/
hooks.go
56 lines (48 loc) · 1.45 KB
/
hooks.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
package crane
import (
"os"
)
type Hooks interface {
PreStart() string
PostStart() string
PreStop() string
PostStop() string
}
type hooks struct {
RawPreStart string `json:"pre-start" yaml:"pre-start"`
RawPostStart string `json:"post-start" yaml:"post-start"`
RawPreStop string `json:"pre-stop" yaml:"pre-stop"`
RawPostStop string `json:"post-stop" yaml:"post-stop"`
// until we have a very long list, it's probably easier
// to do 4 changes in that file for each new event than
// using `go generate`
}
func (h *hooks) PreStart() string {
return os.ExpandEnv(h.RawPreStart)
}
func (h *hooks) PostStart() string {
return os.ExpandEnv(h.RawPostStart)
}
func (h *hooks) PreStop() string {
return os.ExpandEnv(h.RawPreStop)
}
func (h *hooks) PostStop() string {
return os.ExpandEnv(h.RawPostStop)
}
// Merge another set of hooks into the existing object. Existing
// hooks will be overriden if the corresponding hooks from the
// source struct are defined. Returns true if some content was
// overiden in the process.
func (h *hooks) CopyFrom(source hooks) (overriden bool) {
overrideIfFromNotEmpty := func(from string, to *string) {
if from != "" {
overriden = overriden || *to != ""
*to = from
}
}
overrideIfFromNotEmpty(source.RawPreStart, &h.RawPreStart)
overrideIfFromNotEmpty(source.RawPostStart, &h.RawPostStart)
overrideIfFromNotEmpty(source.RawPreStop, &h.RawPreStop)
overrideIfFromNotEmpty(source.RawPostStop, &h.RawPostStop)
return
}