├── Demo
    ├── Demo
    │   ├── Assets.xcassets
    │   │   ├── Contents.json
    │   │   ├── AccentColor.colorset
    │   │   │   └── Contents.json
    │   │   └── AppIcon.appiconset
    │   │   │   └── Contents.json
    │   ├── Preview Content
    │   │   └── Preview Assets.xcassets
    │   │   │   └── Contents.json
    │   ├── DemoApp.swift
    │   ├── Info.plist
    │   └── ContentView.swift
    └── Demo.xcodeproj
    │   ├── project.xcworkspace
    │       ├── contents.xcworkspacedata
    │       └── xcshareddata
    │       │   └── IDEWorkspaceChecks.plist
    │   └── project.pbxproj
├── Sources
    └── OpenAIStreamingCompletions
    │   ├── OpenAI.swift
    │   ├── EventSource
    │       ├── Event.swift
    │       ├── EventStreamParser.swift
    │       └── EventSource.swift
    │   ├── OpenAI+TextCompletion.swift
    │   └── OpenAI+ChatCompletion.swift
├── Tests
    └── OpenAIStreamingCompletionsTests
    │   └── OpenAIStreamingCompletionsTests.swift
├── Package.swift
├── README.md
├── .gitignore
└── LICENSE


/Demo/Demo/Assets.xcassets/Contents.json:
--------------------------------------------------------------------------------
1 | {
2 |   "info" : {
3 |     "author" : "xcode",
4 |     "version" : 1
5 |   }
6 | }
7 | 


--------------------------------------------------------------------------------
/Demo/Demo/Preview Content/Preview Assets.xcassets/Contents.json:
--------------------------------------------------------------------------------
1 | {
2 |   "info" : {
3 |     "author" : "xcode",
4 |     "version" : 1
5 |   }
6 | }
7 | 


--------------------------------------------------------------------------------
/Demo/Demo.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/Demo/Demo/Assets.xcassets/AccentColor.colorset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "colors" : [
 3 |     {
 4 |       "idiom" : "universal"
 5 |     }
 6 |   ],
 7 |   "info" : {
 8 |     "author" : "xcode",
 9 |     "version" : 1
10 |   }
11 | }
12 | 


--------------------------------------------------------------------------------
/Demo/Demo/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "universal",
 5 |       "platform" : "ios",
 6 |       "size" : "1024x1024"
 7 |     }
 8 |   ],
 9 |   "info" : {
10 |     "author" : "xcode",
11 |     "version" : 1
12 |   }
13 | }
14 | 


--------------------------------------------------------------------------------
/Demo/Demo/DemoApp.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  DemoApp.swift
 3 | //  Demo
 4 | //
 5 | //  Created by nate parrott on 2/23/23.
 6 | //
 7 | 
 8 | import SwiftUI
 9 | 
10 | @main
11 | struct DemoApp: App {
12 |     var body: some Scene {
13 |         WindowGroup {
14 |             ContentView()
15 |         }
16 |     }
17 | }
18 | 


--------------------------------------------------------------------------------
/Demo/Demo.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
3 | <plist version="1.0">
4 | <dict>
5 | 	<key>IDEDidComputeMac32BitWarning</key>
6 | 	<true/>
7 | </dict>
8 | </plist>
9 | 


--------------------------------------------------------------------------------
/Demo/Demo/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>NSAppTransportSecurity</key>
 6 | 	<dict>
 7 | 		<key>NSAllowsArbitraryLoads</key>
 8 | 		<true/>
 9 | 	</dict>
10 | </dict>
11 | </plist>
12 | 


--------------------------------------------------------------------------------
/Sources/OpenAIStreamingCompletions/OpenAI.swift:
--------------------------------------------------------------------------------
 1 | import Foundation
 2 | 
 3 | public struct OpenAIAPI {
 4 |     var apiKey: String
 5 |     var orgId: String?
 6 | 
 7 |     public init(apiKey: String, orgId: String? = nil) {
 8 |         self.apiKey = apiKey
 9 |         self.orgId = orgId
10 |     }
11 | }
12 | 
13 | extension OpenAIAPI {
14 |     enum Errors: Error {
15 |         case noChoices
16 |         case invalidResponse(String)
17 |         case noApiKey
18 |     }
19 | }
20 | 
21 | 


--------------------------------------------------------------------------------
/Tests/OpenAIStreamingCompletionsTests/OpenAIStreamingCompletionsTests.swift:
--------------------------------------------------------------------------------
 1 | import XCTest
 2 | @testable import OpenAIStreamingCompletions
 3 | 
 4 | final class OpenAIStreamingCompletionsTests: XCTestCase {
 5 |     func testExample() throws {
 6 |         // This is an example of a functional test case.
 7 |         // Use XCTAssert and related functions to verify your tests produce the correct
 8 |         // results.
 9 |         XCTAssertEqual(OpenAIStreamingCompletions().text, "Hello, World!")
10 |     }
11 | }
12 | 


