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*shenans* refactored Posts.get to use async module instead of callback
pyramid. Call time net decrease = 0, rofl.
This commit is contained in:
Julian Lam
230
src/posts.js
230
src/posts.js
@@ -19,122 +19,134 @@ var RDB = require('./redis.js'),
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if (start == null) start = 0;
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if (end == null) end = start + 10;
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// async.parallel({
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// details: function(callback) {
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// RDB.get('tid:' + tid + ':title', function(topic_name) {
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// callback(null, {
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// 'topic_name': topic_name
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// });
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// });
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// },
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// posts: function(callback) {
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// var participant_uids = [],
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// post_calls = [];
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// RDB.lrange('tid:' + tid + ':posts', start, end, function(pids) {
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// var content = [],
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// uid = [],
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// timestamp = [],
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// pid = [],
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// post_rep = [];
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async.parallel({
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details: function(callback) {
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RDB.get('tid:' + tid + ':title', function(topic_name) {
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callback(null, {
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'topic_name': topic_name
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});
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});
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},
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posts: function(callback) {
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var participant_uids = [],
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post_calls = [];
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async.waterfall([
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function(next) {
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RDB.lrange('tid:' + tid + ':posts', start, end, function(pids) {
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var content = [],
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uids = [],
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participants = [],
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timestamp = [],
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pid = [],
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post_rep = [];
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// for (var i=0, ii=pids.length; i<ii; i++) {
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// content.push('pid:' + pids[i] + ':content');
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// uid.push('pid:' + pids[i] + ':uid');
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// timestamp.push('pid:' + pids[i] + ':timestamp');
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// post_rep.push('pid:' + pids[i] + ':rep');
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// pid.push(pids[i]);
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// }
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for (var i=0, ii=pids.length; i<ii; i++) {
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content.push('pid:' + pids[i] + ':content');
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uids.push('pid:' + pids[i] + ':uid');
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timestamp.push('pid:' + pids[i] + ':timestamp');
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post_rep.push('pid:' + pids[i] + ':rep');
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pid.push(pids[i]);
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}
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// if (pids.length > 0) {
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// RDB.multi()
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// .mget(content)
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// .mget(uid)
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// .mget(timestamp)
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// .mget(post_rep)
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// .exec(function(err, replies) {
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// content = replies[0];
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// uid = replies[1];
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// timestamp = replies[2];
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// post_rep = replies[3];
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if (pids.length > 0) {
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RDB.multi()
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.mget(content)
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.mget(uids)
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.mget(timestamp)
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.mget(post_rep)
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.exec(function(err, replies) {
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// Populate uids array
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for(var x=0,numReplies=replies[1].length;x<numReplies;x++) {
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var uid = parseInt(replies[1][x]);
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if (participants.indexOf(uid) === -1) participants.push(uid);
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}
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// callback(null, replies);
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// }
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// );
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// }
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// });
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// }
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// }, function(err, results) {
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// callback(results);
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// });
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// return;
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RDB.get('tid:' + tid + ':title', function(topic_name) { //do these asynch later
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RDB.lrange('tid:' + tid + ':posts', start, end, function(pids) {
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var content = [],
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uid = [],
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timestamp = [],
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pid = [],
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post_rep = [];
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for (var i=0, ii=pids.length; i<ii; i++) {
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content.push('pid:' + pids[i] + ':content');
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uid.push('pid:' + pids[i] + ':uid');
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timestamp.push('pid:' + pids[i] + ':timestamp');
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post_rep.push('pid:' + pids[i] + ':rep');
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pid.push(pids[i]);
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}
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if (pids.length > 0) {
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RDB.multi()
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.mget(content)
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.mget(uid)
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.mget(timestamp)
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.mget(post_rep)
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.exec(function(err, replies) {
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content = replies[0];
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uid = replies[1];
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timestamp = replies[2];
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post_rep = replies[3];
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user.get_user_postdetails(uid, function(user_details) {
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user.get_gravatars_by_uids(uid, '', function(gravatars) {
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var posts = [];
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var callbacks = content.length;
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for (var i=0, ii=content.length; i<ii; i++) {
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(function(i) {
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Posts.hasFavourited(pid[i], current_user, function(hasFavourited) {
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posts.push({
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'pid' : pid[i],
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'content' : marked(content[i] || ''),
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'uid' : uid[i],
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'username' : user_details.username[i] || 'anonymous',
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'user_rep' : user_details.rep[i] || 0,
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'post_rep' : post_rep[i] || 0,
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'gravatar' : gravatars[i],
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'timestamp' : timestamp[i],
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'relativeTime': utils.relativeTime(timestamp[i]),
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'fav_star_class' : hasFavourited ? 'icon-star' : 'icon-star-empty',
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'display_moderator_tools' : uid[i] === current_user ? 'show' : 'hide'
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});
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callbacks--;
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if (callbacks == 0) {
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callback({'topic_name':topic_name, 'topic_id': tid, 'posts': posts});
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}
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});
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}(i));
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// Construct return object
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next(null, {
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replies: replies,
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pids: pids,
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participants: participants
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});
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}
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});
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});
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);
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}
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});
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} else {
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callback({});
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}
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}, function(returnObj, next) {
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// Get user details
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var details = {},
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calls = [];
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for(var x=0,numParticipants=returnObj.participants.length;x<numParticipants;x++) {
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(function(uid) {
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calls.push(function(next) {
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// Get individual participant's details
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user.getUserData(uid, function(userData) {
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next(null, userData);
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})
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});
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})(returnObj.participants[x]);
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}
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async.parallel(calls, function(err, results) {
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for(var x=0,numResults=results.length;x<numResults;x++) {
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details[returnObj.participants[x]] = results[x];
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}
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returnObj.participants = details;
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next(null, returnObj);
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});
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}, function(returnObj, next) {
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// Favourited?
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var calls = [],
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numPosts = returnObj.pids.length;
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for(var x=0;x<numPosts;x++) {
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(function(pid) {
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calls.push(function(callback) {
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Posts.hasFavourited(pid, current_user, function(hasFavourited) {
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callback(null, hasFavourited);
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});
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});
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})(returnObj.pids[x]);
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}
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async.parallel(calls, function(err, results) {
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returnObj.favourites = results;
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next(null, returnObj);
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});
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}
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], function(err, returnObj) {
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callback(null, returnObj);
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});
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}
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}, function(err, results) {
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// Construct posts array
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var posts = [],
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participant_details = results.posts.participants;
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for(var x=0,numPosts=results.posts.pids.length;x<numPosts;x++) {
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var uid = results.posts.replies[1][x],
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participant = participant_details[uid];
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posts.push({
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pid: results.posts.pids[x],
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content: marked(results.posts.replies[0][x] || ''),
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uid: uid,
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timestamp: results.posts.replies[2][x],
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relativeTime: utils.relativeTime(results.posts.replies[2][x]),
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post_rep: results.posts.replies[3][x],
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display_moderator_tools: results.posts.replies[1][x] === current_user ? 'show' : 'hide',
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username: participant.username,
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gravatar: participant.picture,
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user_rep: participant.reputation,
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fav_star_class: results.posts.favourites[x] ? 'icon-star' : 'icon-star-empty',
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});
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}
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// Construct return object
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callback({
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'topic_name': results.details.topic_name,
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'topic_id': tid,
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posts: posts,
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uids: results.posts.participants
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});
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});
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}
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