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Swift
at main
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/// The encrypted representation of a provider destination stored by the notification database.////// The package owns the durable schema, while the host owns cryptography and key rotation. The/// provider token is therefore opaque to this layer except while the host protection dependency/// seals or opens it.public struct ProtectedNotificationDestination: Equatable, Sendable { public enum Provider: String, Sendable { case apns case fcm }
public init( applicationID: Push.ApplicationID, apnsEnvironment: Push.APNS.Environment? = nil, provider: Provider, ciphertext: Data, fingerprint: String, keyVersion: Int ) { self.applicationID = applicationID self.apnsEnvironment = apnsEnvironment self.provider = provider self.ciphertext = ciphertext self.fingerprint = fingerprint self.keyVersion = keyVersion }
public var applicationID: Push.ApplicationID public var apnsEnvironment: Push.APNS.Environment? public var provider: Provider public var ciphertext: Data public var fingerprint: String public var keyVersion: Int
fileprivate var hasValidEnvironment: Bool { switch provider { case .apns: apnsEnvironment != nil case .fcm: apnsEnvironment == nil } }}
/// Host-owned protection for provider destinations persisted by ``NotificationDatabase``.@DependencyClientpublic struct NotificationDestinationProtectionClient: Sendable { public var protect: @Sendable ( _ destination: Push.Destination, _ installationID: NotificationInstallation.ID ) throws -> ProtectedNotificationDestination public var reveal: @Sendable ( _ destination: ProtectedNotificationDestination, _ installationID: NotificationInstallation.ID ) throws -> Push.Destination}
extension NotificationDestinationProtectionClient: TestDependencyKey { public static let testValue = Self()}
extension DependencyValues { public var notificationDestinationProtectionClient: NotificationDestinationProtectionClient { get { self[NotificationDestinationProtectionClient.self] } set { self[NotificationDestinationProtectionClient.self] = newValue } }}
/// Typed operations over the notification package's tables in `defaultDatabase`.////// This is deliberately not a persistence protocol or a closure-backed client. Database state is/// the source of truth, and each operation uses the database and protection dependencies installed/// by the host at the composition boundary.public struct NotificationDatabase: Sendable { private let database: any DatabaseWriter private let destinationProtection: NotificationDestinationProtectionClient
public init() { @Dependency(\.defaultDatabase) var database @Dependency(\.notificationDestinationProtectionClient) var destinationProtection self.database = database self.destinationProtection = destinationProtection }
public static func registerMigrations(into migrator: inout DatabaseMigrator) { migrator.registerMigration("Create push notification registrations") { database in let installationsTable = NotificationInstallationRow.tableName let registrationsTable = NotificationRegistrationRow.tableName let subscriptionsTable = NotificationSubscriptionRow.tableName let destinationIndex = "\(registrationsTable)_destination" try #sql( """ CREATE TABLE \(quote: installationsTable) ( id TEXT PRIMARY KEY NOT NULL, credentialFingerprint TEXT NOT NULL UNIQUE ) STRICT """ ) .execute(database) try #sql( """ CREATE TABLE \(quote: registrationsTable) ( installationID TEXT PRIMARY KEY NOT NULL REFERENCES \(quote: installationsTable)(id) ON DELETE CASCADE, applicationID TEXT NOT NULL, provider TEXT NOT NULL, destination BLOB NOT NULL, destinationFingerprint TEXT NOT NULL, destinationKeyVersion INTEGER NOT NULL ) STRICT """ ) .execute(database) try #sql( """ CREATE INDEX \(quote: destinationIndex) ON \(quote: registrationsTable) ( applicationID, provider, destinationFingerprint ) """ ) .execute(database) try #sql( """ CREATE TABLE \(quote: subscriptionsTable) ( installationID TEXT NOT NULL REFERENCES \(quote: installationsTable)(id) ON DELETE CASCADE, sourceID TEXT NOT NULL, PRIMARY KEY (installationID, sourceID) ) STRICT """ ) .execute(database) } migrator.registerMigration("Add APNS environment to push registrations") { database in try #sql( """ ALTER TABLE \(quote: NotificationRegistrationRow.tableName) ADD COLUMN apnsEnvironment TEXT """ ) .execute(database) } migrator.registerMigration("Index push notification subscriptions by source") { database in let subscriptionsTable = NotificationSubscriptionRow.tableName let sourceIndex = "\(subscriptionsTable)_source" try #sql( """ CREATE INDEX \(quote: sourceIndex) ON \(quote: subscriptionsTable) (sourceID) """ ) .execute(database) } migrator.registerMigration("Create push notification outbox") { database in let installationsTable = NotificationInstallationRow.tableName let outboxTable = NotificationOutboxRow.tableName let dueIndex = "\(outboxTable)_due" try #sql( """ CREATE TABLE \(quote: outboxTable) ( id INTEGER PRIMARY KEY AUTOINCREMENT, installationID TEXT NOT NULL REFERENCES \(quote: installationsTable)(id) ON DELETE CASCADE, sourceID TEXT NOT NULL, sourceVersion TEXT NOT NULL, reason TEXT NOT NULL, message BLOB NOT NULL, createdAt TEXT NOT NULL, failedAttempts INTEGER NOT NULL, lastAttemptAt TEXT, nextAttemptAt TEXT NOT NULL, deliveredAt TEXT, UNIQUE (installationID, sourceID, sourceVersion, reason) ) STRICT """ ) .execute(database) try #sql( """ CREATE INDEX \(quote: dueIndex) ON \(quote: outboxTable) (deliveredAt, nextAttemptAt, id) """ ) .execute(database) } migrator.registerMigration("Make push notification delivery outcomes terminal") { database in let outboxTable = NotificationOutboxRow.tableName let registrationsTable = NotificationRegistrationRow.tableName let replacementTable = "\(registrationsTable)_with_environment_constraint" let destinationIndex = "\(registrationsTable)_destination" let dueIndex = "\(outboxTable)_due"
for column in [ "discardedAt TEXT", "discardReason TEXT", "providerStatus INTEGER", "providerCode TEXT", ] { try database.execute( sql: "ALTER TABLE \"\(outboxTable)\" ADD COLUMN \(column)" ) }
try database.execute( sql: """ UPDATE "\(outboxTable)" SET discardedAt = CURRENT_TIMESTAMP, discardReason = ? WHERE deliveredAt IS NULL AND installationID IN ( SELECT installationID FROM "\(registrationsTable)" WHERE provider NOT IN ('apns', 'fcm') OR ( provider = 'apns' AND ( apnsEnvironment IS NULL OR apnsEnvironment NOT IN ('development', 'production') ) ) OR (provider = 'fcm' AND apnsEnvironment IS NOT NULL) ) """, arguments: [NotificationDeliveryDiscardReason.invalidRegistration.rawValue] ) try database.execute( sql: """ DELETE FROM "\(registrationsTable)" WHERE provider NOT IN ('apns', 'fcm') OR ( provider = 'apns' AND ( apnsEnvironment IS NULL OR apnsEnvironment NOT IN ('development', 'production') ) ) OR (provider = 'fcm' AND apnsEnvironment IS NOT NULL) """ )
try database.execute( sql: """ CREATE TABLE "\(replacementTable)" ( installationID TEXT PRIMARY KEY NOT NULL REFERENCES "\(NotificationInstallationRow.tableName)"(id) ON DELETE CASCADE, applicationID TEXT NOT NULL, provider TEXT NOT NULL, destination BLOB NOT NULL, destinationFingerprint TEXT NOT NULL, destinationKeyVersion INTEGER NOT NULL, apnsEnvironment TEXT, CHECK ( ( provider = 'apns' AND apnsEnvironment IS NOT NULL AND apnsEnvironment IN ('development', 'production') ) OR (provider = 'fcm' AND apnsEnvironment IS NULL) ) ) STRICT """ ) try database.execute( sql: """ INSERT INTO "\(replacementTable)" ( installationID, applicationID, provider, destination, destinationFingerprint, destinationKeyVersion, apnsEnvironment ) SELECT installationID, applicationID, provider, destination, destinationFingerprint, destinationKeyVersion, apnsEnvironment FROM "\(registrationsTable)" """ ) try database.execute(sql: "DROP TABLE \"\(registrationsTable)\"") try database.execute( sql: "ALTER TABLE \"\(replacementTable)\" RENAME TO \"\(registrationsTable)\"" ) try database.execute( sql: """ CREATE INDEX "\(destinationIndex)" ON "\(registrationsTable)" ( applicationID, provider, destinationFingerprint ) """ ) try database.execute(sql: "DROP INDEX \"\(dueIndex)\"") try database.execute( sql: """ CREATE INDEX "\(dueIndex)" ON "\(outboxTable)" (deliveredAt, discardedAt, nextAttemptAt, id) """ ) } migrator.registerMigration("Add emergency notification delivery") { database in let outboxTable = NotificationOutboxRow.tableName let dueIndex = "\(outboxTable)_due"
try database.execute( sql: "ALTER TABLE \"\(outboxTable)\" ADD COLUMN expiresAt TEXT" ) try database.execute( sql: """ ALTER TABLE "\(outboxTable)" ADD COLUMN deliveryClass TEXT NOT NULL DEFAULT 'standard' CHECK ( (deliveryClass = 'standard' AND expiresAt IS NULL) OR (deliveryClass = 'emergency' AND expiresAt IS NOT NULL) ) """ ) try database.execute(sql: "DROP INDEX \"\(dueIndex)\"") try database.execute( sql: """ CREATE INDEX "\(dueIndex)" ON "\(outboxTable)" ( deliveredAt, discardedAt, nextAttemptAt, deliveryClass, expiresAt, id ) """ ) } }
public func insertInstallation( _ installation: NotificationInstallation, credentialFingerprint: NotificationInstallation.CredentialFingerprint ) async throws { try await database.write { database in try NotificationInstallationRow.insert { NotificationInstallationRow( id: installation.id.rawValue, credentialFingerprint: credentialFingerprint.rawValue ) } .execute(database) } }
public func installationID( for credentialFingerprint: NotificationInstallation.CredentialFingerprint ) async throws -> NotificationInstallation.ID? { try await database.read { database in try NotificationInstallationRow .where { $0.credentialFingerprint.eq(credentialFingerprint.rawValue) } .select(\.id) .fetchOne(database) .map(NotificationInstallation.ID.init(rawValue:)) } }
public func replaceDestination( _ destination: Push.Destination, for installationID: NotificationInstallation.ID ) async throws { let protected = try destinationProtection.protect(destination, installationID) guard protected.hasValidEnvironment else { throw NotificationPersistenceError.invalidProtectedDestination } try await database.write { database in try Self.requireInstallation(installationID, in: database) try NotificationRegistrationRow.upsert { NotificationRegistrationRow( installationID: installationID.rawValue, applicationID: protected.applicationID.rawValue, apnsEnvironment: protected.apnsEnvironment?.rawValue, provider: protected.provider.rawValue, destination: protected.ciphertext, destinationFingerprint: protected.fingerprint, destinationKeyVersion: protected.keyVersion ) } .execute(database) } }
public func replaceSubscriptions( _ subscriptions: Set<NotificationSubscription>, for installationID: NotificationInstallation.ID ) async throws { let rows = subscriptions .map(\.sourceID.rawValue) .sorted() .map { NotificationSubscriptionRow( installationID: installationID.rawValue, sourceID: $0 ) } try await database.write { database in try Self.requireInstallation(installationID, in: database) try NotificationSubscriptionRow .where { $0.installationID.eq(installationID.rawValue) } .delete() .execute(database) guard !rows.isEmpty else { return } try NotificationSubscriptionRow.insert { rows }.execute(database) } }
public func destination( for installationID: NotificationInstallation.ID ) async throws -> Push.Destination? { guard let row = try await database.read({ database in try NotificationRegistrationRow.find(installationID.rawValue).fetchOne(database) }) else { return nil } return try destinationProtection.reveal(row.protectedDestination, installationID) }
