/
metacmd.go
138 lines (126 loc) · 3.96 KB
/
metacmd.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
// Copyright © 2013, 2014 Hraban Luyat <hraban@0brg.net>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
package main
import (
"bytes"
"fmt"
"io"
"github.com/hraban/lush/liblush"
)
// wrapper type for custom extensions of a Cmd object
type metacmd struct{ liblush.Cmd }
type statusJson struct {
Code int `json:"code"`
ErrStr string `json:"err"`
}
type cmdmetadata struct {
Id liblush.CmdId `json:"nid"`
HtmlId string `json:"htmlid"`
Name string `json:"name"`
Cmd string `json:"cmd"`
Args []string `json:"args"`
Status statusJson `json:"status"`
StdouttoId liblush.CmdId `json:"stdoutto,omitempty"`
StderrtoId liblush.CmdId `json:"stderrto,omitempty"`
StdoutScrollback int `json:"stdoutScrollback"`
StderrScrollback int `json:"stderrScrollback"`
UserData interface{} `json:"userdata"`
Stdout string `json:"stdout"`
Stderr string `json:"stderr"`
}
// if this writer is the instream of a command return that
func iscmd(w io.Writer) liblush.Cmd {
if ins, ok := w.(liblush.InStream); ok {
return ins.Cmd()
}
return nil
}
// return command that this stream pipes to, if any
func pipedcmd(outs liblush.OutStream) liblush.Cmd {
return iscmd(outs.GetListener())
}
func cmdstatus2int(s liblush.CmdStatus) (i int) {
// not very pretty then again this entire integer status thing is bollocks
// anyway might as well abuse it all the way
if s.Err() != nil {
return 3
}
if s.Exited() == nil {
if s.Started() == nil {
i = 0
} else {
i = 1
}
} else {
if s.Success() {
i = 2
} else {
i = 3
}
}
return
}
func cmdstatus2json(s liblush.CmdStatus) (sjson statusJson) {
sjson.Code = cmdstatus2int(s)
if err := s.Err(); err != nil {
sjson.ErrStr = err.Error()
}
return
}
func stringifyWriterTo(w io.WriterTo) (string, error) {
var buf bytes.Buffer
_, err := w.WriteTo(&buf)
if err != nil {
return "", err
}
return buf.String(), nil
}
func (mc metacmd) Metadata() (data cmdmetadata, err error) {
data.Id = mc.Id()
data.HtmlId = fmt.Sprint("cmd", mc.Id())
data.Name = mc.Name()
if argv := mc.Argv(); len(argv) > 0 {
data.Cmd = argv[0]
data.Args = argv[1:]
}
data.UserData = mc.UserData()
data.StdoutScrollback = mc.Stdout().Scrollback().Size()
data.StderrScrollback = mc.Stderr().Scrollback().Size()
if cmd := pipedcmd(mc.Stdout()); cmd != nil {
data.StdouttoId = cmd.Id()
}
if cmd := pipedcmd(mc.Stderr()); cmd != nil {
data.StderrtoId = cmd.Id()
}
data.Status = cmdstatus2json(mc.Status())
data.Stdout, err = stringifyWriterTo(mc.Stdout().Scrollback())
if err != nil {
err = fmt.Errorf("failed to retrieve stdout scrollback for %d: %v",
mc.Id(), err)
return
}
data.Stderr, err = stringifyWriterTo(mc.Stderr().Scrollback())
if err != nil {
err = fmt.Errorf("failed to retrieve stderr scrollback for %d: %v",
mc.Id(), err)
return
}
return
}