-
Notifications
You must be signed in to change notification settings - Fork 2
/
resolver.go
210 lines (179 loc) · 5.67 KB
/
resolver.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
// MIT License
//
// Copyright (c) 2020 The vine Authors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package web
import (
"errors"
"net"
"net/http"
"regexp"
"strings"
"github.com/vine-io/vine/core/client/selector"
res "github.com/vine-io/vine/lib/api/resolver"
"github.com/vine-io/vine/util/namespace"
"golang.org/x/net/publicsuffix"
)
var (
re = regexp.MustCompile("^[a-zA-Z0-9]+([a-zA-Z0-9-]*[a-zA-Z0-9]*)?$")
defaultNamespace = namespace.DefaultNamespace + ".web"
)
type Resolver struct {
// Type of resolver e.g path, domain
Type string
// a function which returns the namespace of the request
Namespace func(req *http.Request) string
// selector to find services
Selector selector.Selector
}
func reverse(s []string) {
for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
s[i], s[j] = s[j], s[i]
}
}
func (r *Resolver) String() string {
return "web/resolver"
}
// Info checks whether this is a web request.
// It returns host, namespace and whether its internal
func (r *Resolver) Info(req *http.Request) (string, string, bool) {
// set to host
host := req.URL.Hostname()
// set as req.Host if blank
if len(host) == 0 {
host = req.Host
}
// split out ip
if h, _, err := net.SplitHostPort(host); err == nil {
host = h
}
// determine the namespace of the request
namespace := r.Namespace(req)
// overide host if the namespace is go.vine.web, since
// this will also catch localhost & 127.0.0.1, resulting
// in a more consistent dev experience
if host == "localhost" || host == "127.0.0.1" {
host = "web.vine.mu"
}
// if the type is path, always resolve using the path
if r.Type == "path" {
return host, namespace, true
}
// if the namespace is not the default (go.vine.web),
// we always resolve using path
if namespace != defaultNamespace {
return host, namespace, true
}
// check for vine subdomains, we want to do subdomain routing
// on these if the subdomoain routing has been specified
if r.Type == "subdomain" && host != "web.vine.mu" && strings.HasSuffix(host, ".vine.mu") {
return host, namespace, false
}
// Check for services info path, also handled by vine web but
// not a top level path. TODO: Find a better way of detecting and
// handling the non-proxied paths.
if strings.HasPrefix(req.URL.Path, "/service/") {
return host, namespace, true
}
// Check if the request is a top level path
isWeb := strings.Count(req.URL.Path, "/") == 1
return host, namespace, isWeb
}
// Resolve replaces the values of Host, Path, Scheme to calla backend service
// It accounts for subdomains for service names based on namespace
func (r *Resolver) Resolve(req *http.Request) (*res.Endpoint, error) {
// get host, namespace and if its an internal request
host, _, _ := r.Info(req)
// check for vine web
if r.Type == "path" || host == "web.vine.mu" {
return r.resolveWithPath(req)
}
domain, err := publicsuffix.EffectiveTLDPlusOne(host)
if err != nil {
return nil, err
}
// get and reverse the subdomain
subdomain := strings.TrimSuffix(host, "."+domain)
parts := strings.Split(subdomain, ".")
reverse(parts)
// turn it into an alias
alias := strings.Join(parts, ".")
if len(alias) == 0 {
return nil, errors.New("unknown host")
}
var name string
if strings.HasSuffix(host, ".vine.mu") {
// for vine.mu subdomains, we route foo.vine.mu/bar to
// go.vine.web.bar
name = defaultNamespace + "." + alias
} else if comps := strings.Split(req.URL.Path, "/"); len(comps) > 0 {
// for non vine.mu subdomains, we route foo.m3o.app/bar to
// foo.web.bar
name = alias + ".web." + comps[1]
}
// find the service using the selector
next, err := r.Selector.Select(name)
if err == selector.ErrNotFound {
// fallback to path based
return r.resolveWithPath(req)
} else if err != nil {
return nil, err
}
// TODO: better retry strategy
s, err := next()
if err != nil {
return nil, err
}
// we're done
return &res.Endpoint{
Name: alias,
Method: req.Method,
Host: s.Address,
Path: req.URL.Path,
}, nil
}
func (r *Resolver) resolveWithPath(req *http.Request) (*res.Endpoint, error) {
parts := strings.Split(req.URL.Path, "/")
if len(parts) < 2 {
return nil, errors.New("unknown service")
}
if !re.MatchString(parts[1]) {
return nil, res.ErrInvalidPath
}
_, namespace, _ := r.Info(req)
next, err := r.Selector.Select(namespace + "." + parts[1])
if err == selector.ErrNotFound {
return nil, res.ErrNotFound
} else if err != nil {
return nil, err
}
// TODO: better retry strategy
s, err := next()
if err != nil {
return nil, err
}
// we're done
return &res.Endpoint{
Name: parts[1],
Method: req.URL.Path,
Host: s.Address,
Path: "/" + strings.Join(parts[2:], "/"),
}, nil
}