1. /**
  2. * Transforms metadata for diagnostics with defensive checks.
  3. *
  4. * @param {object} metadata - The input metadata object.
  5. * @returns {object} - The transformed metadata object. Returns null if input is invalid.
  6. */
  7. function transformMetadata(metadata) {
  8. // Defensive check: Ensure input is an object
  9. if (typeof metadata !== 'object' || metadata === null) {
  10. console.error("Invalid input: Metadata must be an object.");
  11. return null;
  12. }
  14. const transformed = {};
  16. // Defensive check: Ensure 'timestamp' exists and is a number
  17. if (metadata.timestamp !== undefined && typeof metadata.timestamp === 'number') {
  18. transformed.timestamp = metadata.timestamp;
  19. } else {
  20. console.warn("Timestamp missing or invalid. Skipping.");
  21. }
  23. // Defensive check: Ensure 'level' exists and is one of the allowed values
  24. const allowedLevels = ['info', 'warn', 'error'];
  25. if (metadata.level !== undefined && allowedLevels.includes(metadata.level)) {
  26. transformed.level = metadata.level;
  27. } else {
  28. console.warn("Invalid level. Skipping.");
  29. }
  31. // Defensive check: Ensure 'message' exists and is a string
  32. if (metadata.message !== undefined && typeof metadata.message === 'string') {
  33. transformed.message = metadata.message;
  34. } else {
  35. console.warn("Message missing or invalid. Skipping.");
  36. }
  38. // Defensive check: Ensure 'source' exists and is a string
  39. if (metadata.source !== undefined && typeof metadata.source === 'string'){
  40. transformed.source = metadata.source;
  41. } else {
  42. console.warn("Source missing or invalid. Skipping.");
  43. }
  45. // Defensive check: Ensure 'data' is an object
  46. if (metadata.data !== undefined && typeof metadata.data === 'object' && metadata.data !== null) {
  47. transformed.data = metadata.data;
  48. } else {
  49. console.warn("Data missing or invalid. Skipping.");
  50. }
  52. return transformed;
  53. }

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