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briancbrianc
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Refactor connection to class
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‎packages/pg/lib/connection.js

Lines changed: 166 additions & 166 deletions
Original file line numberDiff line numberDiff line change
@@ -13,201 +13,201 @@ var util = require('util')
1313

1414
const { parse, serialize } = require('pg-protocol')
1515

16-
// TODO(bmc) support binary mode at some point
17-
var Connection = function (config) {
18-
EventEmitter.call(this)
19-
config = config || {}
20-
this.stream = config.stream || new net.Socket()
21-
this._keepAlive = config.keepAlive
22-
this._keepAliveInitialDelayMillis = config.keepAliveInitialDelayMillis
23-
this.lastBuffer = false
24-
this.parsedStatements = {}
25-
this.ssl = config.ssl || false
26-
this._ending = false
27-
this._emitMessage = false
28-
var self = this
29-
this.on('newListener', function (eventName) {
30-
if (eventName === 'message') {
31-
self._emitMessage = true
32-
}
33-
})
34-
}
35-
36-
util.inherits(Connection, EventEmitter)
37-
38-
Connection.prototype.connect = function (port, host) {
39-
var self = this
40-
41-
this._connecting = true
42-
this.stream.setNoDelay(true)
43-
this.stream.connect(port, host)
16+
const flushBuffer = serialize.flush()
17+
const syncBuffer = serialize.sync()
18+
const endBuffer = serialize.end()
4419

45-
this.stream.once('connect', function () {
46-
if (self._keepAlive) {
47-
self.stream.setKeepAlive(true, self._keepAliveInitialDelayMillis)
48-
}
49-
self.emit('connect')
50-
})
20+
// TODO(bmc) support binary mode at some point
21+
class Connection extends EventEmitter {
22+
constructor(config) {
23+
super()
24+
config = config || {}
25+
this.stream = config.stream || new net.Socket()
26+
this._keepAlive = config.keepAlive
27+
this._keepAliveInitialDelayMillis = config.keepAliveInitialDelayMillis
28+
this.lastBuffer = false
29+
this.parsedStatements = {}
30+
this.ssl = config.ssl || false
31+
this._ending = false
32+
this._emitMessage = false
33+
var self = this
34+
this.on('newListener', function (eventName) {
35+
if (eventName === 'message') {
36+
self._emitMessage = true
37+
}
38+
})
39+
}
5140

52-
const reportStreamError = function (error) {
53-
// errors about disconnections should be ignored during disconnect
54-
if (self._ending && (error.code === 'ECONNRESET' || error.code === 'EPIPE')) {
55-
return
56-
}
57-
self.emit('error', error)
58-
}
59-
this.stream.on('error', reportStreamError)
60-
61-
this.stream.on('close', function () {
62-
self.emit('end')
63-
})
64-
65-
if (!this.ssl) {
66-
return this.attachListeners(this.stream)
67-
}
68-
69-
this.stream.once('data', function (buffer) {
70-
var responseCode = buffer.toString('utf8')
71-
switch (responseCode) {
72-
case 'S': // Server supports SSL connections, continue with a secure connection
73-
break
74-
case 'N': // Server does not support SSL connections
75-
self.stream.end()
76-
return self.emit('error', new Error('The server does not support SSL connections'))
77-
default:
78-
// Any other response byte, including 'E' (ErrorResponse) indicating a server error
79-
self.stream.end()
80-
return self.emit('error', new Error('There was an error establishing an SSL connection'))
41+
connect(port, host) {
42+
var self = this
43+
44+
this._connecting = true
45+
this.stream.setNoDelay(true)
46+
this.stream.connect(port, host)
47+
48+
this.stream.once('connect', function () {
49+
if (self._keepAlive) {
50+
self.stream.setKeepAlive(true, self._keepAliveInitialDelayMillis)
51+
}
52+
self.emit('connect')
53+
})
54+
55+
const reportStreamError = function (error) {
56+
// errors about disconnections should be ignored during disconnect
57+
if (self._ending && (error.code === 'ECONNRESET' || error.code === 'EPIPE')) {
58+
return
59+
}
60+
self.emit('error', error)
8161
}
82-
var tls = require('tls')
83-
const options = Object.assign(
84-
{
85-
socket: self.stream,
86-
},
87-
self.ssl
88-
)
89-
if (net.isIP(host) === 0) {
90-
options.servername = host
91-
}
92-
self.stream = tls.connect(options)
93-
self.attachListeners(self.stream)
94-
self.stream.on('error', reportStreamError)
62+
this.stream.on('error', reportStreamError)
9563

