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Diffstat (limited to 'vnfmarket/src/main/webapp/vnfmarket/node_modules/connect/lib/middleware/staticCache.js')
| -rw-r--r-- | vnfmarket/src/main/webapp/vnfmarket/node_modules/connect/lib/middleware/staticCache.js | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/vnfmarket/src/main/webapp/vnfmarket/node_modules/connect/lib/middleware/staticCache.js b/vnfmarket/src/main/webapp/vnfmarket/node_modules/connect/lib/middleware/staticCache.js deleted file mode 100644 index a37b4806..00000000 --- a/vnfmarket/src/main/webapp/vnfmarket/node_modules/connect/lib/middleware/staticCache.js +++ /dev/null @@ -1,239 +0,0 @@ - -/*! - * Connect - staticCache - * Copyright(c) 2011 Sencha Inc. - * MIT Licensed - */ - -/** - * Module dependencies. - */ - -var deprecate = require('depd')('connect'); -var utils = require('../utils') - , parseurl = require('parseurl') - , Cache = require('../cache') - , fresh = require('fresh'); -var merge = require('utils-merge'); - -/** - * Static cache: - * - * Status: Deprecated. This middleware will be removed in - * Connect 3.0. You may be interested in: - * - * - [st](https://github.com/isaacs/st) - * - * Enables a memory cache layer on top of - * the `static()` middleware, serving popular - * static files. - * - * By default a maximum of 128 objects are - * held in cache, with a max of 256k each, - * totalling ~32mb. - * - * A Least-Recently-Used (LRU) cache algo - * is implemented through the `Cache` object, - * simply rotating cache objects as they are - * hit. This means that increasingly popular - * objects maintain their positions while - * others get shoved out of the stack and - * garbage collected. - * - * Benchmarks: - * - * static(): 2700 rps - * node-static: 5300 rps - * static() + staticCache(): 7500 rps - * - * Options: - * - * - `maxObjects` max cache objects [128] - * - `maxLength` max cache object length 256kb - * - * @param {Object} options - * @return {Function} - * @api public - */ - -module.exports = function staticCache(options){ - var options = options || {} - , cache = new Cache(options.maxObjects || 128) - , maxlen = options.maxLength || 1024 * 256; - - return function staticCache(req, res, next){ - var key = cacheKey(req) - , ranges = req.headers.range - , hasCookies = req.headers.cookie - , hit = cache.get(key); - - // cache static - // TODO: change from staticCache() -> cache() - // and make this work for any request - req.on('static', function(stream){ - var headers = res._headers - , cc = utils.parseCacheControl(headers['cache-control'] || '') - , contentLength = headers['content-length'] - , hit; - - // dont cache set-cookie responses - if (headers['set-cookie']) return hasCookies = true; - - // dont cache when cookies are present - if (hasCookies) return; - - // ignore larger files - if (!contentLength || contentLength > maxlen) return; - - // don't cache partial files - if (headers['content-range']) return; - - // dont cache items we shouldn't be - // TODO: real support for must-revalidate / no-cache - if ( cc['no-cache'] - || cc['no-store'] - || cc['private'] - || cc['must-revalidate']) return; - - // if already in cache then validate - if (hit = cache.get(key)){ - if (headers.etag == hit[0].etag) { - hit[0].date = new Date; - return; - } else { - cache.remove(key); - } - } - - // validation notifiactions don't contain a steam - if (null == stream) return; - - // add the cache object - var arr = []; - - // store the chunks - stream.on('data', function(chunk){ - arr.push(chunk); - }); - - // flag it as complete - stream.on('end', function(){ - var cacheEntry = cache.add(key); - delete headers['x-cache']; // Clean up (TODO: others) - cacheEntry.push(200); - cacheEntry.push(headers); - cacheEntry.push.apply(cacheEntry, arr); - }); - }); - - if (req.method == 'GET' || req.method == 'HEAD') { - if (ranges) { - next(); - } else if (!hasCookies && hit && !mustRevalidate(req, hit)) { - res.setHeader('X-Cache', 'HIT'); - respondFromCache(req, res, hit); - } else { - res.setHeader('X-Cache', 'MISS'); - next(); - } - } else { - next(); - } - } -}; - -module.exports = deprecate.function(module.exports, - 'staticCache: use varnish or similar reverse proxy caches'); - -/** - * Respond with the provided cached value. - * TODO: Assume 200 code, that's iffy. - * - * @param {Object} req - * @param {Object} res - * @param {Object} cacheEntry - * @return {String} - * @api private - */ - -function respondFromCache(req, res, cacheEntry) { - var status = cacheEntry[0] - , headers = merge({}, cacheEntry[1]) - , content = cacheEntry.slice(2); - - headers.age = (new Date - new Date(headers.date)) / 1000 || 0; - - switch (req.method) { - case 'HEAD': - res.writeHead(status, headers); - res.end(); - break; - case 'GET': - if (fresh(req.headers, headers)) { - headers['content-length'] = 0; - res.writeHead(304, headers); - res.end(); - } else { - res.writeHead(status, headers); - - function write() { - while (content.length) { - if (false === res.write(content.shift())) { - res.once('drain', write); - return; - } - } - res.end(); - } - - write(); - } - break; - default: - // This should never happen. - res.writeHead(500, ''); - res.end(); - } -} - -/** - * Determine whether or not a cached value must be revalidated. - * - * @param {Object} req - * @param {Object} cacheEntry - * @return {String} - * @api private - */ - -function mustRevalidate(req, cacheEntry) { - var cacheHeaders = cacheEntry[1] - , reqCC = utils.parseCacheControl(req.headers['cache-control'] || '') - , cacheCC = utils.parseCacheControl(cacheHeaders['cache-control'] || '') - , cacheAge = (new Date - new Date(cacheHeaders.date)) / 1000 || 0; - - if ( cacheCC['no-cache'] - || cacheCC['must-revalidate'] - || cacheCC['proxy-revalidate']) return true; - - if (reqCC['no-cache']) return true; - - if (null != reqCC['max-age']) return reqCC['max-age'] < cacheAge; - - if (null != cacheCC['max-age']) return cacheCC['max-age'] < cacheAge; - - return false; -} - -/** - * The key to use in the cache. For now, this is the URL path and query. - * - * 'http://example.com?key=value' -> '/?key=value' - * - * @param {Object} req - * @return {String} - * @api private - */ - -function cacheKey(req) { - return parseurl(req).path; -} |