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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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Copyright (c) 2012 Rodrigo Moraes. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
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* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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rpc
===
rpc/v2 support for JSON-RPC 2.0 Specification.
gorilla/rpc is a foundation for RPC over HTTP services, providing access to the exported methods of an object through HTTP requests.
Read the full documentation here: http://www.gorillatoolkit.org/pkg/rpc

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.ORIG file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package rpc
import (
"io"
"net/http"
"strings"
"unicode"
"github.com/klauspost/compress/flate"
"github.com/klauspost/compress/gzip"
)
// gzipWriter writes and closes the gzip writer.
type gzipWriter struct {
w *gzip.Writer
}
func (gw *gzipWriter) Write(p []byte) (n int, err error) {
defer gw.w.Close()
return gw.w.Write(p)
}
// gzipEncoder implements the gzip compressed http encoder.
type gzipEncoder struct {
}
func (enc *gzipEncoder) Encode(w http.ResponseWriter) io.Writer {
w.Header().Set("Content-Encoding", "gzip")
return &gzipWriter{gzip.NewWriter(w)}
}
// flateWriter writes and closes the flate writer.
type flateWriter struct {
w *flate.Writer
}
func (fw *flateWriter) Write(p []byte) (n int, err error) {
defer fw.w.Close()
return fw.w.Write(p)
}
// flateEncoder implements the flate compressed http encoder.
type flateEncoder struct {
}
func (enc *flateEncoder) Encode(w http.ResponseWriter) io.Writer {
fw, err := flate.NewWriter(w, flate.DefaultCompression)
if err != nil {
return w
}
w.Header().Set("Content-Encoding", "deflate")
return &flateWriter{fw}
}
// CompressionSelector generates the compressed http encoder.
type CompressionSelector struct {
}
// Select method selects the correct compression encoder based on http HEADER.
func (*CompressionSelector) Select(r *http.Request) Encoder {
encHeader := r.Header.Get("Accept-Encoding")
encTypes := strings.FieldsFunc(encHeader, func(r rune) bool {
return unicode.IsSpace(r) || r == ','
})
for _, enc := range encTypes {
switch enc {
case "gzip":
return &gzipEncoder{}
case "deflate":
return &flateEncoder{}
}
}
return DefaultEncoder
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Copyright 2021 MinIO, Inc. modified to be used with MinIO.
// forked from https://github.com/gorilla/rpc/v2
/*
Package rpc is a foundation for RPC over HTTP services, providing
access to the exported methods of an object through HTTP requests.
This package derives from the standard net/rpc package but uses a single HTTP
request per call instead of persistent connections. Other differences
compared to net/rpc:
- Multiple codecs can be registered in the same server.
- A codec is chosen based on the "Content-Type" header from the request.
- Service methods also receive http.Request as parameter.
- This package can be used on Google App Engine.
Let's setup a server and register a codec and service:
import (
"http"
"github.com/minio/minio/contrib/pkg/rpc/"
"github.com/minio/minio/contrib/pkg/rpc/json2"
)
func init() {
s := rpc.NewServer()
s.RegisterCodec(json2.NewCodec(), "application/json")
s.RegisterService(new(HelloService), "")
http.Handle("/rpc", s)
}
This server handles requests to the "/rpc" path using a JSON codec.
A codec is tied to a content type. In the example above, the JSON codec is
registered to serve requests with "application/json" as the value for the
"Content-Type" header. If the header includes a charset definition, it is
ignored; only the media-type part is taken into account.
A service can be registered using a name. If the name is empty, like in the
example above, it will be inferred from the service type.
That's all about the server setup. Now let's define a simple service:
type HelloArgs struct {
Who string
}
type HelloReply struct {
Message string
}
type HelloService struct {}
func (h *HelloService) Say(r *http.Request, args *HelloArgs, reply *HelloReply) error {
reply.Message = "Hello, " + args.Who + "!"
return nil
}
The example above defines a service with a method "HelloService.Say" and
the arguments and reply related to that method.
The service must be exported (begin with an upper case letter) or local
(defined in the package registering the service).
When a service is registered, the server inspects the service methods
and make available the ones that follow these rules:
- The method name is exported.
- The method has three arguments: *http.Request, *args, *reply.
- All three arguments are pointers.
- The second and third arguments are exported or local.
- The method has return type error.
All other methods are ignored.
*/
package rpc

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package rpc
import (
"io"
"net/http"
)
// Encoder interface contains the encoder for http response.
// Eg. gzip, flate compressions.
type Encoder interface {
Encode(w http.ResponseWriter) io.Writer
}
type encoder struct {
}
func (_ *encoder) Encode(w http.ResponseWriter) io.Writer {
return w
}
var DefaultEncoder = &encoder{}
// EncoderSelector interface provides a way to select encoder using the http
// request. Typically people can use this to check HEADER of the request and
// figure out client capabilities.
// Eg. "Accept-Encoding" tells about supported compressions.
type EncoderSelector interface {
Select(r *http.Request) Encoder
}
type encoderSelector struct {
}
func (_ *encoderSelector) Select(_ *http.Request) Encoder {
return DefaultEncoder
}
var DefaultEncoderSelector = &encoderSelector{}

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package json2
import (
"io"
"math/rand"
jsoniter "github.com/json-iterator/go"
)
// ----------------------------------------------------------------------------
// Request and Response
// ----------------------------------------------------------------------------
// clientRequest represents a JSON-RPC request sent by a client.
type clientRequest struct {
// JSON-RPC protocol.
