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debugger.go
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debugger.go
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// Copyright (C) 2016 Juniper Networks, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gohanscript
import (
"bufio"
"bytes"
"fmt"
"net"
"strings"
"gopkg.in/yaml.v2"
)
const debugPortBase = 40000
const debugPortMax = 50000
const helpMessage = "s: step, n: next, r: return, c: continue, p: print context, l: print current line\n"
//DebuggerRPC is a proecess to handle remote debuggging
type DebuggerRPC struct {
inputCh chan string
outputCh chan string
server *net.TCPListener
conn net.Conn
}
//Command accepts debug command
func (d *DebuggerRPC) Command(param []byte, ack *string) error {
d.inputCh <- string(param)
*ack = <-d.outputCh
return nil
}
func (d *DebuggerRPC) waitInput() string {
input := <-d.inputCh
input = strings.TrimRight(input, "\n")
return strings.TrimRight(input, "\r")
}
func (d *DebuggerRPC) output(message string) {
d.conn.Write([]byte(message))
}
func (d *DebuggerRPC) start() {
var addy *net.TCPAddr
for port := debugPortBase; port < debugPortMax; port++ {
addy, _ = net.ResolveTCPAddr("tcp", fmt.Sprintf("localhost:%d", port))
listener, err := net.ListenTCP("tcp", addy)
if err != nil {
continue
}
log.Info("Debugger port: telnet localhost %d", port)
conn, err := listener.Accept()
if conn == nil {
log.Warning("failed to accept debugger connection: %s", err)
return
}
d.conn = conn
go func() {
b := bufio.NewReader(conn)
for {
line, err := b.ReadString('\n')
if err != nil { // EOF, or worse
break
}
d.inputCh <- line
}
}()
return
}
}
func (d *DebuggerRPC) close() {
d.conn.Close()
d.server.Close()
}
func newDebugger() *DebuggerRPC {
d := &DebuggerRPC{
inputCh: make(chan string),
outputCh: make(chan string),
}
d.start()
return d
}
func printValue(data interface{}) string {
switch d := data.(type) {
case string:
return d
case map[string]interface{}:
var buffer bytes.Buffer
for key, value := range d {
buffer.WriteString(fmt.Sprintf("%s : %v \n", key, value))
}
return buffer.String()
case []interface{}:
var buffer bytes.Buffer
for key, value := range d {
buffer.WriteString(fmt.Sprintf("%d : %v \n", key, value))
}
return buffer.String()
default:
return fmt.Sprintf("%v\n", d)
}
}
func debugWrapper(stmt *Stmt, f func(*Context) (interface{}, error)) (func(*Context) (interface{}, error), error) {
return func(context *Context) (value interface{}, err error) {
debugNext := false
vm := context.VM
if vm.debug {
if vm.debuggerRPC == nil {
vm.debuggerRPC = newDebugger()
}
DEBUG_LOOP:
for {
currentLine := fmt.Sprintf("%s:%d %s > ", stmt.File, stmt.Line, stmt.Name)
vm.debuggerRPC.output(currentLine)
input := vm.debuggerRPC.waitInput()
commands := strings.SplitN(input, " ", 2)
switch commands[0] {
case "s":
vm.debuggerRPC.output("")
break DEBUG_LOOP
case "n":
vm.debuggerRPC.output("")
debugNext = true
vm.debug = false
break DEBUG_LOOP
case "r":
vm.debuggerRPC.output("")
vm.debugReturn = true
vm.debug = false
break DEBUG_LOOP
case "c":
vm.debuggerRPC.output("")
vm.debug = false
break DEBUG_LOOP
case "p":
if len(commands) < 2 {
vm.debuggerRPC.output(printValue(context.data))
continue
}
minigo, err := CompileExpr(commands[1])
if err != nil {
vm.debuggerRPC.output(err.Error())
continue
}
result, err := minigo.Run(context)
if err != nil {
vm.debuggerRPC.output(err.Error())
}
vm.debuggerRPC.output(printValue(result))
case "C":
vm.debuggerRPC.output(currentLine)
case "l":
yamlCode, _ := yaml.Marshal(&stmt.RawData)
vm.debuggerRPC.output(string(yamlCode))
default:
vm.debuggerRPC.output(currentLine + "\n" + helpMessage)
}
}
}
value, err = f(context)
if debugNext {
vm.debug = true
}
return
}, nil
}