public func subscriptions( for installationID: NotificationInstallation.ID ) async throws -> Set<NotificationSubscription> { let rows = try await database.read { database in try NotificationSubscriptionRow .where { $0.installationID.eq(installationID.rawValue) } .order(by: \.sourceID) .fetchAll(database) } return Set( rows.map { NotificationSubscription(sourceID: .init(rawValue: $0.sourceID)) } ) }
@discardableResult public func enqueue( source: NotificationSource, at date: Date ) async throws -> Int { try await database.write { database in try Self.enqueue(source: source, at: date, in: database) } }
@discardableResult public static func enqueue( source: NotificationSource, at date: Date, in database: Database ) throws -> Int { try enqueue( message: NotificationProviderMessage(signal: .sourceAvailable(source)), source: source, reason: "source_available", at: date, in: database ) }
@discardableResult public func enqueue<Route: NotificationRoute>( content: NotificationContent<Route>, at date: Date ) async throws -> Int { try await database.write { database in try Self.enqueue(content: content, at: date, in: database) } }
@discardableResult public static func enqueue<Route: NotificationRoute>( content: NotificationContent<Route>, at date: Date, in database: Database ) throws -> Int { try enqueue( message: NotificationProviderMessage(content: content), source: content.source, reason: "content:\(content.route.notificationRoute)", at: date, in: database ) }
private static func enqueue( message providerMessage: NotificationProviderMessage, source: NotificationSource, reason: String, at date: Date, in database: Database ) throws -> Int { let message = try JSONEncoder().encode( providerMessage.data ) let deliveryClass: String let expiresAt: Date? switch providerMessage.delivery { case .standard: deliveryClass = "standard" expiresAt = nil case .emergency(let expiration): deliveryClass = "emergency" expiresAt = expiration } let outboxTable = NotificationOutboxRow.tableName let registrationsTable = NotificationRegistrationRow.tableName let subscriptionsTable = NotificationSubscriptionRow.tableName try database.execute( sql: """ INSERT OR IGNORE INTO "\(outboxTable)" ( installationID, sourceID, sourceVersion, reason, message, createdAt, failedAttempts, nextAttemptAt, deliveryClass, expiresAt ) SELECT subscription.installationID, ?, ?, ?, ?, ?, 0, ?, ?, ? FROM "\(subscriptionsTable)" AS subscription INNER JOIN "\(registrationsTable)" AS registration ON registration.installationID = subscription.installationID WHERE subscription.sourceID = ? """, arguments: [ source.id.rawValue, source.version.rawValue, reason, message, date, date, deliveryClass, expiresAt, source.id.rawValue, ] ) return database.changesCount }
public func nextDelivery(at date: Date) async throws -> NotificationOutboxDelivery? { let id: Int64? = try await database.write { database in try database.execute( sql: """ UPDATE "\(NotificationOutboxRow.tableName)" SET discardedAt = ?, discardReason = ? WHERE deliveredAt IS NULL AND discardedAt IS NULL AND deliveryClass = 'emergency' AND expiresAt <= ? """, arguments: [ date, NotificationDeliveryDiscardReason.expired.rawValue, date, ] ) return try Int64.fetchOne( database, sql: """ SELECT id FROM "\(NotificationOutboxRow.tableName)" WHERE deliveredAt IS NULL AND discardedAt IS NULL AND nextAttemptAt <= ? ORDER BY CASE deliveryClass WHEN 'emergency' THEN 0 ELSE 1 END, nextAttemptAt, id LIMIT 1 """, arguments: [date] ) } guard let id else { return nil } return try await delivery(id: .init(rawValue: id)) }
fileprivate func nextDeliveryWakeDate() async throws -> Date? { try await database.read { database in try Date.fetchOne( database, sql: """ SELECT MIN( CASE WHEN deliveryClass = 'emergency' AND expiresAt < nextAttemptAt THEN expiresAt ELSE nextAttemptAt END ) FROM "\(NotificationOutboxRow.tableName)" WHERE deliveredAt IS NULL AND discardedAt IS NULL """ ) } }
