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//
// 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 "src/core/ext/filters/http/client/http_client_filter.h"
#include <algorithm>
#include <functional>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_format.h"
#include "absl/strings/str_join.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include <grpc/grpc.h>
#include <grpc/impl/channel_arg_names.h>
#include <grpc/status.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/promise/context.h"
#include "src/core/lib/promise/latch.h"
#include "src/core/lib/promise/map.h"
#include "src/core/lib/promise/pipe.h"
#include "src/core/lib/promise/race.h"
#include "src/core/lib/resource_quota/arena.h"
#include "src/core/lib/slice/percent_encoding.h"
#include "src/core/lib/transport/status_conversion.h"
#include "src/core/lib/transport/transport.h"
namespace grpc_core {
const NoInterceptor HttpClientFilter::Call::OnServerToClientMessage;
const NoInterceptor HttpClientFilter::Call::OnClientToServerMessage;
const NoInterceptor HttpClientFilter::Call::OnFinalize;
const grpc_channel_filter HttpClientFilter::kFilter =
MakePromiseBasedFilter<HttpClientFilter, FilterEndpoint::kClient,
kFilterExaminesServerInitialMetadata>("http-client");
namespace {
absl::Status CheckServerMetadata(ServerMetadata* b) {
if (auto* status = b->get_pointer(HttpStatusMetadata())) {
// 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.
//
const grpc_status_code* grpc_status = b->get_pointer(GrpcStatusMetadata());
if (grpc_status != nullptr || *status == 200) {
b->Remove(HttpStatusMetadata());
} else {
return absl::Status(
static_cast<absl::StatusCode>(
grpc_http2_status_to_grpc_status(*status)),
absl::StrCat("Received http2 header with status: ", *status));
}
}
if (Slice* grpc_message = b->get_pointer(GrpcMessageMetadata())) {
*grpc_message = PermissivePercentDecodeSlice(std::move(*grpc_message));
}
b->Remove(ContentTypeMetadata());
return absl::OkStatus();
}
HttpSchemeMetadata::ValueType SchemeFromArgs(const ChannelArgs& args) {
HttpSchemeMetadata::ValueType scheme = HttpSchemeMetadata::Parse(
args.GetString(GRPC_ARG_HTTP2_SCHEME).value_or(""),
[](absl::string_view, const Slice&) {});
if (scheme == HttpSchemeMetadata::kInvalid) return HttpSchemeMetadata::kHttp;
return scheme;
}
Slice UserAgentFromArgs(const ChannelArgs& args,
absl::string_view transport_name) {
std::vector<std::string> fields;
auto add = [&fields](absl::string_view x) {
if (!x.empty()) fields.push_back(std::string(x));
};
add(args.GetString(GRPC_ARG_PRIMARY_USER_AGENT_STRING).value_or(""));
add(absl::StrFormat("grpc-c/%s (%s; %s)", grpc_version_string(),
GPR_PLATFORM_STRING, transport_name));
add(args.GetString(GRPC_ARG_SECONDARY_USER_AGENT_STRING).value_or(""));
return Slice::FromCopiedString(absl::StrJoin(fields, " "));
}
} // namespace
void HttpClientFilter::Call::OnClientInitialMetadata(ClientMetadata& md,
HttpClientFilter* filter) {
if (filter->test_only_use_put_requests_) {
md.Set(HttpMethodMetadata(), HttpMethodMetadata::kPut);
} else {
md.Set(HttpMethodMetadata(), HttpMethodMetadata::kPost);
}
md.Set(HttpSchemeMetadata(), filter->scheme_);
md.Set(TeMetadata(), TeMetadata::kTrailers);
md.Set(ContentTypeMetadata(), ContentTypeMetadata::kApplicationGrpc);
md.Set(UserAgentMetadata(), filter->user_agent_.Ref());
}
absl::Status HttpClientFilter::Call::OnServerInitialMetadata(
ServerMetadata& md) {
return CheckServerMetadata(&md);
}
absl::Status HttpClientFilter::Call::OnServerTrailingMetadata(
ServerMetadata& md) {
return CheckServerMetadata(&md);
}
HttpClientFilter::HttpClientFilter(HttpSchemeMetadata::ValueType scheme,
Slice user_agent,
bool test_only_use_put_requests)
: scheme_(scheme),
user_agent_(std::move(user_agent)),
test_only_use_put_requests_(test_only_use_put_requests) {}
absl::StatusOr<HttpClientFilter> HttpClientFilter::Create(
const ChannelArgs& args, ChannelFilter::Args) {
auto* transport = args.GetObject<Transport>();
if (transport == nullptr) {
return absl::InvalidArgumentError("HttpClientFilter needs a transport");
}
return HttpClientFilter(
SchemeFromArgs(args),
UserAgentFromArgs(args, transport->GetTransportName()),
args.GetInt(GRPC_ARG_TEST_ONLY_USE_PUT_REQUESTS).value_or(false));
}
} // namespace grpc_core
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