🌱 · woody.fm/composable-atmosphere-constellation@337039f

+3

.gitignore

··· 1 + .DS_Store 2 + .build/ 3 + .swiftpm/

+20

.tangled/workflows/ci.yml

··· 1 + when: 2 + - event: ["push"] 3 + branch: ["main"] 4 + - event: ["pull_request"] 5 + branch: ["main"] 6 + 7 + engine: microvm 8 + image: nixos 9 + 10 + virtualisation: 11 + docker: true 12 + 13 + steps: 14 + - name: "Build and test" 15 + command: | 16 + docker run --rm \ 17 + --volume "$PWD":/workdir \ 18 + --workdir /workdir \ 19 + swift:6.3-noble \ 20 + bash -lc 'swift build && swift test'

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Package.resolved

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Package.swift

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··· 1 + // swift-tools-version: 6.1 2 + 3 + import PackageDescription 4 + 5 + let package = Package( 6 + name: "composable-atmosphere-constellation", 7 + platforms: [ 8 + .iOS(.v17), 9 + .macOS(.v14), 10 + ], 11 + products: [ 12 + .library( 13 + name: "ComposableAtmosphereConstellation", 14 + targets: ["ComposableAtmosphereConstellation"] 15 + ), 16 + ], 17 + dependencies: [ 18 + .package(url: "https://github.com/pointfreeco/swift-custom-dump", from: "1.0.0"), 19 + .package(url: "https://github.com/pointfreeco/swift-dependencies", branch: "26"), 20 + .package(url: "https://source.woody.fm/swift-dependencies-http-client", branch: "main"), 21 + .package( 22 + url: "https://source.woody.fm/swift-composable-atmosphere", 23 + branch: "main", 24 + traits: [] 25 + ), 26 + ], 27 + targets: [ 28 + .target( 29 + name: "ComposableAtmosphereConstellation", 30 + dependencies: [ 31 + .product(name: "ATProto", package: "swift-composable-atmosphere"), 32 + .product(name: "Dependencies", package: "swift-dependencies"), 33 + .product(name: "HTTPClient", package: "swift-dependencies-http-client"), 34 + .product(name: "XRPCClient", package: "swift-composable-atmosphere"), 35 + ] 36 + ), 37 + .testTarget( 38 + name: "ComposableAtmosphereConstellationTests", 39 + dependencies: [ 40 + "ComposableAtmosphereConstellation", 41 + .product(name: "ATProto", package: "swift-composable-atmosphere"), 42 + .product(name: "CustomDump", package: "swift-custom-dump"), 43 + .product(name: "Dependencies", package: "swift-dependencies"), 44 + .product(name: "HTTPClient", package: "swift-dependencies-http-client"), 45 + .product(name: "XRPCClient", package: "swift-composable-atmosphere"), 46 + ] 47 + ), 48 + ] 49 + )

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README.md

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··· 1 + # Composable Atmosphere Constellation 2 + 3 + Composable Atmosphere Constellation is a Swift package for reading AT Protocol backlinks from Constellation. 4 + 5 + It provides typed request and response models for `blue.microcosm.links.getBacklinks`, plus helpers that hydrate linked records from the author's PDS. Higher-level packages can use it to discover references across the network without coupling their own domain models to Constellation's raw response shape. 6 + 7 + ## Product 8 + 9 + - `ComposableAtmosphereConstellation`: Constellation backlink lexicon models, XRPC request helpers, typed record hydration, and small in-flight request coalescing utilities. 10 + 11 + ## Installation 12 + 13 + Add the package to `Package.swift`: 14 + 15 + ```swift 16 + .package( 17 + url: "https://source.woody.fm/composable-atmosphere-constellation", 18 + branch: "main" 19 + ) 20 + ``` 21 + 22 + Then depend on the library product: 23 + 24 + ```swift 25 + .product( 26 + name: "ComposableAtmosphereConstellation", 27 + package: "composable-atmosphere-constellation" 28 + ) 29 + ``` 30 + 31 + This package depends on the base `ATProto` and `XRPCClient` products from `swift-composable-atmosphere` and explicitly opts out of its default `TCA26` trait. 32 + 33 + ## Usage 34 + 35 + Build a Constellation source from a collection and path: 36 + 37 + ```swift 38 + import ATProto 39 + import ComposableAtmosphereConstellation 40 + 41 + let source = Constellation.BacklinkSource( 42 + collection: "sh.tangled.repo.pull", 43 + path: "target.repo" 44 + ) 45 + ``` 46 + 47 + Fetch backlinks for a DID or record URI: 48 + 49 + ```swift 50 + import XRPCClient 51 + 52 + guard let repo = DID("did:plc:repo") else { 53 + return 54 + } 55 + 56 + let backlinks = try await XRPC.Client.liveValue.constellationGetBacklinks( 57 + subject: repo, 58 + source: source, 59 + limit: 25 60 + ) 61 + ``` 62 + 63 + For typed record hydration, conform the referenced record value to `Constellation.BacklinkedRecordValue` and call `constellationGetBacklinkedRecords`. 64 + 65 + ## Development 66 + 67 + Run the package checks with: 68 + 69 + ```sh 70 + swift build && swift test 71 + ```

