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server.go
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server.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package envelope
import (
"bytes"
"fmt"
"go.uber.org/thriftrw/internal/envelope/exception"
"go.uber.org/thriftrw/protocol"
"go.uber.org/thriftrw/ptr"
"go.uber.org/thriftrw/wire"
)
// ErrUnknownMethod is raised by Handlers to indicate that the given method is
// invalid.
type ErrUnknownMethod string
func (e ErrUnknownMethod) Error() string {
return fmt.Sprintf("unknown method %q", string(e))
}
// Handler handles enveloped requests.
type Handler interface {
// Receives a request to the given method name and returns the response
// body.
//
// Implementations should return ErrUnknownMethod if the method is invalid.
Handle(name string, body wire.Value) (wire.Value, error)
}
// Server allows a Handler to process bytes.
type Server struct {
p protocol.Protocol
h Handler
}
// NewServer builds a new server.
func NewServer(p protocol.Protocol, h Handler) Server {
return Server{p: p, h: h}
}
// Handle handles the given binary payload.
func (s Server) Handle(data []byte) ([]byte, error) {
request, err := s.p.DecodeEnveloped(bytes.NewReader(data))
if err != nil {
return nil, err
}
response := wire.Envelope{
Name: request.Name,
SeqID: request.SeqID,
Type: wire.Reply,
}
response.Value, err = s.h.Handle(request.Name, request.Value)
if err != nil {
response.Type = wire.Exception
switch err.(type) {
case ErrUnknownMethod:
response.Value, err = tappExc(err, exception.ExceptionTypeUnknownMethod)
default:
response.Value, err = tappExc(err, exception.ExceptionTypeInternalError)
}
if err != nil {
return nil, err
}
}
var buff bytes.Buffer
if err := s.p.EncodeEnveloped(response, &buff); err != nil {
return nil, err
}
return buff.Bytes(), nil
}
// Helper to build TApplicationException wire.Values
func tappExc(err error, typ exception.ExceptionType) (wire.Value, error) {
return (&exception.TApplicationException{
Message: ptr.String(err.Error()),
Type: &typ,
}).ToWire()
}