// sendRPC sends an RPC out to the wire.
// Returns the response (for now, as the call is synchronous).
func (c *client) sendRPC(rpc hrpc.Call) error {
// Header.
c.id++
reqheader := &pb.RequestHeader{
CallId: &c.id,
MethodName: proto.String(rpc.Name()),
RequestParam: proto.Bool(true),
}
payload, err := rpc.Serialize()
if err != nil {
return fmt.Errorf("Failed to serialize RPC: %s", err)
}
payloadLen := proto.EncodeVarint(uint64(len(payload)))
headerData, err := proto.Marshal(reqheader)
if err != nil {
return fmt.Errorf("Failed to marshal Get request: %s", err)
}
buf := make([]byte, 5, 4+1+len(headerData)+len(payloadLen)+len(payload))
binary.BigEndian.PutUint32(buf, uint32(cap(buf)-4))
buf[4] = byte(len(headerData))
buf = append(buf, headerData...)
buf = append(buf, payloadLen...)
buf = append(buf, payload...)
c.sentRPCsMutex.Lock()
c.sentRPCs[c.id] = rpc
c.sentRPCsMutex.Unlock()
err = c.write(buf)
if err != nil {
return UnrecoverableError{err}
}
return nil
}
