wip

src/server/api/endpoints/hashtags/trend.ts

@@ -0,0 +1,78 @@
+import Note from '../../../../models/note';
+
+/**
+ * Get trends of hashtags
+ */
+module.exports = (params, user) => new Promise(async (res, rej) => {
+	// 10分
+	const interval = 1000 * 60 * 10;
+
+	const data = await Note.aggregate([{
+		$match: {
+			createdAt: {
+				$gt: new Date(Date.now() - interval)
+			},
+			tags: {
+				$exists: true,
+				$ne: []
+			}
+		}
+	}, {
+		$unwind: '$tags'
+	}, {
+		$group: {
+			_id: '$tags',
+			count: {
+				$sum: 1
+			}
+		}
+	}, {
+		$group: {
+			_id: null,
+			tags: {
+				$push: {
+					tag: '$_id',
+					count: '$count'
+				}
+			}
+		}
+	}, {
+		$project: {
+			_id: false,
+			tags: true
+		}
+	}]) as Array<{
+		tags: Array<{
+			tag: string;
+			count: number;
+		}>
+	}>;
+
+	const hots = data[0].tags
+		.sort((a, b) => a.count - b.count)
+		.map(tag => tag.tag)
+		.slice(0, 10);
+
+	const countPromises: Array<Promise<number[]>> = [];
+
+	for (let i = 0; i < 10; i++) {
+		countPromises.push(Promise.all(hots.map(tag => Note.count({
+			tags: tag,
+			createdAt: {
+				$lt: new Date(Date.now() - (interval * i)),
+				$gt: new Date(Date.now() - (interval * (i + 1)))
+			}
+		}))));
+	}
+
+	const countsLog = await Promise.all(countPromises);
+
+	const stats = hots.map((tag, i) => ({
+		tag,
+		chart: countsLog.map(counts => counts[i])
+	}));
+
+	console.log(stats);
+
+	res(stats);
+});