122 lines
3.5 KiB
Swift
122 lines
3.5 KiB
Swift
//
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// FeedlyGetStreamOperation.swift
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// Account
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//
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// Created by Kiel Gillard on 20/9/19.
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// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import RSParser
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import os.log
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protocol FeedlyEntryProviding {
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var entries: [FeedlyEntry] { get }
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}
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protocol FeedlyParsedItemProviding {
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var resource: FeedlyResourceId { get }
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var parsedEntries: Set<ParsedItem> { get }
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}
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protocol FeedlyGetStreamContentsOperationDelegate: class {
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func feedlyGetStreamContentsOperation(_ operation: FeedlyGetStreamContentsOperation, didGetContentsOf stream: FeedlyStream)
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}
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/// Single responsibility is to get the stream content of a Collection from Feedly.
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final class FeedlyGetStreamContentsOperation: FeedlyOperation, FeedlyEntryProviding, FeedlyParsedItemProviding {
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struct ResourceProvider: FeedlyResourceProviding {
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var resource: FeedlyResourceId
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}
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let resourceProvider: FeedlyResourceProviding
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var resource: FeedlyResourceId {
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return resourceProvider.resource
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}
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var entries: [FeedlyEntry] {
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guard let entries = stream?.items else {
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assert(isFinished, "This should only be called when the operation finishes without error.")
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assertionFailure("Has this operation been addeded as a dependency on the caller?")
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return []
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}
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return entries
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}
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var parsedEntries: Set<ParsedItem> {
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if let entries = storedParsedEntries {
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return entries
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}
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let parsed = Set(entries.compactMap {
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FeedlyEntryParser(entry: $0).parsedItemRepresentation
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})
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if parsed.count != entries.count {
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let entryIds = Set(entries.map { $0.id })
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let parsedIds = Set(parsed.map { $0.uniqueID })
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let difference = entryIds.subtracting(parsedIds)
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os_log(.debug, log: log, "Dropping articles with ids: %{public}@.", difference)
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}
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storedParsedEntries = parsed
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return parsed
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}
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private(set) var stream: FeedlyStream? {
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didSet {
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storedParsedEntries = nil
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}
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}
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private var storedParsedEntries: Set<ParsedItem>?
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let account: Account
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let service: FeedlyGetStreamContentsService
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let unreadOnly: Bool?
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let newerThan: Date?
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let continuation: String?
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let log: OSLog
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weak var streamDelegate: FeedlyGetStreamContentsOperationDelegate?
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init(account: Account, resource: FeedlyResourceId, service: FeedlyGetStreamContentsService, continuation: String? = nil, newerThan: Date?, unreadOnly: Bool? = nil, log: OSLog) {
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self.account = account
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self.resourceProvider = ResourceProvider(resource: resource)
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self.service = service
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self.continuation = continuation
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self.unreadOnly = unreadOnly
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self.newerThan = newerThan
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self.log = log
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}
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convenience init(account: Account, resourceProvider: FeedlyResourceProviding, service: FeedlyGetStreamContentsService, newerThan: Date?, unreadOnly: Bool? = nil, log: OSLog) {
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self.init(account: account, resource: resourceProvider.resource, service: service, newerThan: newerThan, unreadOnly: unreadOnly, log: log)
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}
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override func main() {
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guard !isCancelled else {
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didFinish()
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return
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}
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service.getStreamContents(for: resourceProvider.resource, continuation: continuation, newerThan: newerThan, unreadOnly: unreadOnly) { result in
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switch result {
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case .success(let stream):
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self.stream = stream
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self.streamDelegate?.feedlyGetStreamContentsOperation(self, didGetContentsOf: stream)
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self.didFinish()
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case .failure(let error):
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os_log(.debug, log: self.log, "Unable to get stream contents: %{public}@.", error as NSError)
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self.didFinish(error)
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}
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}
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}
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}
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