Merge branch 'master' into webpack-frontend

1 files changed, 225 insertions, 0 deletions

diff --git a/lib/history.js b/lib/history.js
new file mode 100644
index 00000000..4a3bbe1e
--- /dev/null
+++ b/lib/history.js
@@ -0,0 +1,225 @@
+//history
+//external modules
+var async = require('async');
+var moment = require('moment');
+
+//core
+var config = require("./config.js");
+var logger = require("./logger.js");
+var response = require("./response.js");
+var models = require("./models");
+
+//public
+var History = {
+    historyGet: historyGet,
+    historyPost: historyPost,
+    historyDelete: historyDelete,
+    isReady: isReady,
+    updateHistory: updateHistory
+};
+
+var caches = {};
+//update when the history is dirty
+var updater = setInterval(function () {
+    var deleted = [];
+    async.each(Object.keys(caches), function (key, callback) {
+        var cache = caches[key];
+        if (cache.isDirty) {
+            if (config.debug) logger.info("history updater found dirty history: " + key);
+            var history = parseHistoryToArray(cache.history);
+            finishUpdateHistory(key, history, function (err, count) {
+                if (err) return callback(err, null);
+                if (!count) return callback(null, null);
+                cache.isDirty = false;
+                cache.updateAt = Date.now();
+                return callback(null, null);
+            });
+        } else {
+            if (moment().isAfter(moment(cache.updateAt).add(5, 'minutes'))) {
+                deleted.push(key);
+            }
+            return callback(null, null);
+        }
+    }, function (err) {
+        if (err) return logger.error('history updater error', err);
+    });
+    // delete specified caches
+    for (var i = 0, l = deleted.length; i < l; i++) {
+        caches[deleted[i]].history = {};
+        delete caches[deleted[i]];
+    }
+}, 1000);
+
+function finishUpdateHistory(userid, history, callback) {
+    models.User.update({
+        history: JSON.stringify(history)
+    }, {
+        where: {
+            id: userid
+        }
+    }).then(function (count) {
+        return callback(null, count);
+    }).catch(function (err) {
+        return callback(err, null);
+    });
+}
+
+function isReady() {
+    var dirtyCount = 0;
+    async.each(Object.keys(caches), function (key, callback) {
+        if (caches[key].isDirty) dirtyCount++;
+        return callback(null, null);
+    }, function (err) {
+        if (err) return logger.error('history ready check error', err);
+    });
+    return dirtyCount > 0 ? false : true;
+}
+
+function getHistory(userid, callback) {
+    if (caches[userid]) {
+        return callback(null, caches[userid].history);
+    } else {
+        models.User.findOne({
+            where: {
+                id: userid
+            }
+        }).then(function (user) {
+            if (!user)
+                return callback(null, null);
+            var history = [];
+            if (user.history)
+                history = JSON.parse(user.history);
+            if (config.debug)
+                logger.info('read history success: ' + user.id);
+            setHistory(userid, history);
+            return callback(null, history);
+        }).catch(function (err) {
+            logger.error('read history failed: ' + err);
+            return callback(err, null);
+        });   
+    }
+}
+
+function setHistory(userid, history) {
+    if (Array.isArray(history)) history = parseHistoryToObject(history);
+    if (!caches[userid]) {
+        caches[userid] = {
+            history: {},
+            isDirty: false,
+            updateAt: Date.now()
+        };
+    }
+    caches[userid].history = history;
+}
+
+function updateHistory(userid, noteId, document) {
+    if (userid && noteId && typeof document !== 'undefined') {
+        getHistory(userid, function (err, history) {
+            if (err || !history) return;
+            if (!caches[userid].history[noteId]) {
+                caches[userid].history[noteId] = {};
+            }
+            var noteHistory = caches[userid].history[noteId];
+            var noteInfo = models.Note.parseNoteInfo(document);
+            noteHistory.id = noteId;
+            noteHistory.text = noteInfo.title;
+            noteHistory.time = moment().valueOf();
+            noteHistory.tags = noteInfo.tags;
+            caches[userid].isDirty = true;
+        });
+    }
+}
+
+function parseHistoryToArray(history) {
+    var _history = [];
+    Object.keys(history).forEach(function (key) {
+        var item = history[key];
+        _history.push(item);
+    });
+    return _history;
+}
+
+function parseHistoryToObject(history) {
+    var _history = {};
+    for (var i = 0, l = history.length; i < l; i++) {
+        var item = history[i];
+        _history[item.id] = item;
+    }
+    return _history;
+}
+
+function historyGet(req, res) {
+    if (req.isAuthenticated()) {
+        getHistory(req.user.id, function (err, history) {
+            if (err) return response.errorInternalError(res);
+            if (!history) return response.errorNotFound(res);
+            res.send({
+                history: parseHistoryToArray(history)
+            });
+        });
+    } else {
+        return response.errorForbidden(res);
+    }
+}
+
+function historyPost(req, res) {
+    if (req.isAuthenticated()) {
+        var noteId = req.params.noteId;
+        if (!noteId) {
+            if (typeof req.body['history'] === 'undefined') return response.errorBadRequest(res);
+            if (config.debug)
+                logger.info('SERVER received history from [' + req.user.id + ']: ' + req.body.history);
+            try {
+                var history = JSON.parse(req.body.history);
+            } catch (err) {
+                return response.errorBadRequest(res);
+            }
+            if (Array.isArray(history)) {
+                setHistory(req.user.id, history);
+                caches[req.user.id].isDirty = true;
+                res.end();
+            } else {
+                return response.errorBadRequest(res);
+            }
+        } else {
+            if (typeof req.body['pinned'] === 'undefined') return response.errorBadRequest(res);
+            getHistory(req.user.id, function (err, history) {
+                if (err) return response.errorInternalError(res);
+                if (!history) return response.errorNotFound(res);
+                if (!caches[req.user.id].history[noteId]) return response.errorNotFound(res);
+                if (req.body.pinned === 'true' || req.body.pinned === 'false') {
+                    caches[req.user.id].history[noteId].pinned = (req.body.pinned === 'true');
+                    caches[req.user.id].isDirty = true;
+                    res.end();
+                } else {
+                    return response.errorBadRequest(res);
+                }
+            });
+        }
+    } else {
+        return response.errorForbidden(res);
+    }
+}
+
+function historyDelete(req, res) {
+    if (req.isAuthenticated()) {
+        var noteId = req.params.noteId;
+        if (!noteId) {
+            setHistory(req.user.id, []);
+            caches[req.user.id].isDirty = true;
+            res.end();
+        } else {
+            getHistory(req.user.id, function (err, history) {
+                if (err) return response.errorInternalError(res);
+                if (!history) return response.errorNotFound(res);
+                delete caches[req.user.id].history[noteId];
+                caches[req.user.id].isDirty = true;
+                res.end();
+            });
+        }
+    } else {
+        return response.errorForbidden(res);
+    }
+}
+
+module.exports = History;
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