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Sources/ComposableAtmosphereConstellation/ConstellationBacklinks.swift

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··· 1 + import ATProto 2 + import Dependencies 3 + import Foundation 4 + import HTTPClient 5 + import XRPCClient 6 + 7 + public enum Constellation { 8 + public enum Lexicon { 9 + public enum NSID { 10 + public static let getBacklinks: ATProto.NSID = "blue.microcosm.links.getBacklinks" 11 + } 12 + 13 + public struct BackLinkSource: 14 + Codable, 15 + Equatable, 16 + ExpressibleByStringLiteral, 17 + Hashable, 18 + RawRepresentable, 19 + Sendable 20 + { 21 + public var rawValue: String 22 + 23 + public init(rawValue: String) { 24 + self.rawValue = rawValue 25 + } 26 + 27 + public init(stringLiteral value: String) { 28 + self.rawValue = value 29 + } 30 + 31 + public init(collection: ATProto.NSID, path: String) { 32 + self.rawValue = "\(collection.rawValue):\(path)" 33 + } 34 + 35 + public init(from decoder: any Decoder) throws { 36 + self.rawValue = try String(from: decoder) 37 + } 38 + 39 + public func encode(to encoder: any Encoder) throws { 40 + try rawValue.encode(to: encoder) 41 + } 42 + } 43 + 44 + public struct BackLinksOutput: Decodable, Equatable, Sendable { 45 + public var total: Int? 46 + public var records: [BackLink] 47 + public var cursor: String? 48 + 49 + public init( 50 + total: Int? = nil, 51 + records: [BackLink], 52 + cursor: String? = nil 53 + ) { 54 + self.total = total 55 + self.records = records 56 + self.cursor = cursor 57 + } 58 + } 59 + 60 + public struct BackLink: Codable, Equatable, Hashable, Identifiable, Sendable { 61 + public var id: ATProto.URI { uri } 62 + 63 + public var did: DID 64 + public var collection: ATProto.NSID 65 + public var rkey: ATProto.Record.Key 66 + 67 + public init( 68 + did: DID, 69 + collection: ATProto.NSID, 70 + rkey: ATProto.Record.Key 71 + ) { 72 + self.did = did 73 + self.collection = collection 74 + self.rkey = rkey 75 + } 76 + 77 + public var uri: ATProto.URI { 78 + ATProto.URI(authority: .did(did), collection: collection, rkey: rkey) 79 + } 80 + } 81 + } 82 + 83 + public enum Service { 84 + public static let host: ATProto.PDSHost = "constellation.microcosm.blue" 85 + } 86 + 87 + public typealias BackLink = Lexicon.BackLink 88 + public typealias Backlink = Lexicon.BackLink 89 + public typealias BackLinkSource = Lexicon.BackLinkSource 90 + public typealias BacklinkSource = Lexicon.BackLinkSource 91 + public typealias BackLinksOutput = Lexicon.BackLinksOutput 92 + public typealias BacklinksOutput = Lexicon.BackLinksOutput 93 + 94 + public protocol BacklinkedRecordValue: Decodable, Sendable { 95 + static var constellationCollection: ATProto.NSID { get } 96 + } 97 + 98 + public struct BacklinkedRecordsOutput<RecordValue: Decodable & Sendable>: Sendable { 99 + public var total: Int? 100 + public var records: [BacklinkedRecord<RecordValue>] 101 + public var cursor: String? 102 + 103 + public init( 104 + total: Int? = nil, 105 + records: [BacklinkedRecord<RecordValue>], 106 + cursor: String? = nil 107 + ) { 108 + self.total = total 109 + self.records = records 110 + self.cursor = cursor 111 + } 112 + } 113 + 114 + public struct BacklinkedRecord<RecordValue: Decodable & Sendable>: 115 + Identifiable, 116 + Sendable 117 + { 118 + public var id: ATProto.URI { uri } 119 + 120 + public var backlink: Backlink 121 + public var uri: ATProto.URI 122 + public var cid: ATProto.CID? 123 + public var value: RecordValue 124 + 125 + public init( 126 + backlink: Backlink, 127 + uri: ATProto.URI, 128 + cid: ATProto.CID? = nil, 129 + value: RecordValue 130 + ) { 131 + self.backlink = backlink 132 + self.uri = uri 133 + self.cid = cid 134 + self.value = value 135 + } 136 + } 137 + 138 + public enum BacklinkedRecordHydrationError: Error, Equatable, Sendable { 139 + case missingPDSHost(DID) 140 + } 141 + 142 + public struct GetBacklinksRequest: XRPC.Request, Sendable { 143 + public typealias Input = Never 144 + public typealias Parameters = Never 145 + public typealias Output = BacklinksOutput 146 + 147 + public static var nsid: ATProto.NSID { Lexicon.NSID.getBacklinks } 148 + public static var type: XRPC.RequestType { .query } 149 + public static var authorizationPolicy: XRPC.AuthorizationPolicy { .none } 150 + public static var routing: XRPC.Routing { .constellation } 151 + 152 + public var subject: String 153 + public var source: BacklinkSource 154 + public var cursor: String? 