generateCacheKey method

String generateCacheKey(Request request)

Generates a deterministic cache key for a request.

The key is a SHA-256 hash of:

• Operation name
• Query document string
• JSON-encoded variables

This ensures that identical queries with identical variables produce the same cache key.

Implementation

String generateCacheKey(Request request) {
  final operation = request.operation;
  final queryString = operation.document.toString();
  final variables = request.variables;
  final operationName = operation.operationName ?? '';

  // Create deterministic string representation
  final keyComponents = [
    operationName,
    queryString,
    jsonEncode(variables),
  ];

  // Generate SHA-256 hash for compact, collision-resistant key
  return sha256.convert(utf8.encode(keyComponents.join('|'))).toString();
}