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
|
package client
import (
"fmt"
"io"
"net/http"
"net/url"
"path"
"strconv"
"strings"
"time"
)
type HTTPRemoteOptions struct {
MetadataPath string
TargetsPath string
UserAgent string
Retries *HTTPRemoteRetries
}
type HTTPRemoteRetries struct {
Delay time.Duration
Total time.Duration
}
var DefaultHTTPRetries = &HTTPRemoteRetries{
Delay: time.Second,
Total: 10 * time.Second,
}
func HTTPRemoteStore(baseURL string, opts *HTTPRemoteOptions, client *http.Client) (RemoteStore, error) {
if !strings.HasPrefix(baseURL, "http") {
return nil, ErrInvalidURL{baseURL}
}
if opts == nil {
opts = &HTTPRemoteOptions{}
}
if opts.TargetsPath == "" {
opts.TargetsPath = "targets"
}
if client == nil {
client = http.DefaultClient
}
return &httpRemoteStore{baseURL, opts, client}, nil
}
type httpRemoteStore struct {
baseURL string
opts *HTTPRemoteOptions
cli *http.Client
}
func (h *httpRemoteStore) GetMeta(name string) (io.ReadCloser, int64, error) {
return h.get(path.Join(h.opts.MetadataPath, name))
}
func (h *httpRemoteStore) GetTarget(name string) (io.ReadCloser, int64, error) {
return h.get(path.Join(h.opts.TargetsPath, name))
}
func (h *httpRemoteStore) get(s string) (io.ReadCloser, int64, error) {
u := h.url(s)
req, err := http.NewRequest("GET", u, nil)
if err != nil {
return nil, 0, err
}
if h.opts.UserAgent != "" {
req.Header.Set("User-Agent", h.opts.UserAgent)
}
var res *http.Response
if r := h.opts.Retries; r != nil {
for start := time.Now(); time.Since(start) < r.Total; time.Sleep(r.Delay) {
res, err = h.cli.Do(req)
if err == nil && (res.StatusCode < 500 || res.StatusCode > 599) {
break
}
}
} else {
res, err = h.cli.Do(req)
}
if err != nil {
return nil, 0, err
}
if res.StatusCode == http.StatusNotFound {
res.Body.Close()
return nil, 0, ErrNotFound{s}
} else if res.StatusCode != http.StatusOK {
res.Body.Close()
return nil, 0, &url.Error{
Op: "GET",
URL: u,
Err: fmt.Errorf("unexpected HTTP status %d", res.StatusCode),
}
}
size, err := strconv.ParseInt(res.Header.Get("Content-Length"), 10, 0)
if err != nil {
return res.Body, -1, nil
}
return res.Body, size, nil
}
func (h *httpRemoteStore) url(path string) string {
if !strings.HasPrefix(path, "/") {
path = "/" + path
}
return h.baseURL + path
}
|
