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grpc.go
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grpc.go
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package main
import (
"fmt"
"log"
"time"
"github.com/docker/docker-credential-helpers/credentials"
"github.com/valyala/gorpc"
)
func init() {
gorpc.RegisterType(Request{})
gorpc.RegisterType(map[string]string{})
}
type GRPCClient struct {
client *gorpc.Client
}
func (gc *GRPCClient) Add(url, user, secret string) error {
_, err := gc.Send(Request{"add", url, user, secret})
return err
}
func (gc *GRPCClient) Delete(url string) error {
_, err := gc.Send(Request{Command: "delete", ServerURL: url})
return err
}
func (gc *GRPCClient) Get(url string) (string, string, error) {
ret, err := gc.Send(Request{Command: "get", ServerURL: url})
if err != nil {
return "", "", err
}
retMap := ret.(map[string]string)
if _, ok := retMap["Username"]; !ok {
return "", "", credentials.NewErrCredentialsNotFound()
}
return retMap["Username"], retMap["Secret"], nil
}
func (gc *GRPCClient) List() (map[string]string, error) {
ret, err := gc.Send(Request{Command: "list"})
if err != nil {
return nil, fmt.Errorf("error listing credentials")
}
return ret.(map[string]string), nil
}
func (gc *GRPCClient) Send(r Request) (interface{}, error) {
return gc.client.Call(r)
}
type GRPCTransport struct {
System
server *gorpc.Server
}
func (gt *GRPCTransport) Client(d *CacheMem) (Client, error) {
gorpc.SetErrorLogger(gorpc.NilErrorLogger)
client := gorpc.NewUnixClient("/tmp/transport.sock")
client.RequestTimeout = 100 * time.Millisecond
client.Start()
return &GRPCClient{client}, nil
}
func (gt *GRPCTransport) Initialize(d *CacheMem) error {
gt.server = gorpc.NewUnixServer("/tmp/transport.sock", func(clientAddr string, request interface{}) interface{} {
// keep daemon alive
d.Alive()
credStore := d.Creds()
switch request.(type) {
case string:
return request
case Request:
req := request.(Request)
log.Println("GRPC request:", req.Command)
switch req.Command {
case "add":
credStore[req.ServerURL] = cred{req.Username, req.Secret}
case "delete":
delete(credStore, req.ServerURL)
case "get":
ret := map[string]string{
"ServerURL": req.ServerURL,
}
if cred, ok := credStore[req.ServerURL]; ok {
ret["Username"] = cred.username
ret["Secret"] = cred.secret
}
return ret
case "list":
creds := make(map[string]string)
for server, cred := range credStore {
creds[server] = cred.username
}
return creds
case "alive":
// nothing
case "stop":
// nothing
go func() {
time.Sleep(time.Second)
d.Done()
}()
}
}
return nil
})
log.Println("starting GRPC server")
if err := gt.server.Start(); err != nil {
log.Fatalf("Cannot start rpc server: %s", err)
}
return nil
}
func (gt *GRPCTransport) Shutdown(d *CacheMem) error {
gt.server.Stop()
return nil
}