Small refactoring

README.md

@@ -7,13 +7,15 @@ Go 1.18+ required
 ## Features:
 
 - [x] Batch request and responses
-- [ ] WebSockets 
+- [ ] WebSocket transport
 
-## Usage
+## Usage (http transport)
 
-1. Create JSON-RPC 2.0 server:
+1. Create JSON-RPC/HTTP server:
     ```go
-    s := jsonrpc2.New()
+    import "github.com/neonxp/jsonrpc2/http"
+    ...
+    s := http.New()
     ```
 2. Write handler:
     ```go
@@ -22,15 +24,19 @@ Go 1.18+ required
     }
     ```
    Handler must have exact two arguments (context and input of any json serializable type) and exact two return values (output of any json serializable type and error)
-3. Wrap handler with `jsonrpc2.Wrap` method and register it in server:
+3. Wrap handler with `rpc.Wrap` method and register it in server:
     ```go
-    s.Register("multiply", jsonrpc2.Wrap(Multiply))
+    s.Register("multiply", rpc.Wrap(Multiply))
     ```
 4. Use server as common http handler:
     ```go
     http.ListenAndServe(":8000", s)
     ```
 
+## Custom transport
+
+See [http/server.go](/http/server.go) for example of transport implementation.
+
 ## Complete example
 
 [Full code](/examples/http)
@@ -42,13 +48,14 @@ import (
    "context"
    "net/http"
 
-	"github.com/neonxp/jsonrpc2"
+   httpRPC "github.com/neonxp/jsonrpc2/http"
+   "github.com/neonxp/jsonrpc2/rpc"
 )
 
 func main() {
-	s := jsonrpc2.New()
-	s.Register("multiply", jsonrpc2.Wrap(Multiply)) // Register handlers
-	s.Register("divide", jsonrpc2.Wrap(Divide))
+   s := httpRPC.New()
+   s.Register("multiply", rpc.Wrap(Multiply))
+   s.Register("divide", rpc.Wrap(Divide))
 
    http.ListenAndServe(":8000", s)
 }

examples/http/main.go

@@ -5,13 +5,15 @@ import (
 	"errors"
 	"net/http"
 
-	"github.com/neonxp/jsonrpc2"
+	httpRPC "github.com/neonxp/jsonrpc2/http"
+	"github.com/neonxp/jsonrpc2/rpc"
 )
 
 func main() {
-	s := jsonrpc2.New()
-	s.Register("multiply", jsonrpc2.Wrap(Multiply))
-	s.Register("divide", jsonrpc2.Wrap(Divide))
+	s := httpRPC.New()
+
+	s.Register("multiply", rpc.Wrap(Multiply))
+	s.Register("divide", rpc.Wrap(Divide))
 
 	http.ListenAndServe(":8000", s)
 }

http/server.go

@@ -0,0 +1,33 @@
+package http
+
+import (
+	"bufio"
+	"net/http"
+
+	"github.com/neonxp/jsonrpc2/rpc"
+)
+
+type Server struct {
+	*rpc.RpcServer
+}
+
+func New() *Server {
+	return &Server{RpcServer: rpc.New()}
+}
+
+func (r *Server) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
+	writer.Header().Set("Content-Type", "application/json")
+	reader := bufio.NewReader(request.Body)
+	defer request.Body.Close()
+	firstByte, err := reader.Peek(1)
+	if err != nil {
+		r.Logger.Logf("Can't read body: %v", err)
+		rpc.WriteError(rpc.ErrCodeParseError, writer)
+		return
+	}
+	if string(firstByte) == "[" {
+		r.BatchRequest(request.Context(), reader, writer)
+		return
+	}
+	r.SingleRequest(request.Context(), reader, writer)
+}

rpc/errors.go

@@ -1,4 +1,4 @@
-package jsonrpc2
+package rpc
 
 import "fmt"
 
@@ -20,7 +20,7 @@ var errorMap = map[int]string{
 	-32000: "Other error",
 }
 
-//-32000 to -32099 	Server error 	Reserved for implementation-defined server-errors.
+//-32000 to -32099 	RpcServer error 	Reserved for implementation-defined server-errors.
 
 type Error struct {
 	Code    int    `json:"code"`

rpc/logger.go

@@ -1,4 +1,4 @@
-package jsonrpc2
+package rpc
 
 import "log"
 

rpc/server.go

@@ -1,42 +1,23 @@
-package jsonrpc2
+package rpc
 
 import (
-	"bufio"
 	"context"
 	"encoding/json"
 	"io"
-	"net/http"
 	"sync"
 )
 
 const version = "2.0"
 
