Atomic write of targets file (#7)

HDegroote · Jul 19, 2024 · 1515f55 · 1515f55
1 parent 461d277
commit 1515f55
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/lib/prom-targets.js b/lib/prom-targets.js
@@ -1,4 +1,5 @@
-const fsProm = require('fs/promises')
+const fs = require('fs')
+const fsProm = fs.promises
 const idEnc = require('hypercore-id-encoding')
 
 async function writePromTargets (location, aliases) {
@@ -20,7 +21,14 @@ async function writePromTargets (location, aliases) {
     }
   ]
 
-  await fsProm.writeFile(location, JSON.stringify(content, null, 1), { encoding: 'utf-8' })
+  const tmpLocation = `${location}.tmp`
+  await fsProm.writeFile(
+    tmpLocation,
+    JSON.stringify(content, null, 1),
+    { encoding: 'utf-8' }
+  )
+
+  await fsProm.rename(tmpLocation, location) // Atomic
 }
 
 async function readPromTargets (location) {