155 + public var limit: Int? 156 + 157 + public init( 158 + subject: String, 159 + source: BacklinkSource, 160 + cursor: String? = nil, 161 + limit: Int? = nil 162 + ) { 163 + self.subject = subject 164 + self.source = source 165 + self.cursor = cursor 166 + self.limit = limit 167 + } 168 + 169 + public init( 170 + subject: DID, 171 + source: BacklinkSource, 172 + cursor: String? = nil, 173 + limit: Int? = nil 174 + ) { 175 + self.init( 176 + subject: subject.description, 177 + source: source, 178 + cursor: cursor, 179 + limit: limit 180 + ) 181 + } 182 + 183 + public init( 184 + subject: ATProto.URI, 185 + source: BacklinkSource, 186 + cursor: String? = nil, 187 + limit: Int? = nil 188 + ) { 189 + self.init( 190 + subject: subject.description, 191 + source: source, 192 + cursor: cursor, 193 + limit: limit 194 + ) 195 + } 196 + 197 + public var queryItems: [URLQueryItem] { 198 + var items = [ 199 + URLQueryItem(name: "subject", value: subject), 200 + URLQueryItem(name: "source", value: source.rawValue), 201 + ] 202 + if let cursor { 203 + items.append(URLQueryItem(name: "cursor", value: cursor)) 204 + } 205 + if let limit { 206 + items.append(URLQueryItem(name: "limit", value: String(limit))) 207 + } 208 + return items 209 + } 210 + } 211 + } 212 + 213 + public extension XRPC.Routing { 214 + static var constellation: Self { 215 + Self( 216 + unauthenticated: .host(Constellation.Service.host), 217 + authenticated: .host(Constellation.Service.host) 218 + ) 219 + } 220 + } 221 + 222 + public extension XRPC.Client { 223 + func constellationGetBacklinks( 224 + subject: String, 225 + source: Constellation.BacklinkSource, 226 + cursor: String? = nil, 227 + limit: Int? = nil 228 + ) async throws -> Constellation.BacklinksOutput { 229 + try await run( 230 + Constellation.GetBacklinksRequest( 231 + subject: subject, 232 + source: source, 233 + cursor: cursor, 234 + limit: limit 235 + ) 236 + ) 237 + } 238 + 239 + func constellationGetBacklinks( 240 + subject: DID, 241 + source: Constellation.BacklinkSource, 242 + cursor: String? = nil, 243 + limit: Int? = nil 244 + ) async throws -> Constellation.BacklinksOutput { 245 + try await constellationGetBacklinks( 246 + subject: subject.description, 247 + source: source, 248 + cursor: cursor, 249 + limit: limit 250 + ) 251 + } 252 + 253 + func constellationGetBacklinks( 254 + subject: ATProto.URI, 255 + source: Constellation.BacklinkSource, 256 + cursor: String? = nil, 257 + limit: Int? = nil 258 + ) async throws -> Constellation.BacklinksOutput { 259 + try await constellationGetBacklinks( 260 + subject: subject.description, 261 + source: source, 262 + cursor: cursor, 263 + limit: limit 264 + ) 265 + } 266 + 267 + func constellationGetBacklinkedRecords<RecordValue: Constellation.BacklinkedRecordValue>( 268 + _ recordType: RecordValue.Type = RecordValue.self, 269 + subject: String, 270 + source: Constellation.BacklinkSource, 271 + cursor: String? = nil, 272 + limit: Int? = nil 273 + ) async throws -> Constellation.BacklinkedRecordsOutput<RecordValue> { 274 + try await constellationGetBacklinkedRecords( 275 + recordType, 276 + subject: subject, 277 + source: source, 278 + collection: RecordValue.constellationCollection, 279 + cursor: cursor, 280 + limit: limit 281 + ) 282 + } 283 + 284 + func constellationGetBacklinkedRecords<RecordValue: Decodable & Sendable>( 285 + _ recordType: RecordValue.Type = RecordValue.self, 286 + subject: String, 287 + source: Constellation.BacklinkSource, 288 + collection: ATProto.NSID, 289 + cursor: String? = nil, 290 + limit: Int? = nil 291 + ) async throws -> Constellation.BacklinkedRecordsOutput<RecordValue> { 292 + let backlinks = try await constellationGetBacklinks( 293 + subject: subject, 294 + source: source, 295 + cursor: cursor, 296 + limit: limit 297 + ) 298 + return try await constellationHydrateBacklinkedRecords( 299 + recordType, 300 + backlinks: backlinks, 301 + collection: collection 302 + ) 303 + } 304 + 305 + func constellationGetBacklinkedRecords<RecordValue: Constellation.BacklinkedRecordValue>( 306 + _ recordType: RecordValue.Type = RecordValue.self, 307 + subject: DID, 308 + source: Constellation.BacklinkSource, 309 + cursor: String? = nil, 310 + limit: Int? = nil 311 + ) async throws -> Constellation.BacklinkedRecordsOutput<RecordValue> { 312 + try await constellationGetBacklinkedRecords( 313 + recordType, 314 + subject: subject.description, 315 + source: source, 316 + cursor: cursor, 317 + limit: limit 318 + ) 319 + } 320 + 321 + func constellationGetBacklinkedRecords<RecordValue: Decodable & Sendable>( 322 + _ recordType: RecordValue.Type = RecordValue.self, 323 + subject: DID, 324 + source: Constellation.BacklinkSource, 325 + collection: ATProto.NSID, 326 + cursor: String? = nil, 327 + limit: Int? = nil 328 + ) async throws -> Constellation.BacklinkedRecordsOutput<RecordValue> { 329 + try await constellationGetBacklinkedRecords( 330 + recordType, 331 + subject: subject.description, 332 + source: source, 333 + collection: collection, 334 + cursor: cursor, 335 + limit: limit 336 + ) 337 + } 338 + 339 + func constellationGetBacklinkedRecords<RecordValue: Constellation.BacklinkedRecordValue>( 340 + _ recordType: RecordValue.Type = RecordValue.self, 341 + subject: ATProto.URI, 342 + source: Constellation.BacklinkSource, 343 + cursor: String? = nil, 344 + limit: Int? = nil 345 + ) async throws -> Constellation.BacklinkedRecordsOutput<RecordValue> { 346 + try await constellationGetBacklinkedRecords( 347 + recordType, 348 + subject: subject.description, 349 + source: source, 350 + cursor: cursor, 351 + limit: limit 352 + ) 353 + } 354 + 355 + func constellationGetBacklinkedRecords<RecordValue: Decodable & Sendable>( 356 + _ recordType: RecordValue.Type = RecordValue.self, 357 + subject: ATProto.URI, 358 + source: Constellation.BacklinkSource, 359 + collection: ATProto.NSID, 360 + cursor: String? = nil, 361 + limit: Int? = nil 362 + ) async throws -> Constellation.BacklinkedRecordsOutput<RecordValue> { 363 + try await constellationGetBacklinkedRecords( 364 + recordType, 365 + subject: subject.description, 366 + source: source, 367 + collection: collection, 368 + cursor: cursor, 369 + limit: limit 370 + ) 371 + } 372 + 373 + private func constellationHydrateBacklinkedRecords<RecordValue: Decodable & Sendable>( 374 + _ recordType: RecordValue.Type, 375 + backlinks: Constellation.BacklinksOutput, 376 + collection: ATProto.NSID 377 + ) async throws -> Constellation.BacklinkedRecordsOutput<RecordValue> { 378 + @Dependency(Atmosphere.Account.Client.self) var accountClient 379 + var didResolver = ConstellationDIDDocumentResolver(accountClient: accountClient) 380 + 381 + var records: [Constellation.BacklinkedRecord<RecordValue>] = [] 382 + records.reserveCapacity(backlinks.records.count) 383 + 384 + for backlink in backlinks.records where backlink.collection == collection { 385 + let document = try await didResolver.document(for: backlink.did) 386 + guard let pdsHost = document.pdsHost else { 387 + throw Constellation.BacklinkedRecordHydrationError.missingPDSHost(backlink.did) 388 + } 389 + 390 + let record: ATProto.Repository.ListedRecord<RecordValue> 391 + do { 392 + record = try await getRecord( 393 + recordType, 394 + repo: backlink.did.description, 395 + collection: collection, 396 + rkey: backlink.rkey, 397 + pdsHost: pdsHost 398 + ) 399 + } catch { 400 + guard !isMissingBacklinkedRecord(error) else { continue } 401 + throw error 402 + } 403 + records.append( 404 + Constellation.BacklinkedRecord( 405 + backlink: backlink, 406 + uri: record.uri, 407 + cid: record.cid, 408 + value: record.value 409 + ) 410 + ) 411 + } 412 + 413 + return Constellation.BacklinkedRecordsOutput( 414 + total: backlinks.total, 415 + records: records, 416 + cursor: backlinks.cursor 417 + ) 418 + } 419 + } 420 + 421 + private struct ConstellationDIDDocumentResolver { 422 + private static let tasks = TaskUnifier<DID, DID.Document>() 423 + 424 + var accountClient: Atmosphere.Account.Client 425 + private var documents: [DID: DID.Document] = [:] 426 + 427 + init(accountClient: Atmosphere.Account.Client) { 428 + self.accountClient = accountClient 429 + } 430 + 431 + mutating func document(for did: DID) async throws -> DID.Document { 432 + if let document = documents[did] { 433 + return document 434 + } 435 + 436 + let accountClient = accountClient 437 + let document = try await Self.tasks.value(for: did) { 438 + let (_, document) = try await accountClient.resolveDID(did) 439 + return document 440 + } 441 + documents[did] = document 442 + return document 443 + } 444 + } 445 + 446 + private func isMissingBacklinkedRecord(_ error: any Error) -> Bool { 447 + guard 448 + let httpError = error as? HTTPError, 449 + case let .httpError(status, _, _) = httpError 450 + else { 451 + return false 452 + } 453 + return status.code == 404 454 + }

