From 5037871062c7df515a35bcf805eb4316599227f8 Mon Sep 17 00:00:00 2001
From: Evan Siroky <evan.siroky@yahoo.com>
Date: Mon, 15 Jan 2018 00:30:44 -0800
Subject: [PATCH] fix(interpolation): account for pre-interpolated stop_times

---
 lib/operations.js     | 23 +++++++++++++++++++++++
 tests/db.load.test.js | 11 +++++++++++
 2 files changed, 34 insertions(+)

diff --git a/lib/operations.js b/lib/operations.js
index 25c88f2..70c928d 100644
--- a/lib/operations.js
+++ b/lib/operations.js
@@ -62,6 +62,8 @@ function interpolateStopTimes (db, callback) {
   const querier = dbStreamer.getQuerier(streamerConfig)
   const maxUpdateConcurrency = db.trip.sequelize.getDialect() === 'sqlite' ? 1 : 100
   const updateQueue = async.queue(updateInterpolatedTimes, maxUpdateConcurrency)
+  let isComplete = false
+  let numUpdates = 0
 
   /**
    * Helper function to call upon completion of interpolation
@@ -71,11 +73,30 @@ function interpolateStopTimes (db, callback) {
       console.log('interpolation encountered an error: ', err)
       return callback(err)
     }
+    // set is complete and create a queue drain function
+    // however, a feed may not have any interpolated times, so
+    // `isComplete` is set in case nothing is pushed to the queue
+    isComplete = true
     updateQueue.drain = () => {
+      console.log('interpolation completed successfully')
       callback(err)
     }
   }
 
+  let rowTimeout
+
+  function onRowComplete () {
+    if (rowTimeout) {
+      clearTimeout(rowTimeout)
+    }
+    if (isComplete && numUpdates === 0) {
+      rowTimeout = setTimeout(() => {
+        console.log('interpolation completed successfully (no interpolations needed)')
+        callback()
+      }, 10000)
+    }
+  }
+
   // TODO: fix this cause it doesn't work w/ sqlite with a schema for some reason
   const statement = `SELECT trip_id FROM ${streamerConfig.tableName}`
   querier.execute(
@@ -111,6 +132,7 @@ function interpolateStopTimes (db, callback) {
                   lastTimepoint: lastTimepoint,
                   nextTimepoint: stopTime
                 })
+                numUpdates++
                 lookingForNextTimepoint = false
               }
             } else {
@@ -122,6 +144,7 @@ function interpolateStopTimes (db, callback) {
             }
             lastStopTime = stopTime
           })
+          onRowComplete()
         })
         .catch(onComplete)
     },
diff --git a/tests/db.load.test.js b/tests/db.load.test.js
index ba22fd2..2078183 100644
--- a/tests/db.load.test.js
+++ b/tests/db.load.test.js
@@ -131,6 +131,17 @@ describe(process.env.DIALECT, function () {
       gtfs.loadGtfs(done)
     })
 
+    it('should load a gtfs and try to interpolate stop times that do not need interpolation', function (done) {
+      var config = util.getConfig()
+      this.timeout(config.maxLoadTimeout)
+
+      config.gtfsFileOrFolder = 'only_calendar'
+      config.interpolateStopTimes = true
+
+      var gtfs = GTFS(config)
+      gtfs.loadGtfs(done)
+    })
+
     describe('with schema', () => {
       afterEach(function (done) {
         // drop and create the database before each test