Version string `json:"jsonrpc"`
// A String containing the name of the method to be invoked.
Method string `json:"method"`
// Object to pass as request parameter to the method.
Params interface{} `json:"params"`
// The request id. This can be of any type. It is used to match the
// response with the request that it is replying to.
Id uint64 `json:"id"`
}
// clientResponse represents a JSON-RPC response returned to a client.
type clientResponse struct {
Version string `json:"jsonrpc"`
Result *jsoniter.RawMessage `json:"result"`
Error *jsoniter.RawMessage `json:"error"`
}
// EncodeClientRequest encodes parameters for a JSON-RPC client request.
func EncodeClientRequest(method string, args interface{}) ([]byte, error) {
c := &clientRequest{
Version: "2.0",
Method: method,
Params: args,
Id: uint64(rand.Int63()),
}
var json = jsoniter.ConfigCompatibleWithStandardLibrary
return json.Marshal(c)
}
// DecodeClientResponse decodes the response body of a client request into
// the interface reply.
func DecodeClientResponse(r io.Reader, reply interface{}) error {
var c clientResponse
var json = jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.NewDecoder(r).Decode(&c); err != nil {
return err
}
if c.Error != nil {
jsonErr := &Error{}
if err := json.Unmarshal(*c.Error, jsonErr); err != nil {
return &Error{
Code: E_SERVER,
Message: string(*c.Error),
}
}
return jsonErr
}
if c.Result == nil {
return ErrNullResult
}
return json.Unmarshal(*c.Result, reply)
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package json2
import (
"errors"
)
type ErrorCode int
const (
E_PARSE ErrorCode = -32700
E_INVALID_REQ ErrorCode = -32600
E_NO_METHOD ErrorCode = -32601
E_BAD_PARAMS ErrorCode = -32602
E_INTERNAL ErrorCode = -32603
E_SERVER ErrorCode = -32000
)
var ErrNullResult = errors.New("result is null")
type Error struct {
// A Number that indicates the error type that occurred.
Code ErrorCode `json:"code"` /* required */
// A String providing a short description of the error.
// The message SHOULD be limited to a concise single sentence.
Message string `json:"message"` /* required */
// A Primitive or Structured value that contains additional information about the error.
Data interface{} `json:"data"` /* optional */
}
func (e *Error) Error() string {
return e.Message
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package json2
import (
"bytes"
"encoding/json"
"errors"
"net/http"
"strings"
"testing"
"github.com/minio/minio/contrib/pkg/rpc"
)
// ResponseRecorder is an implementation of http.ResponseWriter that
// records its mutations for later inspection in tests.
type ResponseRecorder struct {
Code int // the HTTP response code from WriteHeader
HeaderMap http.Header // the HTTP response headers
Body *bytes.Buffer // if non-nil, the bytes.Buffer to append written data to
Flushed bool
}
// NewRecorder returns an initialized ResponseRecorder.
func NewRecorder() *ResponseRecorder {
return &ResponseRecorder{
HeaderMap: make(http.Header),
Body: new(bytes.Buffer),
}
}
// DefaultRemoteAddr is the default remote address to return in RemoteAddr if
// an explicit DefaultRemoteAddr isn't set on ResponseRecorder.
const DefaultRemoteAddr = "1.2.3.4"
// Header returns the response headers.
func (rw *ResponseRecorder) Header() http.Header {
return rw.HeaderMap
}
// Write always succeeds and writes to rw.Body, if not nil.
func (rw *ResponseRecorder) Write(buf []byte) (int, error) {
if rw.Body != nil {
rw.Body.Write(buf)
}
if rw.Code == 0 {
rw.Code = http.StatusOK
}
return len(buf), nil
}
// WriteHeader sets rw.Code.
func (rw *ResponseRecorder) WriteHeader(code int) {
rw.Code = code
}
// Flush sets rw.Flushed to true.
func (rw *ResponseRecorder) Flush() {
rw.Flushed = true
}
// ----------------------------------------------------------------------------
var ErrResponseError = errors.New("response error")
var ErrMappedResponseError = errors.New("mapped response error")
type Service1Request struct {
A int
B int
}
type Service1NoParamsRequest struct {
V string `json:"jsonrpc"`
M string `json:"method"`
ID uint64 `json:"id"`
}
type Service1ParamsArrayRequest struct {
V string `json:"jsonrpc"`
P []struct {
T string
} `json:"params"`
M string `json:"method"`
ID uint64 `json:"id"`
}
type Service1Response struct {
Result int
}
type Service1 struct {
}
const Service1DefaultResponse = 9999
func (t *Service1) Multiply(r *http.Request, req *Service1Request, res *Service1Response) error {
if req.A == 0 && req.B == 0 {
// Sentinel value for test with no params.