public func delivery( id: NotificationOutboxDelivery.ID ) async throws -> NotificationOutboxDelivery? { try await database.read { [destinationProtection] database in let outboxTable = NotificationOutboxRow.tableName let registrationsTable = NotificationRegistrationRow.tableName guard let row = try Row.fetchOne( database, sql: """ SELECT outbox.id AS outboxID, outbox.message, outbox.createdAt, outbox.failedAttempts, outbox.nextAttemptAt, outbox.deliveryClass, outbox.expiresAt, registration.installationID, registration.applicationID, registration.apnsEnvironment, registration.provider, registration.destination, registration.destinationFingerprint, registration.destinationKeyVersion FROM "\(outboxTable)" AS outbox INNER JOIN "\(registrationsTable)" AS registration ON registration.installationID = outbox.installationID WHERE outbox.id = ? AND outbox.deliveredAt IS NULL AND outbox.discardedAt IS NULL LIMIT 1 """, arguments: [id.rawValue] ) else { return nil }
let installationID = NotificationInstallation.ID(rawValue: row["installationID"]) let protected = try ProtectedNotificationDestination( applicationID: .init(rawValue: row["applicationID"]), apnsEnvironment: try Self.apnsEnvironment(rawValue: row["apnsEnvironment"]), provider: Self.provider(rawValue: row["provider"]), ciphertext: row["destination"], fingerprint: row["destinationFingerprint"], keyVersion: row["destinationKeyVersion"] ) return NotificationOutboxDelivery( id: .init(rawValue: row["outboxID"]), installationID: installationID, message: try NotificationProviderMessage( json: String(decoding: row["message"] as Data, as: UTF8.self), delivery: try Self.delivery( rawValue: row["deliveryClass"], expiresAt: row["expiresAt"] ) ), destination: try destinationProtection.reveal(protected, installationID), destinationFingerprint: row["destinationFingerprint"], createdAt: row["createdAt"], failedAttempts: row["failedAttempts"], nextAttemptAt: row["nextAttemptAt"] ) } }
/// Records one provider attempt transactionally. Returns `true` only when this row should retry. @discardableResult public func recordProviderResult( _ result: NotificationProviderResult, for delivery: NotificationOutboxDelivery, attemptedAt: Date, retryPolicy: NotificationDeliveryRetryPolicy ) async throws -> Bool { try await database.write { database in switch result { case .accepted(let response): try Self.finish( delivery, at: attemptedAt, response: response, delivered: true, discardReason: nil, in: database ) return false
case .invalidDestination(let response): let currentFingerprint = try String.fetchOne( database, sql: """ SELECT destinationFingerprint FROM "\(NotificationRegistrationRow.tableName)" WHERE installationID = ? """, arguments: [delivery.installationID.rawValue] ) guard currentFingerprint == delivery.destinationFingerprint else { return try Self.retry( delivery, at: attemptedAt, response: response, providerRetryAfter: nil, retryPolicy: retryPolicy, in: database ) }
try database.execute( sql: """ UPDATE "\(NotificationOutboxRow.tableName)" SET discardedAt = ?, discardReason = ?, providerStatus = ?, providerCode = ? WHERE installationID = ? AND deliveredAt IS NULL AND discardedAt IS NULL """, arguments: [ attemptedAt, NotificationDeliveryDiscardReason.invalidDestination.rawValue, response.status, response.code, delivery.installationID.rawValue, ] ) try database.execute( sql: """ DELETE FROM "\(NotificationRegistrationRow.tableName)" WHERE installationID = ? AND destinationFingerprint = ? """, arguments: [ delivery.installationID.rawValue, delivery.destinationFingerprint, ] ) return false
case .permanentFailure(let response): try Self.finish( delivery, at: attemptedAt, response: response, delivered: false, discardReason: .permanentFailure, in: database ) return false
case .retryableFailure(let response, let retryAfter): return try Self.retry( delivery, at: attemptedAt, response: response, providerRetryAfter: retryAfter, retryPolicy: retryPolicy, in: database ) } } }