--------------------------------------------------------------------------------
/Package.swift:
--------------------------------------------------------------------------------
 1 | // swift-tools-version: 5.7
 2 | // The swift-tools-version declares the minimum version of Swift required to build this package.
 3 | 
 4 | import PackageDescription
 5 | 
 6 | let package = Package(
 7 |     name: "OpenAIStreamingCompletions",
 8 |     platforms: [
 9 |         .iOS(.v13),
10 |         .macOS(.v11),
11 |     ],
12 |     products: [
13 |         // Products define the executables and libraries a package produces, and make them visible to other packages.
14 |         .library(
15 |             name: "OpenAIStreamingCompletions",
16 |             targets: ["OpenAIStreamingCompletions"]),
17 |     ],
18 |     dependencies: [
19 |         // Dependencies declare other packages that this package depends on.
20 |         // .package(url: /* package url */, from: "1.0.0"),
21 |     ],
22 |     targets: [
23 |         // Targets are the basic building blocks of a package. A target can define a module or a test suite.
24 |         // Targets can depend on other targets in this package, and on products in packages this package depends on.
25 |         .target(
26 |             name: "OpenAIStreamingCompletions",
27 |             dependencies: []),
28 |         .testTarget(
29 |             name: "OpenAIStreamingCompletionsTests",
30 |             dependencies: ["OpenAIStreamingCompletions"]),
31 |     ]
32 | )
33 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # OpenAIStreamingCompletions
 2 | 
 3 | Streaming text generartion using the OpenAI APIs.
 4 | 
 5 | Supports streaming results via `ObservableObject` or `AsyncStream`, and non-streaming results via `async/await`.
 6 | 
 7 | Supports message-based models (e.g. ChatGPT) and text-based models (e.g. davinci).
 8 | 
 9 | ## Installation via Swift Package Manager
10 | 
11 | You can either:
12 | - Add this line to your `Package.swift` `dependencies` array: `.package(url: "https://github.com/nate-parrott/openai-streaming-completions-swift", from: "1.0.1")`
13 | - Use Xcode's `File -> Add Packages` and paste the URL to this repository
14 | 
15 | ## Calling ChatGPT
16 | 
17 | ### Provide API key and prompt
18 | 
19 | ```
20 | let messages: [OpenAIAPI.Message] = [
21 |     .init(role: .system, content: "You are a helpful assistant. Answer in one sentence if possible."),
22 |     .init(role: .user, content: prompt)
23 | ]
24 | let api = OpenAIAPI(apiKey: key)
25 | ```
26 | 
27 | ### Option A: Generate text (streaming, asyncStream)
28 | 
29 | ```
30 | Task {
31 |     let stream =  try api.completeChatStreaming(.init(messages:  promptMessages))
32 |     for await message in stream {
33 |         print("\(message.content)") // each message contains a small part of the response
34 |     }
35 | }
36 | 
37 | ```
38 | 
39 | 
40 | ### Option B: Generate text (non-streaming, async/await)
41 | 
42 | ```
43 | Task {
44 |     do {
45 |         self.completedText = try await api.completeChat(.init(messages: messages))
46 |     } catch {
47 |         print("Error: \(error)")
48 |     }
49 | }
50 | ```
51 | 
52 | ## Calling other text APIs
53 | 
54 | See [OpenAIAPI+TextCompletion.swift](https://github.com/nate-parrott/openai-streaming-completions-swift/blob/main/Sources/OpenAIStreamingCompletions/OpenAI%2BTextCompletion.swift)


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
 1 | # Xcode
 2 | #
 3 | # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
 4 | 
 5 | ## User settings
 6 | xcuserdata/
 7 | 
 8 | *.DS_Store
 9 | 
10 | ## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
11 | *.xcscmblueprint
12 | *.xccheckout
13 | 
14 | ## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
15 | build/
16 | DerivedData/
17 | *.moved-aside
18 | *.pbxuser
19 | !default.pbxuser
20 | *.mode1v3
21 | !default.mode1v3
22 | *.mode2v3
23 | !default.mode2v3
24 | *.perspectivev3
25 | !default.perspectivev3
26 | 
27 | ## Obj-C/Swift specific
28 | *.hmap
29 | 
30 | ## App packaging
31 | *.ipa
32 | *.dSYM.zip
33 | *.dSYM
34 | 
35 | ## Playgrounds
36 | timeline.xctimeline
37 | playground.xcworkspace
38 | 
39 | # Swift Package Manager
40 | #
41 | # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
42 | # Packages/
43 | # Package.pins
44 | # Package.resolved
45 | # *.xcodeproj
46 | #
47 | # Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
48 | # hence it is not needed unless you have added a package configuration file to your project
49 | # .swiftpm
50 | 
51 | .build/
52 | 
53 | # CocoaPods
54 | #
55 | # We recommend against adding the Pods directory to your .gitignore. However
56 | # you should judge for yourself, the pros and cons are mentioned at:
57 | # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
58 | #
59 | # Pods/
60 | #
61 | # Add this line if you want to avoid checking in source code from the Xcode workspace
62 | # *.xcworkspace
63 | 
64 | # Carthage
65 | #
66 | # Add this line if you want to avoid checking in source code from Carthage dependencies.
67 | # Carthage/Checkouts
68 | 
69 | Carthage/Build/
70 | 
71 | # Accio dependency management
72 | Dependencies/
73 | .accio/
74 | 
75 | # fastlane
76 | #
77 | # It is recommended to not store the screenshots in the git repo.
78 | # Instead, use fastlane to re-generate the screenshots whenever they are needed.
79 | # For more information about the recommended setup visit:
80 | # https://docs.fastlane.tools/best-practices/source-control/#source-control
81 | 
82 | fastlane/report.xml
83 | fastlane/Preview.html
84 | fastlane/screenshots/**/*.png
85 | fastlane/test_output
86 | 
87 | # Code Injection
88 | #
89 | # After new code Injection tools there's a generated folder /iOSInjectionProject
90 | # https://github.com/johnno1962/injectionforxcode
91 | 
92 | iOSInjectionProject/
93 | 


