feat(orchestrator): add retry-on-fallback and provider init timeout

Adds retryOnFallback (retry failed builds on alternate provider) and
providerInitTimeout (swap provider if init takes too long). Refactors
run() into run()/runWithProvider() to support retry loop.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

action.yml

@@ -218,6 +218,18 @@ inputs:
     description:
       '[Orchestrator] Minimum number of idle runners required for the primary provider. If fewer are available,
       routes to fallbackProviderStrategy.'
+  retryOnFallback:
+    default: 'false'
+    required: false
+    description:
+      '[Orchestrator] When true and fallbackProviderStrategy is set, automatically retry the build on the fallback
+      provider if the primary provider fails. Useful for long builds where transient cloud failures are common.'
+  providerInitTimeout:
+    default: '0'
+    required: false
+    description:
+      '[Orchestrator] Maximum seconds to wait for the primary provider to initialize (setupWorkflow). If exceeded
+      and fallbackProviderStrategy is set, switches to the fallback. Set to 0 to disable (default).'
   resourceTracking:
     default: 'false'
     required: false

dist/index.js

@@ -331,6 +331,8 @@ class BuildParameters {
             runnerCheckEnabled: orchestrator_options_1.default.runnerCheckEnabled,
             runnerCheckLabels: orchestrator_options_1.default.runnerCheckLabels,
             runnerCheckMinAvailable: orchestrator_options_1.default.runnerCheckMinAvailable,
+            retryOnFallback: orchestrator_options_1.default.retryOnFallback,
+            providerInitTimeout: orchestrator_options_1.default.providerInitTimeout,
             buildPlatform: orchestrator_options_1.default.buildPlatform,
             kubeConfig: orchestrator_options_1.default.kubeConfig,
             containerMemory: orchestrator_options_1.default.containerMemory,
@@ -2221,6 +2223,12 @@ class OrchestratorOptions {
     static get runnerCheckMinAvailable() {
         return Number(OrchestratorOptions.getInput('runnerCheckMinAvailable')) || 1;
     }
+    static get retryOnFallback() {
+        return OrchestratorOptions.getInput('retryOnFallback') === 'true';
+    }
+    static get providerInitTimeout() {
+        return Number(OrchestratorOptions.getInput('providerInitTimeout')) || 0;
+    }
     static get containerCpu() {
         return OrchestratorOptions.getInput('containerCpu') || `1024`;
     }
@@ -2680,13 +2688,33 @@ class Orchestrator {
         if (baseImage.includes(`undefined`)) {
             throw new Error(`baseImage is undefined`);
         }
+        try {
+            return await Orchestrator.runWithProvider(buildParameters, baseImage);
+        }
+        catch (primaryError) {
+            // Retry on fallback provider if enabled and a fallback is configured
+            const fallback = buildParameters.fallbackProviderStrategy;
+            const alreadyOnFallback = buildParameters.providerStrategy === fallback;
+            if (buildParameters.retryOnFallback && fallback && !alreadyOnFallback) {
+                orchestrator_logger_1.default.log(`Primary provider '${buildParameters.providerStrategy}' failed: ${primaryError.message}`);
+                orchestrator_logger_1.default.log(`Retrying build on fallback provider '${fallback}'...`);
+                buildParameters.providerStrategy = fallback;
+                core.setOutput('providerFallbackUsed', 'true');
+                core.setOutput('providerFallbackReason', `Primary provider failed: ${primaryError.message}`);
+                return await Orchestrator.runWithProvider(buildParameters, baseImage);
+            }
+            throw primaryError;
+        }
+    }
+    static async runWithProvider(buildParameters, baseImage) {
         await Orchestrator.setup(buildParameters);
         // When aws-local mode is enabled, validate AWS CloudFormation templates
         // This ensures AWS templates are correct even when executing via local-docker
         if (Orchestrator.validateAwsTemplates) {
             await Orchestrator.validateAwsCloudFormationTemplates();
         }
-        await Orchestrator.Provider.setupWorkflow(Orchestrator.buildParameters.buildGuid, Orchestrator.buildParameters, Orchestrator.buildParameters.branch, Orchestrator.defaultSecrets);
+        // Setup workflow with optional init timeout
+        await Orchestrator.setupWorkflowWithTimeout();
         try {
             if (buildParameters.maxRetainedWorkspaces > 0) {
                 Orchestrator.lockedWorkspace = shared_workspace_locking_1.default.NewWorkspaceName();
@@ -2736,6 +2764,24 @@ class Orchestrator {
             throw error;
         }
     }
+    /**
+     * Runs setupWorkflow with an optional timeout. If providerInitTimeout is set and the
+     * provider takes longer than that to initialize, throws an error that triggers
+     * retry-on-fallback (if enabled).
+     */
+    static async setupWorkflowWithTimeout() {
+        const timeoutSeconds = Orchestrator.buildParameters.providerInitTimeout;
+        const setupPromise = Orchestrator.Provider.setupWorkflow(Orchestrator.buildParameters.buildGuid, Orchestrator.buildParameters, Orchestrator.buildParameters.branch, Orchestrator.defaultSecrets);
+        if (timeoutSeconds <= 0) {
+            await setupPromise;
+            return;
+        }
+        orchestrator_logger_1.default.log(`Provider init timeout: ${timeoutSeconds}s`);
+        const timeoutPromise = new Promise((_, reject) => {
+            setTimeout(() => reject(new Error(`Provider initialization timed out after ${timeoutSeconds}s`)), timeoutSeconds * 1000);
+        });
+        await Promise.race([setupPromise, timeoutPromise]);
+    }
     static async updateStatusWithBuildParameters() {
         const content = { ...Orchestrator.buildParameters };
         content.gitPrivateToken = ``;

