forked from proullon/ramsql
/
driver.go
200 lines (176 loc) · 4.3 KB
/
driver.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
package ramsql
import (
"database/sql"
"database/sql/driver"
"errors"
"strings"
"sync"
"time"
"github.com/IllidanTwister/ramsql/engine"
"github.com/IllidanTwister/ramsql/engine/log"
"github.com/IllidanTwister/ramsql/engine/protocol"
)
func init() {
sql.Register("ramsql", newDriver())
log.SetLevel(log.WarningLevel)
}
// Server structs holds engine for each sql.DB instance.
// This way a sql.DB cann open as much connection to engine as wanted
// without colliding with another engine (during tests for example)
// with the unique constraint of providing a unique DataSourceName
type Server struct {
endpoint protocol.DriverEndpoint
server *engine.Engine
// Kill server on last connection closing
sync.Mutex
connCount int64
}
// Driver is the driver entrypoint,
// implementing database/sql/driver interface
type Driver struct {
// Mutex protect the map of Server
sync.Mutex
// Holds all matching sql.DB instances of RamSQL engine
servers map[string]*Server
}
func newDriver() *Driver {
d := &Driver{}
d.servers = make(map[string]*Server)
return d
}
type connConf struct {
Proto string
Addr string
Laddr string
Db string
Password string
User string
Timeout time.Duration
}
// Open return an active connection so RamSQL server
// If there is no connection in pool, start a new server.
// After first instantiation of the server,
func (rs *Driver) Open(dsn string) (conn driver.Conn, err error) {
rs.Lock()
connConf, err := parseConnectionURI(dsn)
if err != nil {
rs.Unlock()
return nil, err
}
dsnServer, exist := rs.servers[dsn]
if !exist {
driverEndpoint, engineEndpoint, err := endpoints(connConf)
if err != nil {
rs.Unlock()
return nil, err
}
server, err := engine.New(engineEndpoint)
if err != nil {
rs.Unlock()
return nil, err
}
driverConn, err := driverEndpoint.New(dsn)
if err != nil {
rs.Unlock()
return nil, err
}
s := &Server{
endpoint: driverEndpoint,
server: server,
}
rs.servers[dsn] = s
rs.Unlock()
return newConn(driverConn, s), nil
}
rs.Unlock()
driverConn, err := dsnServer.endpoint.New(dsn)
return newConn(driverConn, dsnServer), err
}
func endpoints(conf *connConf) (protocol.DriverEndpoint, protocol.EngineEndpoint, error) {
switch conf.Proto {
default:
driver, engine := protocol.NewChannelEndpoints()
return driver, engine, nil
}
}
// The uri need to have the following syntax:
//
// [PROTOCOL_SPECFIIC*]DBNAME/USER/PASSWD
//
// where protocol spercific part may be empty (this means connection to
// local server using default protocol). Currently possible forms:
//
// DBNAME/USER/PASSWD
// unix:SOCKPATH*DBNAME/USER/PASSWD
// unix:SOCKPATH,OPTIONS*DBNAME/USER/PASSWD
// tcp:ADDR*DBNAME/USER/PASSWD
// tcp:ADDR,OPTIONS*DBNAME/USER/PASSWD
// cloudsql:INSTANCE*DBNAME/USER/PASSWD
//
// OPTIONS can contain comma separated list of options in form:
// opt1=VAL1,opt2=VAL2,boolopt3,boolopt4
// Currently implemented options:
// laddr - local address/port (eg. 1.2.3.4:0)
// timeout - connect timeout in format accepted by time.ParseDuration
func parseConnectionURI(uri string) (*connConf, error) {
c := &connConf{}
if uri == "" {
log.Info("Empty data source name, using 'default' engine")
uri = "default"
}
pd := strings.SplitN(uri, "*", 2)
if len(pd) == 2 {
// Parse protocol part of URI
p := strings.SplitN(pd[0], ":", 2)
if len(p) != 2 {
// Wrong protocol part of URI
return c, nil
}
c.Proto = p[0]
options := strings.Split(p[1], ",")
c.Addr = options[0]
for _, o := range options[1:] {
kv := strings.SplitN(o, "=", 2)
var k, v string
if len(kv) == 2 {
k, v = kv[0], kv[1]
} else {
k, v = o, "true"
}
switch k {
case "laddr":
c.Laddr = v
case "timeout":
to, err := time.ParseDuration(v)
if err != nil {
return nil, err
}
c.Timeout = to
default:
return nil, errors.New("Unknown option: " + k)
}
}
// Remove protocol part
pd = pd[1:]
}
// Parse database part of URI
dup := strings.SplitN(pd[0], "/", 3)
if len(dup) != 3 {
// Wrong database part of URI
return c, nil
}
c.Db = dup[0]
c.User = dup[1]
c.Password = dup[2]
return c, nil
}
func (s *Server) openingConn() {
s.Lock()
defer s.Unlock()
s.connCount++
}
func (s *Server) closingConn() {
s.Lock()
defer s.Unlock()
s.connCount--
}