From 8fecea073ece206cb6e828eb1e6b95ecd670eb09 Mon Sep 17 00:00:00 2001
From: Tanmoy Sen Gupta <tanmoysps@gmail.com>
Date: Thu, 19 May 2022 04:27:50 +0000
Subject: [PATCH] Added Log File Utility #39

---
 libraries/js/logsmith/lib/logFileUtility.js | 41 +++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 libraries/js/logsmith/lib/logFileUtility.js

diff --git a/libraries/js/logsmith/lib/logFileUtility.js b/libraries/js/logsmith/lib/logFileUtility.js
new file mode 100644
index 0000000..7c8995f
--- /dev/null
+++ b/libraries/js/logsmith/lib/logFileUtility.js
@@ -0,0 +1,41 @@
+import * as filesystem from 'fs'
+import ndjson from 'ndjson'
+
+function createLogFileIfNotExists(filepath) {
+    filesystem.writeFileSync(filepath, "", function (err) {
+        if (err) console.error(err);
+    })
+}
+
+// To Do: add try-catch block and callback(err) on failure
+export function writeLogToFile(log, filepath, consoleOnly) {
+    if (consoleOnly) {
+        return
+    }
+    if (!filesystem.existsSync(filepath)) {
+        createLogFileIfNotExists(filepath)
+    }
+    const stream = ndjson.stringify()
+    stream.on('data', function (logline) {
+        filesystem.appendFileSync(filepath, logline);
+    })
+    stream.write(log)
+    stream.end()
+}
+
+export function writeLogToFileOnExit(logs, filepath, consoleOnly) {
+    if (consoleOnly) {
+        return
+    }
+    if (!filesystem.existsSync(filepath)) {
+        createLogFileIfNotExists(filepath)
+    }
+    const stream = ndjson.stringify()
+    stream.on('data', function (logline) {
+        filesystem.appendFileSync(filepath, logline);
+    })
+    logs.forEach(logline => {
+        stream.write(logline)
+    });
+    stream.end()
+}
\ No newline at end of file