src/model/build-parameters.ts

@@ -58,6 +58,8 @@ class BuildParameters {
   public runnerCheckEnabled!: boolean;
   public runnerCheckLabels!: string[];
   public runnerCheckMinAvailable!: number;
+  public retryOnFallback!: boolean;
+  public providerInitTimeout!: number;
   public gitPrivateToken!: string;
   public awsStackName!: string;
   public awsEndpoint?: string;
@@ -202,6 +204,8 @@ class BuildParameters {
       runnerCheckEnabled: OrchestratorOptions.runnerCheckEnabled,
       runnerCheckLabels: OrchestratorOptions.runnerCheckLabels,
       runnerCheckMinAvailable: OrchestratorOptions.runnerCheckMinAvailable,
+      retryOnFallback: OrchestratorOptions.retryOnFallback,
+      providerInitTimeout: OrchestratorOptions.providerInitTimeout,
       buildPlatform: OrchestratorOptions.buildPlatform,
       kubeConfig: OrchestratorOptions.kubeConfig,
       containerMemory: OrchestratorOptions.containerMemory,

src/model/orchestrator/options/orchestrator-options.ts

@@ -156,6 +156,14 @@ class OrchestratorOptions {
     return Number(OrchestratorOptions.getInput('runnerCheckMinAvailable')) || 1;
   }
 
+  static get retryOnFallback(): boolean {
+    return OrchestratorOptions.getInput('retryOnFallback') === 'true';
+  }
+
+  static get providerInitTimeout(): number {
+    return Number(OrchestratorOptions.getInput('providerInitTimeout')) || 0;
+  }
+
   static get containerCpu(): string {
     return OrchestratorOptions.getInput('containerCpu') || `1024`;
   }

src/model/orchestrator/orchestrator.ts

@@ -217,6 +217,30 @@ class Orchestrator {
     if (baseImage.includes(`undefined`)) {
       throw new Error(`baseImage is undefined`);
     }
+
+    try {
+      return await Orchestrator.runWithProvider(buildParameters, baseImage);
+    } catch (primaryError: any) {
+      // Retry on fallback provider if enabled and a fallback is configured
+      const fallback = buildParameters.fallbackProviderStrategy;
+      const alreadyOnFallback = buildParameters.providerStrategy === fallback;
+      if (buildParameters.retryOnFallback && fallback && !alreadyOnFallback) {
+        OrchestratorLogger.log(
+          `Primary provider '${buildParameters.providerStrategy}' failed: ${primaryError.message}`,
+        );
+        OrchestratorLogger.log(`Retrying build on fallback provider '${fallback}'...`);
+        buildParameters.providerStrategy = fallback;
+        core.setOutput('providerFallbackUsed', 'true');
+        core.setOutput('providerFallbackReason', `Primary provider failed: ${primaryError.message}`);
+
+        return await Orchestrator.runWithProvider(buildParameters, baseImage);
+      }
+
+      throw primaryError;
+    }
+  }
+
+  private static async runWithProvider(buildParameters: BuildParameters, baseImage: string) {
     await Orchestrator.setup(buildParameters);
 
     // When aws-local mode is enabled, validate AWS CloudFormation templates
@@ -224,12 +248,10 @@ class Orchestrator {
     if (Orchestrator.validateAwsTemplates) {
       await Orchestrator.validateAwsCloudFormationTemplates();
     }
-    await Orchestrator.Provider.setupWorkflow(
-      Orchestrator.buildParameters.buildGuid,
-      Orchestrator.buildParameters,
-      Orchestrator.buildParameters.branch,
-      Orchestrator.defaultSecrets,
-    );
+
+    // Setup workflow with optional init timeout
+    await Orchestrator.setupWorkflowWithTimeout();
+
     try {
       if (buildParameters.maxRetainedWorkspaces > 0) {
         Orchestrator.lockedWorkspace = SharedWorkspaceLocking.NewWorkspaceName();
@@ -310,6 +332,39 @@ class Orchestrator {
     }
   }
 
+  /**
+   * Runs setupWorkflow with an optional timeout. If providerInitTimeout is set and the
+   * provider takes longer than that to initialize, throws an error that triggers
+   * retry-on-fallback (if enabled).
+   */
+  private static async setupWorkflowWithTimeout() {
+    const timeoutSeconds = Orchestrator.buildParameters.providerInitTimeout;
+
+    const setupPromise = Orchestrator.Provider.setupWorkflow(
+      Orchestrator.buildParameters.buildGuid,
+      Orchestrator.buildParameters,
+      Orchestrator.buildParameters.branch,
+      Orchestrator.defaultSecrets,
+    );
+
+    if (timeoutSeconds <= 0) {
+      await setupPromise;
+
+      return;
+    }
+
+    OrchestratorLogger.log(`Provider init timeout: ${timeoutSeconds}s`);
+
+    const timeoutPromise = new Promise<never>((_, reject) => {
+      setTimeout(
+        () => reject(new Error(`Provider initialization timed out after ${timeoutSeconds}s`)),
+        timeoutSeconds * 1000,
+      );
+    });
+
+    await Promise.race([setupPromise, timeoutPromise]);
+  }
+
   private static async updateStatusWithBuildParameters() {
     const content = { ...Orchestrator.buildParameters };
     content.gitPrivateToken = ``;