feat(methods): Print stack trace when recovering from panic

methods.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"runtime"
 )
 
 // DebugMethodFunc controls whether additional debug information will be
@@ -57,9 +58,12 @@ func (method MethodFunc) call(params json.RawMessage) (res Response) {
 			res.Error = &InternalError
 			if DebugMethodFunc {
 				//res.Data = err
-				logger.Println(err)
-				logger.Printf("Params: %v", string(params))
-				logger.Printf("Return: %#v", result)
+				const size = 64 << 10
+				buf := make([]byte, size)
+				buf = buf[:runtime.Stack(buf, false)]
+				logger.Printf("jsonrpc2: panic running method %#v: %v\n%s", method, err, buf)
+				logger.Printf("jsonrpc2: Params: %v", string(params))
+				logger.Printf("jsonrpc2: Return: %#v", result)
 			}
 		}
 	}()

methods_test.go

@@ -55,8 +55,8 @@ func TestMethodFuncCall(t *testing.T) {
 		}
 		assert.Nil(res.Result, test.Name)
 	}
-	assert.Equal("MethodFunc error: Error.Code is reserved\nParams: \nReturn: jsonrpc2.Error{Code:-32601, Message:\"Method not found\", Data:interface {}(nil)}\nMethodFunc error: method returned nil\nParams: \nReturn: <nil>\nMethodFunc error: Error.Data: json: unsupported type: map[bool]bool\nParams: \nReturn: jsonrpc2.Error{Code:0, Message:\"e\", Data:map[bool]bool{true:true}}\nMethodFunc error: json: unsupported type: map[bool]bool\nParams: \nReturn: map[bool]bool{true:true}\n",
-		string(buf.Bytes()))
+	assert.Contains(string(buf.Bytes()),
+		"jsonrpc2: panic running method (jsonrpc2.MethodFunc)")
 
 	var f MethodFunc = func(_ json.RawMessage) interface{} {
 		return NewError(100, "custom", "data")