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interface.go
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interface.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"
"github.com/hashicorp/go-plugin"
"google.golang.org/grpc"
"github.com/jaegertracing/jaeger/proto-gen/storage_v1"
"github.com/jaegertracing/jaeger/storage/dependencystore"
"github.com/jaegertracing/jaeger/storage/spanstore"
)
// StoragePluginIdentifier is the identifier that is shared by plugin and host.
const StoragePluginIdentifier = "storage_plugin"
// Handshake is a common handshake that is shared by plugin and host.
var Handshake = plugin.HandshakeConfig{
MagicCookieKey: "STORAGE_PLUGIN",
MagicCookieValue: "jaeger",
}
// PluginMap is the map of plugins we can dispense.
var PluginMap = map[string]plugin.Plugin{
StoragePluginIdentifier: &StorageGRPCPlugin{},
}
// StoragePlugin is the interface we're exposing as a plugin.
type StoragePlugin interface {
SpanReader() spanstore.Reader
SpanWriter() spanstore.Writer
DependencyReader() dependencystore.Reader
}
// StorageGRPCPlugin is the implementation of plugin.GRPCPlugin so we can serve/consume this.
type StorageGRPCPlugin struct {
plugin.Plugin
// Concrete implementation, written in Go. This is only used for plugins
// that are written in Go.
Impl StoragePlugin
}
// GRPCServer is used by go-plugin to create a grpc plugin server
func (p *StorageGRPCPlugin) GRPCServer(broker *plugin.GRPCBroker, s *grpc.Server) error {
server := &grpcServer{Impl: p.Impl}
storage_v1.RegisterSpanReaderPluginServer(s, server)
storage_v1.RegisterSpanWriterPluginServer(s, server)
storage_v1.RegisterDependenciesReaderPluginServer(s, server)
return nil
}
// GRPCClient is used by go-plugin to create a grpc plugin client
func (*StorageGRPCPlugin) GRPCClient(ctx context.Context, broker *plugin.GRPCBroker, c *grpc.ClientConn) (interface{}, error) {
return &grpcClient{
readerClient: storage_v1.NewSpanReaderPluginClient(c),
writerClient: storage_v1.NewSpanWriterPluginClient(c),
depsReaderClient: storage_v1.NewDependenciesReaderPluginClient(c),
}, nil
}