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Sources/ComposableAtmosphereConstellation/TaskUnifier.swift

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··· 1 + public actor TaskUnifier<Key: Hashable & Sendable, Value: Sendable> { 2 + private var tasks: [Key: Task<Value, Error>] = [:] 3 + 4 + public init() {} 5 + 6 + public func value( 7 + for key: Key, 8 + operation: @Sendable @escaping () async throws -> Value 9 + ) async throws -> Value { 10 + if let task = tasks[key] { 11 + return try await task.value 12 + } 13 + 14 + let task = Task { 15 + try await operation() 16 + } 17 + tasks[key] = task 18 + 19 + do { 20 + let value = try await task.value 21 + tasks[key] = nil 22 + return value 23 + } catch { 24 + tasks[key] = nil 25 + throw error 26 + } 27 + } 28 + }

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Tests/ComposableAtmosphereConstellationTests/ComposableAtmosphereConstellationTests.swift

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··· 1 + import ATProto 2 + import ComposableAtmosphereConstellation 3 + import CustomDump 4 + import Dependencies 5 + import Foundation 6 + import HTTPClient 7 + import Testing 8 + import XRPCClient 9 + 10 + @Suite("ComposableAtmosphereConstellation") 11 + struct ComposableAtmosphereConstellationTests { 12 + @Test 13 + func backlinkSourceBuildsCollectionPathSource() { 14 + let source = Constellation.BacklinkSource( 15 + collection: "sh.tangled.repo.pull", 16 + path: "target.repo" 17 + ) 18 + 19 + #expect(source.rawValue == "sh.tangled.repo.pull:target.repo") 20 + } 21 + 22 + @Test 23 + func backlinkSourceCodableShapeIsAString() throws { 24 + let source = Constellation.BacklinkSource( 25 + collection: "sh.tangled.repo.pull.status", 26 + path: "pull" 27 + ) 28 + 29 + let data = try JSONEncoder().encode(source) 30 + #expect(String(decoding: data, as: UTF8.self) == #""sh.tangled.repo.pull.status:pull""#) 31 + 32 + let decoded = try JSONDecoder().decode(Constellation.BacklinkSource.self, from: data) 33 + #expect(decoded == source) 34 + } 35 + 36 + @Test 37 + func getBacklinksRequestBuildsQueryAndRoutesToConstellation() throws { 38 + let subject = try #require(DID("did:plc:repo")) 39 + let request = Constellation.GetBacklinksRequest( 40 + subject: subject, 41 + source: "sh.tangled.repo.pull:target.repo", 42 + cursor: "next", 43 + limit: 25 44 + ) 45 + 46 + #expect(Constellation.GetBacklinksRequest.nsid == "blue.microcosm.links.getBacklinks") 47 + #expect(request.queryItems == [ 48 + URLQueryItem(name: "subject", value: "did:plc:repo"), 49 + URLQueryItem(name: "source", value: "sh.tangled.repo.pull:target.repo"), 50 + URLQueryItem(name: "cursor", value: "next"), 51 + URLQueryItem(name: "limit", value: "25"), 52 + ]) 53 + #expect(request.authorizationPolicy == .none) 54 + #expect(request.routing == XRPC.Routing.constellation) 55 + } 56 + 57 + @Test 58 + func taskUnifierSharesInFlightWorkForMatchingKeys() async throws { 59 + let operation = BlockingOperation() 60 + let unifier = TaskUnifier<String, Int>() 61 + 62 + async let first = unifier.value(for: "did:plc:author") { 63 + await operation.run() 64 + } 65 + await operation.waitUntilStarted() 66 + 67 + async let second = unifier.value(for: "did:plc:author") { 68 + Issue.record("Duplicate operation should reuse the first task") 69 + return 2 70 + } 71 + await Task.yield() 72 + #expect(await operation.runCount() == 1) 73 + 74 + await operation.resume() 75 + let values = try await [first, second] 76 + expectNoDifference(values, [1, 1]) 77 + #expect(await operation.runCount() == 1) 78 + } 79 + 80 + @Test 81 + func decodesBacklinkResponseAndBuildsRecordURI() throws { 82 + let output = try JSONDecoder().decode( 83 + Constellation.Lexicon.BackLinksOutput.self, 84 + from: Data( 85 + """ 86 + { 87 + "total": 2, 88 + "records": [ 89 + { 90 + "did": "did:plc:author", 91 + "collection": "sh.tangled.repo.pull", 92 + "rkey": "3pull" 