_data; |
| channel_data *channeld = elem->channel_data; |
| /* eat the things we'd like to set ourselves */ |
| if (md->key == channeld->method->key) return NULL; |
| if (md->key == channeld->scheme->key) return NULL; |
| if (md->key == channeld->te_trailers->key) return NULL; |
| if (md->key == channeld->content_type->key) return NULL; |
| if (md->key == channeld->user_agent->key) 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; |
| size_t i; |
| if (op->send_ops && !calld->sent_initial_metadata) { |
| size_t nops = op->send_ops->nops; |
| grpc_stream_op *ops = op->send_ops->ops; |
| for (i = 0; i < nops; i++) { |
| grpc_stream_op *op = &ops[i]; |
| if (op->type != GRPC_OP_METADATA) continue; |
| calld->sent_initial_metadata = 1; |
| grpc_metadata_batch_filter(&op->data.metadata, client_strip_filter, elem); |
| /* Send : prefixed headers, which have to be before any application |
| layer headers. */ |
| grpc_metadata_batch_add_head(&op->data.metadata, &calld->method, |
| GRPC_MDELEM_REF(channeld->method)); |
| grpc_metadata_batch_add_head(&op->data.metadata, &calld->scheme, |
| GRPC_MDELEM_REF(channeld->scheme)); |
| grpc_metadata_batch_add_tail(&op->data.metadata, &calld->te_trailers, |
| GRPC_MDELEM_REF(channeld->te_trailers)); |
| grpc_metadata_batch_add_tail(&op->data.metadata, &calld->content_type, |
| GRPC_MDELEM_REF(channeld->content_type)); |
| grpc_metadata_batch_add_tail(&op->data.metadata, &calld->user_agent, |
| GRPC_MDELEM_REF(channeld->user_agent)); |
| break; |
| } |
| } |
| |
| if (op->recv_ops && !calld->got_initial_metadata) { |
| /* substitute our callback for the higher callback */ |
| calld->recv_ops = op->recv_ops; |
| calld->on_done_recv = op->on_done_recv; |
| op->on_done_recv = &calld->hc_on_recv; |
| } |
| } |
| |
| static void hc_start_transport_op(grpc_call_element *elem, |
| grpc_transport_stream_op *op) { |
| GRPC_CALL_LOG_OP(GPR_INFO, elem, op); |
| hc_mutate_op(elem, op); |
| grpc_call_next_op(elem, op); |
| } |
| |
| /* Constructor for call_data */ |
| static void init_call_elem(grpc_call_element *elem, |
| const void *server_transport_data, |
| grpc_transport_stream_op *initial_op) { |
| call_data *calld = elem->call_data; |
| calld->sent_initial_metadata = 0; |
| calld->got_initial_metadata = 0; |
| calld->on_done_recv = NULL; |
| grpc_iomgr_closure_init(&calld->hc_on_recv, hc_on_recv, elem); |
| if (initial_op) hc_mutate_op(elem, initial_op); |
| } |
| |
| /* Destructor for call_data */ |
| static void destroy_call_elem(grpc_call_element *elem) { |
| /* grab pointers to our data from the call element */ |
| call_data *calld = elem->call_data; |
| channel_data *channeld = elem->channel_data; |
| |
| ignore_unused(calld); |
| ignore_unused(channeld); |
| } |
| |
| static const char *scheme_from_args(const grpc_channel_args *args) { |
| unsigned i; |
| 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) { |
| return args->args[i].value.string; |
| } |
| } |
| } |
| return "http"; |
| } |
| |
| static grpc_mdstr *user_agent_from_args(grpc_mdctx *mdctx, |
| 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(mdctx, tmp, 0); |
| gpr_free(tmp); |
| |
| return result; |
| } |
| |
| /* Constructor for channel_data */ |
| static void init_channel_elem(grpc_channel_element *elem, grpc_channel *master, |
| const grpc_channel_args *channel_args, |
| grpc_mdctx *mdctx, int is_first, int is_last) { |
| /* grab pointers to our data from the channel element */ |
| channel_data *channeld = elem->channel_data; |
| |
| /* The first and the last filters tend to be implemented differently to |
| handle the case that there's no 'next' filter to call on the up or down |
| path */ |
| GPR_ASSERT(!is_last); |
| |
| /* initialize members */ |
| channeld->te_trailers = grpc_mdelem_from_strings(mdctx, "te", "trailers"); |
| channeld->method = grpc_mdelem_from_strings(mdctx, ":method", "POST"); |
| channeld->scheme = grpc_mdelem_from_strings(mdctx, ":scheme", |
| scheme_from_args(channel_args)); |
| channeld->content_type = |
| grpc_mdelem_from_strings(mdctx, "content-type", "application/grpc"); |
| channeld->status = grpc_mdelem_from_strings(mdctx, ":status", "200"); |
| channeld->user_agent = grpc_mdelem_from_metadata_strings( |
| mdctx, grpc_mdstr_from_string(mdctx, "user-agent", 0), |
| user_agent_from_args(mdctx, channel_args)); |
| } |
| |
| /* Destructor for channel data */ |
| static void destroy_channel_elem(grpc_channel_element *elem) { |
| /* grab pointers to our data from the channel element */ |
| channel_data *channeld = elem->channel_data; |
| |
| GRPC_MDELEM_UNREF(channeld->te_trailers); |
| GRPC_MDELEM_UNREF(channeld->method); |
| GRPC_MDELEM_UNREF(channeld->scheme); |
| GRPC_MDELEM_UNREF(channeld->content_type); |
| GRPC_MDELEM_UNREF(channeld->status); |
| GRPC_MDELEM_UNREF(channeld->user_agent); |
| } |
| |
| const grpc_channel_filter grpc_http_client_filter = { |
| hc_start_transport_op, grpc_channel_next_op, sizeof(call_data), |
| init_call_elem, destroy_call_elem, sizeof(channel_data), |
| init_channel_elem, destroy_channel_elem, grpc_call_next_get_peer, |
| "http-client"}; |