--------------------------------------------------------------------------------
/Demo/Demo/ContentView.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ContentView.swift
 3 | //  Demo
 4 | //
 5 | //  Created by nate parrott on 2/23/23.
 6 | //
 7 | 
 8 | import SwiftUI
 9 | import OpenAIStreamingCompletions
10 | 
11 | struct ContentView: View {
12 |     @State private var prompt = "what is internet explorer"
13 |     @State private var completion: StreamingCompletion?
14 |     @State private var completedText: String = ""
15 |     @AppStorage("key") private var key = ""
16 | 
17 |     var body: some View {
18 |         Form {
19 |             Section {
20 |                 TextField("API key", text: $key)
21 |                 TextField("Prompt to complete", text: $prompt, onCommit: complete)
22 |                 Button("Complete Text", action: complete)
23 |                 Button("Complete Chat", action: completeChat)
24 |             }
25 |             if let completion {
26 |                 Section {
27 |                     CompletionView(completion: completion)
28 |                 }
29 |             }
30 |             if completedText != "" {
31 |                 Section {
32 |                     Text(completedText)
33 |                 }
34 |             }
35 |         }
36 |     }
37 | 
38 |     private func complete() {
39 |         if key == "" { return }
40 |         self.completion = try! OpenAIAPI(apiKey: key).completeStreaming(.init(prompt: prompt, max_tokens: 256))
41 |     }
42 | 
43 |     private func completeChat() {
44 |         if key == "" { return }
45 |         let messages: [OpenAIAPI.Message] = [
46 |             .init(role: .system, content: "You are a helpful assistant. Answer in one sentence if possible."),
47 |             .init(role: .user, content: prompt)
48 |         ]
49 | //        Task {
50 | //            do {
51 | //                self.completedText = try await OpenAIAPI(apiKey: key).completeChat(.init(messages: messages))
52 | //            } catch {
53 | //                self.completedText = "Error: \(error)"
54 | //            }
55 | //        }
56 |         self.completion = try! OpenAIAPI(apiKey: key).completeChatStreamingWithObservableObject(.init(messages: messages))
57 |     }
58 | }
59 | 
60 | private struct CompletionView: View {
61 |     @ObservedObject var completion: StreamingCompletion
62 | 
63 |     var body: some View {
64 |         Group {
65 |             Text("\(completion.text)")
66 |                 .multilineTextAlignment(.leading)
67 |                 .lineLimit(nil)
68 |         }
69 |         switch completion.status {
70 |         case .error: Text("Errror")
71 |         case .complete: Text("Complete")
72 |         case .loading: Text("Loading")
73 |         }
74 |     }
75 | }
76 | 
77 | struct ContentView_Previews: PreviewProvider {
78 |     static var previews: some View {
79 |         ContentView()
80 |     }
81 | }
82 | 


--------------------------------------------------------------------------------
/Sources/OpenAIStreamingCompletions/EventSource/Event.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  Event.swift
  3 | //  EventSource
  4 | //
  5 | //  Created by Andres on 01/06/2019.
  6 | //  Copyright © 2019 inaka. All rights reserved.
  7 | //
  8 | 
  9 | import Foundation
 10 | 
 11 | enum Event {
 12 |     case event(id: String?, event: String?, data: String?, time: String?)
 13 | 
 14 |     init?(eventString: String?, newLineCharacters: [String]) {
 15 |         guard let eventString = eventString else { return nil }
 16 | 
 17 |         if eventString.hasPrefix(":") {
 18 |             return nil
 19 |         }
 20 | 
 21 |         self = Event.parseEvent(eventString, newLineCharacters: newLineCharacters)
 22 |     }
 23 | 
 24 |     var id: String? {
 25 |         guard case let .event(eventId, _, _, _) = self else { return nil }
 26 |         return eventId
 27 |     }
 28 | 
 29 |     var event: String? {
 30 |         guard case let .event(_, eventName, _, _) = self else { return nil }
 31 |         return eventName
 32 |     }
 33 | 
 34 |     var data: String? {
 35 |         guard case let .event(_, _, eventData, _) = self else { return nil }
 36 |         return eventData
 37 |     }
 38 | 
 39 |     var retryTime: Int? {
 40 |         guard case let .event(_, _, _, aTime) = self, let time = aTime else { return nil }
 41 |         return Int(time.trimmingCharacters(in: CharacterSet.whitespaces))
 42 |     }
 43 | 
 44 |     var onlyRetryEvent: Bool? {
 45 |         guard case let .event(id, name, data, time) = self else { return nil }
 46 |         let otherThanTime = id ?? name ?? data
 47 | 
 48 |         if otherThanTime == nil && time != nil {
 49 |             return true
 50 |         }
 51 | 
 52 |         return false
 53 | 
 54 |     }
 55 | }
 56 | 
 57 | private extension Event {
 58 | 
 59 |     static func parseEvent(_ eventString: String, newLineCharacters: [String]) -> Event {
 60 |         var event: [String: String?] = [:]
 61 | 
 62 |         for line in eventString.components(separatedBy: CharacterSet.newlines) as [String] {
 63 |             let (akey, value) = Event.parseLine(line, newLineCharacters: newLineCharacters)
 64 |             guard let key = akey else { continue }
 65 | 
 66 |             if let value = value, let previousValue = event[key] ?? nil {
 67 |                 event[key] = "\(previousValue)\n\(value)"
 68 |             } else if let value = value {
 69 |                 event[key] = value
 70 |             } else {
 71 |                 event[key] = nil
 72 |             }
 73 |         }
 74 | 
 75 |         // the only possible field names for events are: id, event and data. Everything else is ignored.
 76 |         return .event(
 77 |             id: event["id"] ?? nil,
 78 |             event: event["event"] ?? nil,
 79 |             data: event["data"] ?? nil,
 80 |             time: event["retry"] ?? nil
 81 |         )
 82 |     }
 83 | 
 84 |     static func parseLine(_ line: String, newLineCharacters: [String]) -> (key: String?, value: String?) {
 85 |         var key: NSString?, value: NSString?
 86 |         let scanner = Scanner(string: line)
 87 |         scanner.scanUpTo(":", into: &key)
 88 |         scanner.scanString(":", into: nil)
 89 | 
 90 |         for newline in newLineCharacters {
 91 |             if scanner.scanUpTo(newline, into: &value) {
 92 |                 break
 93 |             }
 94 |         }
 95 | 
 96 |         // for id and data if they come empty they should return an empty string value.
 97 |         if key != "event" && value == nil {
 98 |             value = ""
 99 |         }
100 | 
101 |         return (key as String?, value as String?)
102 |     }
103 | }
104 | 


