/
server.go
221 lines (192 loc) · 6.2 KB
/
server.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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
package main
import "fmt"
import "io"
import "net"
import "net/http"
import "os"
import "path"
import "path/filepath"
import "github.com/willbryant/verm/mimeext"
type vermServer struct {
Listener net.Listener
Tracker *ConnectionTracker
Closed uint32
RootDataDir string
RootHttpDir http.Dir
Targets *ReplicationTargets
Statistics *LogStatistics
Quiet bool
}
func VermServer(listener net.Listener, rootDataDirectory string, replicationTargets *ReplicationTargets, statistics *LogStatistics, quiet bool) vermServer {
return vermServer{
Listener: listener,
Tracker: NewConnectionTracker(),
RootDataDir: rootDataDirectory,
RootHttpDir: http.Dir(rootDataDirectory),
Targets: replicationTargets,
Statistics: statistics,
Quiet: quiet,
}
}
func (server vermServer) serveRoot(w http.ResponseWriter, req *http.Request) {
w.WriteHeader(http.StatusOK)
io.WriteString(w,
"<!DOCTYPE html><html><head><title>Verm - Upload</title></head><body>"+
"<!-- this form will let you test out verm manually. don't emulate it in API clients - it's simpler to use raw posts. you should also insist on posting to an application-specific directory name. -->"+
"<form method='post' enctype='multipart/form-data'>"+
"<input type='hidden' name='redirect' value='1'/>" /* redirect instead of returning 201 (as APIs want) */ +
"<input type='file' name='uploaded_file'/>"+
"<input type='submit' value='Upload'/>"+
"</form>"+
"</body></html>\n")
}
func (server vermServer) serveFile(w http.ResponseWriter, req *http.Request) {
// deal with '/..' etc.
path := path.Clean(req.URL.Path)
// try and open the file
file, stat, err := server.openFile(path)
storedCompressed := false
if err != nil {
file, stat, err = server.openFile(path + ".gz")
storedCompressed = true
}
if err != nil && server.shouldForwardRead(req) && server.forwardRead(w, req) {
server.Statistics.GetRequests.Add(1)
server.Statistics.GetRequestsFoundOnReplica.Add(1)
return
}
if err != nil {
server.Statistics.GetRequests.Add(1)
server.Statistics.GetRequestsNotFound.Add(1)
http.NotFound(w, req)
return
}
defer file.Close()
defer server.Statistics.GetRequests.Add(1)
// if the client supplied cache-checking header, test them
// because verm files are immutable, we can use the path as a constant etag for the file
if checkLastModified(w, req, stat.ModTime()) || checkETag(w, req, path) {
// the client is up-to-date
w.Header().Del("Content-Length")
w.WriteHeader(http.StatusNotModified)
} else {
w.Header().Set("Last-Modified", stat.ModTime().UTC().Format(http.TimeFormat))
w.Header().Set("ETag", path)
// infer the content-type from the filename extension
contentType := mimeext.TypeByExtension(filepath.Ext(path))
if contentType == "" {
// we must set a header to avoid go sniffing the content and setting the header for us, which leads to
// problems like gzip content-encoded data getting also described as having application/x-gzip content type
w.Header().Set("Content-Type", "application/octet-stream")
} else {
w.Header().Set("Content-Type", contentType)
}
// send the file
if !storedCompressed {
serveContent(w, req, stat.Size(), file)
} else if gzipAccepted(req) {
w.Header().Set("Content-Encoding", "gzip")
serveContent(w, req, stat.Size(), file)
} else if req.Method == "HEAD" {
w.WriteHeader(http.StatusOK)
} else {
unpackAndServeContent(w, req, file)
}
}
}
func (server vermServer) openFile(path string) (http.File, os.FileInfo, error) {
file, err := server.RootHttpDir.Open(path)
if err != nil {
return nil, nil, err
}
stat, err := file.Stat()
if err != nil {
file.Close()
return nil, nil, err
}
if stat.IsDir() {
file.Close()
return nil, nil, &IsDirectoryError{path: path}
}
return file, stat, nil
}
type IsDirectoryError struct {
path string
}
func (e *IsDirectoryError) Error() string {
return e.path + " is a directory"
}
func (server vermServer) serveHTTPGetOrHead(w http.ResponseWriter, req *http.Request) {
if req.URL.Path == "/" {
server.serveRoot(w, req)
} else if req.URL.Path == "/_statistics" {
server.serveStatistics(w, req, server.Targets)
} else {
server.serveFile(w, req)
}
}
func (server vermServer) serveHTTPPost(w http.ResponseWriter, req *http.Request) {
defer server.Statistics.PostRequests.Add(1)
location, newFile, err := server.UploadFile(w, req, false)
if err != nil {
if server.Active() {
fmt.Fprintf(os.Stderr, "Error serving POST to %s: %s\n", req.URL.Path, err.Error())
}
http.Error(w, err.Error(), 500)
return
}
if newFile {
server.Statistics.PostRequestsNewFileStored.Add(1)
}
w.Header().Set("Location", location)
if req.FormValue("redirect") == "1" {
w.WriteHeader(http.StatusSeeOther)
} else {
w.WriteHeader(http.StatusCreated)
}
}
func (server vermServer) serveHTTPPut(w http.ResponseWriter, req *http.Request) {
defer server.Statistics.PutRequests.Add(1)
if req.URL.Path == ReplicationMissingFilesPath {
server.serveMissing(w, req)
server.Statistics.PutRequestsMissingFileChecks.Add(1)
return
}
location, newFile, err := server.UploadFile(w, req, true)
if err != nil {
server.Statistics.PutRequestsFailed.Add(1)
switch err.(type) {
case *WrongLocationError:
http.Error(w, err.Error(), 422)
default:
if server.Active() {
fmt.Fprintf(os.Stderr, "Error serving PUT to %s: %s\n", req.URL.Path, err.Error())
}
http.Error(w, err.Error(), 500)
}
return
}
if newFile {
server.Statistics.PutRequestsNewFileStored.Add(1)
}
w.Header().Set("Location", location)
w.WriteHeader(http.StatusCreated)
}
func (server vermServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
server.Statistics.ConnectionsCurrent.Add(1)
defer server.Statistics.ConnectionsCurrent.Add(-1)
// we need to keep track of the response code and count the bytes so we can log them below
logger := &responseLogger{w: w, req: req}
if req.Method == "GET" || req.Method == "HEAD" {
server.serveHTTPGetOrHead(logger, req)
} else if req.Method == "POST" {
server.serveHTTPPost(logger, req)
} else if req.Method == "PUT" {
server.serveHTTPPut(logger, req)
} else {
http.Error(logger, "Method not supported", 405)
}
if !server.Quiet && server.Active() {
logger.ClfLog()
}
}