res.Result = Service1DefaultResponse
} else {
res.Result = req.A * req.B
}
return nil
}
func (t *Service1) ResponseError(r *http.Request, req *Service1Request, res *Service1Response) error {
return ErrResponseError
}
func (t *Service1) MappedResponseError(r *http.Request, req *Service1Request, res *Service1Response) error {
return ErrMappedResponseError
}
func execute(t *testing.T, s *rpc.Server, method string, req, res interface{}) error {
if !s.HasMethod(method) {
t.Fatal("Expected to be registered:", method)
}
buf, _ := EncodeClientRequest(method, req)
body := bytes.NewBuffer(buf)
r, _ := http.NewRequest("POST", "http://localhost:8080/", body)
r.Header.Set("Content-Type", "application/json")
w := NewRecorder()
s.ServeHTTP(w, r)
return DecodeClientResponse(w.Body, res)
}
func executeRaw(t *testing.T, s *rpc.Server, req interface{}, res interface{}) error {
j, _ := json.Marshal(req)
r, _ := http.NewRequest("POST", "http://localhost:8080/", bytes.NewBuffer(j))
r.Header.Set("Content-Type", "application/json")
w := NewRecorder()
s.ServeHTTP(w, r)
return DecodeClientResponse(w.Body, res)
}
func executeInvalidJSON(t *testing.T, s *rpc.Server, res interface{}) error {
r, _ := http.NewRequest("POST", "http://localhost:8080/", strings.NewReader(`not even a json`))
r.Header.Set("Content-Type", "application/json")
w := NewRecorder()
s.ServeHTTP(w, r)
return DecodeClientResponse(w.Body, res)
}
func TestService(t *testing.T) {
s := rpc.NewServer()
s.RegisterCodec(NewCodec(), "application/json")
s.RegisterService(new(Service1), "")
var res Service1Response
if err := execute(t, s, "Service1.Multiply", &Service1Request{4, 2}, &res); err != nil {
t.Error("Expected err to be nil, but got:", err)
}
if res.Result != 8 {
t.Errorf("Wrong response: %v.", res.Result)
}
if err := execute(t, s, "Service1.ResponseError", &Service1Request{4, 2}, &res); err == nil {
t.Errorf("Expected to get %q, but got nil", ErrResponseError)
} else if err.Error() != ErrResponseError.Error() {
t.Errorf("Expected to get %q, but got %q", ErrResponseError, err)
}
// No parameters.
res = Service1Response{}
if err := executeRaw(t, s, &Service1NoParamsRequest{"2.0", "Service1.Multiply", 1}, &res); err != nil {
t.Error(err)
}
if res.Result != Service1DefaultResponse {
t.Errorf("Wrong response: got %v, want %v", res.Result, Service1DefaultResponse)
}
// Parameters as by-position.
res = Service1Response{}
req := Service1ParamsArrayRequest{
V: "2.0",
P: []struct {
T string
}{{
T: "test",
}},
M: "Service1.Multiply",
ID: 1,
}
if err := executeRaw(t, s, &req, &res); err != nil {
t.Error(err)
}
if res.Result != Service1DefaultResponse {
t.Errorf("Wrong response: got %v, want %v", res.Result, Service1DefaultResponse)
}
res = Service1Response{}
if err := executeInvalidJSON(t, s, &res); err == nil {
t.Error("Expected to receive an E_PARSE error, but got nil")
} else if jsonRpcErr, ok := err.(*Error); !ok {
t.Errorf("Expected to receive an Error, but got %T: %s", err, err)
} else if jsonRpcErr.Code != E_PARSE {
t.Errorf("Expected to receive an E_PARSE JSON-RPC error (%d) but got %d", E_PARSE, jsonRpcErr.Code)
}
}
func TestServiceWithErrorMapper(t *testing.T) {
const mappedErrorCode = 100
// errorMapper maps ErrMappedResponseError to an Error with mappedErrorCode Code, everything else is returned as-is
errorMapper := func(err error) error {
if err == ErrMappedResponseError {
return &Error{
Code: mappedErrorCode,
Message: err.Error(),
}
}
// Map everything else to E_SERVER
return &Error{
Code: E_SERVER,
Message: err.Error(),
}
}
s := rpc.NewServer()
s.RegisterCodec(NewCustomCodecWithErrorMapper(rpc.DefaultEncoderSelector, errorMapper), "application/json")
s.RegisterService(new(Service1), "")
var res Service1Response
if err := execute(t, s, "Service1.MappedResponseError", &Service1Request{4, 2}, &res); err == nil {
t.Errorf("Expected to get a JSON-RPC error, but got nil")
} else if jsonRpcErr, ok := err.(*Error); !ok {
t.Errorf("Expected to get an *Error, but got %T: %s", err, err)
} else if jsonRpcErr.Code != mappedErrorCode {
t.Errorf("Expected to get Code %d, but got %d", mappedErrorCode, jsonRpcErr.Code)
} else if jsonRpcErr.Message != ErrMappedResponseError.Error() {
t.Errorf("Expected to get Message %q, but got %q", ErrMappedResponseError.Error(), jsonRpcErr.Message)
}
// Unmapped error behaves as usual
if err := execute(t, s, "Service1.ResponseError", &Service1Request{4, 2}, &res); err == nil {
t.Errorf("Expected to get a JSON-RPC error, but got nil")
} else if jsonRpcErr, ok := err.(*Error); !ok {
t.Errorf("Expected to get an *Error, but got %T: %s", err, err)
} else if jsonRpcErr.Code != E_SERVER {
t.Errorf("Expected to get Code %d, but got %d", E_SERVER, jsonRpcErr.Code)
} else if jsonRpcErr.Message != ErrResponseError.Error() {
t.Errorf("Expected to get Message %q, but got %q", ErrResponseError.Error(), jsonRpcErr.Message)
}
// Malformed request without method: our framework tries to return an error: we shouldn't map that one
malformedRequest := struct {
V string `json:"jsonrpc"`
ID string `json:"id"`
}{
V: "3.0",
ID: "any",
}
if err := executeRaw(t, s, &malformedRequest, &res); err == nil {
t.Errorf("Expected to get a JSON-RPC error, but got nil")
} else if jsonRpcErr, ok := err.(*Error); !ok {
t.Errorf("Expected to get an *Error, but got %T: %s", err, err)
} else if jsonRpcErr.Code != E_INVALID_REQ {
t.Errorf("Expected to get an E_INVALID_REQ error (%d), but got %d", E_INVALID_REQ, jsonRpcErr.Code)
}
}
func TestDecodeNullResult(t *testing.T) {
data := `{"jsonrpc": "2.0", "id": 12345, "result": null}`
reader := bytes.NewReader([]byte(data))
var result interface{}
err := DecodeClientResponse(reader, &result)
if err != ErrNullResult {
t.Error("Expected err no be ErrNullResult, but got:", err)
}
if result != nil {
t.Error("Expected result to be nil, but got:", result)
}
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package json2
import (
"net/http"
jsoniter "github.com/json-iterator/go"
"github.com/minio/minio/contrib/pkg/rpc"
)
var null = jsoniter.RawMessage([]byte("null"))
var Version = "2.0"
// ----------------------------------------------------------------------------
// Request and Response
// ----------------------------------------------------------------------------
// serverRequest represents a JSON-RPC request received by the server.
