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package main
import (
"encoding/json"
"io/ioutil"
"github.com/hashicorp/go-plugin"
"github.com/hashicorp/go-plugin/examples/bidirectional/shared"
)
// Here is a real implementation of KV that writes to a local file with
// the key name and the contents are the value of the key.
type Counter struct {
}
type data struct {
Value int64
}
func (k *Counter) Put(key string, value int64, a shared.AddHelper) error {
v, _ := k.Get(key)
r, err := a.Sum(v, value)
if err != nil {
return err
}
buf, err := json.Marshal(&data{r})
if err != nil {
return err
}
return ioutil.WriteFile("kv_"+key, buf, 0644)
}
func (k *Counter) Get(key string) (int64, error) {
dataRaw, err := ioutil.ReadFile("kv_" + key)
if err != nil {
return 0, err
}
data := &data{}
err = json.Unmarshal(dataRaw, data)
if err != nil {
return 0, err
}
return data.Value, nil
}
func main() {
plugin.Serve(&plugin.ServeConfig{
HandshakeConfig: shared.Handshake,
Plugins: map[string]plugin.Plugin{
"counter": &shared.CounterPlugin{Impl: &Counter{}},
},
// A non-nil value here enables gRPC serving for this plugin...
GRPCServer: plugin.DefaultGRPCServer,
})
}
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