--------------------------------------------------------------------------------
/Sources/OpenAIStreamingCompletions/EventSource/EventStreamParser.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  EventStreamParser.swift
 3 | //  EventSource
 4 | //
 5 | //  Created by Andres on 30/05/2019.
 6 | //  Copyright © 2019 inaka. All rights reserved.
 7 | //
 8 | 
 9 | import Foundation
10 | 
11 | final class EventStreamParser {
12 | 
13 |     //  Events are separated by end of line. End of line can be:
14 |     //  \r = CR (Carriage Return) → Used as a new line character in Mac OS before X
15 |     //  \n = LF (Line Feed) → Used as a new line character in Unix/Mac OS X
16 |     //  \r\n = CR + LF → Used as a new line character in Windows
17 |     private let validNewlineCharacters = ["\r\n", "\n", "\r"]
18 |     private let dataBuffer: NSMutableData
19 | 
20 |     init() {
21 |         dataBuffer = NSMutableData()
22 |     }
23 | 
24 |     var currentBuffer: String? {
25 |         return NSString(data: dataBuffer as Data, encoding: String.Encoding.utf8.rawValue) as String?
26 |     }
27 | 
28 |     func append(data: Data?) -> [Event] {
29 |         guard let data = data else { return [] }
30 |         dataBuffer.append(data)
31 | 
32 |         let events = extractEventsFromBuffer().compactMap { [weak self] eventString -> Event? in
33 |             guard let self = self else { return nil }
34 |             return Event(eventString: eventString, newLineCharacters: self.validNewlineCharacters)
35 |         }
36 | 
37 |         return events
38 |     }
39 | 
40 |     private func extractEventsFromBuffer() -> [String] {
41 |         var events = [String]()
42 | 
43 |         var searchRange =  NSRange(location: 0, length: dataBuffer.length)
44 |         while let foundRange = searchFirstEventDelimiter(in: searchRange) {
45 |             // if we found a delimiter range that means that from the beggining of the buffer
46 |             // until the beggining of the range where the delimiter was found we have an event.
47 |             // The beggining of the event is: searchRange.location
48 |             // The lenght of the event is the position where the foundRange was found.
49 | 
50 |             let dataChunk = dataBuffer.subdata(
51 |                 with: NSRange(location: searchRange.location, length: foundRange.location - searchRange.location)
52 |             )
53 | 
54 |             if let text = String(bytes: dataChunk, encoding: .utf8) {
55 |                 events.append(text)
56 |             }
57 | 
58 |             // We move the searchRange start position (location) after the fundRange we just found and
59 |             searchRange.location = foundRange.location + foundRange.length
60 |             searchRange.length = dataBuffer.length - searchRange.location
61 |         }
62 | 
63 |         // We empty the piece of the buffer we just search in.
64 |         dataBuffer.replaceBytes(in: NSRange(location: 0, length: searchRange.location), withBytes: nil, length: 0)
65 | 
66 |         return events
67 |     }
68 | 
69 |     // This methods returns the range of the first delimiter found in the buffer. For example:
70 |     // If in the buffer we have: `id: event-id-1\ndata:event-data-first\n\n`
71 |     // This method will return the range for the `\n\n`.
72 |     private func searchFirstEventDelimiter(in range: NSRange) -> NSRange? {
73 |         let delimiters = validNewlineCharacters.map { "\($0)\($0)".data(using: String.Encoding.utf8)! }
74 | 
75 |         for delimiter in delimiters {
76 |             let foundRange = dataBuffer.range(
77 |                 of: delimiter, options: NSData.SearchOptions(), in: range
78 |             )
79 | 
80 |             if foundRange.location != NSNotFound {
81 |                 return foundRange
82 |             }
83 |         }
84 | 
85 |         return nil
86 |     }
87 | }
88 | 


