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//
//
// Copyright 2023 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/cpp/ext/csm/csm_observability.h"
#include <memory>
#include <string>
#include <utility>
#include "absl/functional/any_invocable.h"
#include "absl/status/statusor.h"
#include "absl/types/optional.h"
#include "google/cloud/opentelemetry/resource_detector.h"
#include "opentelemetry/sdk/metrics/meter_provider.h"
#include "opentelemetry/sdk/resource/resource.h"
#include "opentelemetry/sdk/resource/resource_detector.h"
#include <grpc/support/log.h>
#include <grpcpp/ext/csm_observability.h>
#include "src/core/ext/xds/xds_enabled_server.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/uri/uri_parser.h"
#include "src/cpp/ext/csm/metadata_exchange.h"
#include "src/cpp/ext/otel/otel_plugin.h"
namespace grpc {
namespace internal {
bool CsmServerSelector(const grpc_core::ChannelArgs& args) {
return args.GetBool(GRPC_ARG_XDS_ENABLED_SERVER).value_or(false);
}
bool CsmChannelTargetSelector(absl::string_view target) {
auto uri = grpc_core::URI::Parse(target);
if (!uri.ok()) {
gpr_log(GPR_ERROR, "Failed to parse URI: %s", std::string(target).c_str());
return false;
}
// CSM channels should have an "xds" scheme
if (uri->scheme() != "xds") {
return false;
}
// If set, the authority should be TD
if (!uri->authority().empty() &&
uri->authority() != "traffic-director-global.xds.googleapis.com") {
return false;
}
return true;
}
class CsmOpenTelemetryPluginOption
: public grpc::internal::InternalOpenTelemetryPluginOption {
public:
CsmOpenTelemetryPluginOption()
: labels_injector_(std::make_unique<internal::ServiceMeshLabelsInjector>(
google::cloud::otel::MakeResourceDetector()
->Detect()
.GetAttributes())) {}
bool IsActiveOnClientChannel(absl::string_view target) const override {
return CsmChannelTargetSelector(target);
}
bool IsActiveOnServer(const grpc_core::ChannelArgs& args) const override {
return CsmServerSelector(args);
}
const grpc::internal::LabelsInjector* labels_injector() const override {
return labels_injector_.get();
}
private:
std::unique_ptr<internal::ServiceMeshLabelsInjector> labels_injector_;
};
} // namespace internal
namespace experimental {
//
// CsmObservabilityBuilder
//
CsmObservabilityBuilder::CsmObservabilityBuilder()
: builder_(
std::make_unique<grpc::internal::OpenTelemetryPluginBuilderImpl>()) {}
CsmObservabilityBuilder::~CsmObservabilityBuilder() = default;
CsmObservabilityBuilder& CsmObservabilityBuilder::SetMeterProvider(
std::shared_ptr<opentelemetry::sdk::metrics::MeterProvider>
meter_provider) {
builder_->SetMeterProvider(meter_provider);
return *this;
}
CsmObservabilityBuilder& CsmObservabilityBuilder::SetTargetAttributeFilter(
absl::AnyInvocable<bool(absl::string_view /*target*/) const>
target_attribute_filter) {
builder_->SetTargetAttributeFilter(std::move(target_attribute_filter));
return *this;
}
CsmObservabilityBuilder&
CsmObservabilityBuilder::SetGenericMethodAttributeFilter(
absl::AnyInvocable<bool(absl::string_view /*generic_method*/) const>
generic_method_attribute_filter) {
builder_->SetGenericMethodAttributeFilter(
std::move(generic_method_attribute_filter));
return *this;
}
absl::StatusOr<CsmObservability> CsmObservabilityBuilder::BuildAndRegister() {
builder_->SetServerSelector(internal::CsmServerSelector);
builder_->SetTargetSelector(internal::CsmChannelTargetSelector);
builder_->SetLabelsInjector(
std::make_unique<internal::ServiceMeshLabelsInjector>(
google::cloud::otel::MakeResourceDetector()
->Detect()
.GetAttributes()));
builder_->BuildAndRegisterGlobal();
return CsmObservability();
}
std::unique_ptr<OpenTelemetryPluginOption> MakeCsmOpenTelemetryPluginOption() {
return std::make_unique<grpc::internal::CsmOpenTelemetryPluginOption>();
}
} // namespace experimental
} // namespace grpc
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