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config.go
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/
config.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 config
import (
"fmt"
"os/exec"
"runtime"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-plugin"
"github.com/jaegertracing/jaeger/plugin/storage/grpc/shared"
)
// Configuration describes the options to customize the storage behavior
type Configuration struct {
PluginBinary string `yaml:"binary"`
PluginConfigurationFile string `yaml:"configuration-file"`
}
// Build instantiates a StoragePlugin
func (c *Configuration) Build() (shared.StoragePlugin, error) {
// #nosec G204
cmd := exec.Command(c.PluginBinary, "--config", c.PluginConfigurationFile)
client := plugin.NewClient(&plugin.ClientConfig{
HandshakeConfig: shared.Handshake,
VersionedPlugins: map[int]plugin.PluginSet{
1: shared.PluginMap,
},
Cmd: cmd,
AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC},
Logger: hclog.New(&hclog.LoggerOptions{
Level: hclog.Warn,
}),
})
runtime.SetFinalizer(client, func(c *plugin.Client) {
c.Kill()
})
rpcClient, err := client.Client()
if err != nil {
return nil, fmt.Errorf("error attempting to connect to plugin rpc client: %s", err)
}
raw, err := rpcClient.Dispense(shared.StoragePluginIdentifier)
if err != nil {
return nil, fmt.Errorf("unable to retrieve storage plugin instance: %s", err)
}
storagePlugin, ok := raw.(shared.StoragePlugin)
if !ok {
return nil, fmt.Errorf("unexpected type for plugin \"%s\"", shared.StoragePluginIdentifier)
}
return storagePlugin, nil
}
// PluginBuilder is used to create storage plugins
type PluginBuilder interface {
Build() (shared.StoragePlugin, error)
}