type serverRequest struct {
// JSON-RPC protocol.
Version string `json:"jsonrpc"`
// A String containing the name of the method to be invoked.
Method string `json:"method"`
// A Structured value to pass as arguments to the method.
Params *jsoniter.RawMessage `json:"params"`
// The request id. MUST be a string, number or null.
// Our implementation will not do type checking for id.
// It will be copied as it is.
ID *jsoniter.RawMessage `json:"id"`
}
// serverResponse represents a JSON-RPC response returned by the server.
type serverResponse struct {
// JSON-RPC protocol.
Version string `json:"jsonrpc"`
// The Object that was returned by the invoked method. This must be null
// in case there was an error invoking the method.
// As per spec the member will be omitted if there was an error.
Result interface{} `json:"result,omitempty"`
// An Error object if there was an error invoking the method. It must be
// null if there was no error.
// As per spec the member will be omitted if there was no error.
Error *Error `json:"error,omitempty"`
// This must be the same id as the request it is responding to.
ID *jsoniter.RawMessage `json:"id"`
}
// ----------------------------------------------------------------------------
// Codec
// ----------------------------------------------------------------------------
// NewCustomCodec returns a new JSON Codec based on passed encoder selector.
func NewCustomCodec(encSel rpc.EncoderSelector) *Codec {
return &Codec{encSel: encSel}
}
// NewCustomCodecWithErrorMapper returns a new JSON Codec based on the passed encoder selector
// and also accepts an errorMapper function.
// The errorMapper function will be called if the Service implementation returns an error, with that
// error as a param, replacing it by the value returned by this function. This function is intended
// to decouple your service implementation from the codec itself, making possible to return abstract
// errors in your service, and then mapping them here to the JSON-RPC error codes.
func NewCustomCodecWithErrorMapper(encSel rpc.EncoderSelector, errorMapper func(error) error) *Codec {
return &Codec{
encSel: encSel,
errorMapper: errorMapper,
}
}
// NewCodec returns a new JSON Codec.
func NewCodec() *Codec {
return NewCustomCodec(rpc.DefaultEncoderSelector)
}
// Codec creates a CodecRequest to process each request.
type Codec struct {
encSel rpc.EncoderSelector
errorMapper func(error) error
}
// NewRequest returns a CodecRequest.
func (c *Codec) NewRequest(r *http.Request) rpc.CodecRequest {
return newCodecRequest(r, c.encSel.Select(r), c.errorMapper)
}
// ----------------------------------------------------------------------------
// CodecRequest
// ----------------------------------------------------------------------------
// newCodecRequest returns a new CodecRequest.
func newCodecRequest(r *http.Request, encoder rpc.Encoder, errorMapper func(error) error) rpc.CodecRequest {
// Decode the request body and check if RPC method is valid.
req := new(serverRequest)
var json = jsoniter.ConfigCompatibleWithStandardLibrary
err := json.NewDecoder(r.Body).Decode(req)
if err != nil {
err = &Error{
Code: E_PARSE,
Message: err.Error(),
Data: req,
}
} else if req.Version != Version {
err = &Error{
Code: E_INVALID_REQ,
Message: "jsonrpc must be " + Version,
Data: req,
}
}
r.Body.Close()
return &CodecRequest{request: req, err: err, encoder: encoder, errorMapper: errorMapper}
}
// CodecRequest decodes and encodes a single request.
type CodecRequest struct {
request *serverRequest
err error
encoder rpc.Encoder
errorMapper func(error) error
}
// Method returns the RPC method for the current request.
//
// The method uses a dotted notation as in "Service.Method".
func (c *CodecRequest) Method() (string, error) {
if c.err == nil {
return c.request.Method, nil
}
return "", c.err
}
// ReadRequest fills the request object for the RPC method.
//
// ReadRequest parses request parameters in two supported forms in
// accordance with http://www.jsonrpc.org/specification#parameter_structures
//
// by-position: params MUST be an Array, containing the
// values in the Server expected order.
//
// by-name: params MUST be an Object, with member names
// that match the Server expected parameter names. The
// absence of expected names MAY result in an error being
// generated. The names MUST match exactly, including
// case, to the method's expected parameters.
func (c *CodecRequest) ReadRequest(args interface{}) error {
if c.err == nil && c.request.Params != nil {
// Note: if c.request.Params is nil it's not an error, it's an optional member.
