--- /dev/null
+/*
+ * 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 eligible 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_core::CallCombiner* 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_static_value_eq(b->idx.named.status->md,
+ GRPC_MDELEM_STATUS_200)) {
+ grpc_metadata_batch_remove(b, GRPC_BATCH_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_static_value_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, GRPC_BATCH_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_core::UnmanagedMemorySlice path_with_query_slice(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, 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, GRPC_BATCH_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, GRPC_BATCH_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, GRPC_BATCH_TE);
+ 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,
+ GRPC_BATCH_CONTENT_TYPE);
+ 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),
+ GRPC_BATCH_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_core::ManagedMemorySlice 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;
+
+ 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);
+ grpc_core::ManagedMemorySlice result(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"};
git://repos.xcallymotion.com / motion2.git / blobdiff