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DRY up the static cache
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2 changed files with 35 additions and 26 deletions
1
TODO
1
TODO
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@ -5,7 +5,6 @@ add feedback for errors to UI - esp. too long
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add about page
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make asset caching optional
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todo store buffer instead of string while grabbing contents (if possible)
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write cache to use callback instead of using non-DRY code
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# shared version only
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some way to do announcements easily (and use for ads)
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@ -35,40 +35,50 @@ StaticHandler.prototype.handle = function(incPath, response) {
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// Go to index if not found or /
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if (!this.availablePaths[incPath]) incPath = this.defaultPath;
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var filePath = this.basePath + (incPath == '/' ? this.defaultPath : incPath);
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// And then stream the file back
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if (StaticHandler.cache[filePath]) {
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this.serveCached(filePath, response);
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}
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else {
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this.retrieve(filePath, response);
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}
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};
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// Retrieve from the file
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StaticHandler.prototype.retrieve = function(filePath, response) {
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var _this = this;
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fs.readFile(filePath, function(error, content) {
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if (error) {
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winston.error('unable to read file', { path: filePath, error: error.message });
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response.writeHead(500, { 'content-type': 'application/json' });
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response.end(JSON.stringify({ message: 'IO: Unable to read file' }));
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}
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else {
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// And then stream the file back - either from the cache or from source
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var cached = this.isCached(filePath);
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var method = cached ? this.serveCached : this.retrieve;
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// Run!
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method(filePath, function(error, content) {
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// Get the content
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if (content) {
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var contentType = StaticHandler.contentTypeFor(path.extname(filePath));
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response.writeHead(200, { 'content-type': contentType });
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response.end(content, 'utf-8');
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// Stick it in the cache
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StaticHandler.cache[filePath] = content;
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// Stick it in the cache if its not in there
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if (!cached) {
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StaticHandler.cache[filePath] = content;
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}
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}
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// Or break down and cry
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else {
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winston.error('unable to read file', { path: filePath, error: error });
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response.writeHead(500, { 'content-type': 'application/json' });
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response.end(JSON.stringify({ message: 'IO: Unable to read file' }));
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// If it was cached, bust the cache
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if (cached) {
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StaticHandler.cache[filePath] = null;
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}
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}
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});
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};
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// Retrieve from the file
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StaticHandler.prototype.retrieve = function(filePath, callback) {
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var _this = this;
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fs.readFile(filePath, function(error, content) {
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callback(error, content);
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});
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};
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// Retrieve from memory cache
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StaticHandler.prototype.serveCached = function(filePath, response) {
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var contentType = StaticHandler.contentTypeFor(path.extname(filePath));
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response.writeHead(200, { 'content-type': contentType });
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response.end(StaticHandler.cache[filePath], 'utf-8');
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StaticHandler.prototype.serveCached = function(filePath, callback) {
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callback(undefined, StaticHandler.cache[filePath]);
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};
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// Determine if a given filePath is cached or not
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StaticHandler.prototype.isCached = function(filePath) {
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return !!StaticHandler.cache[filePath];
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};
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module.exports = StaticHandler;
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