| /* |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include "src/core/ext/filters/http/client/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/slice/b64.h" |
| #include "src/core/lib/slice/percent_encoding.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| #include "src/core/lib/slice/slice_string_helpers.h" |
| #include "src/core/lib/support/string.h" |
| #include "src/core/lib/transport/static_metadata.h" |
| #include "src/core/lib/transport/transport_impl.h" |
| |
| #define EXPECTED_CONTENT_TYPE "application/grpc" |
| #define EXPECTED_CONTENT_TYPE_LENGTH sizeof(EXPECTED_CONTENT_TYPE) - 1 |
| |
| /* default maximum size of payload eligable for GET request */ |
| static const size_t kMaxPayloadSizeForGet = 2048; |
| |
| typedef struct call_data { |
| grpc_call_combiner *call_combiner; |
| // State for handling send_initial_metadata ops. |
| 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; |
| // State for handling recv_initial_metadata ops. |
| grpc_metadata_batch *recv_initial_metadata; |
| grpc_closure *original_recv_initial_metadata_ready; |
| grpc_closure recv_initial_metadata_ready; |
| // State for handling recv_trailing_metadata ops. |
| grpc_metadata_batch *recv_trailing_metadata; |
| grpc_closure *original_recv_trailing_metadata_on_complete; |
| grpc_closure recv_trailing_metadata_on_complete; |
| // State for handling send_message ops. |
| grpc_transport_stream_op_batch *send_message_batch; |
| size_t send_message_bytes_read; |
| grpc_byte_stream_cache send_message_cache; |
| grpc_caching_byte_stream send_message_caching_stream; |
| grpc_closure on_send_message_next_done; |
| grpc_closure *original_send_message_on_complete; |
| grpc_closure send_message_on_complete; |
| } call_data; |
| |
| typedef struct channel_data { |
| grpc_mdelem static_scheme; |
| grpc_mdelem user_agent; |
| size_t max_payload_size_for_get; |
| } channel_data; |
| |
| static grpc_error *client_filter_incoming_metadata(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| grpc_metadata_batch *b) { |
| if (b->idx.named.status != NULL) { |
| if (grpc_mdelem_eq(b->idx.named.status->md, GRPC_MDELEM_STATUS_200)) { |
| grpc_metadata_batch_remove(exec_ctx, b, b->idx.named.status); |
| } else { |
| char *val = grpc_dump_slice(GRPC_MDVALUE(b->idx.named.status->md), |
| GPR_DUMP_ASCII); |
| char *msg; |
| gpr_asprintf(&msg, "Received http2 header with status: %s", val); |
| grpc_error *e = grpc_error_set_str( |
| grpc_error_set_int( |
| grpc_error_set_str( |
| GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "Received http2 :status header with non-200 OK status"), |
| GRPC_ERROR_STR_VALUE, grpc_slice_from_copied_string(val)), |
| GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_CANCELLED), |
| GRPC_ERROR_STR_GRPC_MESSAGE, grpc_slice_from_copied_string(msg)); |
| gpr_free(val); |
| gpr_free(msg); |
| return e; |
| } |
| } |
| |
| if (b->idx.named.grpc_message != NULL) { |
| grpc_slice pct_decoded_msg = grpc_permissive_percent_decode_slice( |
| GRPC_MDVALUE(b->idx.named.grpc_message->md)); |
| if (grpc_slice_is_equivalent(pct_decoded_msg, |
| GRPC_MDVALUE(b->idx.named.grpc_message->md))) { |
| grpc_slice_unref_internal(exec_ctx, pct_decoded_msg); |
| } else { |
| grpc_metadata_batch_set_value(exec_ctx, b->idx.named.grpc_message, |
| pct_decoded_msg); |
| } |
| } |
| |
| if (b->idx.named.content_type != NULL) { |
| if (!grpc_mdelem_eq(b->idx.named.content_type->md, |
| GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC)) { |
| if (grpc_slice_buf_start_eq(GRPC_MDVALUE(b->idx.named.content_type->md), |
| EXPECTED_CONTENT_TYPE, |
| EXPECTED_CONTENT_TYPE_LENGTH) && |
| (GRPC_SLICE_START_PTR(GRPC_MDVALUE( |
| b->idx.named.content_type->md))[EXPECTED_CONTENT_TYPE_LENGTH] == |
| '+' || |
| GRPC_SLICE_START_PTR(GRPC_MDVALUE( |
| b->idx.named.content_type->md))[EXPECTED_CONTENT_TYPE_LENGTH] == |
| ';')) { |
| /* Although the C implementation doesn't (currently) generate them, |
| any custom +-suffix is explicitly valid. */ |
| /* TODO(klempner): We should consider preallocating common values such |
