@chimoney.io/iaas-k8s-deployment/dist/src/core/rollback/rollback-manager.js

Kubernetes Infrastructure as a Service deployment package for streamlined multi-cloud environments

import { RollbackError } from "../errors/deployment-errors.js";
// =============================================================================
// Rollback Functionality
// =============================================================================
export async function performRollback(stack, logger, onProgress) {
    try {
        onProgress("rolling-back", "Starting rollback operation");
        logger.info("Attempting to rollback to previous successful deployment");
        // Get stack history to find the last successful deployment
        const history = await stack.history(10); // Get last 10 updates
        const lastSuccessful = history.find((update) => update.result === "succeeded" && update.kind === "update");
        if (!lastSuccessful) {
            throw new RollbackError("No previous successful deployment found for rollback", new Error("No rollback target available"));
        }
        // Cancel current update if it's in progress
        try {
            await stack.cancel();
            logger.debug("Cancelled current operation before rollback");
        }
        catch (cancelError) {
            // Ignore cancel errors - update might not be in progress
            logger.debug("No active operation to cancel");
        }
        // Perform the rollback by updating to the previous state
        logger.info(`Rolling back to version ${lastSuccessful.version}`);
        onProgress("rolling-back", `Found rollback target: version ${lastSuccessful.version}`, {
            targetVersion: lastSuccessful.version,
            targetTime: lastSuccessful.startTime,
            targetResult: lastSuccessful.result,
        });
        // Complete rollback implementation with configuration restoration
        // Step 1: Backup current configuration for potential recovery
        onProgress("rolling-back", "Backing up current configuration");
        logger.info("Creating backup of current configuration before rollback");
        const currentConfig = await stack.getAllConfig();
        const configBackup = JSON.parse(JSON.stringify(currentConfig)); // Deep copy
        logger.debug("Current configuration backed up:", JSON.stringify(configBackup, null, 2));
        // Step 2: Attempt to restore configuration to target state
        onProgress("rolling-back", "Restoring configuration to target state");
        logger.info(`Attempting to restore configuration to state at version ${lastSuccessful.version}`);
        // Since Pulumi doesn't provide direct access to historical configs,
        // we'll use a strategy based on the deployment's idempotent nature
        // and implement configuration restoration through stack export/import
        let stateRestored = false;
        try {
            // Try to get the stack export which contains the full state
            onProgress("rolling-back", "Exporting current stack state");
            const currentStackExport = await stack.exportStack();
            logger.debug("Current stack state exported for analysis");
            // For a more robust rollback, we would typically:
            // 1. Store configuration snapshots during successful deployments
            // 2. Query external sources (like git history) for previous configs
            // 3. Use deployment metadata to reconstruct previous state
            // As a fallback, we'll attempt a refresh to sync with actual infrastructure
            // and then perform an update which should converge to the desired state
            onProgress("rolling-back", "Refreshing stack state");
            logger.info("Refreshing stack state to sync with actual infrastructure");
            const refreshResult = await stack.refresh({
                onOutput: (output) => {
                    logger.debug(`Refresh output: ${output}`);
                },
            });
            if (refreshResult.summary?.result === "succeeded") {
                logger.info("Stack refresh completed successfully");
                stateRestored = true;
            }
            else {
                logger.warn("Stack refresh completed with warnings or errors");
            }
        }
        catch (stateError) {
            logger.warn("Could not fully restore previous state, proceeding with current configuration:", stateError);
            // Continue with rollback using current configuration
        }
        // Step 3: Execute rollback update operation
        onProgress("rolling-back", "Executing rollback update operation");
        logger.info("Executing rollback by running stack update to restore infrastructure state");
        // Track rollback attempts for retry logic
        let rollbackAttempts = 0;
        const maxRollbackAttempts = 2;
        let rollbackResult;
        while (rollbackAttempts < maxRollbackAttempts) {
            rollbackAttempts++;
            try {
                logger.info(`Rollback attempt ${rollbackAttempts}/${maxRollbackAttempts}`);
                // Set up rollback-specific options
                const rollbackOptions = {
