升级queue为task

hydro/model/task.js

@@ -0,0 +1,30 @@
+const db = require('../service/db.js');
+
+const coll = db.collection('task');
+
+async function add(task) {
+    const res = await coll.insertOne(task);
+    return res.insertedId;
+}
+
+function get(_id) {
+    return coll.findOne({ _id });
+}
+
+function count(query) {
+    return coll.find(query).count();
+}
+
+function del(_id) {
+    return coll.deleteOne({ _id });
+}
+
+async function getFirst(query) {
+    const res = await coll.find(query).sort('_id', 1).limit(1).toArray();
+    await coll.deleteOne({ _id: res[0]._id });
+    return res[0];
+}
+
+module.exports = {
+    add, get, del, count, getFirst,
+};