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server.go
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server.go
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package amqprpc
import (
"errors"
"net/rpc"
"sync"
"sync/atomic"
"github.com/streadway/amqp"
)
type route struct {
messageID string
routing string
}
type serverCodec struct {
*codec
lock *sync.RWMutex
calls map[uint64]route
seq uint64
}
func (server *serverCodec) ReadRequestHeader(r *rpc.Request) error {
server.curDelivery = <-server.message
if server.curDelivery.CorrelationId == "" {
return errors.New("no routing key in delivery")
}
r.Seq = atomic.AddUint64(&server.seq, 1)
server.lock.Lock()
server.calls[r.Seq] = route{server.curDelivery.MessageId, server.curDelivery.CorrelationId}
server.lock.Unlock()
r.ServiceMethod = server.curDelivery.ReplyTo
return nil
}
func (server *serverCodec) ReadRequestBody(v interface{}) error {
if v == nil {
return nil
}
return server.codec.codec.Unmarshal(server.curDelivery.Body, v)
}
func (server *serverCodec) WriteResponse(resp *rpc.Response, v interface{}) error {
body, err := server.codec.codec.Marshal(v)
if err != nil {
return err
}
server.lock.RLock()
route, ok := server.calls[resp.Seq]
server.lock.RUnlock()
if !ok {
return errors.New("sequence dosen't have a route")
}
publishing := amqp.Publishing{
ReplyTo: resp.ServiceMethod,
MessageId: route.messageID,
CorrelationId: route.routing,
Body: body,
}
if resp.Error != "" {
publishing.Headers = amqp.Table{"error": resp.Error}
}
return server.channel.Publish(
"",
route.routing,
false,
false,
publishing,
)
}
func (server *serverCodec) Close() error {
return server.conn.Close()
}
//NewServerCodec returns a new rpc.ClientCodec using AMQP on conn. serverRouting is the routing
//key with with RPC calls are received, encodingCodec is an EncodingCoding implementation. This package provdes JSONCodec and GobCodec for the JSON and Gob encodings respectively.
func NewServerCodec(conn *amqp.Connection, serverRouting string, encodingCodec EncodingCodec) (rpc.ServerCodec, error) {
channel, err := conn.Channel()
if err != nil {
return nil, err
}
queue, err := channel.QueueDeclare(serverRouting, false, false, false, false, nil)
if err != nil {
return nil, err
}
messages, err := channel.Consume(queue.Name, "", true, false, false, false, nil)
if err != nil {
return nil, err
}
server := &serverCodec{
codec: &codec{
conn: conn,
channel: channel,
routing: queue.Name,
codec: encodingCodec,
message: messages,
},
lock: new(sync.RWMutex),
calls: make(map[uint64]route),
seq: 0,
}
return server, err
}