/
s3_client.go
104 lines (90 loc) · 2.62 KB
/
s3_client.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
package multitenant
import (
"bytes"
"sync"
"context"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/prometheus/client_golang/prometheus"
"github.com/weaveworks/common/instrument"
"github.com/weaveworks/scope/report"
)
var (
s3RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: "scope",
Name: "s3_request_duration_seconds",
Help: "Time in seconds spent doing S3 requests.",
Buckets: prometheus.DefBuckets,
}, []string{"method", "status_code"})
)
// S3Store is an S3 client that stores and retrieves Reports.
type S3Store struct {
s3 *s3.S3
bucketName string
}
func registerS3ClientMetrics() {
prometheus.MustRegister(s3RequestDuration)
}
var registerS3ClientMetricsOnce sync.Once
// NewS3Client creates a new S3 client.
func NewS3Client(config *aws.Config, bucketName string) S3Store {
registerS3ClientMetricsOnce.Do(registerS3ClientMetrics)
return S3Store{
s3: s3.New(session.New(config)),
bucketName: bucketName,
}
}
// FetchReports fetches multiple reports in parallel from S3.
func (store *S3Store) FetchReports(ctx context.Context, keys []string) (map[string]report.Report, []string, error) {
type result struct {
key string
report *report.Report
err error
}
ch := make(chan result, len(keys))
for _, key := range keys {
go func(key string) {
r := result{key: key}
r.report, r.err = store.fetchReport(ctx, key)
ch <- r
}(key)
}
reports := map[string]report.Report{}
for range keys {
r := <-ch
if r.err != nil {
return nil, []string{}, r.err
}
reports[r.key] = *r.report
}
return reports, []string{}, nil
}
func (store *S3Store) fetchReport(ctx context.Context, key string) (*report.Report, error) {
var resp *s3.GetObjectOutput
err := instrument.TimeRequestHistogram(ctx, "S3.Get", s3RequestDuration, func(_ context.Context) error {
var err error
resp, err = store.s3.GetObject(&s3.GetObjectInput{
Bucket: aws.String(store.bucketName),
Key: aws.String(key),
})
return err
})
if err != nil {
return nil, err
}
defer resp.Body.Close()
return report.MakeFromBinary(ctx, resp.Body, true, true)
}
// StoreReportBytes stores a report.
func (store *S3Store) StoreReportBytes(ctx context.Context, key string, buf []byte) (int, error) {
err := instrument.TimeRequestHistogram(ctx, "S3.Put", s3RequestDuration, func(_ context.Context) error {
_, err := store.s3.PutObject(&s3.PutObjectInput{
Body: bytes.NewReader(buf),
Bucket: aws.String(store.bucketName),
Key: aws.String(key),
})
return err
})
return len(buf), err
}