private static func finish( _ delivery: NotificationOutboxDelivery, at attemptedAt: Date, response: NotificationProviderResponse, delivered: Bool, discardReason: NotificationDeliveryDiscardReason?, in database: Database ) throws { try database.execute( sql: """ UPDATE "\(NotificationOutboxRow.tableName)" SET failedAttempts = failedAttempts + ?, lastAttemptAt = ?, deliveredAt = ?, discardedAt = ?, discardReason = ?, providerStatus = ?, providerCode = ? WHERE id = ? AND deliveredAt IS NULL AND discardedAt IS NULL """, arguments: [ delivered ? 0 : 1, attemptedAt, delivered ? attemptedAt : nil, delivered ? nil : attemptedAt, discardReason?.rawValue, response.status, response.code, delivery.id.rawValue, ] ) guard database.changesCount == 1 else { throw NotificationPersistenceError.unknownOutboxDelivery(delivery.id) } }
private static func retry( _ delivery: NotificationOutboxDelivery, at attemptedAt: Date, response: NotificationProviderResponse, providerRetryAfter: TimeInterval?, retryPolicy: NotificationDeliveryRetryPolicy, in database: Database ) throws -> Bool { let failedAttempts = delivery.failedAttempts + 1 if failedAttempts >= retryPolicy.maximumAttempts { try finish( delivery, at: attemptedAt, response: response, delivered: false, discardReason: .exhaustedAttempts, in: database ) return false }
let backoff = retryPolicy.delayAfterFailure(failedAttempts) let delay = max(backoff, providerRetryAfter ?? 0) let retryAt = attemptedAt.addingTimeInterval(delay) let deadline = delivery.createdAt.addingTimeInterval(retryPolicy.maximumAge) if attemptedAt >= deadline || retryAt >= deadline { try finish( delivery, at: attemptedAt, response: response, delivered: false, discardReason: .exhaustedAge, in: database ) return false }
try database.execute( sql: """ UPDATE "\(NotificationOutboxRow.tableName)" SET failedAttempts = failedAttempts + 1, lastAttemptAt = ?, nextAttemptAt = ?, providerStatus = ?, providerCode = ? WHERE id = ? AND deliveredAt IS NULL AND discardedAt IS NULL """, arguments: [ attemptedAt, retryAt, response.status, response.code, delivery.id.rawValue, ] ) guard database.changesCount == 1 else { throw NotificationPersistenceError.unknownOutboxDelivery(delivery.id) } return true }
private static func provider( rawValue: String ) throws -> ProtectedNotificationDestination.Provider { guard let provider = ProtectedNotificationDestination.Provider(rawValue: rawValue) else { throw NotificationPersistenceError.unsupportedProvider(rawValue) } return provider }
private static func delivery( rawValue: String, expiresAt: Date? ) throws -> NotificationPresentation.Delivery { switch (rawValue, expiresAt) { case ("standard", nil): return .standard case ("emergency", .some(let expiration)): return .emergency(expiresAt: expiration) case ("standard", .some), ("emergency", nil): throw NotificationPersistenceError.invalidNotificationDelivery(rawValue) case (let rawValue, _): throw NotificationPersistenceError.unsupportedNotificationDelivery(rawValue) } }
private static func apnsEnvironment( rawValue: String? ) throws -> Push.APNS.Environment? { guard let rawValue else { return nil } guard let environment = Push.APNS.Environment(rawValue: rawValue) else { throw NotificationPersistenceError.unsupportedAPNSEnvironment(rawValue) } return environment }
private static func requireInstallation( _ installationID: NotificationInstallation.ID, in database: Database ) throws { guard try NotificationInstallationRow.find(installationID.rawValue).fetchOne(database) != nil else { throw NotificationPersistenceError.unknownInstallation(installationID) } }}
public enum NotificationPersistenceError: Error, Equatable, Sendable { case invalidProtectedDestination case unsupportedAPNSEnvironment(String) case invalidNotificationDelivery(String) case unsupportedNotificationDelivery(String) case unsupportedProvider(String) case unknownInstallation(NotificationInstallation.ID) case unknownOutboxDelivery(NotificationOutboxDelivery.ID)}
