| /* |
| * 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 <grpc/support/port_platform.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include "src/core/ext/filters/http/client/http_client_filter.h" |
| #include "src/core/lib/gpr/string.h" |
| #include "src/core/lib/gprpp/manual_constructor.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/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 constexpr size_t kMaxPayloadSizeForGet = 2048; |
| |
| static void recv_initial_metadata_ready(void* user_data, grpc_error* error); |
| static void recv_trailing_metadata_ready(void* user_data, grpc_error* error); |
| static void on_send_message_next_done(void* arg, grpc_error* error); |
| static void send_message_on_complete(void* arg, grpc_error* error); |
| |
| namespace { |
| struct call_data { |
| call_data(grpc_call_element* elem, const grpc_call_element_args& args) |
| : call_combiner(args.call_combiner) { |
| GRPC_CLOSURE_INIT(&recv_initial_metadata_ready, |
| ::recv_initial_metadata_ready, elem, |
| grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&recv_trailing_metadata_ready, |
| ::recv_trailing_metadata_ready, elem, |
| grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&on_send_message_next_done, ::on_send_message_next_done, |
| elem, grpc_schedule_on_exec_ctx); |
| GRPC_CLOSURE_INIT(&send_message_on_complete, ::send_message_on_complete, |
| elem, grpc_schedule_on_exec_ctx); |
| } |
| |
| ~call_data() { GRPC_ERROR_UNREF(recv_initial_metadata_error); } |
| |
| 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_error* recv_initial_metadata_error = GRPC_ERROR_NONE; |
| grpc_closure* original_recv_initial_metadata_ready = nullptr; |
| 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_ready; |
| grpc_closure recv_trailing_metadata_ready; |
| grpc_error* recv_trailing_metadata_error = GRPC_ERROR_NONE; |
| bool seen_recv_trailing_metadata_ready = false; |
| // State for handling send_message ops. |
| grpc_transport_stream_op_batch* send_message_batch; |
| size_t send_message_bytes_read = 0; |
| grpc_core::ManualConstructor<grpc_core::ByteStreamCache> send_message_cache; |
| grpc_core::ManualConstructor<grpc_core::ByteStreamCache::CachingByteStream> |
| send_message_caching_stream; |
| grpc_closure on_send_message_next_done; |
| grpc_closure* original_send_message_on_complete; |
| grpc_closure send_message_on_complete; |
| }; |
| |
| struct channel_data { |
| grpc_mdelem static_scheme; |
| grpc_mdelem user_agent; |
| size_t max_payload_size_for_get; |
| }; |
| } // namespace |
| |
| static grpc_error* client_filter_incoming_metadata(grpc_call_element* elem, |
| grpc_metadata_batch* b) { |
| if (b->idx.named.status != nullptr) { |
| /* If both gRPC status and HTTP status are provided in the response, we |
| * should prefer the gRPC status code, as mentioned in |
| * https://github.com/grpc/grpc/blob/master/doc/http-grpc-status-mapping.md. |
| */ |
| if (b->idx.named.grpc_status != nullptr || |
| grpc_mdelem_eq(b->idx.named.status->md, GRPC_MDELEM_STATUS_200)) { |
| grpc_metadata_batch_remove(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 != nullptr) { |
| 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(pct_decoded_msg); |
| } else { |
| grpc_metadata_batch_set_value(b->idx.named.grpc_message, pct_decoded_msg); |
| } |
| } |
| |
| if (b->idx.named.content_type != nullptr) { |
| 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(b, b->idx.named.content_type); |
| } |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| static void recv_initial_metadata_ready(void* user_data, grpc_error* error) { |
| grpc_call_element* elem = static_cast<grpc_call_element*>(user_data); |
| call_data* calld = static_cast<call_data*>(elem->call_data); |
| if (error == GRPC_ERROR_NONE) { |
| error = client_filter_incoming_metadata(elem, calld->recv_initial_metadata); |
| calld->recv_initial_metadata_error = GRPC_ERROR_REF(error); |
| } else { |
| GRPC_ERROR_REF(error); |
