79 lines
2.3 KiB
JavaScript
79 lines
2.3 KiB
JavaScript
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function filterError (input) {
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return {
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errorType: input.name,
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message: input.message,
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stack: input.stack,
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...(input.code ? { code: input.code } : {}),
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...(input.statusCode ? { statusCode: input.statusCode } : {}),
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}
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}
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const deepMap = (input, handler = v => v, path = ['$'], seen = new Set([input])) => {
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// this is in an effort to maintain bole's error logging behavior
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if (path.join('.') === '$' && input instanceof Error) {
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return deepMap({ err: filterError(input) }, handler, path, seen)
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}
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if (input instanceof Error) {
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return deepMap(filterError(input), handler, path, seen)
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}
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if (input instanceof Buffer) {
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return `[unable to log instanceof buffer]`
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}
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if (input instanceof Uint8Array) {
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return `[unable to log instanceof Uint8Array]`
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}
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if (Array.isArray(input)) {
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const result = []
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for (let i = 0; i < input.length; i++) {
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const element = input[i]
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const elementPath = [...path, i]
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if (element instanceof Object) {
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if (!seen.has(element)) { // avoid getting stuck in circular reference
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seen.add(element)
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result.push(deepMap(handler(element, elementPath), handler, elementPath, seen))
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}
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} else {
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result.push(handler(element, elementPath))
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}
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}
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return result
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}
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if (input === null) {
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return null
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} else if (typeof input === 'object' || typeof input === 'function') {
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const result = {}
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for (const propertyName of Object.getOwnPropertyNames(input)) {
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// skip logging internal properties
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if (propertyName.startsWith('_')) {
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continue
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}
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try {
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const property = input[propertyName]
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const propertyPath = [...path, propertyName]
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if (property instanceof Object) {
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if (!seen.has(property)) { // avoid getting stuck in circular reference
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seen.add(property)
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result[propertyName] = deepMap(
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handler(property, propertyPath), handler, propertyPath, seen
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)
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}
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} else {
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result[propertyName] = handler(property, propertyPath)
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}
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} catch (err) {
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// a getter may throw an error
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result[propertyName] = `[error getting value: ${err.message}]`
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}
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}
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return result
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}
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return handler(input, path)
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}
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module.exports = { deepMap }
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