dfoderick /
fullcyclereact
| Conditions | 17 |
| Paths | 6144 |
| Total Lines | 155 |
| Code Lines | 93 |
| Lines | 0 |
| Ratio | 0 % |
| Changes | 1 | ||
| Bugs | 0 | Features | 1 |
Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.
Commonly applied refactorings include:
If many parameters/temporary variables are present:
Complex classes like eventsource.js ➔ ... ➔ connect often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
| 1 | const original = require('original'); |
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| 69 | function connect() { |
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| 70 | const options = parse(url); |
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| 71 | let isSecure = options.protocol === 'https:'; |
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| 72 | options.headers = { 'Cache-Control': 'no-cache', Accept: 'text/event-stream' }; |
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| 73 | if (lastEventId) options.headers['Last-Event-ID'] = lastEventId; |
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| 74 | if (eventSourceInitDict && eventSourceInitDict.headers) { |
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| 75 | for (const i in eventSourceInitDict.headers) { |
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| 76 | const header = eventSourceInitDict.headers[i]; |
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| 77 | if (header) { |
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| 78 | options.headers[i] = header; |
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| 79 | } |
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| 80 | } |
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| 81 | } |
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| 82 | |||
| 83 | // Legacy: this should be specified as `eventSourceInitDict.https.rejectUnauthorized`, |
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| 84 | // but for now exists as a backwards-compatibility layer |
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| 85 | options.rejectUnauthorized = !(eventSourceInitDict && !eventSourceInitDict.rejectUnauthorized); |
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| 86 | |||
| 87 | // If specify http proxy, make the request to sent to the proxy server, |
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| 88 | // and include the original url in path and Host headers |
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| 89 | const useProxy = eventSourceInitDict && eventSourceInitDict.proxy; |
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| 90 | if (useProxy) { |
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| 91 | const proxy = parse(eventSourceInitDict.proxy); |
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| 92 | isSecure = proxy.protocol === 'https:'; |
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| 93 | |||
| 94 | options.protocol = isSecure ? 'https:' : 'http:'; |
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| 95 | options.path = url; |
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| 96 | options.headers.Host = options.host; |
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| 97 | options.hostname = proxy.hostname; |
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| 98 | options.host = proxy.host; |
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| 99 | options.port = proxy.port; |
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| 100 | } |
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| 101 | |||
| 102 | // If https options are specified, merge them into the request options |
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| 103 | if (eventSourceInitDict && eventSourceInitDict.https) { |
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| 104 | for (const optName in eventSourceInitDict.https) { |
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| 105 | if (httpsOptions.indexOf(optName) === -1) { |
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| 106 | continue; |
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| 107 | } |
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| 108 | |||
| 109 | const option = eventSourceInitDict.https[optName]; |
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| 110 | if (option !== undefined) { |
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| 111 | options[optName] = option; |
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| 112 | } |
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| 113 | } |
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| 114 | } |
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| 115 | |||
| 116 | // Pass this on to the XHR |
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| 117 | if (eventSourceInitDict && eventSourceInitDict.withCredentials !== undefined) { |
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| 118 | options.withCredentials = eventSourceInitDict.withCredentials; |
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| 119 | } |
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| 120 | |||
| 121 | req = (isSecure ? https : http).request(options, (res) => { |
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| 122 | // Handle HTTP errors |
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| 123 | if (res.statusCode === 500 || res.statusCode === 502 |
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| 124 | || res.statusCode === 503 || res.statusCode === 504) { |
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| 125 | _emit('error', new Event('error', { status: res.statusCode })); |
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| 126 | onConnectionClosed(); |
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| 127 | return; |
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| 128 | } |
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| 129 | |||
| 130 | // Handle HTTP redirects |
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| 131 | if (res.statusCode === 301 || res.statusCode === 307) { |
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| 132 | if (!res.headers.location) { |
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| 133 | // Server sent redirect response without Location header. |
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| 134 | _emit('error', new Event('error', { status: res.statusCode })); |
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| 135 | return; |
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| 136 | } |
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| 137 | if (res.statusCode === 307) reconnectUrl = url; |
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| 138 | url = res.headers.location; |
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| 139 | process.nextTick(connect); |