| } |
| grpc_closure* closure = calld->original_recv_initial_metadata_ready; |
| calld->original_recv_initial_metadata_ready = nullptr; |
| if (calld->seen_recv_trailing_metadata_ready) { |
| GRPC_CALL_COMBINER_START( |
| calld->call_combiner, &calld->recv_trailing_metadata_ready, |
| calld->recv_trailing_metadata_error, "continue recv_trailing_metadata"); |
| } |
| GRPC_CLOSURE_RUN(closure, error); |
| } |
| |
| static void recv_trailing_metadata_ready(void* user_data, grpc_error* error) { |
| grpc_call_element* elem = static_cast<grpc_call_element*>(user_data); |
| call_data* calld = static_cast<call_data*>(elem->call_data); |
| if (calld->original_recv_initial_metadata_ready != nullptr) { |
| calld->recv_trailing_metadata_error = GRPC_ERROR_REF(error); |
| calld->seen_recv_trailing_metadata_ready = true; |
| GRPC_CALL_COMBINER_STOP(calld->call_combiner, |
| "deferring recv_trailing_metadata_ready until " |
| "after recv_initial_metadata_ready"); |
| return; |
| } |
| if (error == GRPC_ERROR_NONE) { |
| error = |
| client_filter_incoming_metadata(elem, calld->recv_trailing_metadata); |
| } else { |
| GRPC_ERROR_REF(error); |
| } |
| error = grpc_error_add_child( |
| error, GRPC_ERROR_REF(calld->recv_initial_metadata_error)); |
| GRPC_CLOSURE_RUN(calld->original_recv_trailing_metadata_ready, error); |
| } |
| |
| static void send_message_on_complete(void* arg, grpc_error* error) { |
| grpc_call_element* elem = static_cast<grpc_call_element*>(arg); |
| call_data* calld = static_cast<call_data*>(elem->call_data); |
| calld->send_message_cache.Destroy(); |
| GRPC_CLOSURE_RUN(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(call_data* calld) { |
| grpc_slice incoming_slice; |
| grpc_error* error = calld->send_message_caching_stream->Pull(&incoming_slice); |
| if (error == GRPC_ERROR_NONE) { |
| calld->send_message_bytes_read += GRPC_SLICE_LENGTH(incoming_slice); |
| grpc_slice_unref_internal(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->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(call_data* calld) { |
| while (calld->send_message_caching_stream->Next( |
| SIZE_MAX, &calld->on_send_message_next_done)) { |
| grpc_error* error = pull_slice_from_send_message(calld); |
| if (error != GRPC_ERROR_NONE) return error; |
| if (calld->send_message_bytes_read == |
| calld->send_message_caching_stream->length()) { |
| break; |
| } |
| } |
| return GRPC_ERROR_NONE; |
| } |
| |
| // Async callback for ByteStream::Next(). |
| static void on_send_message_next_done(void* arg, grpc_error* error) { |
| grpc_call_element* elem = static_cast<grpc_call_element*>(arg); |
| call_data* calld = static_cast<call_data*>(elem->call_data); |
| if (error != GRPC_ERROR_NONE) { |
| grpc_transport_stream_op_batch_finish_with_failure( |
| calld->send_message_batch, error, calld->call_combiner); |
| return; |
| } |
| error = pull_slice_from_send_message(calld); |
| if (error != GRPC_ERROR_NONE) { |
| grpc_transport_stream_op_batch_finish_with_failure( |
| 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. |
| calld->send_message_caching_stream->Reset(); |
| grpc_call_next_op(elem, calld->send_message_batch); |
| } |
| |
| static char* slice_buffer_to_string(grpc_slice_buffer* slice_buffer) { |
| char* payload_bytes = |
| static_cast<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_call_element* elem, |
| grpc_transport_stream_op_batch* batch) { |
| call_data* calld = static_cast<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 = |
| reinterpret_cast<char*> GRPC_SLICE_START_PTR(path_with_query_slice); |
| char* original_path = |
| reinterpret_cast<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(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 = reinterpret_cast<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(GRPC_MDSTR_PATH, path_with_query_slice); |
| grpc_metadata_batch* b = |
| batch->payload->send_initial_metadata.send_initial_metadata; |
