Python compilation (#19)

* Run compiled analytics script with fallback to regular python

* Update .gitignore

* python compilation docs

.gitignore

@@ -5,7 +5,6 @@ node_modules/
 
 .vscode/
 package-lock.json
-__pycache__/
 *.pyc
 *.txt
 *.log

analytics/.gitignore

@@ -0,0 +1,4 @@
+build/
+dist/
+*.spec
+__pycache__/

analytics/Compilation.md

@@ -0,0 +1,12 @@
+# Compilation
+
+We use (pyinstaller)[https://www.pyinstaller.org/] to compile analytics unit into binary file supported by *nix systems with all the dependencies.
+
+```bash
+pip install pyinstaller
+echo "hiddenimports=['pandas._libs.tslibs.timedeltas', 'scipy._lib.messagestream']" | cat > $PYTHON_SITE_PACKAGES/PyInstaller/hooks/hook-pandas.py
+cd $HASTIC_SERVER_PATH/analytics
+pyinstaller worker.py
+```
+
+On Ubuntu 16.04 $PYTHON_SITE_PACKAGES directory located at `~/.local/lib/python3.5/site-packages`

server/src/services/analytics.ts

@@ -9,9 +9,17 @@ import {
 } from './anomalyType'
 import { getTarget } from './metrics';
 import { getLabeledSegments, insertSegments, removeSegments } from './segments';
-import { split, map, mapSync } from 'event-stream';
+import { split, mapSync } from 'event-stream';
+import * as fs from 'fs';
+import * as path from 'path';
 
-const learnWorker = spawn('python3', ['worker.py'], { cwd: ANALYTICS_PATH })
+var learnWorker;
+if(fs.existsSync(path.join(ANALYTICS_PATH, 'dist/worker/worker'))) {
+  learnWorker = spawn('dist/worker/worker', [], { cwd: ANALYTICS_PATH })
+} else {
+  // If compiled analytics script doesn't exist - fallback to regular python
+  learnWorker = spawn('python3', ['worker.py'], { cwd: ANALYTICS_PATH })
+}
 learnWorker.stdout.pipe(split()).pipe(mapSync(onMessage));
 
 learnWorker.stderr.on('data', data => console.error(`worker stderr: ${data}`));