// JSON params structured object. Unmarshal to the args object.
var json = jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal(*c.request.Params, args); err != nil {
// Clearly JSON params is not a structured object,
// fallback and attempt an unmarshal with JSON params as
// array value and RPC params is struct. Unmarshal into
// array containing the request struct.
params := [1]interface{}{args}
if err = json.Unmarshal(*c.request.Params, &params); err != nil {
c.err = &Error{
Code: E_INVALID_REQ,
Message: err.Error(),
Data: c.request.Params,
}
}
}
}
return c.err
}
// WriteResponse encodes the response and writes it to the ResponseWriter.
func (c *CodecRequest) WriteResponse(w http.ResponseWriter, reply interface{}) {
res := &serverResponse{
Version: Version,
Result: reply,
ID: c.request.ID,
}
c.writeServerResponse(w, res)
}
func (c *CodecRequest) WriteError(w http.ResponseWriter, status int, err error) {
err = c.tryToMapIfNotAnErrorAlready(err)
jsonErr, ok := err.(*Error)
if !ok {
jsonErr = &Error{
Code: E_SERVER,
Message: err.Error(),
}
}
res := &serverResponse{
Version: Version,
Error: jsonErr,
ID: c.request.ID,
}
c.writeServerResponse(w, res)
}
func (c CodecRequest) tryToMapIfNotAnErrorAlready(err error) error {
if _, ok := err.(*Error); ok || c.errorMapper == nil {
return err
}
return c.errorMapper(err)
}
func (c *CodecRequest) writeServerResponse(w http.ResponseWriter, res *serverResponse) {
// ID is null for notifications and they don't have a response, unless we couldn't even parse the JSON, in that
// case we can't know whether it was intended to be a notification
if c.request.ID != nil || isParseErrorResponse(res) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
var json = jsoniter.ConfigCompatibleWithStandardLibrary
encoder := json.NewEncoder(c.encoder.Encode(w))
err := encoder.Encode(res)
// Not sure in which case will this happen. But seems harmless.
if err != nil {
rpc.WriteError(w, http.StatusInternalServerError, err.Error())
}
}
}
func isParseErrorResponse(res *serverResponse) bool {
return res != nil && res.Error != nil && res.Error.Code == E_PARSE
}
type EmptyResponse struct {
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package rpc
import (
"fmt"
"net/http"
"reflect"
"strings"
"sync"
"unicode"
"unicode/utf8"
)
var (
// Precompute the reflect.Type of error and http.Request
typeOfError = reflect.TypeOf((*error)(nil)).Elem()
typeOfRequest = reflect.TypeOf((*http.Request)(nil)).Elem()
)
// ----------------------------------------------------------------------------
// service
// ----------------------------------------------------------------------------
type service struct {
name string // name of service
rcvr reflect.Value // receiver of methods for the service
rcvrType reflect.Type // type of the receiver
methods map[string]*serviceMethod // registered methods
}
type serviceMethod struct {
method reflect.Method // receiver method
argsType reflect.Type // type of the request argument
replyType reflect.Type // type of the response argument
}
// ----------------------------------------------------------------------------
// serviceMap
// ----------------------------------------------------------------------------
// serviceMap is a registry for services.
type serviceMap struct {
mutex sync.Mutex
services map[string]*service
}
// register adds a new service using reflection to extract its methods.
func (m *serviceMap) register(rcvr interface{}, name string) error {
// Setup service.
s := &service{
name: name,
rcvr: reflect.ValueOf(rcvr),
rcvrType: reflect.TypeOf(rcvr),
methods: make(map[string]*serviceMethod),
}
if name == "" {
s.name = reflect.Indirect(s.rcvr).Type().Name()
if !isExported(s.name) {
return fmt.Errorf("rpc: type %q is not exported", s.name)
}
}
if s.name == "" {
return fmt.Errorf("rpc: no service name for type %q",
s.rcvrType.String())
}
// Setup methods.
for i := 0; i < s.rcvrType.NumMethod(); i++ {
method := s.rcvrType.Method(i)
mtype := method.Type
// Method must be exported.
if method.PkgPath != "" {
continue
}
// Method needs four ins: receiver, *http.Request, *args, *reply.
if mtype.NumIn() != 4 {
continue
}
// First argument must be a pointer and must be http.Request.
reqType := mtype.In(1)
if reqType.Kind() != reflect.Ptr || reqType.Elem() != typeOfRequest {
continue
}
// Second argument must be a pointer and must be exported.
args := mtype.In(2)
if args.Kind() != reflect.Ptr || !isExportedOrBuiltin(args) {
continue
}
// Third argument must be a pointer and must be exported.
reply := mtype.In(3)
if reply.Kind() != reflect.Ptr || !isExportedOrBuiltin(reply) {
continue
}
// Method needs one out: error.
if mtype.NumOut() != 1 {
continue
}
if returnType := mtype.Out(0); returnType != typeOfError {
continue
}
s.methods[method.Name] = &serviceMethod{
method: method,
argsType: args.Elem(),
replyType: reply.Elem(),
}
}
if len(s.methods) == 0 {
return fmt.Errorf("rpc: %q has no exported methods of suitable type",
s.name)
}
// Add to the map.
m.mutex.Lock()
defer m.mutex.Unlock()
if m.services == nil {
m.services = make(map[string]*service)
} else if _, ok := m.services[s.name]; ok {
return fmt.Errorf("rpc: service already defined: %q", s.name)
}
m.services[s.name] = s
return nil
}
// get returns a registered service given a method name.
