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grpc_handler.go
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grpc_handler.go
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// Copyright (c) 2019 The Jaeger 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.
package shared
import (
"context"
"errors"
"fmt"
"io"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/jaegertracing/jaeger/model"
"github.com/jaegertracing/jaeger/proto-gen/storage_v1"
"github.com/jaegertracing/jaeger/storage/dependencystore"
"github.com/jaegertracing/jaeger/storage/spanstore"
)
const spanBatchSize = 1000
// GRPCHandler implements all methods of Remote Storage gRPC API.
type GRPCHandler struct {
// impl StoragePlugin
// ArchiveImpl ArchiveStoragePlugin
// StreamImpl StreamingSpanWriterPlugin
impl *GRPCHandlerStorageImpl
}
// GRPCHandlerStorageImpl contains accessors for various storage implementations needed by the handler.
type GRPCHandlerStorageImpl struct {
SpanReader func() spanstore.Reader
SpanWriter func() spanstore.Writer
DependencyReader func() dependencystore.Reader
ArchiveSpanReader func() spanstore.Reader
ArchiveSpanWriter func() spanstore.Writer
StreamingSpanWriter func() spanstore.Writer
}
// NewGRPCHandler creates a handler given individual storage implementations.
func NewGRPCHandler(impl *GRPCHandlerStorageImpl) *GRPCHandler {
return &GRPCHandler{impl: impl}
}
// NewGRPCHandler creates a handler given implementations grouped by plugin services.
func NewGRPCHandlerWithPlugins(
mainImpl StoragePlugin,
archiveImpl ArchiveStoragePlugin,
streamImpl StreamingSpanWriterPlugin,
) *GRPCHandler {
impl := &GRPCHandlerStorageImpl{
SpanReader: mainImpl.SpanReader,
SpanWriter: mainImpl.SpanWriter,
DependencyReader: mainImpl.DependencyReader,
ArchiveSpanReader: func() spanstore.Reader { return nil },
ArchiveSpanWriter: func() spanstore.Writer { return nil },
StreamingSpanWriter: func() spanstore.Writer { return nil },
}
if archiveImpl != nil {
impl.ArchiveSpanReader = archiveImpl.ArchiveSpanReader
impl.ArchiveSpanWriter = archiveImpl.ArchiveSpanWriter
}
if streamImpl != nil {
impl.StreamingSpanWriter = streamImpl.StreamingSpanWriter
}
return NewGRPCHandler(impl)
}
// Register registers the server as gRPC methods handler.
func (s *GRPCHandler) Register(ss *grpc.Server) error {
storage_v1.RegisterSpanReaderPluginServer(ss, s)
storage_v1.RegisterSpanWriterPluginServer(ss, s)
storage_v1.RegisterArchiveSpanReaderPluginServer(ss, s)
storage_v1.RegisterArchiveSpanWriterPluginServer(ss, s)
storage_v1.RegisterPluginCapabilitiesServer(ss, s)
storage_v1.RegisterDependenciesReaderPluginServer(ss, s)
storage_v1.RegisterStreamingSpanWriterPluginServer(ss, s)
return nil
}
// GetDependencies returns all interservice dependencies
func (s *GRPCHandler) GetDependencies(ctx context.Context, r *storage_v1.GetDependenciesRequest) (*storage_v1.GetDependenciesResponse, error) {
deps, err := s.impl.DependencyReader().GetDependencies(ctx, r.EndTime, r.EndTime.Sub(r.StartTime))
if err != nil {
return nil, err
}
return &storage_v1.GetDependenciesResponse{
Dependencies: deps,
}, nil
}
// WriteSpanStream receive the span from stream and save it
func (s *GRPCHandler) WriteSpanStream(stream storage_v1.StreamingSpanWriterPlugin_WriteSpanStreamServer) error {
writer := s.impl.StreamingSpanWriter()
if writer == nil {
return status.Error(codes.Unimplemented, "not implemented")
}
for {
in, err := stream.Recv()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
return err
}
err = writer.WriteSpan(stream.Context(), in.Span)
if err != nil {
return err
}
}
return stream.SendAndClose(&storage_v1.WriteSpanResponse{})
}
// WriteSpan saves the span
func (s *GRPCHandler) WriteSpan(ctx context.Context, r *storage_v1.WriteSpanRequest) (*storage_v1.WriteSpanResponse, error) {
err := s.impl.SpanWriter().WriteSpan(ctx, r.Span)
if err != nil {
return nil, err
}
return &storage_v1.WriteSpanResponse{}, nil
}
func (s *GRPCHandler) Close(ctx context.Context, r *storage_v1.CloseWriterRequest) (*storage_v1.CloseWriterResponse, error) {
if closer, ok := s.impl.SpanWriter().(io.Closer); ok {
if err := closer.Close(); err != nil {
return nil, err
}
return &storage_v1.CloseWriterResponse{}, nil
} else {
return nil, status.Error(codes.Unimplemented, "span writer does not support graceful shutdown")
}
}
// GetTrace takes a traceID and streams a Trace associated with that traceID
func (s *GRPCHandler) GetTrace(r *storage_v1.GetTraceRequest, stream storage_v1.SpanReaderPlugin_GetTraceServer) error {
