Anti-segments #142 (#150)

Node.js part of #142

- Merge segments while inserting
- Add deleted flag to segments

server/src/controllers/analytics_controller.ts

@@ -210,7 +210,7 @@ function processPredictionResult(analyticUnitId: AnalyticUnit.AnalyticUnitId, ta
     );
   }
 
-  let segments = payload.segments.map(segment => new Segment.Segment(analyticUnitId, segment.from, segment.to, false));
+  let segments = payload.segments.map(segment => new Segment.Segment(analyticUnitId, segment.from, segment.to, false, false));
 
   return {
     lastPredictionTime: payload.lastPredictionTime,
@@ -240,8 +240,10 @@ export async function updateSegments(
 ) {
   let [addedIds, removed] = await Promise.all([
     Segment.insertSegments(segmentsToInsert),
-    Segment.removeSegments(removedIds)
+    Segment.setSegmentsDeleted(removedIds)
   ]);
+  removed = removed.map(s => s._id);
+
   // TODO: move setting status somehow "inside" learning
   await AnalyticUnit.setStatus(id, AnalyticUnit.AnalyticUnitStatus.PENDING);
   runLearning(id).then(() => runPredict(id));

server/src/models/segment_model.ts

@@ -2,6 +2,8 @@ import { AnalyticUnitId } from './analytic_unit_model';
 
 import { Collection, makeDBQ } from '../services/data_service';
 
+import * as _ from 'lodash';
+
 let db = makeDBQ(Collection.SEGMENTS);
 
 
@@ -13,6 +15,7 @@ export class Segment {
     public from: number,
     public to: number,
     public labeled: boolean = false,
+    public deleted: boolean = false,
     public id?: SegmentId
   ) {
     if(analyticUnitId === undefined) {
@@ -38,7 +41,8 @@ export class Segment {
       analyticUnitId: this.analyticUnitId,
       from: this.from,
       to: this.to,
-      labeled: this.labeled
+      labeled: this.labeled,
+      deleted: this.deleted
     };
   }
 
@@ -49,7 +53,7 @@ export class Segment {
     return new Segment(
       obj.analyticUnitId, 
       +obj.from, +obj.to,
-      obj.labeled, obj._id
+      obj.labeled, obj.deleted, obj._id
     );
   }
 }
@@ -80,9 +84,38 @@ export async function findMany(id: AnalyticUnitId, query: FindManyQuery): Promis
 }
 
 export async function insertSegments(segments: Segment[]) {
+  let segmentIdsToRemove: SegmentId[] = [];
+  let segmentsToInsert: Segment[] = [];
+  for(let segment of segments) {
+    let intersectedSegments = await db.findMany({
+      analyticUnitId: segments[0].analyticUnitId,
+      to: { $gte: segment.from },
+      from: { $lte: segment.to },
+      labeled: segment.labeled,
+      deleted: segment.deleted
+    });
+
+    if(intersectedSegments.length > 0) {
+      let from = _.minBy(intersectedSegments, 'from').from;
+      let to = _.maxBy(intersectedSegments, 'to').to;
+      let newSegment = Segment.fromObject(segment.toObject());
+      newSegment.from = from;
+      newSegment.to = to;
+      segmentIdsToRemove = segmentIdsToRemove.concat(intersectedSegments.map(s => s._id));
+      segmentsToInsert.push(newSegment);
+    } else {
+      segmentsToInsert.push(segment);
+    }
+  }
+
+  await db.removeMany(segmentIdsToRemove);
   return db.insertMany(segments.map(s => s.toObject()));
 }
 
+export async function setSegmentsDeleted(ids: SegmentId[]) {
+  return db.updateMany(ids, { deleted: true });
+}
+
 export function removeSegments(idsToRemove: SegmentId[]) {
   return db.removeMany(idsToRemove);
 }

server/src/services/data_service.ts

@@ -17,7 +17,8 @@ export type DBQ = {
   findMany: (query: string[] | object) => Promise<any[]>,
   insertOne: (document: object) => Promise<string>,
   insertMany: (documents: object[]) => Promise<string[]>,
-  updateOne: (query: string | object, updateQuery: any) => Promise<void>,
+  updateOne: (query: string | object, updateQuery: any) => Promise<any>,
+  updateMany: (query: string[] | object, updateQuery: any) => Promise<any[]>,
   removeOne: (query: string) => Promise<boolean>
   removeMany: (query: string[] | object) => Promise<number>
 }
@@ -29,6 +30,7 @@ export function makeDBQ(collection: Collection): DBQ {
     insertOne: dbInsertOne.bind(null, collection),
     insertMany: dbInsertMany.bind(null, collection),
     updateOne: dbUpdateOne.bind(null, collection),
+    updateMany: dbUpdateMany.bind(null, collection),
     removeOne: dbRemoveOne.bind(null, collection),
     removeMany: dbRemoveMany.bind(null, collection)
   }
@@ -88,14 +90,42 @@ let dbUpdateOne = (collection: Collection, query: string | object, updateQuery:
   // https://github.com/louischatriot/nedb#updating-documents
   let nedbUpdateQuery = { $set: updateQuery }
   query = wrapIdToQuery(query);
-  return new Promise<void>((resolve, reject) => {
-    db.get(collection).update(query, nedbUpdateQuery, { /* options */ }, (err: Error) => {
-      if(err) {
-        reject(err);
-      } else {
-        resolve();
+  return new Promise<any>((resolve, reject) => {
+    db.get(collection).update(
+      query,
+      nedbUpdateQuery,
+      { returnUpdatedDocs: true },
+      (err: Error, numAffected: number, affectedDocument: any) => {
+        if(err) {
+          reject(err);
+        } else {
+          resolve(affectedDocument);
+        }
       }
-    });
+    );
+  });
+}
+
+let dbUpdateMany = (collection: Collection, query: string[] | object, updateQuery: object) => {
+  // https://github.com/louischatriot/nedb#updating-documents
+  if(isEmptyArray(query)) {
+    return Promise.resolve([]);
+  }
+  let nedbUpdateQuery = { $set: updateQuery };
+  query = wrapIdsToQuery(query);
+  return new Promise<any[]>((resolve, reject) => {
+    db.get(collection).update(
+      query,
+      nedbUpdateQuery,
+      { returnUpdatedDocs: true, multi: true },
+      (err: Error, numAffected: number, affectedDocuments: any[]) => {
+        if(err) {
+          reject(err);
+        } else {
+          resolve(affectedDocuments);
+        }
+      }
+    );
   });
 }