93 + } 94 + ], 95 + "cursor": "100e0f" 96 + } 97 + """.utf8 98 + ) 99 + ) 100 + 101 + #expect(output.total == 2) 102 + #expect(output.cursor == "100e0f") 103 + let backlink = try #require(output.records.first) 104 + let readableBacklink: Constellation.Backlink = backlink 105 + let readableBackLink: Constellation.BackLink = backlink 106 + #expect(backlink.did.description == "did:plc:author") 107 + #expect(backlink.collection == "sh.tangled.repo.pull") 108 + #expect(backlink.rkey == "3pull") 109 + #expect(backlink.uri.description == "at://did:plc:author/sh.tangled.repo.pull/3pull") 110 + #expect(backlink.id == backlink.uri) 111 + #expect(readableBacklink == backlink) 112 + #expect(readableBackLink == backlink) 113 + } 114 + 115 + @Test 116 + func getBacklinkedRecordsHydratesTypedRecordsFromAuthorPDS() async throws { 117 + let requestLog = RequestLog() 118 + let authorDID = try #require(DID("did:plc:author")) 119 + 120 + let output = try await withDependencies { 121 + $0[Atmosphere.Account.Client.self] = .testClient( 122 + did: authorDID, 123 + handle: "author.example", 124 + pdsHost: "author.pds.example" 125 + ) 126 + $0.xrpcAuthorizationGate = XRPC.AuthorizationGate { _, routing, _ in 127 + let requestIndex = await requestLog.record(routing) 128 + 129 + switch requestIndex { 130 + case 0: 131 + return Data( 132 + """ 133 + { 134 + "total": 1, 135 + "records": [ 136 + { 137 + "did": "did:plc:author", 138 + "collection": "community.test.record", 139 + "rkey": "3record" 140 + } 141 + ], 142 + "cursor": "next" 143 + } 144 + """.utf8 145 + ) 146 + 147 + case 1: 148 + return Data( 149 + """ 150 + { 151 + "uri": "at://did:plc:author/community.test.record/3record", 152 + "cid": "bafyreirecord", 153 + "value": { 154 + "$type": "community.test.record", 155 + "title": "Hydrated" 156 + } 157 + } 158 + """.utf8 159 + ) 160 + 161 + default: 162 + Issue.record("Unexpected XRPC request") 163 + return Data("{}".utf8) 164 + } 165 + } 166 + } operation: { 167 + try await XRPC.Client.liveValue.constellationGetBacklinkedRecords( 168 + TestBacklinkedRecord.self, 169 + subject: try #require(DID("did:plc:subject")), 170 + source: "community.test.record:subject", 171 + limit: 10 172 + ) 173 + } 174 + 175 + #expect(output.total == 1) 176 + #expect(output.cursor == "next") 177 + let record = try #require(output.records.first) 178 + #expect(record.backlink.did == authorDID) 179 + #expect(record.backlink.collection == TestBacklinkedRecord.constellationCollection) 180 + #expect(record.uri.description == "at://did:plc:author/community.test.record/3record") 181 + #expect(record.cid == "bafyreirecord") 182 + #expect(record.value == TestBacklinkedRecord(type: "community.test.record", title: "Hydrated")) 183 + 184 + let routes = await requestLog.routes() 185 + #expect(routes == [ 186 + .constellation, 187 + XRPC.Routing( 188 + unauthenticated: .host("author.pds.example"), 189 + authenticated: .host("author.pds.example") 190 + ), 191 + ]) 192 + } 193 + 194 + @Test 195 + func getBacklinkedRecordsReusesDIDResolutionAcrossDuplicateAuthorBacklinks() async throws { 196 + let requestLog = RequestLog() 197 + let didResolutionCount = Counter() 198 + let authorDID = try #require(DID("did:plc:duplicateauthor")) 199 + 200 + let output = try await withDependencies { 201 + $0[Atmosphere.Account.Client.self] = Atmosphere.Account.Client( 202 + resolveHandle: { _ in 203 + throw TestAccountClientFailure.unexpectedResolution 204 + }, 205 + resolveDID: { resolvedDID in 206 + #expect(resolvedDID == authorDID) 207 + await didResolutionCount.increment() 208 + return ( 209 + Atmosphere.Account(id: .init(authorDID), handle: "author.example"), 210 + try didDocument( 211 + did: authorDID, 212 + handle: "author.example", 213 + pdsHost: "author.pds.example" 214 + ) 215 + ) 216 + } 217 + ) 218 + $0.xrpcAuthorizationGate = XRPC.AuthorizationGate { _, routing, _ in 219 + let