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/Sources/OpenAIStreamingCompletions/OpenAI+TextCompletion.swift:
--------------------------------------------------------------------------------
  1 | import Foundation
  2 | import Combine
  3 | 
  4 | extension OpenAIAPI {
  5 |     public struct CompletionRequest: Codable {
  6 |         var prompt: String
  7 |         var model = "text-davinci-003"
  8 |         var max_tokens: Int = 1500
  9 |         var temperature: Double = 0.2
 10 |         var stream = false
 11 |         var stop: [String]?
 12 | 
 13 |         public init(prompt: String, model: String = "text-davinci-003", max_tokens: Int = 1500, temperature: Double = 0.2, stop: [String]? = nil) {
 14 |             self.prompt = prompt
 15 |             self.model = model
 16 |             self.max_tokens = max_tokens
 17 |             self.temperature = temperature
 18 |             self.stop = stop
 19 |         }
 20 |     }
 21 | 
 22 |     struct CompletionResponse: Codable {
 23 |         struct Choice: Codable {
 24 |             var text: String
 25 |         }
 26 |         var choices: [Choice]
 27 |     }
 28 | 
 29 |     public func complete(_ completionRequest: CompletionRequest) async throws -> String {
 30 |         let request = try createTextRequest(completionRequest: completionRequest)
 31 |         let (data, response) = try await URLSession.shared.data(for: request)
 32 |         guard let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 else {
 33 |             throw Errors.invalidResponse(String(data: data, encoding: .utf8) ?? "<failed to decode response>")
 34 |         }
 35 |         let completionResponse = try JSONDecoder().decode(CompletionResponse.self, from: data)
 36 |         guard completionResponse.choices.count > 0 else {
 37 |             throw Errors.noChoices
 38 |         }
 39 |         return completionResponse.choices[0].text
 40 |     }
 41 | 
 42 |     public func completeStreaming(_ completionRequest: CompletionRequest) throws -> StreamingCompletion {
 43 |         var cr = completionRequest
 44 |         cr.stream = true
 45 | 
 46 |         let request = try createTextRequest(completionRequest: cr)
 47 |         let src = EventSource(urlRequest: request)
 48 |         let completion = StreamingCompletion()
 49 |         src.onComplete { statusCode, reconnect, error in
 50 |             DispatchQueue.main.async {
 51 |                 if let statusCode, statusCode / 100 == 2 {
 52 |                     completion.status = .complete
 53 |                 }
 54 |             }
 55 |         }
 56 |         src.onMessage { id, event, data in
 57 |             guard let data else { return }
 58 |             let textOpt = decodeStreamingResponse(jsonStr: data)
 59 |             DispatchQueue.main.async {
 60 |                 if let textOpt {
 61 |                     completion.text += textOpt
 62 |                 }
 63 |             }
 64 |         }
 65 |         src.connect()
 66 |         return completion
 67 |     }
 68 | 
 69 |     private func decodeStreamingResponse(jsonStr: String) -> String? {
 70 |         guard let json = try? JSONDecoder().decode(CompletionResponse.self, from: Data(jsonStr.utf8)) else {
 71 |             return nil
 72 |         }
 73 |         return json.choices.first?.text
 74 |     }
 75 | 
 76 |     private func createTextRequest(completionRequest: CompletionRequest) throws -> URLRequest {
 77 |         let url = URL(string: "https://api.openai.com/v1/completions")!
 78 |         var request = URLRequest(url: url)
 79 |         request.httpMethod = "POST"
 80 |         request.setValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization")
 81 |         request.setValue("application/json", forHTTPHeaderField: "Content-Type")
 82 |         if let orgId {
 83 |             request.setValue(orgId, forHTTPHeaderField: "OpenAI-Organization")
 84 |         }
 85 |         request.httpBody = try JSONEncoder().encode(completionRequest)
 86 |         return request
 87 |     }
 88 | }
 89 | 
 90 | public class StreamingCompletion: ObservableObject {
 91 |     public enum Status: Equatable {
 92 |         case loading
 93 |         case complete
 94 |         case error
 95 |     }
 96 |     @Published public var status = Status.loading
 97 |     @Published public var text: String = ""
 98 | 
 99 |     init() {}
100 | }
101 | 


