/
service.go
205 lines (165 loc) · 5.09 KB
/
service.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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
package ppc
import (
"context"
"fmt"
"io"
"io/ioutil"
"log"
"mime"
"net/http"
"os"
"strings"
"github.com/gorilla/mux"
"github.com/opentracing/opentracing-go"
log_ "github.com/opentracing/opentracing-go/log"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/turbine-kreuzberg/php-package-cache/pkg/adapter"
)
// ServiceServer executes the users requests.
type ServiceServer struct {
router *mux.Router
storage *adapter.ObjectStorage
}
// NewServiceServer creates a new service server and initiates the routes.
func NewService(storage *adapter.ObjectStorage) http.Handler {
router := mux.NewRouter()
srv := &ServiceServer{
router: router,
storage: storage,
}
srv.addRoutes()
return srv
}
func (s *ServiceServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
s.router.ServeHTTP(w, r)
}
func (s *ServiceServer) addRoutes() {
s.router.HandleFunc("/healthz/ready", Ok)
s.router.HandleFunc("/healthz/alive", Ok)
s.router.Handle("/metrics", promhttp.Handler())
s.router.HandleFunc("/downloads", Downloads)
s.router.HandleFunc("/dists/{package_group}/{package_name}/{version_normalized}/{reference}.{type}", s.Package)
}
func Ok(w http.ResponseWriter, r *http.Request) {
span, _ := opentracing.StartSpanFromContext(r.Context(), "ok")
defer span.Finish()
w.WriteHeader(http.StatusOK)
// only here to return a status 200 http codes
}
func Downloads(w http.ResponseWriter, r *http.Request) {
span, _ := opentracing.StartSpanFromContext(r.Context(), "report downlads")
defer span.Finish()
w.WriteHeader(http.StatusOK)
// ignored, informs about downloaded packages
// see https://getcomposer.org/doc/05-repositories.md#notify-batch
}
func (s *ServiceServer) Package(w http.ResponseWriter, r *http.Request) {
span, ctx := opentracing.StartSpanFromContext(r.Context(), "fetch package")
defer span.Finish()
key := r.URL.Path
vars := mux.Vars(r)
package_ := fmt.Sprintf("%s/%s", vars["package_group"], vars["package_name"])
version_normalized := vars["version_normalized"]
reference := vars["reference"]
type_ := vars["type"]
version_normalized_split := strings.Split(version_normalized, ".")
version_denormalized := fmt.Sprintf("%s.%s.%s", version_normalized_split[0], version_normalized_split[1], version_normalized_split[2])
span.LogFields(
log_.String("path", key),
log_.String("package", package_),
log_.String("version_normalized", version_normalized),
log_.String("version_denormalized", version_denormalized),
log_.String("reference", reference),
log_.String("type", type_),
)
presingedURL, err := s.storage.Presign(ctx, key)
if err != nil {
log.Printf("presigning %s: %v", key, err)
w.WriteHeader(http.StatusInternalServerError)
return
}
// file is cache
exists := s.storage.Exists(ctx, key) == nil
if exists {
http.Redirect(w, r, presingedURL, http.StatusTemporaryRedirect)
return
}
// url from meta data (packagist)
url, err := url(ctx, package_, version_normalized, reference, type_)
if err != nil {
log.Printf("lookup url for %s: %v", r.URL.Path, err)
}
err = cache(ctx, s.storage, key, url)
if err == nil {
http.Redirect(w, r, presingedURL, http.StatusTemporaryRedirect)
return
}
log.Printf("caching %s for %s: %v", url, key, err)
// fallback to repoman
repomanURL := fmt.Sprintf("https://repo.repoman.io/%s", key)
err = cache(ctx, s.storage, key, repomanURL)
if err == nil {
http.Redirect(w, r, presingedURL, http.StatusTemporaryRedirect)
return
}
log.Printf("caching %s for %s: %v", repomanURL, key, err)
// fallback to github
githubURL := fmt.Sprintf("https://codeload.github.com/%s/%s/refs/tags/%v", package_, type_, version_denormalized)
err = cache(ctx, s.storage, key, githubURL)
if err == nil {
http.Redirect(w, r, presingedURL, http.StatusTemporaryRedirect)
return
}
log.Printf("caching %s for %s: %v", githubURL, key, err)
// send found url from metadata
if url != "" {
http.Redirect(w, r, url, http.StatusTemporaryRedirect)
return
}
// failure
w.WriteHeader(http.StatusInternalServerError)
}
func cache(ctx context.Context, o *adapter.ObjectStorage, key, url string) error {
span, ctx := opentracing.StartSpanFromContext(ctx, "cache file")
defer span.Finish()
// download
file, err := fetchFile(ctx, url)
if err != nil {
return err
}
defer os.Remove(file.Name())
// upload
err = o.Upload(ctx, key, file, mime.TypeByExtension("zip"))
if err != nil {
return err
}
return nil
}
// Caller is required to cleanup the returned file.
func fetchFile(ctx context.Context, url string) (*os.File, error) {
span, _ := opentracing.StartSpanFromContext(ctx, "download file")
defer span.Finish()
client := httpClient()
resp, err := client.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("http status code %d", resp.StatusCode)
}
// create tmp file to convert ReadCloser to ReadSeeker
tmp, err := ioutil.TempFile("", "php_cache")
if err != nil {
return nil, err
}
_, err = io.Copy(tmp, resp.Body)
if err != nil {
return nil, err
}
_, err = tmp.Seek(0, io.SeekStart)
if err != nil {
return nil, err
}
return tmp, nil
}