| return grpc_metadata_batch_substitute(b, b->idx.named.path, |
| mdelem_path_and_query); |
| } |
| |
| static void remove_if_present(grpc_metadata_batch* batch, |
| grpc_metadata_batch_callouts_index idx) { |
| if (batch->idx.array[idx] != nullptr) { |
| grpc_metadata_batch_remove(batch, batch->idx.array[idx]); |
| } |
| } |
| |
| static void hc_start_transport_stream_op_batch( |
| grpc_call_element* elem, grpc_transport_stream_op_batch* batch) { |
| call_data* calld = static_cast<call_data*>(elem->call_data); |
| channel_data* channeld = static_cast<channel_data*>(elem->channel_data); |
| GPR_TIMER_SCOPE("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_ready = |
| batch->payload->recv_trailing_metadata.recv_trailing_metadata_ready; |
| batch->payload->recv_trailing_metadata.recv_trailing_metadata_ready = |
| &calld->recv_trailing_metadata_ready; |
| } |
| |
| 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; |
| calld->send_message_cache.Init( |
| std::move(batch->payload->send_message.send_message)); |
| calld->send_message_caching_stream.Init(calld->send_message_cache.get()); |
| batch->payload->send_message.send_message.reset( |
| calld->send_message_caching_stream.get()); |
| 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(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->length()) { |
| method = GRPC_MDELEM_METHOD_GET; |
| error = update_path_for_get(elem, batch); |
| if (error != GRPC_ERROR_NONE) goto done; |
| batch->send_message = false; |
| calld->send_message_caching_stream->Orphan(); |
| } 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( |
| batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_METHOD); |
| remove_if_present( |
| batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_SCHEME); |
| remove_if_present( |
| batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_TE); |
| remove_if_present( |
| batch->payload->send_initial_metadata.send_initial_metadata, |
| GRPC_BATCH_CONTENT_TYPE); |
| remove_if_present( |
| 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( |
| batch->payload->send_initial_metadata.send_initial_metadata, |
| &calld->method, method); |
| if (error != GRPC_ERROR_NONE) goto done; |
| error = grpc_metadata_batch_add_head( |
| 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( |
| 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( |
| 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( |
| 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( |
| calld->send_message_batch, error, calld->call_combiner); |
| } else if (!batch_will_be_handled_asynchronously) { |
| grpc_call_next_op(elem, batch); |
| } |
| } |
| |
| /* Constructor for call_data */ |
| static grpc_error* init_call_elem(grpc_call_element* elem, |
| const grpc_call_element_args* args) { |
| new (elem->call_data) call_data(elem, *args); |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for call_data */ |
| static void destroy_call_elem(grpc_call_element* elem, |
| const grpc_call_final_info* final_info, |
| grpc_closure* ignored) { |
| call_data* calld = static_cast<call_data*>(elem->call_data); |
| calld->~call_data(); |
| } |
| |
| 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 != nullptr) { |
| 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 != nullptr) { |
| 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 static_cast<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, nullptr); |
| 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_channel_element* elem, |
| grpc_channel_element_args* args) { |
| channel_data* chand = static_cast<channel_data*>(elem->channel_data); |
| GPR_ASSERT(!args->is_last); |
| GPR_ASSERT(args->optional_transport != nullptr); |
| 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( |
| 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_channel_element* elem) { |
| channel_data* chand = static_cast<channel_data*>(elem->channel_data); |
| GRPC_MDELEM_UNREF(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"}; |