| as +proto or +json, or at least stashing them if we see them. */ |
| /* TODO(klempner): Should we be surfacing this to application code? */ |
| } else { |
| /* TODO(klempner): We're currently allowing this, but we shouldn't |
| see it without a proxy so log for now. */ |
| char *val = grpc_dump_slice(GRPC_MDVALUE(b->idx.named.content_type->md), |
| GPR_DUMP_ASCII); |
| gpr_log(GPR_INFO, "Unexpected content-type '%s'", val); |
| gpr_free(val); |
| } |
| } |
| grpc_metadata_batch_remove(exec_ctx, b, b->idx.named.content_type); |
| } |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void recv_initial_metadata_ready(grpc_exec_ctx *exec_ctx, |
| void *user_data, grpc_error *error) { |
| grpc_call_element *elem = (grpc_call_element *)user_data; |
| call_data *calld = (call_data *)elem->call_data; |
| if (error == GRPC_ERROR_NONE) { |
| error = client_filter_incoming_metadata(exec_ctx, elem, |
| calld->recv_initial_metadata); |
| } else { |
| GRPC_ERROR_REF(error); |
| } |
| GRPC_CLOSURE_RUN(exec_ctx, calld->original_recv_initial_metadata_ready, |
| error); |
| } |
| |
| static void recv_trailing_metadata_on_complete(grpc_exec_ctx *exec_ctx, |
| void *user_data, |
| grpc_error *error) { |
| grpc_call_element *elem = (grpc_call_element *)user_data; |
| call_data *calld = (call_data *)elem->call_data; |
| if (error == GRPC_ERROR_NONE) { |
| error = client_filter_incoming_metadata(exec_ctx, elem, |
| calld->recv_trailing_metadata); |
| } else { |
| GRPC_ERROR_REF(error); |
| } |
| GRPC_CLOSURE_RUN(exec_ctx, calld->original_recv_trailing_metadata_on_complete, |
| error); |
| } |
| |
| static void send_message_on_complete(grpc_exec_ctx *exec_ctx, void *arg, |
| grpc_error *error) { |
| grpc_call_element *elem = (grpc_call_element *)arg; |
| call_data *calld = (call_data *)elem->call_data; |
| grpc_byte_stream_cache_destroy(exec_ctx, &calld->send_message_cache); |
| GRPC_CLOSURE_RUN(exec_ctx, calld->original_send_message_on_complete, |
| GRPC_ERROR_REF(error)); |
| } |
| |
| // Pulls a slice from the send_message byte stream, updating |
| // calld->send_message_bytes_read. |
| static grpc_error *pull_slice_from_send_message(grpc_exec_ctx *exec_ctx, |
| call_data *calld) { |
| grpc_slice incoming_slice; |
| grpc_error *error = grpc_byte_stream_pull( |
| exec_ctx, &calld->send_message_caching_stream.base, &incoming_slice); |
| if (error == GRPC_ERROR_NONE) { |
| calld->send_message_bytes_read += GRPC_SLICE_LENGTH(incoming_slice); |
| grpc_slice_unref_internal(exec_ctx, incoming_slice); |
| } |
| return error; |
| } |
| |
| // Reads as many slices as possible from the send_message byte stream. |
| // Upon successful return, if calld->send_message_bytes_read == |
| // calld->send_message_caching_stream.base.length, then we have completed |
| // reading from the byte stream; otherwise, an async read has been dispatched |
| // and on_send_message_next_done() will be invoked when it is complete. |
| static grpc_error *read_all_available_send_message_data(grpc_exec_ctx *exec_ctx, |
| call_data *calld) { |
| while (grpc_byte_stream_next(exec_ctx, |
| &calld->send_message_caching_stream.base, |
| ~(size_t)0, &calld->on_send_message_next_done)) { |
| grpc_error *error = pull_slice_from_send_message(exec_ctx, calld); |
| if (error != GRPC_ERROR_NONE) return error; |
| if (calld->send_message_bytes_read == |
| calld->send_message_caching_stream.base.length) { |
| break; |
| } |
| } |
| return GRPC_ERROR_NONE; |
| } |
| |
| // Async callback for grpc_byte_stream_next(). |
| static void on_send_message_next_done(grpc_exec_ctx *exec_ctx, void *arg, |
| grpc_error *error) { |
| grpc_call_element *elem = (grpc_call_element *)arg; |
| call_data *calld = (call_data *)elem->call_data; |
| if (error != GRPC_ERROR_NONE) { |
| grpc_transport_stream_op_batch_finish_with_failure( |
| exec_ctx, calld->send_message_batch, error, calld->call_combiner); |
| return; |
| } |
| error = pull_slice_from_send_message(exec_ctx, calld); |
| if (error != GRPC_ERROR_NONE) { |
| grpc_transport_stream_op_batch_finish_with_failure( |
| exec_ctx, calld->send_message_batch, error, calld->call_combiner); |