                    onOutput: (output) => {
                        logger.debug(`Rollback output: ${output}`);
                    },
                    // Add targeted refresh to ensure we're working with current state
                    refresh: true,
                    // Set expectations for rollback operation
                    expectNoChanges: false,
                };
                // Perform the rollback by running an update
                // The Pulumi program should be idempotent, so running it again
                // with the refreshed state will restore to the desired configuration
                rollbackResult = await stack.up(rollbackOptions);
                // If we get here, the rollback succeeded
                break;
            }
            catch (rollbackAttemptError) {
                logger.warn(`Rollback attempt ${rollbackAttempts} failed:`, rollbackAttemptError);
                if (rollbackAttempts >= maxRollbackAttempts) {
                    // Final attempt failed, try to restore original config
                    logger.error("All rollback attempts failed, attempting to restore original configuration");
                    try {
                        // Restore the backed up configuration
                        for (const [key, value] of Object.entries(configBackup)) {
                            await stack.setConfig(key, value);
                        }
                        logger.info("Original configuration restored after failed rollback");
                    }
                    catch (restoreError) {
                        logger.error("Failed to restore original configuration:", restoreError);
                    }
                    throw new RollbackError(`All ${maxRollbackAttempts} rollback attempts failed: ${rollbackAttemptError instanceof Error
                        ? rollbackAttemptError.message
                        : String(rollbackAttemptError)}`, rollbackAttemptError instanceof Error
                        ? rollbackAttemptError
                        : new Error(String(rollbackAttemptError)));
                }
                // Wait before retry
                logger.info(`Waiting 5 seconds before retry...`);
                await new Promise((resolve) => setTimeout(resolve, 5000));
            }
        }
        // Step 4: Validate rollback results
        if (rollbackResult?.summary) {
            logger.info("--- Rollback Summary ---");
            logger.info(`Status: ${rollbackResult.summary.result}`);
            logger.info(`Version: ${rollbackResult.summary.version}`);
            logger.info(`Attempt: ${rollbackAttempts}/${maxRollbackAttempts}`);
            if (rollbackResult.summary.resourceChanges) {
                const changes = rollbackResult.summary.resourceChanges;
                const changeCount = Object.values(changes).reduce((sum, count) => sum + (count || 0), 0);
                logger.info(`Resources modified during rollback: ${changeCount}`);
                logger.debug("Resource changes during rollback:", JSON.stringify(changes, null, 2));
                // Log detailed change summary
                for (const [changeType, count] of Object.entries(changes)) {
                    if (count && count > 0) {
                        logger.info(`  ${changeType}: ${count} resources`);
                    }
                }
            }
            // Verify rollback success
            if (rollbackResult.summary.result === "succeeded") {
                onProgress("rolling-back", `Successfully rolled back to previous state (attempt ${rollbackAttempts})`, {
                    targetVersion: lastSuccessful.version,
                    newVersion: rollbackResult.summary.version,
                    resourceChanges: rollbackResult.summary.resourceChanges,
                    attempts: rollbackAttempts,
                    stateRestored,
                });
                logger.info(`Rollback completed successfully. New version: ${rollbackResult.summary.version}`);
                // Step 5: Post-rollback validation
                onProgress("rolling-back", "Performing post-rollback validation");
                logger.info("Performing post-rollback validation checks");
                try {
                    // Get and validate outputs
                    const outputs = await stack.outputs();
                    logger.debug("Post-rollback outputs:", JSON.stringify(outputs, null, 2));
                    // Check for critical outputs that should be available
                    const criticalOutputs = ["kubeconfig"];
                    const missingOutputs = criticalOutputs.filter((output) => !outputs[output]);
                    if (missingOutputs.length > 0) {
                        logger.warn(`Warning: Missing critical outputs after rollback: ${missingOutputs.join(", ")}`);
                    }
                    else {
                        logger.info("All critical outputs are available after rollback");
                    }
                }
                catch (validationError) {
                    logger.warn("Post-rollback validation encountered issues:", validationError);
