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Allow transforming response body before being replayed #2

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Merged
dterzic merged 1 commit into from
Dec 7, 2022
Merged

Allow transforming response body before being replayed #2

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13 changes: 10 additions & 3 deletions Sources/LaserDisc/ReplayingRequestHandler.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -2,13 +2,15 @@ import Foundation
import Embassy

public typealias RequestMatcher = (_ entry: Entry, _ incomingRequest: URLRequest) -> Bool
public typealias ResponseTransformer = (_ incomingRequest: URLRequest, _ data: Data?) -> Data?

final class ReplayingRequestHandler: RequestHandler {
private let eventLoop: EventLoop
private let baseURL: URL
private let recordingPath: String
private let unrecordedRequestHandler: ((URLRequest) -> Void)?
private let matcher: RequestMatcher
private let transformer: ResponseTransformer?
private let fileManager = FileManager()

private lazy var recording: Recording = {
Expand All @@ -19,12 +21,14 @@ final class ReplayingRequestHandler: RequestHandler {
baseURL: URL,
recordingPath: String,
unrecordedRequestHandler: ((URLRequest) -> Void)? = nil,
matcher: RequestMatcher?) {
matcher: RequestMatcher?,
transformer: ResponseTransformer?) {
self.eventLoop = eventLoop
self.baseURL = baseURL
self.recordingPath = recordingPath
self.unrecordedRequestHandler = unrecordedRequestHandler
self.matcher = matcher ?? Self.approximateMatcher
self.transformer = transformer
}

func handle(request: URLRequest, sendStatus: @escaping StatusHandler, sendBody: @escaping BodyHandler) {
Expand All @@ -38,12 +42,15 @@ final class ReplayingRequestHandler: RequestHandler {
}

let textEncoding = String.Encoding(rawValue: response.bodyEncodingRaw)
let data = response.body.data(using: textEncoding)
var data = response.body.data(using: textEncoding)
if let transformer {
data = transformer(request, data)
}
response.headers["Content-Length"] = "\(data?.count ?? 0)"

eventLoop.call(withDelay: response.elapsedTime) {
sendStatus(response.status, response.headers)
if let data = response.body.data(using: .utf8) {
if let data {
sendBody(data)
sendBody(Data())
} else {
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6 changes: 4 additions & 2 deletions Sources/LaserDisc/Server.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -21,12 +21,14 @@ public final class Server {
public init(baseURL: URL,
recordingPath: String,
unrecordedRequestHandler: ((URLRequest) -> Void)? = nil,
requestMatcher: RequestMatcher? = nil) {
requestMatcher: RequestMatcher? = nil,
contentTransformer: ResponseTransformer? = nil) {
replayingRequestHandler = ReplayingRequestHandler(eventLoop: loop,
baseURL: baseURL,
recordingPath: recordingPath,
unrecordedRequestHandler: unrecordedRequestHandler,
matcher: requestMatcher)
matcher: requestMatcher,
transformer: contentTransformer)
recordingRequestHandler = RecordingRequestHandler(eventLoop: loop, baseURL: baseURL, recordingPath: recordingPath)
}

Expand Down