//
// The method name uses a dotted notation as in "Service.Method".
func (m *serviceMap) get(method string) (*service, *serviceMethod, error) {
parts := strings.Split(method, ".")
if len(parts) != 2 {
err := fmt.Errorf("rpc: service/method request ill-formed: %q", method)
return nil, nil, err
}
m.mutex.Lock()
service := m.services[parts[0]]
m.mutex.Unlock()
if service == nil {
err := fmt.Errorf("rpc: can't find service %q", method)
return nil, nil, err
}
serviceMethod := service.methods[parts[1]]
if serviceMethod == nil {
err := fmt.Errorf("rpc: can't find method %q", method)
return nil, nil, err
}
return service, serviceMethod, nil
}
// isExported returns true of a string is an exported (upper case) name.
func isExported(name string) bool {
rune, _ := utf8.DecodeRuneInString(name)
return unicode.IsUpper(rune)
}
// isExportedOrBuiltin returns true if a type is exported or a builtin.
func isExportedOrBuiltin(t reflect.Type) bool {
for t.Kind() == reflect.Ptr {
t = t.Elem()
}
// PkgPath will be non-empty even for an exported type,
// so we need to check the type name as well.
return isExported(t.Name()) || t.PkgPath() == ""
}

318
contrib/pkg/rpc/server.go Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package rpc
import (
"fmt"
"net/http"
"reflect"
"strings"
)
var nilErrorValue = reflect.Zero(reflect.TypeOf((*error)(nil)).Elem())
// ----------------------------------------------------------------------------
// Codec
// ----------------------------------------------------------------------------
// Codec creates a CodecRequest to process each request.
type Codec interface {
NewRequest(*http.Request) CodecRequest
}
// CodecRequest decodes a request and encodes a response using a specific
// serialization scheme.
type CodecRequest interface {
// Reads the request and returns the RPC method name.
Method() (string, error)
// Reads the request filling the RPC method args.
ReadRequest(interface{}) error
// Writes the response using the RPC method reply.
WriteResponse(http.ResponseWriter, interface{})
// Writes an error produced by the server.
WriteError(w http.ResponseWriter, status int, err error)
}
// ----------------------------------------------------------------------------
// Server
// ----------------------------------------------------------------------------
// NewServer returns a new RPC server.
func NewServer() *Server {
return &Server{
codecs: make(map[string]Codec),
services: new(serviceMap),
}
}
// RequestInfo contains all the information we pass to before/after functions
type RequestInfo struct {
Args reflect.Value
Method string
Error error
ResponseWriter http.ResponseWriter
Request *http.Request
StatusCode int
}
// Server serves registered RPC services using registered codecs.
type Server struct {
codecs map[string]Codec
services *serviceMap
interceptFunc func(i *RequestInfo) *http.Request
beforeFunc func(i *RequestInfo)
afterFunc func(i *RequestInfo)
validateFunc reflect.Value
}
// RegisterCodec adds a new codec to the server.
//
// Codecs are defined to process a given serialization scheme, e.g., JSON or
// XML. A codec is chosen based on the "Content-Type" header from the request,
// excluding the charset definition.
func (s *Server) RegisterCodec(codec Codec, contentType string) {
s.codecs[strings.ToLower(contentType)] = codec
}
// RegisterInterceptFunc registers the specified function as the function
// that will be called before every request. The function is allowed to intercept
// the request e.g. add values to the context.
//
// Note: Only one function can be registered, subsequent calls to this
// method will overwrite all the previous functions.
func (s *Server) RegisterInterceptFunc(f func(i *RequestInfo) *http.Request) {
s.interceptFunc = f
}
// RegisterBeforeFunc registers the specified function as the function
// that will be called before every request.
//
// Note: Only one function can be registered, subsequent calls to this
// method will overwrite all the previous functions.
func (s *Server) RegisterBeforeFunc(f func(i *RequestInfo)) {
s.beforeFunc = f
}
// RegisterValidateRequestFunc registers the specified function as the function
// that will be called after the BeforeFunc (if registered) and before invoking
// the actual Service method. If this function returns a non-nil error, the method
// won't be invoked and this error will be considered as the method result.
// The first argument is information about the request, useful for accessing to http.Request.Context()
// The second argument of this function is the already-unmarshalled *args parameter of the method.
func (s *Server) RegisterValidateRequestFunc(f func(r *RequestInfo, i interface{}) error) {
s.validateFunc = reflect.ValueOf(f)
}
// RegisterAfterFunc registers the specified function as the function
// that will be called after every request
//
// Note: Only one function can be registered, subsequent calls to this
// method will overwrite all the previous functions.
func (s *Server) RegisterAfterFunc(f func(i *RequestInfo)) {
s.afterFunc = f
}
// RegisterService adds a new service to the server.
//
// The name parameter is optional: if empty it will be inferred from
// the receiver type name.
//
// Methods from the receiver will be extracted if these rules are satisfied:
//
// - The receiver is exported (begins with an upper case letter) or local
// (defined in the package registering the service).
// - The method name is exported.
// - The method has three arguments: *http.Request, *args, *reply.
// - All three arguments are pointers.
// - The second and third arguments are exported or local.
// - The method has return type error.
//
// All other methods are ignored.
func (s *Server) RegisterService(receiver interface{}, name string) error {
return s.services.register(receiver, name)
}
// HasMethod returns true if the given method is registered.
