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feat(orchestrator): automatic provider fallback with runner availability check

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Adds built-in load balancing: check GitHub runner availability before
builds start, auto-route to a fallback provider when runners are busy
or offline. Eliminates the need for a separate check-runner job.

New inputs: fallbackProviderStrategy, runnerCheckEnabled,
runnerCheckLabels, runnerCheckMinAvailable.

Outputs providerFallbackUsed and providerFallbackReason for workflow
visibility.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
frostebite
2026-03-05 07:39:23 +00:00
parent 9d475434d3
commit 786ee3799c
7 changed files with 386 additions and 1 deletions
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src/model/orchestrator/orchestrator.ts
+35
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@@ -20,6 +20,7 @@ import { FollowLogStreamService } from './services/core/follow-log-stream-servic
import OrchestratorResult from './services/core/orchestrator-result';
import OrchestratorOptions from './options/orchestrator-options';
import ResourceTracking from './services/core/resource-tracking';
import { RunnerAvailabilityService } from './services/core/runner-availability-service';
class Orchestrator {
public static Provider: ProviderInterface;
@@ -76,6 +77,40 @@ class Orchestrator {
private static async setupSelectedBuildPlatform() {
OrchestratorLogger.log(`Orchestrator platform selected ${Orchestrator.buildParameters.providerStrategy}`);
// Check runner availability and apply fallback if needed
if (Orchestrator.buildParameters.runnerCheckEnabled && Orchestrator.buildParameters.fallbackProviderStrategy) {
const owner = OrchestratorOptions.githubOwner;
const repo = OrchestratorOptions.githubRepoName;
const token = Orchestrator.buildParameters.gitPrivateToken || process.env.GITHUB_TOKEN || '';
OrchestratorLogger.log(
`Checking runner availability (labels: [${Orchestrator.buildParameters.runnerCheckLabels.join(', ')}], min: ${Orchestrator.buildParameters.runnerCheckMinAvailable})`,
);
const result = await RunnerAvailabilityService.checkAvailability(
owner,
repo,
token,
Orchestrator.buildParameters.runnerCheckLabels,
Orchestrator.buildParameters.runnerCheckMinAvailable,
);
OrchestratorLogger.log(
`Runner check: ${result.totalRunners} total, ${result.matchingRunners} matching, ${result.idleRunners} idle — ${result.reason}`,
);
if (result.shouldFallback) {
const original = Orchestrator.buildParameters.providerStrategy;
const fallback = Orchestrator.buildParameters.fallbackProviderStrategy;
OrchestratorLogger.log(`Falling back from '${original}' to '${fallback}' — ${result.reason}`);
Orchestrator.buildParameters.providerStrategy = fallback;
core.setOutput('providerFallbackUsed', 'true');
core.setOutput('providerFallbackReason', result.reason);
} else {
core.setOutput('providerFallbackUsed', 'false');
}
}
// Detect LocalStack endpoints and handle AWS provider appropriately
// AWS_FORCE_PROVIDER options:
// - 'aws': Force AWS provider (requires LocalStack Pro with ECS support)