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Merge pull request #111 from interstateone/aria2
Add support for downloading with aria2 if it's already installed
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| import Foundation | ||
|
|
||
| /// A LocalizedError that represents a non-zero exit code from running aria2c. | ||
| struct Aria2CError: LocalizedError { | ||
| var code: Code | ||
|
|
||
| init?(exitStatus: Int32) { | ||
| guard let code = Code(rawValue: exitStatus) else { return nil } | ||
| self.code = code | ||
| } | ||
|
|
||
| var errorDescription: String? { | ||
| "aria2c error: \(code.description)" | ||
| } | ||
|
|
||
| // https://github.com/aria2/aria2/blob/master/src/error_code.h | ||
| enum Code: Int32, CustomStringConvertible { | ||
| case undefined = -1 | ||
| // Ignoring, not an error | ||
| // case finished = 0 | ||
| case unknownError = 1 | ||
| case timeOut | ||
| case resourceNotFound | ||
| case maxFileNotFound | ||
| case tooSlowDownloadSpeed | ||
| case networkProblem | ||
| case inProgress | ||
| case cannotResume | ||
| case notEnoughDiskSpace | ||
| case pieceLengthChanged | ||
| case duplicateDownload | ||
| case duplicateInfoHash | ||
| case fileAlreadyExists | ||
| case fileRenamingFailed | ||
| case fileOpenError | ||
| case fileCreateError | ||
| case fileIoError | ||
| case dirCreateError | ||
| case nameResolveError | ||
| case metalinkParseError | ||
| case ftpProtocolError | ||
| case httpProtocolError | ||
| case httpTooManyRedirects | ||
| case httpAuthFailed | ||
| case bencodeParseError | ||
| case bittorrentParseError | ||
| case magnetParseError | ||
| case optionError | ||
| case httpServiceUnavailable | ||
| case jsonParseError | ||
| case removed | ||
| case checksumError | ||
|
|
||
| var description: String { | ||
| switch self { | ||
| case .undefined: | ||
| return "Undefined" | ||
| case .unknownError: | ||
| return "Unknown error" | ||
| case .timeOut: | ||
| return "Timed out" | ||
| case .resourceNotFound: | ||
| return "Resource not found" | ||
| case .maxFileNotFound: | ||
| return "Maximum number of file not found errors reached" | ||
| case .tooSlowDownloadSpeed: | ||
| return "Download speed too slow" | ||
| case .networkProblem: | ||
| return "Network problem" | ||
| case .inProgress: | ||
| return "Unfinished downloads in progress" | ||
| case .cannotResume: | ||
| return "Remote server did not support resume when resume was required to complete download" | ||
| case .notEnoughDiskSpace: | ||
| return "Not enough disk space available" | ||
| case .pieceLengthChanged: | ||
| return "Piece length was different from one in .aria2 control file" | ||
| case .duplicateDownload: | ||
| return "Duplicate download" | ||
| case .duplicateInfoHash: | ||
| return "Duplicate info hash torrent" | ||
| case .fileAlreadyExists: | ||
| return "File already exists" | ||
| case .fileRenamingFailed: | ||
| return "Renaming file failed" | ||
| case .fileOpenError: | ||
| return "Could not open existing file" | ||
| case .fileCreateError: | ||
| return "Could not create new file or truncate existing file" | ||
| case .fileIoError: | ||
| return "File I/O error" | ||
| case .dirCreateError: | ||
| return "Could not create directory" | ||
| case .nameResolveError: | ||
| return "Name resolution failed" | ||
| case .metalinkParseError: | ||
| return "Could not parse Metalink document" | ||
| case .ftpProtocolError: | ||
| return "FTP command failed" | ||
| case .httpProtocolError: | ||
| return "HTTP response header was bad or unexpected" | ||
| case .httpTooManyRedirects: | ||
| return "Too many redirects occurred" | ||
| case .httpAuthFailed: | ||
| return "HTTP authorization failed" | ||
| case .bencodeParseError: | ||
| return "Could not parse bencoded file (usually \".torrent\" file)" | ||
| case .bittorrentParseError: | ||
| return "\".torrent\" file was corrupted or missing information" | ||
| case .magnetParseError: | ||
| return "Magnet URI was bad" | ||
| case .optionError: | ||
| return "Bad/unrecognized option was given or unexpected option argument was given" | ||
| case .httpServiceUnavailable: | ||
| return "HTTP service unavailable" | ||
| case .jsonParseError: | ||
| return "Could not parse JSON-RPC request" | ||
| case .removed: | ||
| return "Reserved. Not used." | ||
| case .checksumError: | ||
| return "Checksum validation failed" | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| import Foundation | ||
| import PromiseKit | ||
|
|
||
| /// Attempt and retry a task that fails with resume data up to `maximumRetryCount` times | ||
| func attemptResumableTask<T>( | ||
| maximumRetryCount: Int = 3, | ||
| delayBeforeRetry: DispatchTimeInterval = .seconds(2), | ||
| _ body: @escaping (Data?) -> Promise<T> | ||
| ) -> Promise<T> { | ||
| var attempts = 0 | ||
| func attempt(with resumeData: Data? = nil) -> Promise<T> { | ||
| attempts += 1 | ||
| return body(resumeData).recover { error -> Promise<T> in | ||
| guard | ||
| attempts < maximumRetryCount, | ||
| let resumeData = (error as NSError).userInfo[NSURLSessionDownloadTaskResumeData] as? Data | ||
| else { throw error } | ||
|
|
||
| return after(delayBeforeRetry).then(on: nil) { attempt(with: resumeData) } | ||
| } | ||
| } | ||
| return attempt() | ||
| } | ||
|
|
||
| /// Attempt and retry a task up to `maximumRetryCount` times | ||
| func attemptRetryableTask<T>( | ||
| maximumRetryCount: Int = 3, | ||
| delayBeforeRetry: DispatchTimeInterval = .seconds(2), | ||
| _ body: @escaping () -> Promise<T> | ||
| ) -> Promise<T> { | ||
| var attempts = 0 | ||
| func attempt() -> Promise<T> { | ||
| attempts += 1 | ||
| return body().recover { error -> Promise<T> in | ||
| guard attempts < maximumRetryCount else { throw error } | ||
| return after(delayBeforeRetry).then(on: nil) { attempt() } | ||
| } | ||
| } | ||
| return attempt() | ||
| } |
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