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Add Twitter API rate limiting

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This commit is contained in:
Maurice Parker 2020-05-07 02:10:54 -05:00
parent 44476c5d6d
commit 2324d652cd
1 changed files with 20 additions and 2 deletions
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22
Frameworks/Account/FeedProvider/Twitter/TwitterFeedProvider.swift
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@ -13,11 +13,14 @@ import RSParser
import RSWeb
public enum TwitterFeedProviderError: LocalizedError {
case rateLimitExceeded
case screenNameNotFound
case unknown
public var localizedDescription: String {
switch self {
case .rateLimitExceeded:
return NSLocalizedString("Twitter API rate limit has been exceeded. Please wait a short time and try again.", comment: "Rate Limit")
case .screenNameNotFound:
return NSLocalizedString("Unable to determine screen name.", comment: "Screen name")
case .unknown:
@ -33,7 +36,7 @@ public enum TwitterFeedType: Int {
case search = 3
}
public struct TwitterFeedProvider: FeedProvider {
public final class TwitterFeedProvider: FeedProvider {
private static let homeURL = "https://www.twitter.com"
private static let server = "api.twitter.com"
@ -51,6 +54,9 @@ public struct TwitterFeedProvider: FeedProvider {
private var client: OAuthSwiftClient
private var rateLimitRemaining: Int?
private var rateLimitReset: Date?
public init?(tokenSuccess: OAuthSwift.TokenSuccess) {
guard let screenName = tokenSuccess.parameters["screen_name"] as? String else {
return nil
@ -332,6 +338,11 @@ private extension TwitterFeedProvider {
var expandedParameters = parameters
expandedParameters["tweet_mode"] = "extended"
if let remaining = rateLimitRemaining, let reset = rateLimitReset, remaining < 1 && reset > Date() {
completion(.failure(TwitterFeedProviderError.rateLimitExceeded))
return
}
client.get(url, parameters: expandedParameters, headers: Self.userAgentHeaders) { result in
switch result {
case .success(let response):
@ -340,7 +351,14 @@ private extension TwitterFeedProvider {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = Self.dateFormat
decoder.dateDecodingStrategy = .formatted(dateFormatter)
if let remaining = response.response.value(forHTTPHeaderField: "x-rate-limit-remaining") {
self.rateLimitRemaining = Int(remaining) ?? 0
}
if let reset = response.response.value(forHTTPHeaderField: "x-rate-limit-reset") {
self.rateLimitReset = Date(timeIntervalSince1970: Double(reset) ?? 0)
}
do {
let tweets: [TwitterStatus]
if isSearch {