requestIndex = await requestLog.record(routing) 220 + 221 + switch requestIndex { 222 + case 0: 223 + return Data( 224 + """ 225 + { 226 + "total": 2, 227 + "records": [ 228 + { 229 + "did": "did:plc:duplicateauthor", 230 + "collection": "community.test.record", 231 + "rkey": "3first" 232 + }, 233 + { 234 + "did": "did:plc:duplicateauthor", 235 + "collection": "community.test.record", 236 + "rkey": "3second" 237 + } 238 + ] 239 + } 240 + """.utf8 241 + ) 242 + 243 + case 1: 244 + return Data( 245 + """ 246 + { 247 + "uri": "at://did:plc:duplicateauthor/community.test.record/3first", 248 + "cid": "bafyreibfirst", 249 + "value": { 250 + "$type": "community.test.record", 251 + "title": "First" 252 + } 253 + } 254 + """.utf8 255 + ) 256 + 257 + case 2: 258 + return Data( 259 + """ 260 + { 261 + "uri": "at://did:plc:duplicateauthor/community.test.record/3second", 262 + "cid": "bafyreibsecond", 263 + "value": { 264 + "$type": "community.test.record", 265 + "title": "Second" 266 + } 267 + } 268 + """.utf8 269 + ) 270 + 271 + default: 272 + Issue.record("Unexpected XRPC request") 273 + return Data("{}".utf8) 274 + } 275 + } 276 + } operation: { 277 + try await XRPC.Client.liveValue.constellationGetBacklinkedRecords( 278 + TestBacklinkedRecord.self, 279 + subject: try #require(DID("did:plc:subject")), 280 + source: "community.test.record:subject", 281 + limit: 10 282 + ) 283 + } 284 + 285 + expectNoDifference( 286 + output.records.map(\.value.title), 287 + ["First", "Second"] 288 + ) 289 + #expect(await didResolutionCount.value() == 1) 290 + let routes = await requestLog.routes() 291 + expectNoDifference( 292 + routes, 293 + [ 294 + .constellation, 295 + XRPC.Routing( 296 + unauthenticated: .host("author.pds.example"), 297 + authenticated: .host("author.pds.example") 298 + ), 299 + XRPC.Routing( 300 + unauthenticated: .host("author.pds.example"), 301 + authenticated: .host("author.pds.example") 302 + ), 303 + ] 304 + ) 305 + } 306 + 307 + @Test 308 + func getBacklinkedRecordsSkipsDeletedRecordsWhenBacklinkIsStale() async throws { 309 + let requestLog = RequestLog() 310 + let authorDID = try #require(DID("did:plc:author")) 311 + 312 + let output = try await withDependencies { 313 + $0[Atmosphere.Account.Client.self] = .testClient( 314 + did: authorDID, 315 + handle: "author.example", 316 + pdsHost: "author.pds.example" 317 + ) 318 + $0.httpClient = .liveValue 319 + $0.requestInterceptors = [] 320 + $0.responseInterceptors = [] 321 + $0.errorInterceptors = [] 322 + $0.xrpcAuthorizationGate = XRPC.AuthorizationGate { _, routing, operation in 323 + let requestIndex = await requestLog.record(routing) 324 + 325 + guard requestIndex != 0 else { 326 + return Data( 327 + """ 328 + { 329 + "total": 2, 330 + "records": [ 331 + { 332 + "did": "did:plc:author", 333 + "collection": "community.test.record", 334 + "rkey": "3deleted" 335 + }, 336 + { 337 + "did": "did:plc:author", 338 + "collection": "community.test.record", 339 + "rkey": "3record" 340 + } 341 + ] 342 + } 343 + """.utf8 344 + ) 345 + } 346 + 347 + return try await routing.withUnauthenticatedRoute { 348 + try await operation() 349 + } 350 + } 351 + $0.dataForURL = { request, _ in 352 + let rkey = try #require(request.url?.queryValue(named: "rkey")) 353 + switch rkey { 354 + case "3deleted": 355 + return (Data(#"{"error":"RecordNotFound"}"#.utf8), .init(status: 404)) 356 + 357 + case "3record": 358 + return ( 359 + Data( 360 + """ 361 + { 362 + "uri": "at://did:plc:author/community.test.record/3record", 363 + "cid": "bafyreirecord", 364 + "value": { 365 + "$type": "community.test.record", 366 + "title": "Hydrated" 367 + } 368 + } 369 + """.utf8 370 + ), 371 + .init(status: 200) 372 + ) 373 + 374 + default: 375 + Issue.record("Unexpected record rkey: \(rkey)") 376 + return (Data(), .init(status: 500)) 377 + } 378 + } 379 + } operation: { 380 + try await XRPC.Client.liveValue.constellationGetBacklinkedRecords( 