-type Server struct {
+type RpcServer struct {
 	Logger              Logger
 	IgnoreNotifications bool
 	handlers            map[string]Handler
 	mu                  sync.RWMutex
 }
 
-func (r *Server) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
-	writer.Header().Set("Content-Type", "application/json")
-	buf := bufio.NewReader(request.Body)
-	defer request.Body.Close()
-	firstByte, err := buf.Peek(1)
-	if err != nil {
-		r.Logger.Logf("Can't read body: %v", err)
-		writeError(ErrCodeParseError, writer)
-		return
-	}
-	if string(firstByte) == "[" {
-		r.batchRequest(writer, request, buf)
-		return
-	}
-	r.singleRequest(writer, request, buf)
-}
-
-func New() *Server {
-	return &Server{
+func New() *RpcServer {
+	return &RpcServer{
 		Logger:              nopLogger{},
 		IgnoreNotifications: true,
 		handlers:            map[string]Handler{},
@@ -44,36 +25,36 @@ func New() *Server {
 	}
 }
 
-func (r *Server) Register(method string, handler Handler) {
+func (r *RpcServer) Register(method string, handler Handler) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 	r.handlers[method] = handler
 }
 
-func (r *Server) singleRequest(writer http.ResponseWriter, request *http.Request, buf *bufio.Reader) {
+func (r *RpcServer) SingleRequest(ctx context.Context, reader io.Reader, writer io.Writer) {
 	req := new(rpcRequest)
-	if err := json.NewDecoder(buf).Decode(req); err != nil {
+	if err := json.NewDecoder(reader).Decode(req); err != nil {
 		r.Logger.Logf("Can't read body: %v", err)
-		writeError(ErrCodeParseError, writer)
+		WriteError(ErrCodeParseError, writer)
 		return
 	}
-	resp := r.callMethod(request.Context(), req)
+	resp := r.callMethod(ctx, req)
 	if req.Id == nil && r.IgnoreNotifications {
 		// notification request
 		return
 	}
 	if err := json.NewEncoder(writer).Encode(resp); err != nil {
 		r.Logger.Logf("Can't write response: %v", err)
-		writeError(ErrCodeInternalError, writer)
+		WriteError(ErrCodeInternalError, writer)
 		return
 	}
 }
 
-func (r *Server) batchRequest(writer http.ResponseWriter, request *http.Request, buf *bufio.Reader) {
+func (r *RpcServer) BatchRequest(ctx context.Context, reader io.Reader, writer io.Writer) {
 	var req []rpcRequest
-	if err := json.NewDecoder(buf).Decode(&req); err != nil {
+	if err := json.NewDecoder(reader).Decode(&req); err != nil {
 		r.Logger.Logf("Can't read body: %v", err)
-		writeError(ErrCodeParseError, writer)
+		WriteError(ErrCodeParseError, writer)
 		return
 	}
 	var responses []*rpcResponse
@@ -82,7 +63,7 @@ func (r *Server) batchRequest(writer http.ResponseWriter, request *http.Request,
 	for _, j := range req {
 		go func(req rpcRequest) {
 			defer wg.Done()
-			resp := r.callMethod(request.Context(), &req)
+			resp := r.callMethod(ctx, &req)
 			if req.Id == nil && r.IgnoreNotifications {
 				// notification request
 				return
@@ -93,11 +74,11 @@ func (r *Server) batchRequest(writer http.ResponseWriter, request *http.Request,
 	wg.Wait()
 	if err := json.NewEncoder(writer).Encode(responses); err != nil {
 		r.Logger.Logf("Can't write response: %v", err)
-		writeError(ErrCodeInternalError, writer)
+		WriteError(ErrCodeInternalError, writer)
 	}
 }
 
-func (r *Server) callMethod(ctx context.Context, req *rpcRequest) *rpcResponse {
+func (r *RpcServer) callMethod(ctx context.Context, req *rpcRequest) *rpcResponse {
 	r.mu.RLock()
 	h, ok := r.handlers[req.Method]
 	r.mu.RUnlock()
@@ -124,7 +105,7 @@ func (r *Server) callMethod(ctx context.Context, req *rpcRequest) *rpcResponse {
 	}
 }
 
-func writeError(code int, w io.Writer) {
+func WriteError(code int, w io.Writer) {
 	_ = json.NewEncoder(w).Encode(rpcResponse{
 		Jsonrpc: version,
 		Error:   NewError(code),

rpc/wrapper.go

@@ -1,4 +1,4 @@
-package jsonrpc2
+package rpc
 
 import (
 	"context"