trace, err := s.impl.SpanReader().GetTrace(stream.Context(), r.TraceID)
if errors.Is(err, spanstore.ErrTraceNotFound) {
return status.Errorf(codes.NotFound, spanstore.ErrTraceNotFound.Error())
}
if err != nil {
return err
}
err = s.sendSpans(trace.Spans, stream.Send)
if err != nil {
return err
}
return nil
}
// GetServices returns a list of all known services
func (s *GRPCHandler) GetServices(ctx context.Context, r *storage_v1.GetServicesRequest) (*storage_v1.GetServicesResponse, error) {
services, err := s.impl.SpanReader().GetServices(ctx)
if err != nil {
return nil, err
}
return &storage_v1.GetServicesResponse{
Services: services,
}, nil
}
// GetOperations returns the operations of a given service
func (s *GRPCHandler) GetOperations(
ctx context.Context,
r *storage_v1.GetOperationsRequest,
) (*storage_v1.GetOperationsResponse, error) {
operations, err := s.impl.SpanReader().GetOperations(ctx, spanstore.OperationQueryParameters{
ServiceName: r.Service,
SpanKind: r.SpanKind,
})
if err != nil {
return nil, err
}
grpcOperation := make([]*storage_v1.Operation, len(operations))
for i, operation := range operations {
grpcOperation[i] = &storage_v1.Operation{
Name: operation.Name,
SpanKind: operation.SpanKind,
}
}
return &storage_v1.GetOperationsResponse{
Operations: grpcOperation,
}, nil
}
// FindTraces streams traces that match the traceQuery
func (s *GRPCHandler) FindTraces(r *storage_v1.FindTracesRequest, stream storage_v1.SpanReaderPlugin_FindTracesServer) error {
traces, err := s.impl.SpanReader().FindTraces(stream.Context(), &spanstore.TraceQueryParameters{
ServiceName: r.Query.ServiceName,
OperationName: r.Query.OperationName,
Tags: r.Query.Tags,
StartTimeMin: r.Query.StartTimeMin,
StartTimeMax: r.Query.StartTimeMax,
DurationMin: r.Query.DurationMin,
DurationMax: r.Query.DurationMax,
NumTraces: int(r.Query.NumTraces),
})
if err != nil {
return err
}
for _, trace := range traces {
err = s.sendSpans(trace.Spans, stream.Send)
if err != nil {
return err
}
}
return nil
}
// FindTraceIDs retrieves traceIDs that match the traceQuery
func (s *GRPCHandler) FindTraceIDs(ctx context.Context, r *storage_v1.FindTraceIDsRequest) (*storage_v1.FindTraceIDsResponse, error) {
traceIDs, err := s.impl.SpanReader().FindTraceIDs(ctx, &spanstore.TraceQueryParameters{
ServiceName: r.Query.ServiceName,
OperationName: r.Query.OperationName,
Tags: r.Query.Tags,
StartTimeMin: r.Query.StartTimeMin,
StartTimeMax: r.Query.StartTimeMax,
DurationMin: r.Query.DurationMin,
DurationMax: r.Query.DurationMax,
NumTraces: int(r.Query.NumTraces),
})
if err != nil {
return nil, err
}
return &storage_v1.FindTraceIDsResponse{
TraceIDs: traceIDs,
}, nil
}
func (s *GRPCHandler) sendSpans(spans []*model.Span, sendFn func(*storage_v1.SpansResponseChunk) error) error {
chunk := make([]model.Span, 0, len(spans))
for i := 0; i < len(spans); i += spanBatchSize {
chunk = chunk[:0]
for j := i; j < len(spans) && j < i+spanBatchSize; j++ {
chunk = append(chunk, *spans[j])
}
if err := sendFn(&storage_v1.SpansResponseChunk{Spans: chunk}); err != nil {
return fmt.Errorf("grpc plugin failed to send response: %w", err)
}
}
return nil
}
func (s *GRPCHandler) Capabilities(ctx context.Context, request *storage_v1.CapabilitiesRequest) (*storage_v1.CapabilitiesResponse, error) {
return &storage_v1.CapabilitiesResponse{
ArchiveSpanReader: s.impl.ArchiveSpanReader() != nil,
ArchiveSpanWriter: s.impl.ArchiveSpanWriter() != nil,
StreamingSpanWriter: s.impl.StreamingSpanWriter() != nil,
}, nil
}
func (s *GRPCHandler) GetArchiveTrace(r *storage_v1.GetTraceRequest, stream storage_v1.ArchiveSpanReaderPlugin_GetArchiveTraceServer) error {
reader := s.impl.ArchiveSpanReader()
if reader == nil {
return status.Error(codes.Unimplemented, "not implemented")
}
trace, err := reader.GetTrace(stream.Context(), r.TraceID)
if errors.Is(err, spanstore.ErrTraceNotFound) {
return status.Errorf(codes.NotFound, spanstore.ErrTraceNotFound.Error())
}
if err != nil {
return err
}
err = s.sendSpans(trace.Spans, stream.Send)
if err != nil {
return err
}
return nil
}
func (s *GRPCHandler) WriteArchiveSpan(ctx context.Context, r *storage_v1.WriteSpanRequest) (*storage_v1.WriteSpanResponse, error) {
writer := s.impl.ArchiveSpanWriter()
if writer == nil {
return nil, status.Error(codes.Unimplemented, "not implemented")
}
err := writer.WriteSpan(ctx, r.Span)
if err != nil {
return nil, err
}
return &storage_v1.WriteSpanResponse{}, nil
}