--------------------------------------------------------------------------------
/Sources/OpenAIStreamingCompletions/OpenAI+ChatCompletion.swift:
--------------------------------------------------------------------------------
  1 | import Foundation
  2 | 
  3 | extension OpenAIAPI {
  4 |     public struct Message: Equatable, Codable, Hashable {
  5 |         public enum Role: String, Equatable, Codable, Hashable {
  6 |             case system
  7 |             case user
  8 |             case assistant
  9 |         }
 10 | 
 11 |         public var role: Role
 12 |         public var content: String
 13 | 
 14 |         public init(role: Role, content: String) {
 15 |             self.role = role
 16 |             self.content = content
 17 |         }
 18 |     }
 19 | 
 20 |     public struct ChatCompletionRequest: Codable {
 21 |         var messages: [Message]
 22 |         var model: String
 23 |         var max_tokens: Int = 1500
 24 |         var temperature: Double = 0.2
 25 |         var stream = false
 26 |         var stop: [String]?
 27 | 
 28 |         public init(messages: [Message], model: String = "gpt-3.5-turbo", max_tokens: Int = 1500, temperature: Double = 0.2, stop: [String]? = nil) {
 29 |             self.messages = messages
 30 |             self.model = model
 31 |             self.max_tokens = max_tokens
 32 |             self.temperature = temperature
 33 |             self.stop = stop
 34 |         }
 35 |     }
 36 | 
 37 |     // MARK: - Plain completion
 38 | 
 39 |     struct ChatCompletionResponse: Codable {
 40 |         struct Choice: Codable {
 41 |             var message: Message
 42 |         }
 43 |         var choices: [Choice]
 44 |     }
 45 | 
 46 |     public func completeChat(_ completionRequest: ChatCompletionRequest) async throws -> String {
 47 |         let request = try createChatRequest(completionRequest: completionRequest)
 48 |         let (data, response) = try await URLSession.shared.data(for: request)
 49 |         guard let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 else {
 50 |             throw Errors.invalidResponse(String(data: data, encoding: .utf8) ?? "<failed to decode response>")
 51 |         }
 52 |         let completionResponse = try JSONDecoder().decode(ChatCompletionResponse.self, from: data)
 53 |         guard completionResponse.choices.count > 0 else {
 54 |             throw Errors.noChoices
 55 |         }
 56 |         return completionResponse.choices[0].message.content
 57 |     }
 58 | 
 59 |     // MARK: - Streaming completion
 60 | 
 61 |     public func completeChatStreaming(_ completionRequest: ChatCompletionRequest) throws -> AsyncStream<Message> {
 62 |         var cr = completionRequest
 63 |         cr.stream = true
 64 |         let request = try createChatRequest(completionRequest: cr)
 65 | 
 66 |         return AsyncStream { continuation in
 67 |             let src = EventSource(urlRequest: request)
 68 | 
 69 |             var message = Message(role: .assistant, content: "")
 70 | 
 71 |             src.onComplete { statusCode, reconnect, error in
 72 |                 continuation.finish()
 73 |             }
 74 |             src.onMessage { id, event, data in
 75 |                 guard let data, data != "[DONE]" else { return }
 76 |                 do {
 77 |                     let decoded = try JSONDecoder().decode(ChatCompletionStreamingResponse.self, from: Data(data.utf8))
 78 |                     if let delta = decoded.choices.first?.delta {
 79 |                         message.role = delta.role ?? message.role
 80 |                         message.content += delta.content ?? ""
 81 |                         continuation.yield(message)
 82 |                     }
 83 |                 } catch {
 84 |                     print("Chat completion error: \(error)")
 85 |                 }
 86 |             }
 87 |             src.connect()
 88 |         }
 89 |     }
 90 | 
 91 |     public func completeChatStreamingWithObservableObject(_ completionRequest: ChatCompletionRequest) throws -> StreamingCompletion {
 92 |         let completion = StreamingCompletion()
 93 |         Task {
 94 |             do {
 95 |                 for await message in try self.completeChatStreaming(completionRequest) {
 96 |                     DispatchQueue.main.async {
 97 |                         completion.text = message.content
 98 |                     }
 99 |                 }
100 |                 DispatchQueue.main.async {
101 |                     completion.status = .complete
102 |                 }
103 |             } catch {
104 |                 DispatchQueue.main.async {
105 |                     completion.status = .error
106 |                 }
107 |             }
108 |         }
109 |         return completion
110 |     }
111 | 
112 |     private struct ChatCompletionStreamingResponse: Codable {
113 |         struct Choice: Codable {
114 |             struct MessageDelta: Codable {
115 |                 var role: Message.Role?
116 |                 var content: String?
117 |             }
118 |             var delta: MessageDelta
119 |         }
120 |         var choices: [Choice]
121 |     }
122 | 
123 |     private func decodeChatStreamingResponse(jsonStr: String) -> String? {
124 |         guard let json = try? JSONDecoder().decode(ChatCompletionStreamingResponse.self, from: Data(jsonStr.utf8)) else {
125 |             return nil
126 |         }
127 |         return json.choices.first?.delta.content
128 |     }
129 |     
130 |     private func createChatRequest(completionRequest: ChatCompletionRequest) throws -> URLRequest {
131 |         let url = URL(string: "https://api.openai.com/v1/chat/completions")!
132 |         var request = URLRequest(url: url)
133 |         request.httpMethod = "POST"
134 |         request.setValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization")
135 |         request.setValue("application/json", forHTTPHeaderField: "Content-Type")
136 |         if let orgId {
137 |             request.setValue(orgId, forHTTPHeaderField: "OpenAI-Organization")
138 |         }
139 |         request.httpBody = try JSONEncoder().encode(completionRequest)
140 |         return request
141 |     }
142 | }
143 | 