| return; |
| } |
| // There may or may not be more to read, but we don't care. If we got |
| // here, then we know that all of the data was not available |
| // synchronously, so we were not able to do a cached call. Instead, |
| // we just reset the byte stream and then send down the batch as-is. |
| grpc_caching_byte_stream_reset(&calld->send_message_caching_stream); |
| grpc_call_next_op(exec_ctx, elem, calld->send_message_batch); |
| } |
| |
| static char *slice_buffer_to_string(grpc_slice_buffer *slice_buffer) { |
| char *payload_bytes = (char *)gpr_malloc(slice_buffer->length + 1); |
| size_t offset = 0; |
| for (size_t i = 0; i < slice_buffer->count; ++i) { |
| memcpy(payload_bytes + offset, |
| GRPC_SLICE_START_PTR(slice_buffer->slices[i]), |
| GRPC_SLICE_LENGTH(slice_buffer->slices[i])); |
| offset += GRPC_SLICE_LENGTH(slice_buffer->slices[i]); |
| } |
| *(payload_bytes + offset) = '\0'; |
| return payload_bytes; |
| } |
| |
| // Modifies the path entry in the batch's send_initial_metadata to |
| // append the base64-encoded query for a GET request. |
| static grpc_error *update_path_for_get(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| grpc_transport_stream_op_batch *batch) { |
| call_data *calld = (call_data *)elem->call_data; |
| grpc_slice path_slice = |
| GRPC_MDVALUE(batch->payload->send_initial_metadata.send_initial_metadata |
| ->idx.named.path->md); |
| /* sum up individual component's lengths and allocate enough memory to |
| * hold combined path+query */ |
| size_t estimated_len = GRPC_SLICE_LENGTH(path_slice); |
| estimated_len++; /* for the '?' */ |
| estimated_len += grpc_base64_estimate_encoded_size( |
| batch->payload->send_message.send_message->length, true /* url_safe */, |
| false /* multi_line */); |
| grpc_slice path_with_query_slice = GRPC_SLICE_MALLOC(estimated_len); |
| /* memcopy individual pieces into this slice */ |
| char *write_ptr = (char *)GRPC_SLICE_START_PTR(path_with_query_slice); |
| char *original_path = (char *)GRPC_SLICE_START_PTR(path_slice); |
| memcpy(write_ptr, original_path, GRPC_SLICE_LENGTH(path_slice)); |
| write_ptr += GRPC_SLICE_LENGTH(path_slice); |
| *write_ptr++ = '?'; |
| char *payload_bytes = |
| slice_buffer_to_string(&calld->send_message_cache.cache_buffer); |
| grpc_base64_encode_core((char *)write_ptr, payload_bytes, |
| batch->payload->send_message.send_message->length, |
| true /* url_safe */, false /* multi_line */); |
| gpr_free(payload_bytes); |
| /* remove trailing unused memory and add trailing 0 to terminate string */ |
| char *t = (char *)GRPC_SLICE_START_PTR(path_with_query_slice); |
| /* safe to use strlen since base64_encode will always add '\0' */ |
| path_with_query_slice = |
| grpc_slice_sub_no_ref(path_with_query_slice, 0, strlen(t)); |
| /* substitute previous path with the new path+query */ |
| grpc_mdelem mdelem_path_and_query = |
| grpc_mdelem_from_slices(exec_ctx, GRPC_MDSTR_PATH, path_with_query_slice); |
| grpc_metadata_batch *b = |
| batch->payload->send_initial_metadata.send_initial_metadata; |
| return grpc_metadata_batch_substitute(exec_ctx, b, b->idx.named.path, |
| mdelem_path_and_query); |
| } |
| |
| static void remove_if_present(grpc_exec_ctx *exec_ctx, |
| grpc_metadata_batch *batch, |
| grpc_metadata_batch_callouts_index idx) { |
| if (batch->idx.array[idx] != NULL) { |
| grpc_metadata_batch_remove(exec_ctx, batch, batch->idx.array[idx]); |
| } |
| } |
| |
| static void hc_start_transport_stream_op_batch( |
| grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| grpc_transport_stream_op_batch *batch) { |
| call_data *calld = (call_data *)elem->call_data; |
| channel_data *channeld = (channel_data *)elem->channel_data; |
| GPR_TIMER_BEGIN("hc_start_transport_stream_op_batch", 0); |
| |
| if (batch->recv_initial_metadata) { |
| /* substitute our callback for the higher callback */ |
| calld->recv_initial_metadata = |
| batch->payload->recv_initial_metadata.recv_initial_metadata; |
| calld->original_recv_initial_metadata_ready = |
| batch->payload->recv_initial_metadata.recv_initial_metadata_ready; |