//
// The method uses a dotted notation as in "Service.Method".
func (s *Server) HasMethod(method string) bool {
if _, _, err := s.services.get(method); err == nil {
return true
}
return false
}
// ServeHTTP
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
err := fmt.Errorf("rpc: POST method required, received %s", r.Method)
WriteError(w, http.StatusMethodNotAllowed, err.Error())
// Call the registered After Function
if s.afterFunc != nil {
s.afterFunc(&RequestInfo{
ResponseWriter: w,
Request: r,
Method: "Unknown." + r.Method,
StatusCode: http.StatusMethodNotAllowed,
})
}
return
}
contentType := r.Header.Get("Content-Type")
idx := strings.Index(contentType, ";")
if idx != -1 {
contentType = contentType[:idx]
}
var codec Codec
if contentType == "" && len(s.codecs) == 1 {
// If Content-Type is not set and only one codec has been registered,
// then default to that codec.
for _, c := range s.codecs {
codec = c
}
} else if codec = s.codecs[strings.ToLower(contentType)]; codec == nil {
err := fmt.Errorf("rpc: unrecognized Content-Type: %s", contentType)
WriteError(w, http.StatusUnsupportedMediaType, err.Error())
// Call the registered After Function
if s.afterFunc != nil {
s.afterFunc(&RequestInfo{
ResponseWriter: w,
Request: r,
Method: "Unknown." + r.Method,
Error: err,
StatusCode: http.StatusUnsupportedMediaType,
})
}
return
}
// Create a new codec request.
codecReq := codec.NewRequest(r)
// Get service method to be called.
method, errMethod := codecReq.Method()
if errMethod != nil {
codecReq.WriteError(w, http.StatusBadRequest, errMethod)
if s.afterFunc != nil {
s.afterFunc(&RequestInfo{
ResponseWriter: w,
Request: r,
Method: "Unknown." + r.Method,
Error: errMethod,
StatusCode: http.StatusBadRequest,
})
}
return
}
serviceSpec, methodSpec, errGet := s.services.get(method)
if errGet != nil {
codecReq.WriteError(w, http.StatusBadRequest, errGet)
if s.afterFunc != nil {
s.afterFunc(&RequestInfo{
ResponseWriter: w,
Request: r,
Method: method,
Error: errGet,
StatusCode: http.StatusBadRequest,
})
}
return
}
// Decode the args.
args := reflect.New(methodSpec.argsType)
if errRead := codecReq.ReadRequest(args.Interface()); errRead != nil {
codecReq.WriteError(w, http.StatusBadRequest, errRead)
if s.afterFunc != nil {
s.afterFunc(&RequestInfo{
ResponseWriter: w,
Request: r,
Method: method,
Error: errRead,
StatusCode: http.StatusBadRequest,
})
}
return
}
// Call the registered Intercept Function
if s.interceptFunc != nil {
req := s.interceptFunc(&RequestInfo{
Request: r,
Method: method,
})
if req != nil {
r = req
}
}
requestInfo := &RequestInfo{
Request: r,
Method: method,
}
// Call the registered Before Function
if s.beforeFunc != nil {
s.beforeFunc(requestInfo)
}
// Prepare the reply, we need it even if validation fails
reply := reflect.New(methodSpec.replyType)
errValue := []reflect.Value{nilErrorValue}
// Call the registered Validator Function
if s.validateFunc.IsValid() {
errValue = s.validateFunc.Call([]reflect.Value{reflect.ValueOf(requestInfo), args})
}
// If still no errors after validation, call the method
if errValue[0].IsNil() {
errValue = methodSpec.method.Func.Call([]reflect.Value{
serviceSpec.rcvr,
reflect.ValueOf(r),
args,
reply,
})
}
// Extract the result to error if needed.
var errResult error
statusCode := http.StatusOK
errInter := errValue[0].Interface()
if errInter != nil {
statusCode = http.StatusBadRequest
errResult = errInter.(error)
}
// Prevents Internet Explorer from MIME-sniffing a response away
// from the declared content-type
w.Header().Set("x-content-type-options", "nosniff")
// Encode the response.
if errResult == nil {
codecReq.WriteResponse(w, reply.Interface())
} else {
codecReq.WriteError(w, statusCode, errResult)
}
// Call the registered After Function
if s.afterFunc != nil {
s.afterFunc(&RequestInfo{
Args: args,
ResponseWriter: w,
Request: r,
Method: method,
Error: errResult,
StatusCode: statusCode,
})
}
}
func WriteError(w http.ResponseWriter, status int, msg string) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(status)
fmt.Fprint(w, msg)
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Modified to be used with MinIO, uses jsoniter and
// supports tracing JSON-rpc calls.
package rpc
import (
"errors"
"net/http"
"strconv"
"testing"
)
type Service1Request struct {
A int
B int
}
type Service1Response struct {
Result int
}
type Service1 struct {
}
func (t *Service1) Multiply(r *http.Request, req *Service1Request, res *Service1Response) error {
res.Result = req.A * req.B
return nil
}
type Service2 struct {
}
func TestRegisterService(t *testing.T) {
var err error
s := NewServer()
service1 := new(Service1)
service2 := new(Service2)
// Inferred name.
err = s.RegisterService(service1, "")
if err != nil || !s.HasMethod("Service1.Multiply") {
t.Errorf("Expected to be registered: Service1.Multiply")
}
// Provided name.
err = s.RegisterService(service1, "Foo")
if err != nil || !s.HasMethod("Foo.Multiply") {
t.Errorf("Expected to be registered: Foo.Multiply")
}
// No methods.
err = s.RegisterService(service2, "")
if err == nil {
t.Errorf("Expected error on service2")
}
}
// MockCodec decodes to Service1.Multiply.