                    // Don't fail the rollback for validation issues
                }
            }
            else {
                throw new RollbackError(`Rollback completed but with unexpected status: ${rollbackResult.summary.result}`, new Error(`Unexpected rollback status: ${rollbackResult.summary.result}`));
            }
        }
        else {
            logger.warn("Rollback completed but no summary information available");
            onProgress("rolling-back", "Rollback completed with limited status information", {
                targetVersion: lastSuccessful.version,
                attempts: rollbackAttempts,
            });
        }
    }
    catch (error) {
        const rollbackError = new RollbackError(`Rollback failed: ${error instanceof Error ? error.message : String(error)}`, error instanceof Error ? error : new Error(String(error)));
        logger.error("Rollback failed:", rollbackError.message);
        throw rollbackError;
    }
}
export class ConfigurationSnapshotManager {
    constructor(logger, maxSnapshots = 10) {
        this.logger = logger;
        this.snapshots = new Map();
        this.maxSnapshots = 10; // Keep last 10 snapshots per stack
        this.maxSnapshots = maxSnapshots;
    }
    /**
     * Store a configuration snapshot after a successful deployment
     */
    async storeSnapshot(stack, version, outputs, metadata) {
        try {
            const config = await stack.getAllConfig();
            const snapshot = {
                version,
                timestamp: new Date(),
                stackName: stack.name,
                config,
                outputs,
                metadata,
            };
            const stackSnapshots = this.snapshots.get(stack.name) || [];
            stackSnapshots.push(snapshot);
            // Keep only the most recent snapshots
            if (stackSnapshots.length > this.maxSnapshots) {
                stackSnapshots.splice(0, stackSnapshots.length - this.maxSnapshots);
            }
            this.snapshots.set(stack.name, stackSnapshots);
            this.logger.debug(`Configuration snapshot stored for ${stack.name} version ${version}`);
        }
        catch (error) {
            this.logger.warn(`Failed to store configuration snapshot: ${error}`);
        }
    }
    /**
     * Retrieve the most recent successful configuration snapshot
     */
    getLatestSnapshot(stackName) {
        const stackSnapshots = this.snapshots.get(stackName);
        return stackSnapshots && stackSnapshots.length > 0
            ? stackSnapshots[stackSnapshots.length - 1]
            : undefined;
    }
    /**
     * Retrieve a specific configuration snapshot by version
     */
    getSnapshotByVersion(stackName, version) {
        const stackSnapshots = this.snapshots.get(stackName);
        return stackSnapshots?.find((s) => s.version === version);
    }
    /**
     * Get all snapshots for a stack (most recent first)
     */
    getAllSnapshots(stackName) {
        const stackSnapshots = this.snapshots.get(stackName) || [];
        return [...stackSnapshots].reverse(); // Return most recent first
    }
    /**
     * Restore configuration from a snapshot
     */
    async restoreFromSnapshot(stack, snapshot) {
        try {
            this.logger.info(`Restoring configuration from snapshot version ${snapshot.version}`);
            // Clear current configuration and apply snapshot config
            for (const [key, value] of Object.entries(snapshot.config)) {
                await stack.setConfig(key, value);
            }
            this.logger.info(`Configuration restored from snapshot version ${snapshot.version}`);
            return true;
        }
        catch (error) {
            this.logger.error(`Failed to restore configuration from snapshot: ${error}`);
            return false;
        }
    }
    /**
     * Clean up old snapshots beyond the retention limit
     */
    cleanupOldSnapshots(stackName) {
        const stackSnapshots = this.snapshots.get(stackName);
        if (stackSnapshots && stackSnapshots.length > this.maxSnapshots) {
            const retained = stackSnapshots.slice(-this.maxSnapshots);
            this.snapshots.set(stackName, retained);
            this.logger.debug(`Cleaned up old snapshots for ${stackName}, retained ${retained.length}`);
        }
    }
}
// Global snapshot manager instance
let globalSnapshotManager;
export function getSnapshotManager(logger) {
    if (!globalSnapshotManager) {
        globalSnapshotManager = new ConfigurationSnapshotManager(logger);
    }
    return globalSnapshotManager;
}
// =============================================================================
// Enhanced Rollback with Snapshot Support
// =============================================================================
export async function performEnhancedRollback(stack, logger, onProgress, targetVersion) {
    const snapshotManager = getSnapshotManager(logger);
    try {
        onProgress("rolling-back", "Starting enhanced rollback operation");
        logger.info("Attempting enhanced rollback with configuration snapshot support");
        // Get stack history to find rollback target
        const history = await stack.history(10);
