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package ami
import (
"bufio"
"bytes"
"fmt"
"io"
"strings"
"github.com/mitchellh/mapstructure"
"github.com/pkg/errors"
"github.com/wenerme/astgo/ami/amimodels"
)
type MessageType string
const (
MessageTypeAction MessageType = "Action"
MessageTypeEvent MessageType = "Event"
MessageTypeResponse MessageType = "Response"
)
type Message struct {
Type MessageType // type of message
Name string // name of message
Attributes map[string]interface{}
}
func ReadMessage(m *Message, rd io.Reader) (err error) {
r := bufio.NewReader(rd)
m.Attributes = map[string]interface{}{}
var line string
line, err = r.ReadString('\n')
if err != nil {
return err
}
RETRY:
line = strings.TrimSuffix(line, "\r\n")
if line == "" {
goto RETRY
}
sp := strings.SplitN(line, ":", 2)
if len(sp) != 2 {
return errors.Errorf("invalid type line read: %q", line)
}
m.Type = MessageType(sp[0])
m.Name = strings.TrimSpace(sp[1])
switch m.Type {
case MessageTypeAction:
case MessageTypeEvent:
case MessageTypeResponse:
default:
return errors.Errorf("invalid message type: %q", sp[0])
}
var stack [][]string
for {
// may contain BOM
line, err = r.ReadString('\n')
if err != nil {
return err
}
if line == "\r\n" {
break
}
sp = strings.SplitN(line, ":", 2)
switch {
case len(sp) == 2 && strings.HasSuffix(line, "\r\n"):
// valid line
stack = append(stack, sp)
case len(stack) == 0 && len(sp) == 2:
// first line
stack = append(stack, sp)
case len(stack) != 0:
// continue line
stack = append(stack, []string{"", line})
}
}
var k, v string
for _, pair := range stack {
switch {
case pair[0] != "" && k != "":
m.Attributes[k] = strings.TrimSuffix(v, "\r\n")
k = ""
v = ""
fallthrough
case pair[0] != "":
k = pair[0]
v = strings.TrimLeft(pair[1], " ")
case pair[0] == "":
v += pair[1]
}
}
if k != "" {
m.Attributes[k] = strings.TrimSuffix(v, "\r\n")
}
return
}
func WriteMessage(m *Message, w io.Writer) (err error) {
wr := bufio.NewWriter(w)
_, _ = wr.WriteString(fmt.Sprintf("%v: %v\r\n", m.Type, m.Name))
for k, v := range m.Attributes {
_, _ = wr.WriteString(fmt.Sprintf("%v: %v\r\n", k, v))
}
_, _ = wr.WriteString("\r\n")
err = wr.Flush()
return
}
func (m *Message) Read(r *bufio.Reader) (err error) {
return ReadMessage(m, r)
}
func (m *Message) Write(w io.Writer) (err error) {
return WriteMessage(m, w)
}
func (m Message) Format() string {
b := bytes.Buffer{}
_ = m.Write(&b)
return b.String()
}
func (m *Message) AttrString(name string) string {
if m.Attributes == nil {
return ""
}
msg := m.Attributes[name]
if msg == nil {
return ""
}
return fmt.Sprint(msg)
}
func (m *Message) Message() string {
return m.AttrString("Message")
}
func (m *Message) Success() bool {
if m.Type == MessageTypeResponse && m.Name == "Success" {
return true
}
return false
}
func (m *Message) Error() error {
if m.Type == MessageTypeResponse && m.Name == "Error" {
msg := m.Message()
if msg == "" {
msg = "error response"
}
return errors.New(msg)
}
return nil
}
func (m *Message) SetAttr(name string, val interface{}) {
if m.Attributes == nil {
m.Attributes = make(map[string]interface{})
}
m.Attributes[name] = val
}
func MustConvertToMessage(in interface{}) (msg *Message) {
m, err := ConvertToMessage(in)
if err != nil {
panic(err)
}
return m
}
func ConvertToMessage(in interface{}) (msg *Message, err error) {
msg = &Message{}
switch a := in.(type) {
case Message:
return &a, err
case *Message:
return a, err
case amimodels.Action:
msg.Type = MessageTypeAction
msg.Name = a.ActionTypeName()
case amimodels.Event:
msg.Type = MessageTypeEvent
msg.Name = a.EventTypeName()
default:
return nil, errors.Errorf("invalid type: %T", in)
}
m := make(map[string]interface{})
err = mapstructure.Decode(in, &m)
// remove zero
for k, v := range m {
rm := v == nil
// NOTE support require tag, prevent remove required empty value ?
switch v := v.(type) {
case string:
rm = v == ""
case int:
rm = v == 0
}
if rm {
delete(m, k)
}
}
msg.Attributes = m
return
}
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