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| 140 | return; |
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| 141 | } |
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| 142 | |||
| 143 | if (res.statusCode !== 200) { |
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| 144 | _emit('error', new Event('error', { status: res.statusCode })); |
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| 145 | return self.close(); |
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| 146 | } |
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| 147 | |||
| 148 | // protect against multiple connects |
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| 149 | // https://github.com/tigertext/eventsource/commit/ca8a6e0ca0db10c23ba7bf2b7f8affaa23d7a265 |
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| 150 | if (readyState === EventSource.OPEN) { |
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| 151 | return; |
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| 152 | } |
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| 153 | |||
| 154 | readyState = EventSource.OPEN; |
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| 155 | res.on('close', () => { |
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| 156 | res.removeAllListeners('close'); |
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| 157 | res.removeAllListeners('end'); |
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| 158 | onConnectionClosed(); |
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| 159 | }); |
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| 160 | |||
| 161 | res.on('end', () => { |
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| 162 | res.removeAllListeners('close'); |
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| 163 | res.removeAllListeners('end'); |
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| 164 | onConnectionClosed(); |
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| 165 | }); |
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| 166 | _emit('open', new Event('open')); |
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| 167 | |||
| 168 | // text/event-stream parser adapted from webkit's |
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| 169 | // Source/WebCore/page/EventSource.cpp |
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| 170 | let buf = ''; |
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| 171 | res.on('data', (chunk) => { |
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| 172 | buf += chunk; |
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| 173 | |||
| 174 | let pos = 0; |
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| 175 | const length = buf.length; |
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| 176 | |||
| 177 | while (pos < length) { |
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| 178 | if (discardTrailingNewline) { |
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| 179 | if (buf[pos] === '\n') { |
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| 180 | ++pos; |
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| 181 | } |
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| 182 | discardTrailingNewline = false; |
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| 183 | } |
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| 184 | |||
| 185 | let lineLength = -1; |
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| 186 | let fieldLength = -1; |
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| 187 | var c; |
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| 188 | |||
| 189 | for (let i = pos; lineLength < 0 && i < length; ++i) { |
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| 190 | c = buf[i]; |
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| 191 | if (c === ':') { |
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| 192 | if (fieldLength < 0) { |
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| 193 | fieldLength = i - pos; |
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| 194 | } |
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| 195 | } else if (c === '\r') { |
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| 196 | discardTrailingNewline = true; |
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| 197 | lineLength = i - pos; |
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| 198 | } else if (c === '\n') { |
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| 199 | lineLength = i - pos; |
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| 200 | } |
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| 201 | } |
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| 202 | |||
| 203 | if (lineLength < 0) { |
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| 204 | break; |
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| 205 | } |
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| 206 | |||
| 207 | parseEventStreamLine(buf, pos, fieldLength, lineLength); |
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| 208 | |||
| 209 | pos += lineLength + 1; |
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| 210 | } |
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| 211 | |||
| 212 | if (pos === length) { |
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| 213 | buf = ''; |
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| 214 | } else if (pos > 0) { |
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| 215 | buf = buf.slice(pos); |
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| 216 | } |
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| 217 | }); |
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| 218 | }); |
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| 219 | |||
| 220 | req.on('error', onConnectionClosed); |
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| 221 | if (req.setNoDelay) req.setNoDelay(true); |
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| 222 | req.end(); |
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| 223 | } |
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| 224 | |||
| 404 |
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Consider adding curly braces around all statements when they are executed conditionally. This is optional if there is only one statement, but leaving them out can lead to unexpected behaviour if another statement is added later.
Consider:
If you or someone else later decides to put another statement in, only the first statement will be executed.
In this case the statement
b = 42will always be executed, while the logging statement will be executed conditionally.ensures that the proper code will be executed conditionally no matter how many statements are added or removed.