| batch->payload->recv_initial_metadata.recv_initial_metadata_ready = |
| &calld->recv_initial_metadata_ready; |
| } |
| |
| if (batch->recv_trailing_metadata) { |
| /* substitute our callback for the higher callback */ |
| calld->recv_trailing_metadata = |
| batch->payload->recv_trailing_metadata.recv_trailing_metadata; |
| calld->original_recv_trailing_metadata_on_complete = batch->on_complete; |
| batch->on_complete = &calld->recv_trailing_metadata_on_complete; |
| } |
| |
| grpc_error *error = GRPC_ERROR_NONE; |
| bool batch_will_be_handled_asynchronously = false; |
| if (batch->send_initial_metadata) { |
| // Decide which HTTP VERB to use. We use GET if the request is marked |
| // cacheable, and the operation contains both initial metadata and send |
| // message, and the payload is below the size threshold, and all the data |
| // for this request is immediately available. |
| grpc_mdelem method = GRPC_MDELEM_METHOD_POST; |
| if (batch->send_message && |
| (batch->payload->send_initial_metadata.send_initial_metadata_flags & |
| GRPC_INITIAL_METADATA_CACHEABLE_REQUEST) && |
| batch->payload->send_message.send_message->length < |
| channeld->max_payload_size_for_get) { |
| calld->send_message_bytes_read = 0; |
| grpc_byte_stream_cache_init(&calld->send_message_cache, |
| batch->payload->send_message.send_message); |
| grpc_caching_byte_stream_init(&calld->send_message_caching_stream, |
| &calld->send_message_cache); |
| batch->payload->send_message.send_message = |
| &calld->send_message_caching_stream.base; |
| calld->original_send_message_on_complete = batch->on_complete; |
| batch->on_complete = &calld->send_message_on_complete; |
| calld->send_message_batch = batch; |
| error = read_all_available_send_message_data(exec_ctx, calld); |
| if (error != GRPC_ERROR_NONE) goto done; |
| // If all the data has been read, then we can use GET. |
| if (calld->send_message_bytes_read == |
| calld->send_message_caching_stream.base.length) { |
| method = GRPC_MDELEM_METHOD_GET; |
| error = update_path_for_get(exec_ctx, elem, batch); |
| if (error != GRPC_ERROR_NONE) goto done; |
| batch->send_message = false; |
| grpc_byte_stream_destroy(exec_ctx, |
| &calld->send_message_caching_stream.base); |
| } else { |
| // Not all data is available. The batch will be sent down |
| // asynchronously in on_send_message_next_done(). |
| batch_will_be_handled_asynchronously = true; |
| // Fall back to POST. |
| gpr_log(GPR_DEBUG, |
| "Request is marked Cacheable but not all data is available. " |
| "Falling back to POST"); |
| } |
| } else if (batch->payload->send_initial_metadata |
| .send_initial_metadata_flags & |
| GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) { |
| method = GRPC_MDELEM_METHOD_PUT; |
| } |
| |
| remove_if_present( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_METHOD); |
| remove_if_present( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_SCHEME); |
| remove_if_present( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_TE); |
| remove_if_present( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_CONTENT_TYPE); |
| remove_if_present( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_USER_AGENT); |
| |
| /* Send : prefixed headers, which have to be before any application |
| layer headers. */ |
| error = grpc_metadata_batch_add_head( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| &calld->method, method); |
| if (error != GRPC_ERROR_NONE) goto done; |
| error = grpc_metadata_batch_add_head( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| &calld->scheme, channeld->static_scheme); |
| if (error != GRPC_ERROR_NONE) goto done; |
| error = grpc_metadata_batch_add_tail( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| &calld->te_trailers, GRPC_MDELEM_TE_TRAILERS); |
| if (error != GRPC_ERROR_NONE) goto done; |
| error = grpc_metadata_batch_add_tail( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| &calld->content_type, GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC); |
| if (error != GRPC_ERROR_NONE) goto done; |