381 + TestBacklinkedRecord.self, 382 + subject: try #require(DID("did:plc:subject")), 383 + source: "community.test.record:subject", 384 + limit: 10 385 + ) 386 + } 387 + 388 + #expect(output.total == 2) 389 + expectNoDifference( 390 + output.records.map(\.uri.description), 391 + ["at://did:plc:author/community.test.record/3record"] 392 + ) 393 + let record = try #require(output.records.first) 394 + #expect(record.backlink.rkey == "3record") 395 + #expect(record.value == TestBacklinkedRecord(type: "community.test.record", title: "Hydrated")) 396 + } 397 + } 398 + 399 + private actor BlockingOperation { 400 + private var continuation: CheckedContinuation<Void, Never>? 401 + private var started = false 402 + private var count = 0 403 + 404 + func run() async -> Int { 405 + count += 1 406 + started = true 407 + await withCheckedContinuation { continuation in 408 + self.continuation = continuation 409 + } 410 + return 1 411 + } 412 + 413 + func waitUntilStarted() async { 414 + while !started { 415 + await Task.yield() 416 + } 417 + } 418 + 419 + func resume() { 420 + continuation?.resume() 421 + continuation = nil 422 + } 423 + 424 + func runCount() -> Int { 425 + count 426 + } 427 + } 428 + 429 + private actor Counter { 430 + private var count = 0 431 + 432 + func increment() { 433 + count += 1 434 + } 435 + 436 + func value() -> Int { 437 + count 438 + } 439 + } 440 + 441 + private actor RequestLog { 442 + private var index = 0 443 + private var recordedRoutes: [XRPC.Routing] = [] 444 + 445 + func record(_ route: XRPC.Routing) -> Int { 446 + defer { index += 1 } 447 + recordedRoutes.append(route) 448 + return index 449 + } 450 + 451 + func routes() -> [XRPC.Routing] { 452 + recordedRoutes 453 + } 454 + } 455 + 456 + private struct TestBacklinkedRecord: Codable, Equatable, Constellation.BacklinkedRecordValue { 457 + static let constellationCollection: ATProto.NSID = "community.test.record" 458 + 459 + var type: String 460 + var title: String 461 + 462 + enum CodingKeys: String, CodingKey { 463 + case type = "$type" 464 + case title 465 + } 466 + } 467 + 468 + private extension Atmosphere.Account.Client { 469 + static func testClient( 470 + did: DID, 471 + handle: Atmosphere.Account.Handle, 472 + pdsHost: String 473 + ) -> Self { 474 + Self( 475 + resolveHandle: { resolvedHandle in 476 + guard resolvedHandle == handle else { 477 + throw TestAccountClientFailure.unexpectedResolution 478 + } 479 + return ( 480 + Atmosphere.Account(id: .init(did), handle: handle), 481 + try didDocument(did: did, handle: handle, pdsHost: pdsHost) 482 + ) 483 + }, 484 + resolveDID: { resolvedDID in 485 + guard resolvedDID == did else { 486 + throw TestAccountClientFailure.unexpectedResolution 487 + } 488 + return ( 489 + Atmosphere.Account(id: .init(did), handle: handle), 490 + try didDocument(did: did, handle: handle, pdsHost: pdsHost) 491 + ) 492 + } 493 + ) 494 + } 495 + } 496 + 497 + private enum TestAccountClientFailure: Error { 498 + case unexpectedResolution 499 + } 500 + 501 + private func didDocument( 502 + did: DID, 503 + handle: Atmosphere.Account.Handle, 504 + pdsHost: String 505 + ) throws -> DID.Document { 506 + try JSONDecoder().decode( 507 + DID.Document.self, 508 + from: Data( 509 + """ 510 + { 511 + "id": "\(did.description)", 512 + "alsoKnownAs": ["at://\(handle.rawValue)"], 513 + "verificationMethod": [], 514 + "service": [ 515 + { 516 + "id": "#atproto_pds", 517 + "type": "AtprotoPersonalDataServer", 518 + "serviceEndpoint": "https://\(pdsHost)" 519 + } 520 + ] 521 + } 522 + """ 523 + .utf8 524 + ) 525 + ) 526 + } 527 + 528 + private extension URL { 529 + func queryValue(named name: String) -> String? { 530 + URLComponents(url: self, resolvingAgainstBaseURL: false)? 531 + .queryItems? 532 + .first { $0.name == name }? 533 + .value 534 + } 535 + }

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