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// HTTP Trigger Function
exports.httpHandler = async (req, res) => {
  try {
    // Enable CORS
    res.set('Access-Control-Allow-Origin', '*');
    res.set('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');

    if (req.method === 'OPTIONS') {
      res.status(204).send('');
      return;
    }

    // Parse request
    const { name } = req.query;

    if (!name) {
      return res.status(400).json({ error: 'Name is required' });
    }

    // Log with Cloud Logging
    console.log(JSON.stringify({
      severity: 'INFO',
      message: 'Processing request',
      name: name,
      requestId: req.id
    }));

    // Business logic
    const response = {
      message: `Hello ${name}!`,
      timestamp: new Date().toISOString()
    };

    res.status(200).json(response);
  } catch (error) {
    console.error(JSON.stringify({
      severity: 'ERROR',
      message: error.message,
      stack: error.stack
    }));

    res.status(500).json({ error: 'Internal server error' });
  }
};

// Pub/Sub Trigger Function
exports.pubsubHandler = async (message, context) => {
  try {
    // Decode Pub/Sub message
    const pubsubMessage = message.data
      ? Buffer.from(message.data, 'base64').toString()
      : null;

    console.log('Received message:', pubsubMessage);

    // Parse message
    const data = JSON.parse(pubsubMessage);

    // Process message asynchronously
    await processMessage(data);

    console.log('Message processed successfully');
  } catch (error) {
    console.error('Error processing message:', error);
    throw error; // Function will retry
  }
};

// Cloud Storage Trigger Function
exports.storageHandler = async (file, context) => {
  try {
    const { name, bucket } = file;

    console.log(JSON.stringify({
      message: 'Processing storage event',
      bucket: bucket,
      file: name,
      eventId: context.eventId,
      eventType: context.eventType
    }));

    // Check file type
    if (!name.endsWith('.jpg') && !name.endsWith('.png')) {
      console.log('Skipping non-image file');
      return;
    }

    // Process image
    await processImage(bucket, name);

    console.log('Image processed successfully');
  } catch (error) {
    console.error('Error processing file:', error);
    throw error;
  }
};

// Cloud Scheduler (CRON) Function
exports.cronHandler = async (req, res) => {
  try {
    console.log('Scheduled job started');

    // Run batch processing
    await performBatchJob();

    res.status(200).json({ message: 'Batch job completed' });
  } catch (error) {
    console.error('Error in batch job:', error);
    res.status(500).json({ error: error.message });
  }
};

// Helper functions
async function processMessage(data) {
  // Business logic
  return new Promise(resolve => {
    setTimeout(() => resolve(), 1000);
  });
}

async function processImage(bucket, filename) {
  // Use Cloud Vision API or similar
  return true;
}

async function performBatchJob() {
  // Batch processing logic
  return true;
}

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environment_variables = {
  NODE_ENV = "production"
  API_KEY  = "your-api-key"
}

headers = {
  "Content-Type" = "application/json"
}

body = base64encode(jsonencode({
  job_type = "batch"
}))

oidc_token {
  service_account_email = google_service_account.function_sa.email
}

condition_threshold {
  filter          = "metric.type=\"cloudfunctions.googleapis.com/function/error_count\" AND resource.type=\"cloud_function\""
  duration        = "60s"
  comparison      = "COMPARISON_GT"
  threshold_value = 10
  aggregations {
    alignment_period    = "60s"
    per_series_aligner  = "ALIGN_RATE"
  }
}

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