b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
86 lines
2 KiB
JavaScript
Executable file
86 lines
2 KiB
JavaScript
Executable file
define(function() {
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/**
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* Convenience class and wrapper around building multiple fetching operations or
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* the aggregation of many fetching operations into a single unit of
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* operation...
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*
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*
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* var fetcher = new $bodyfetcher.BodyFetcher(
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* connection,
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* BodyParser (or any other kind of parser),
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* [
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* { uid: X, partInfo: {}, bytes: [A, B] }
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* ]
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* );
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*
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* // in all examples item is a single element in the
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* // array (third argument).
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*
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* fetcher.onparsed = function(parsed, item) {}
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* fetcher.onend = function(err) {}
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*
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*/
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function BodyFetcher(connection, parserClass, list) {
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this.connection = connection;
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this.parserClass = parserClass;
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this.list = list;
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this.pending = list.length;
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this.onparsed = null;
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this.onend = null;
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list.forEach(this._fetch, this);
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}
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BodyFetcher.prototype = {
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_fetch: function(request) {
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this.connection.listMessages(
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request.uid,
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[
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'BODY.PEEK[' + (request.partInfo.partID || '1') + ']' +
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(request.bytes ?
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'<' + request.bytes[0] + '.' + request.bytes[1] + '>' :
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'')
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],
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{ byUid: true },
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function (err, messages) {
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if (err) {
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this._resolve(err, request, null);
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} else {
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var parser = new this.parserClass(request.partInfo);
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var msg = messages[0];
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var body = null;
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for (var key in msg) {
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if (/^body/.test(key)) {
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body = msg[key];
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break;
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}
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}
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if (!body) {
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this.resolve('no body', request);
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} else {
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parser.parse(body);
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this._resolve(null, request, parser.complete());
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}
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}
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}.bind(this));
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},
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_resolve: function(err, req, result) {
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if (this.onparsed) {
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this.onparsed(err, req, result);
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}
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if (!--this.pending && this.onend) {
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this.onend();
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}
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}
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};
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return {
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BodyFetcher: BodyFetcher
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};
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});
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