forked from src-d/borges
/
executor.go
134 lines (112 loc) · 2.16 KB
/
executor.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
package borges
import (
"io"
"time"
"gopkg.in/src-d/go-log.v1"
"gopkg.in/src-d/go-queue.v1"
)
// Executor retrieves jobs from an job iterator and passes them to a worker
// pool to be executed. Executor acts as a producer-consumer in a single
// component.
type Executor struct {
wp *WorkerPool
q queue.Queue
store RepositoryStore
iter JobIter
}
// NewExecutor creates a new job executor.
func NewExecutor(
q queue.Queue,
pool *WorkerPool,
store RepositoryStore, iter JobIter,
) *Executor {
return &Executor{
wp: pool,
q: q,
store: store,
iter: iter,
}
}
// Execute will queue all jobs and distribute them across the worker pool for
// them to be executed.
func (p *Executor) Execute() error {
if err := p.queueJobs(); err != nil {
return err
}
var errCh = make(chan error)
go func() {
errCh <- p.start()
}()
return <-errCh
}
func (p *Executor) start() error {
for {
if err := p.consumeJobs(); err == io.EOF {
return p.wp.Close()
} else if err != nil {
log.Errorf(err, "error consuming jobs")
}
<-time.After(5 * time.Second)
}
}
func (p *Executor) queueJobs() error {
log.Debugf("queueing jobs")
var n int
for {
job, err := p.iter.Next()
if err == io.EOF {
log.With(log.Fields{"jobs": n}).Debugf("jobs queued")
return nil
}
if err != nil {
p.logError(err)
continue
}
qj, err := queue.NewJob()
if err != nil {
return err
}
if err = qj.Encode(&job); err != nil {
return err
}
if err := p.q.Publish(qj); err != nil {
return err
}
n++
}
}
func (p *Executor) consumeJobs() error {
iter, err := p.q.Consume(p.wp.Len())
if err != nil {
return err
}
for {
j, err := iter.Next()
if queue.ErrEmptyJob.Is(err) {
p.logError(err)
continue
}
if queue.ErrAlreadyClosed.Is(err) {
return io.EOF
}
if err != nil {
return err
}
if j == nil {
_ = iter.Close()
return io.EOF
}
var job Job
if err := j.Decode(&job); err != nil {
p.logError(err)
if err := j.Reject(false); err != nil {
p.logError(err)
}
} else {
p.wp.Do(&WorkerJob{&job, j, p.q})
}
}
}
func (p *Executor) logError(err error) {
log.Errorf(err, "error occurred")
}