-
Notifications
You must be signed in to change notification settings - Fork 4
/
pipeline.go
83 lines (71 loc) · 1.97 KB
/
pipeline.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
package pipeline
import (
"context"
"github.com/arquivei/foundationkit/app"
"github.com/arquivei/foundationkit/errors"
)
// TODO: These could be the default value, but pipeline should allow for configuring these values.
const (
// ShutdownPriorityEngine opinionated value for the engine shutdown
// priority. Change this if your app needs another value
ShutdownPriorityEngine = app.ShutdownPriority(100)
// ShutdownPriorityStream opinionated value for the input stream shutdown
// priority. Change this if your app needs another value
ShutdownPriorityStream = app.ShutdownPriority(70)
)
// Pipeline is a goduck worker that read messages, proccess them and send them to a sink.
type Pipeline interface {
Run(ctx context.Context) error
Shutdown(ctx context.Context) error
}
type pipeline struct {
engine goDuckEngine
shutdown func()
done chan struct{}
err error
}
// goDuckEngine is a basic interface for abstracting the goduck engine underneath.
type goDuckEngine interface {
Run(ctx context.Context) error
}
// MustNew returns a new pipeline but panics in case of error.
func MustNew(opts ...Option) Pipeline {
pipeline, err := New(opts...)
if err != nil {
panic(err)
}
return pipeline
}
// New returns a new pipeline.
func New(opts ...Option) (Pipeline, error) {
const op = errors.Op("pipeline.New")
var builderOpts pipelineBuilderOptions
for _, opt := range opts {
opt(&builderOpts)
}
pipeline, err := build(builderOpts)
if err != nil {
return nil, errors.E(op, err)
}
app.RegisterShutdownHandler(&app.ShutdownHandler{
Name: "pipeline",
Handler: pipeline.Shutdown,
Priority: ShutdownPriorityEngine,
})
return pipeline, nil
}
func (p *pipeline) Run(ctx context.Context) error {
defer close(p.done)
ctx, p.shutdown = context.WithCancel(ctx)
p.err = p.engine.Run(ctx)
return p.err
}
func (p *pipeline) Shutdown(ctx context.Context) error {
p.shutdown()
select {
case <-ctx.Done():
return ErrShutdown
case <-p.done:
return p.err
}
}