forked from purpleidea/mgmt
/
puppet.go
137 lines (120 loc) · 3.98 KB
/
puppet.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
// Mgmt
// Copyright (C) 2013-2016+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"bufio"
"io"
"log"
"os/exec"
"strconv"
"strings"
)
const (
PuppetYAMLBufferSize = 65535
)
func runPuppetCommand(cmd *exec.Cmd) ([]byte, error) {
if DEBUG {
log.Printf("Puppet: running command: %v", cmd)
}
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Printf("Puppet: Error opening pipe to puppet command: %v", err)
return nil, err
}
stderr, err := cmd.StderrPipe()
if err != nil {
log.Printf("Puppet: Error opening error pipe to puppet command: %v", err)
return nil, err
}
if err := cmd.Start(); err != nil {
log.Printf("Puppet: Error starting puppet command: %v", err)
return nil, err
}
// XXX: the current implementation is likely prone to fail
// as soon as the YAML data overflows the buffer.
data := make([]byte, PuppetYAMLBufferSize)
var result []byte
for err == nil {
var count int
count, err = stdout.Read(data)
if err != nil && err != io.EOF {
log.Printf("Puppet: Error reading YAML data from puppet: %v", err)
return nil, err
}
// Slicing down to the number of actual bytes is important, the YAML parser
// will choke on an oversized slice. http://stackoverflow.com/a/33726617/3356612
result = append(result, data[0:count]...)
}
if DEBUG {
log.Printf("Puppet: read %v bytes of data from puppet", len(result))
}
for scanner := bufio.NewScanner(stderr); scanner.Scan(); {
log.Printf("Puppet: (output) %v", scanner.Text())
}
if err := cmd.Wait(); err != nil {
log.Printf("Puppet: Error: puppet command did not complete: %v", err)
return nil, err
}
return result, nil
}
func ParseConfigFromPuppet(puppetParam, puppetConf string) *GraphConfig {
var puppetConfArg string
if puppetConf != "" {
puppetConfArg = "--config=" + puppetConf
}
var cmd *exec.Cmd
if puppetParam == "agent" {
cmd = exec.Command("puppet", "mgmtgraph", "print", puppetConfArg)
} else if strings.HasSuffix(puppetParam, ".pp") {
cmd = exec.Command("puppet", "mgmtgraph", "print", puppetConfArg, "--manifest", puppetParam)
} else {
cmd = exec.Command("puppet", "mgmtgraph", "print", puppetConfArg, "--code", puppetParam)
}
log.Println("Puppet: launching translator")
var config GraphConfig
if data, err := runPuppetCommand(cmd); err != nil {
return nil
} else if err := config.Parse(data); err != nil {
log.Printf("Puppet: Error: Could not parse YAML output with Parse: %v", err)
return nil
}
return &config
}
func PuppetInterval(puppetConf string) int {
if DEBUG {
log.Printf("Puppet: determining graph refresh interval")
}
var cmd *exec.Cmd
if puppetConf != "" {
cmd = exec.Command("puppet", "config", "print", "runinterval", "--config", puppetConf)
} else {
cmd = exec.Command("puppet", "config", "print", "runinterval")
}
log.Println("Puppet: inspecting runinterval configuration")
interval := 1800
data, err := runPuppetCommand(cmd)
if err != nil {
log.Printf("Puppet: could not determine configured run interval (%v), using default of %v", err, interval)
return interval
}
result, err := strconv.ParseInt(strings.TrimSpace(string(data)), 10, 0)
if err != nil {
log.Printf("Puppet: error reading numeric runinterval value (%v), using default of %v", err, interval)
return interval
}
return int(result)
}