96-
self.emit('sslconnect')
97-
})
98-
}
64+
this.stream.on('close', function () {
65+
self.emit('end')
66+
})
9967

100-
Connection.prototype.attachListeners = function (stream) {
101-
stream.on('end', () => {
102-
this.emit('end')
103-
})
104-
parse(stream, (msg) => {
105-
var eventName = msg.name === 'error' ? 'errorMessage' : msg.name
106-
if (this._emitMessage) {
107-
this.emit('message', msg)
68+
if (!this.ssl) {
69+
return this.attachListeners(this.stream)
10870
}
109-
this.emit(eventName, msg)
110-
})
111-
}
11271

113-
Connection.prototype.requestSsl = function () {
114-
this.stream.write(serialize.requestSsl())
115-
}
72+
this.stream.once('data', function (buffer) {
73+
var responseCode = buffer.toString('utf8')
74+
switch (responseCode) {
75+
case 'S': // Server supports SSL connections, continue with a secure connection
76+
break
77+
case 'N': // Server does not support SSL connections
78+
self.stream.end()
79+
return self.emit('error', new Error('The server does not support SSL connections'))
80+
default:
81+
// Any other response byte, including 'E' (ErrorResponse) indicating a server error
82+
self.stream.end()
83+
return self.emit('error', new Error('There was an error establishing an SSL connection'))
84+
}
85+
var tls = require('tls')
86+
const options = Object.assign(
87+
{
88+
socket: self.stream,
89+
},
90+
self.ssl
91+
)
92+
if (net.isIP(host) === 0) {
93+
options.servername = host
94+
}
95+
self.stream = tls.connect(options)
96+
self.attachListeners(self.stream)
97+
self.stream.on('error', reportStreamError)
98+
99+
self.emit('sslconnect')
100+
})
101+
}
116102

117-
Connection.prototype.startup = function (config) {
118-
this.stream.write(serialize.startup(config))
119-
}
103+
attachListeners(stream) {
104+
stream.on('end', () => {
105+
this.emit('end')
106+
})
107+
parse(stream, (msg) => {
108+
var eventName = msg.name === 'error' ? 'errorMessage' : msg.name
109+
if (this._emitMessage) {
110+
this.emit('message', msg)
111+
}
112+
this.emit(eventName, msg)
113+
})
114+
}
120115

121-
Connection.prototype.cancel = function (processID, secretKey) {
122-
this._send(serialize.cancel(processID, secretKey))
123-
}
116+
requestSsl() {
117+
this.stream.write(serialize.requestSsl())
118+
}
124119

125-
Connection.prototype.password = function (password) {
126-
this._send(serialize.password(password))
127-
}
120+
startup(config) {
121+
this.stream.write(serialize.startup(config))
122+
}
128123

129-
Connection.prototype.sendSASLInitialResponseMessage = function (mechanism, initialResponse) {
130-
this._send(serialize.sendSASLInitialResponseMessage(mechanism, initialResponse))
131-
}
124+
cancel(processID, secretKey) {
125+
this._send(serialize.cancel(processID, secretKey))
126+
}
132127

133-
Connection.prototype.sendSCRAMClientFinalMessage = function (additionalData) {
134-
this._send(serialize.sendSCRAMClientFinalMessage(additionalData))
135-
}
128+
password(password) {
129+
this._send(serialize.password(password))
130+
}
136131

137-
Connection.prototype._send = function (buffer) {
138-
if (!this.stream.writable) {
139-
return false
132+
sendSASLInitialResponseMessage(mechanism, initialResponse) {
133+
this._send(serialize.sendSASLInitialResponseMessage(mechanism, initialResponse))
140134
}
141-
return this.stream.write(buffer)
142-
}
143135

