fix: parallel release creation with Keygen publisher

.changeset/mighty-otters-sin.md

@@ -0,0 +1,5 @@
+---
+"app-builder-lib": patch
+---
+
+Fix issue where, upon publishing a new release, electron-builder would attempt to create the same release for each artifact in parallel, resulting in conflict errors.

packages/app-builder-lib/src/publish/KeygenPublisher.ts

@@ -181,13 +181,25 @@ export class KeygenPublisher extends HttpPublisher {
 
   private async getOrCreateRelease(): Promise<{ data?: KeygenRelease; errors?: KeygenError[] }> {
     try {
+      // First, we'll attempt to fetch the release.
       return await this.getRelease()
     } catch (e) {
-      if (e.statusCode === 404) {
-        return this.createRelease()
+      if (e.statusCode !== 404) {
+        throw e
       }
 
-      throw e
+      try {
+        // Next, if the release doesn't exist, we'll attempt to create it.
+        return await this.createRelease()
+      } catch (e) {
+        if (e.statusCode !== 409 && e.statusCode !== 422) {
+          throw e
+        }
+
+        // Lastly, when a conflict occurs (in the case of parallel uploads),
+        // we'll try to fetch it one last time.
+        return this.getRelease()
+      }
     }
   }
 

test/src/ArtifactPublisherTest.ts

@@ -32,6 +32,7 @@ function versionNumber() {
 //noinspection SpellCheckingInspection
 const token = Buffer.from("Y2Y5NDdhZDJhYzJlMzg1OGNiNzQzYzcwOWZhNGI0OTk2NWQ4ZDg3Yg==", "base64").toString()
 const iconPath = path.join(__dirname, "..", "fixtures", "test-app", "build", "icon.icns")
+const icoPath = path.join(__dirname, "..", "fixtures", "test-app", "build", "icon.ico")
 
 const publishContext: PublishContext = {
   cancellationToken: new CancellationToken(),
@@ -138,7 +139,12 @@ test.ifEnv(process.env.KEYGEN_TOKEN)("Keygen upload", async () => {
     } as KeygenOptions,
     versionNumber()
   )
-  const releaseId = await publisher.upload({ file: iconPath, arch: Arch.x64 })
+  const [releaseId] = await Promise.all([
+    publisher.upload({ file: iconPath, arch: Arch.x64 }),
+    // test parallel artifact uploads for the same release
+    publisher.upload({ file: icoPath, arch: Arch.x64 }),
+  ])
+
   await publisher.deleteRelease(releaseId)
 })