--------------------------------------------------------------------------------
/Sources/OpenAIStreamingCompletions/EventSource/EventSource.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  EventSource.swift
  3 | //  EventSource
  4 | //
  5 | //  Created by Andres on 2/13/15.
  6 | //  Copyright (c) 2015 Inaka. All rights reserved.
  7 | //
  8 | 
  9 | import Foundation
 10 | 
 11 | public enum EventSourceState {
 12 |     case connecting
 13 |     case open
 14 |     case closed
 15 | }
 16 | 
 17 | public protocol EventSourceProtocol {
 18 |     var headers: [String: String] { get }
 19 | 
 20 |     /// RetryTime: This can be changed remotly if the server sends an event `retry:`
 21 |     var retryTime: Int { get }
 22 | 
 23 |     /// URL where EventSource will listen for events.
 24 |     var url: URL { get }
 25 | 
 26 |     /// The last event id received from server. This id is neccesary to keep track of the last event-id received to avoid
 27 |     /// receiving duplicate events after a reconnection.
 28 |     var lastEventId: String? { get }
 29 | 
 30 |     /// Current state of EventSource
 31 |     var readyState: EventSourceState { get }
 32 | 
 33 |     /// Method used to connect to server. It can receive an optional lastEventId indicating the Last-Event-ID
 34 |     ///
 35 |     /// - Parameter lastEventId: optional value that is going to be added on the request header to server.
 36 |     func connect(lastEventId: String?)
 37 | 
 38 |     /// Method used to disconnect from server.
 39 |     func disconnect()
 40 | 
 41 |     /// Returns the list of event names that we are currently listening for.
 42 |     ///
 43 |     /// - Returns: List of event names.
 44 |     func events() -> [String]
 45 | 
 46 |     /// Callback called when EventSource has successfully connected to the server.
 47 |     ///
 48 |     /// - Parameter onOpenCallback: callback
 49 |     func onOpen(_ onOpenCallback: @escaping (() -> Void))
 50 | 
 51 |     /// Callback called once EventSource has disconnected from server. This can happen for multiple reasons.
 52 |     /// The server could have requested the disconnection or maybe a network layer error, wrong URL or any other
 53 |     /// error. The callback receives as parameters the status code of the disconnection, if we should reconnect or not
 54 |     /// following event source rules and finally the network layer error if any. All this information is more than
 55 |     /// enought for you to take a decition if you should reconnect or not.
 56 |     /// - Parameter onOpenCallback: callback
 57 |     func onComplete(_ onComplete: @escaping ((Int?, Bool?, NSError?) -> Void))
 58 | 
 59 |     /// This callback is called everytime an event with name "message" or no name is received.
 60 |     func onMessage(_ onMessageCallback: @escaping ((_ id: String?, _ event: String?, _ data: String?) -> Void))
 61 | 
 62 |     /// Add an event handler for an specific event name.
 63 |     ///
 64 |     /// - Parameters:
 65 |     ///   - event: name of the event to receive
 66 |     ///   - handler: this handler will be called everytime an event is received with this event-name
 67 |     func addEventListener(_ event: String,
 68 |                           handler: @escaping ((_ id: String?, _ event: String?, _ data: String?) -> Void))
 69 | 
 70 |     /// Remove an event handler for the event-name
 71 |     ///
 72 |     /// - Parameter event: name of the listener to be remove from event source.
 73 |     func removeEventListener(_ event: String)
 74 | }
 75 | 
 76 | open class EventSource: NSObject, EventSourceProtocol, URLSessionDataDelegate {
 77 |     static let DefaultRetryTime = 3000
 78 | 
 79 |     public let urlRequest: URLRequest
 80 |     public var url: URL { urlRequest.url! }
 81 |     private(set) public var lastEventId: String?
 82 |     private(set) public var retryTime = EventSource.DefaultRetryTime
 83 |     private(set) public var headers: [String: String]
 84 |     private(set) public var readyState: EventSourceState
 85 | 
 86 |     private var onOpenCallback: (() -> Void)?
 87 |     private var onComplete: ((Int?, Bool?, NSError?) -> Void)?
 88 |     private var onMessageCallback: ((_ id: String?, _ event: String?, _ data: String?) -> Void)?
 89 |     private var eventListeners: [String: (_ id: String?, _ event: String?, _ data: String?) -> Void] = [:]
 90 | 
 91 |     private var eventStreamParser: EventStreamParser?
 92 |     private var operationQueue: OperationQueue
 93 |     private var mainQueue = DispatchQueue.main
 94 |     private var urlSession: URLSession?
 95 | 
 96 |     public init(
 97 |         urlRequest: URLRequest
 98 |     ) {
 99 |         self.urlRequest = urlRequest
100 |         self.headers = urlRequest.allHTTPHeaderFields ?? [:]
101 | 
102 |         readyState = EventSourceState.closed
103 |         operationQueue = OperationQueue()
104 |         operationQueue.maxConcurrentOperationCount = 1
105 | 
106 |         super.init()
107 |     }
108 | 
109 |     public func connect(lastEventId: String? = nil) {
110 |         eventStreamParser = EventStreamParser()
111 |         readyState = .connecting
112 | 
113 |         let configuration = sessionConfiguration(lastEventId: lastEventId)
114 |         urlSession = URLSession(configuration: configuration, delegate: self, delegateQueue: operationQueue)
115 |         urlSession?.dataTask(with: urlRequest).resume()
116 |     }
117 | 
118 |     public func disconnect() {
119 |         readyState = .closed
120 |         urlSession?.invalidateAndCancel()
121 |     }
122 | 
123 |     public func onOpen(_ onOpenCallback: @escaping (() -> Void)) {
124 |         self.onOpenCallback = onOpenCallback
125 |     }
126 | 
127 |     public func onComplete(_ onComplete: @escaping ((Int?, Bool?, NSError?) -> Void)) {