| error = grpc_metadata_batch_add_tail( |
| exec_ctx, batch->payload->send_initial_metadata.send_initial_metadata, |
| &calld->user_agent, GRPC_MDELEM_REF(channeld->user_agent)); |
| if (error != GRPC_ERROR_NONE) goto done; |
| } |
| |
| done: |
| if (error != GRPC_ERROR_NONE) { |
| grpc_transport_stream_op_batch_finish_with_failure( |
| exec_ctx, calld->send_message_batch, error, calld->call_combiner); |
| } else if (!batch_will_be_handled_asynchronously) { |
| grpc_call_next_op(exec_ctx, elem, batch); |
| } |
| GPR_TIMER_END("hc_start_transport_stream_op_batch", 0); |
| } |
| |
| /* Constructor for call_data */ |
| static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| const grpc_call_element_args *args) { |
| call_data *calld = (call_data *)elem->call_data; |
| calld->call_combiner = args->call_combiner; |
| GRPC_CLOSURE_INIT(&calld->recv_initial_metadata_ready, |
| recv_initial_metadata_ready, elem, |
| grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&calld->recv_trailing_metadata_on_complete, |
| recv_trailing_metadata_on_complete, elem, |
| grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&calld->send_message_on_complete, send_message_on_complete, |
| elem, grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&calld->on_send_message_next_done, |
| on_send_message_next_done, elem, grpc_schedule_on_exec_ctx); |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for call_data */ |
| static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| const grpc_call_final_info *final_info, |
| grpc_closure *ignored) {} |
| |
| 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 == grpc_slice_str_cmp(GRPC_MDVALUE(valid_schemes[j]), |
| args->args[i].value.string)) { |
| return valid_schemes[j]; |
| } |
| } |
| } |
| } |
| } |
| return GRPC_MDELEM_SCHEME_HTTP; |
| } |
| |
| static size_t max_payload_size_from_args(const grpc_channel_args *args) { |
| if (args != NULL) { |
| for (size_t i = 0; i < args->num_args; ++i) { |
| if (0 == strcmp(args->args[i].key, GRPC_ARG_MAX_PAYLOAD_SIZE_FOR_GET)) { |
| if (args->args[i].type != GRPC_ARG_INTEGER) { |
| gpr_log(GPR_ERROR, "%s: must be an integer", |
| GRPC_ARG_MAX_PAYLOAD_SIZE_FOR_GET); |
| } else { |
| return (size_t)args->args[i].value.integer; |
| } |
| } |
| } |
| } |
| return kMaxPayloadSizeForGet; |
| } |
| |
| static grpc_slice user_agent_from_args(const grpc_channel_args *args, |
| const char *transport_name) { |
| gpr_strvec v; |
| size_t i; |
| int is_first = 1; |
| char *tmp; |
| grpc_slice 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; %s; %s)", is_first ? "" : " ", |
| grpc_version_string(), GPR_PLATFORM_STRING, transport_name, |
| grpc_g_stands_for()); |
| 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_slice_intern(grpc_slice_from_static_string(tmp)); |
| gpr_free(tmp); |
| |
| return result; |
| } |
| |
| /* Constructor for channel_data */ |
| static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem, |
| grpc_channel_element_args *args) { |
| channel_data *chand = (channel_data *)elem->channel_data; |
| GPR_ASSERT(!args->is_last); |
| GPR_ASSERT(args->optional_transport != NULL); |
| chand->static_scheme = scheme_from_args(args->channel_args); |
| chand->max_payload_size_for_get = |
| max_payload_size_from_args(args->channel_args); |
| chand->user_agent = grpc_mdelem_from_slices( |
| exec_ctx, GRPC_MDSTR_USER_AGENT, |
| user_agent_from_args(args->channel_args, |
| args->optional_transport->vtable->name)); |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for channel data */ |
| static void destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem) { |
| channel_data *chand = (channel_data *)elem->channel_data; |
| GRPC_MDELEM_UNREF(exec_ctx, chand->user_agent); |
| } |
| |
| const grpc_channel_filter grpc_http_client_filter = { |
| hc_start_transport_stream_op_batch, |
| grpc_channel_next_op, |
| sizeof(call_data), |
| init_call_elem, |
| grpc_call_stack_ignore_set_pollset_or_pollset_set, |
| destroy_call_elem, |
| sizeof(channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| grpc_channel_next_get_info, |
| "http-client"}; |