        let rollbackTarget;
        if (targetVersion) {
            // Find specific version in history
            rollbackTarget = history.find((update) => update.version === targetVersion);
            if (!rollbackTarget) {
                throw new RollbackError(`Specified target version ${targetVersion} not found in stack history`, new Error("Target version not found"));
            }
        }
        else {
            // Find last successful deployment
            rollbackTarget = history.find((update) => update.result === "succeeded" && update.kind === "update");
            if (!rollbackTarget) {
                throw new RollbackError("No previous successful deployment found for rollback", new Error("No rollback target available"));
            }
        }
        onProgress("rolling-back", `Found rollback target: version ${rollbackTarget.version}`);
        logger.info(`Rolling back to version ${rollbackTarget.version}`);
        // Try to restore from snapshot first
        const snapshot = snapshotManager.getSnapshotByVersion(stack.name, rollbackTarget.version);
        let configRestored = false;
        if (snapshot) {
            onProgress("rolling-back", "Restoring configuration from snapshot");
            logger.info("Found configuration snapshot, attempting to restore");
            configRestored = await snapshotManager.restoreFromSnapshot(stack, snapshot);
            if (configRestored) {
                logger.info("Configuration successfully restored from snapshot");
            }
            else {
                logger.warn("Failed to restore from snapshot, falling back to standard rollback");
            }
        }
        else {
            logger.info("No configuration snapshot found, using standard rollback approach");
        }
        // Perform the rollback operation
        onProgress("rolling-back", "Executing rollback update");
        logger.info("Executing rollback update operation");
        const rollbackResult = await stack.up({
            onOutput: (output) => {
                logger.debug(`Rollback output: ${output}`);
            },
            refresh: true,
        });
        // Validate rollback success
        if (rollbackResult.summary?.result === "succeeded") {
            onProgress("rolling-back", `Successfully rolled back to version ${rollbackTarget.version}`, {
                targetVersion: rollbackTarget.version,
                newVersion: rollbackResult.summary.version,
                configRestored,
                resourceChanges: rollbackResult.summary.resourceChanges,
            });
            // Store new snapshot after successful rollback
            const outputs = await stack.outputs();
            await snapshotManager.storeSnapshot(stack, rollbackResult.summary.version, outputs, { rollbackFrom: rollbackTarget.version });
            logger.info(`Enhanced rollback completed successfully. New version: ${rollbackResult.summary.version}`);
        }
        else {
            throw new RollbackError(`Rollback completed but with unexpected status: ${rollbackResult.summary?.result}`, new Error(`Unexpected rollback status`));
        }
    }
    catch (error) {
        const rollbackError = new RollbackError(`Enhanced rollback failed: ${error instanceof Error ? error.message : String(error)}`, error instanceof Error ? error : new Error(String(error)));
        logger.error("Enhanced rollback failed:", rollbackError.message);
        throw rollbackError;
    }
}
// =============================================================================
// Integration Helper for Snapshot Management
// =============================================================================
/**
 * Store a snapshot after a successful deployment
 * This should be called after successful 'up' operations
 */
export async function storeDeploymentSnapshot(stack, logger, result, metadata) {
    if (result.summary?.result === "succeeded") {
        const snapshotManager = getSnapshotManager(logger);
        const outputs = await stack.outputs();
        await snapshotManager.storeSnapshot(stack, result.summary.version, outputs, {
            deploymentTime: new Date(),
            resourceChanges: result.summary.resourceChanges,
            ...metadata,
        });
        logger.debug(`Configuration snapshot stored for successful deployment version ${result.summary.version}`);
    }
}
/**
 * List available rollback targets for a stack
 */
export async function listRollbackTargets(stack, logger) {
    try {
        const history = await stack.history(10);
        const rollbackTargets = history
            .filter((update) => update.result === "succeeded" && update.kind === "update")
            .map((update) => ({
            version: update.version,
            timestamp: update.startTime,
            result: update.result,
            kind: update.kind,
        }));
        logger.debug(`Found ${rollbackTargets.length} potential rollback targets`);
        return rollbackTargets;
    }
    catch (error) {
        logger.error(`Failed to list rollback targets: ${error}`);
        return [];
    }
}
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