type MockCodec struct {
A, B int
}
func (c MockCodec) NewRequest(*http.Request) CodecRequest {
return MockCodecRequest{c.A, c.B}
}
type MockCodecRequest struct {
A, B int
}
func (r MockCodecRequest) Method() (string, error) {
return "Service1.Multiply", nil
}
func (r MockCodecRequest) ReadRequest(args interface{}) error {
req := args.(*Service1Request)
req.A, req.B = r.A, r.B
return nil
}
func (r MockCodecRequest) WriteResponse(w http.ResponseWriter, reply interface{}) {
res := reply.(*Service1Response)
w.Write([]byte(strconv.Itoa(res.Result)))
}
func (r MockCodecRequest) WriteError(w http.ResponseWriter, status int, err error) {
w.WriteHeader(status)
w.Write([]byte(err.Error()))
}
type MockResponseWriter struct {
header http.Header
Status int
Body string
}
func NewMockResponseWriter() *MockResponseWriter {
header := make(http.Header)
return &MockResponseWriter{header: header}
}
func (w *MockResponseWriter) Header() http.Header {
return w.header
}
func (w *MockResponseWriter) Write(p []byte) (int, error) {
w.Body = string(p)
if w.Status == 0 {
w.Status = 200
}
return len(p), nil
}
func (w *MockResponseWriter) WriteHeader(status int) {
w.Status = status
}
func TestServeHTTP(t *testing.T) {
const (
A = 2
B = 3
)
expected := A * B
s := NewServer()
s.RegisterService(new(Service1), "")
s.RegisterCodec(MockCodec{A, B}, "mock")
r, err := http.NewRequest("POST", "", nil)
if err != nil {
t.Fatal(err)
}
r.Header.Set("Content-Type", "mock; dummy")
w := NewMockResponseWriter()
s.ServeHTTP(w, r)
if w.Status != 200 {
t.Errorf("Status was %d, should be 200.", w.Status)
}
if w.Body != strconv.Itoa(expected) {
t.Errorf("Response body was %s, should be %s.", w.Body, strconv.Itoa(expected))
}
// Test wrong Content-Type
r.Header.Set("Content-Type", "invalid")
w = NewMockResponseWriter()
s.ServeHTTP(w, r)
if w.Status != 415 {
t.Errorf("Status was %d, should be 415.", w.Status)
}
if w.Body != "rpc: unrecognized Content-Type: invalid" {
t.Errorf("Wrong response body.")
}
// Test omitted Content-Type; codec should default to the sole registered one.
r.Header.Del("Content-Type")
w = NewMockResponseWriter()
s.ServeHTTP(w, r)
if w.Status != 200 {
t.Errorf("Status was %d, should be 200.", w.Status)
}
if w.Body != strconv.Itoa(expected) {
t.Errorf("Response body was %s, should be %s.", w.Body, strconv.Itoa(expected))
}
}
func TestInterception(t *testing.T) {
const (
A = 2
B = 3
)
expected := A * B
r2, err := http.NewRequest("POST", "mocked/request", nil)
if err != nil {
t.Fatal(err)
}
s := NewServer()
s.RegisterService(new(Service1), "")
s.RegisterCodec(MockCodec{A, B}, "mock")
s.RegisterInterceptFunc(func(i *RequestInfo) *http.Request {
return r2
})
s.RegisterValidateRequestFunc(func(info *RequestInfo, v interface{}) error { return nil })
s.RegisterAfterFunc(func(i *RequestInfo) {
if i.Request != r2 {
t.Errorf("Request was %v, should be %v.", i.Request, r2)
}
})
r, err := http.NewRequest("POST", "", nil)
if err != nil {
t.Fatal(err)
}
r.Header.Set("Content-Type", "mock; dummy")
w := NewMockResponseWriter()
s.ServeHTTP(w, r)
if w.Status != 200 {
t.Errorf("Status was %d, should be 200.", w.Status)
}
if w.Body != strconv.Itoa(expected) {
t.Errorf("Response body was %s, should be %s.", w.Body, strconv.Itoa(expected))
}
}
func TestValidationSuccessful(t *testing.T) {
const (
A = 2
B = 3
expected = A * B
)
validate := func(info *RequestInfo, v interface{}) error { return nil }
s := NewServer()
s.RegisterService(new(Service1), "")
s.RegisterCodec(MockCodec{A, B}, "mock")
s.RegisterValidateRequestFunc(validate)
r, err := http.NewRequest("POST", "", nil)
if err != nil {
t.Fatal(err)
}
r.Header.Set("Content-Type", "mock; dummy")
w := NewMockResponseWriter()
s.ServeHTTP(w, r)
if w.Status != 200 {
t.Errorf("Status was %d, should be 200.", w.Status)
}
if w.Body != strconv.Itoa(expected) {
t.Errorf("Response body was %s, should be %s.", w.Body, strconv.Itoa(expected))
}
}
func TestValidationFails(t *testing.T) {
const expected = "this instance only supports zero values"
validate := func(r *RequestInfo, v interface{}) error {
req := v.(*Service1Request)
if req.A != 0 || req.B != 0 {
return errors.New(expected)
}
return nil
}
s := NewServer()
s.RegisterService(new(Service1), "")
s.RegisterCodec(MockCodec{1, 2}, "mock")
s.RegisterValidateRequestFunc(validate)
r, err := http.NewRequest("POST", "", nil)
if err != nil {
t.Fatal(err)
}
r.Header.Set("Content-Type", "mock; dummy")
w := NewMockResponseWriter()
s.ServeHTTP(w, r)
if w.Status != 400 {
t.Errorf("Status was %d, should be 200.", w.Status)
}
if w.Body != expected {
t.Errorf("Response body was %s, should be %s.", w.Body, expected)
}
}