128 |         self.onComplete = onComplete
129 |     }
130 | 
131 |     public func onMessage(_ onMessageCallback: @escaping ((_ id: String?, _ event: String?, _ data: String?) -> Void)) {
132 |         self.onMessageCallback = onMessageCallback
133 |     }
134 | 
135 |     public func addEventListener(_ event: String,
136 |                                  handler: @escaping ((_ id: String?, _ event: String?, _ data: String?) -> Void)) {
137 |         eventListeners[event] = handler
138 |     }
139 | 
140 |     public func removeEventListener(_ event: String) {
141 |         eventListeners.removeValue(forKey: event)
142 |     }
143 | 
144 |     public func events() -> [String] {
145 |         return Array(eventListeners.keys)
146 |     }
147 | 
148 |     open func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
149 | 
150 |         if readyState != .open {
151 |             return
152 |         }
153 | 
154 |         if let events = eventStreamParser?.append(data: data) {
155 |             notifyReceivedEvents(events)
156 |         }
157 |     }
158 | 
159 |     open func urlSession(_ session: URLSession,
160 |                          dataTask: URLSessionDataTask,
161 |                          didReceive response: URLResponse,
162 |                          completionHandler: @escaping (URLSession.ResponseDisposition) -> Void) {
163 | 
164 |         completionHandler(URLSession.ResponseDisposition.allow)
165 | 
166 |         readyState = .open
167 |         mainQueue.async { [weak self] in self?.onOpenCallback?() }
168 |     }
169 | 
170 |     open func urlSession(_ session: URLSession,
171 |                          task: URLSessionTask,
172 |                          didCompleteWithError error: Error?) {
173 | 
174 |         guard let responseStatusCode = (task.response as? HTTPURLResponse)?.statusCode else {
175 |             mainQueue.async { [weak self] in self?.onComplete?(nil, nil, error as NSError?) }
176 |             return
177 |         }
178 | 
179 |         let reconnect = shouldReconnect(statusCode: responseStatusCode)
180 |         mainQueue.async { [weak self] in self?.onComplete?(responseStatusCode, reconnect, nil) }
181 |     }
182 | 
183 |     open func urlSession(_ session: URLSession,
184 |                          task: URLSessionTask,
185 |                          willPerformHTTPRedirection response: HTTPURLResponse,
186 |                          newRequest request: URLRequest,
187 |                          completionHandler: @escaping (URLRequest?) -> Void) {
188 | 
189 |         var newRequest = request
190 |         self.headers.forEach { newRequest.setValue($1, forHTTPHeaderField: $0) }
191 |         completionHandler(newRequest)
192 |     }
193 | }
194 | 
195 | internal extension EventSource {
196 | 
197 |     func sessionConfiguration(lastEventId: String?) -> URLSessionConfiguration {
198 | 
199 |         var additionalHeaders = headers
200 |         if let eventID = lastEventId {
201 |             additionalHeaders["Last-Event-Id"] = eventID
202 |         }
203 | 
204 |         additionalHeaders["Accept"] = "text/event-stream"
205 |         additionalHeaders["Cache-Control"] = "no-cache"
206 | 
207 |         let sessionConfiguration = URLSessionConfiguration.default
208 |         sessionConfiguration.timeoutIntervalForRequest = TimeInterval(INT_MAX)
209 |         sessionConfiguration.timeoutIntervalForResource = TimeInterval(INT_MAX)
210 |         sessionConfiguration.httpAdditionalHeaders = additionalHeaders
211 | 
212 |         return sessionConfiguration
213 |     }
214 | 
215 |     func readyStateOpen() {
216 |         readyState = .open
217 |     }
218 | }
219 | 
220 | private extension EventSource {
221 | 
222 |     func notifyReceivedEvents(_ events: [Event]) {
223 | 
224 |         for event in events {
225 |             lastEventId = event.id
226 |             retryTime = event.retryTime ?? EventSource.DefaultRetryTime
227 | 
228 |             if event.onlyRetryEvent == true {
229 |                 continue
230 |             }
231 | 
232 |             if event.event == nil || event.event == "message" {
233 |                 mainQueue.async { [weak self] in self?.onMessageCallback?(event.id, "message", event.data) }
234 |             }
235 | 
236 |             if let eventName = event.event, let eventHandler = eventListeners[eventName] {
237 |                 mainQueue.async { eventHandler(event.id, event.event, event.data) }
238 |             }
239 |         }
240 |     }
241 | 
242 |     // Following "5 Processing model" from:
243 |     // https://www.w3.org/TR/2009/WD-eventsource-20090421/#handler-eventsource-onerror
244 |     func shouldReconnect(statusCode: Int) -> Bool {
245 |         switch statusCode {
246 |         case 200:
247 |             return false
248 |         case _ where statusCode > 200 && statusCode < 300:
249 |             return true
250 |         default:
251 |             return false
252 |         }
253 |     }
254 | }
255 | 


--------------------------------------------------------------------------------
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197 |    Unless required by applicable law or agreed to in writing, software
198 |    distributed under the License is distributed on an "AS IS" BASIS,
199 |    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
200 |    See the License for the specific language governing permissions and
201 |    limitations under the License.
202 | 


--------------------------------------------------------------------------------
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389 | 	rootObject = 5F43D6CE29A87180002752A0 /* Project object */;
390 | }
391 | 


--------------------------------------------------------------------------------