144-
Connection.prototype.query = function (text) {
145-
this._send(serialize.query(text))
146-
}
136+
sendSCRAMClientFinalMessage(additionalData) {
137+
this._send(serialize.sendSCRAMClientFinalMessage(additionalData))
138+
}
147139

148-
// send parse message
149-
Connection.prototype.parse = function (query) {
150-
this._send(serialize.parse(query))
151-
}
140+
_send(buffer) {
141+
if (!this.stream.writable) {
142+
return false
143+
}
144+
return this.stream.write(buffer)
145+
}
152146

153-
// send bind message
154-
// "more" === true to buffer the message until flush() is called
155-
Connection.prototype.bind = function (config) {
156-
this._send(serialize.bind(config))
157-
}
147+
query(text) {
148+
this._send(serialize.query(text))
149+
}
158150

159-
// send execute message
160-
// "more" === true to buffer the message until flush() is called
161-
Connection.prototype.execute = function (config) {
162-
this._send(serialize.execute(config))
163-
}
151+
// send parse message
152+
parse(query) {
153+
this._send(serialize.parse(query))
154+
}
164155

165-
const flushBuffer = serialize.flush()
166-
Connection.prototype.flush = function () {
167-
if (this.stream.writable) {
168-
this.stream.write(flushBuffer)
156+
// send bind message
157+
// "more" === true to buffer the message until flush() is called
158+
bind(config) {
159+
this._send(serialize.bind(config))
169160
}
170-
}
171161

172-
const syncBuffer = serialize.sync()
173-
Connection.prototype.sync = function () {
174-
this._ending = true
175-
this._send(flushBuffer)
176-
this._send(syncBuffer)
177-
}
162+
// send execute message
163+
// "more" === true to buffer the message until flush() is called
164+
execute(config) {
165+
this._send(serialize.execute(config))
166+
}
178167

179-
const endBuffer = serialize.end()
168+
flush() {
169+
if (this.stream.writable) {
170+
this.stream.write(flushBuffer)
171+
}
172+
}
180173

181-
Connection.prototype.end = function () {
182-
// 0x58 = 'X'
183-
this._ending = true
184-
if (!this._connecting || !this.stream.writable) {
185-
this.stream.end()
186-
return
174+
sync() {
175+
this._ending = true
176+
this._send(flushBuffer)
177+
this._send(syncBuffer)
187178
}
188-
return this.stream.write(endBuffer, () => {
189-
this.stream.end()
190-
})
191-
}
192179

193-
Connection.prototype.close = function (msg) {
194-
this._send(serialize.close(msg))
195-
}
180+
end() {
181+
// 0x58 = 'X'
182+
this._ending = true
183+
if (!this._connecting || !this.stream.writable) {
184+
this.stream.end()
185+
return
186+
}
187+
return this.stream.write(endBuffer, () => {
188+
this.stream.end()
189+
})
190+
}
196191

197-
Connection.prototype.describe = function (msg) {
198-
this._send(serialize.describe(msg))
199-
}
192+
close(msg) {
193+
this._send(serialize.close(msg))
194+
}
200195

201-
Connection.prototype.sendCopyFromChunk = function (chunk) {
202-
this._send(serialize.copyData(chunk))
203-
}
196+
describe(msg) {
197+
this._send(serialize.describe(msg))
198+
}
204199

205-
Connection.prototype.endCopyFrom = function () {
206-
this._send(serialize.copyDone())
207-
}
200+
sendCopyFromChunk(chunk) {
201+
this._send(serialize.copyData(chunk))
202+
}
208203

209-
Connection.prototype.sendCopyFail = function (msg) {
210-
this._send(serialize.copyFail(msg))
204+
endCopyFrom() {
205+
this._send(serialize.copyDone())
206+
}
207+
208+
sendCopyFail(msg) {
209+
this._send(serialize.copyFail(msg))
210+
}
211211
}
212212

213213
module.exports = Connection

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