/// A long-lived sequential worker over the durable notification outbox.public struct NotificationDelivery { @Dependency(\.continuousClock) private var clock @Dependency(\.date) private var date @Dependency(\.notificationProviderClient) private var provider
private let database = NotificationDatabase() private let maximumPollInterval: Duration private let providerTimeout: Duration private let retryPolicy: NotificationDeliveryRetryPolicy
public init( retryPolicy: NotificationDeliveryRetryPolicy = .exponential, maximumPollInterval: Duration = .seconds(1), providerTimeout: Duration = .seconds(30) ) { self.retryPolicy = retryPolicy self.maximumPollInterval = maximumPollInterval self.providerTimeout = providerTimeout }
public func run() async throws { let clock = clock let database = database let date = date let maximumPollInterval = maximumPollInterval let provider = provider let providerTimeout = providerTimeout let retryPolicy = retryPolicy
while true { try Task.checkCancellation()
guard let wakeDate = try await database.nextDeliveryWakeDate() else { try await clock.sleep(for: maximumPollInterval) continue }
let delay = wakeDate.timeIntervalSince(date.now) if delay > 0 { try await clock.sleep( for: min(.seconds(delay), maximumPollInterval) ) continue }
guard let delivery = try await database.nextDelivery(at: date.now) else { continue } try Task.checkCancellation()
let result: NotificationProviderResult do { result = try await Self.send( delivery, with: provider, clock: clock, timeout: providerTimeout ) } catch is NotificationProviderTimeout { result = .retryableFailure( NotificationProviderResponse(code: "provider_timeout") ) } catch is CancellationError { throw CancellationError() } catch { result = .retryableFailure(NotificationProviderResponse()) }
_ = try await database.recordProviderResult( result, for: delivery, attemptedAt: date.now, retryPolicy: retryPolicy ) } }
private static func send( _ delivery: NotificationOutboxDelivery, with provider: NotificationProviderClient, clock: any Clock<Duration>, timeout: Duration ) async throws -> NotificationProviderResult { try await withThrowingTaskGroup(of: NotificationProviderResult.self) { group in group.addTask { try await provider.send(delivery.message, delivery.destination) } group.addTask { try await clock.sleep(for: timeout) throw NotificationProviderTimeout() } defer { group.cancelAll() } guard let result = try await group.next() else { throw CancellationError() } return result } }}
private struct NotificationProviderTimeout: Error {}
@Table("pushInstallations")private struct NotificationInstallationRow: Equatable, Sendable { @Column(primaryKey: true) var id: String var credentialFingerprint: String}
@Table("pushRegistrations")private struct NotificationRegistrationRow: Equatable, Sendable { @Column(primaryKey: true) var installationID: String var applicationID: String var apnsEnvironment: String? var provider: String var destination: Data var destinationFingerprint: String var destinationKeyVersion: Int
var protectedDestination: ProtectedNotificationDestination { get throws { guard let provider = ProtectedNotificationDestination.Provider(rawValue: provider) else { throw NotificationPersistenceError.unsupportedProvider(provider) } return ProtectedNotificationDestination( applicationID: .init(rawValue: applicationID), apnsEnvironment: try Self.apnsEnvironment(rawValue: apnsEnvironment), provider: provider, ciphertext: destination, fingerprint: destinationFingerprint, keyVersion: destinationKeyVersion ) } }
private static func apnsEnvironment( rawValue: String? ) throws -> Push.APNS.Environment? { guard let rawValue else { return nil } guard let environment = Push.APNS.Environment(rawValue: rawValue) else { throw NotificationPersistenceError.unsupportedAPNSEnvironment(rawValue) } return environment }}
@Table("pushSubscriptions")private struct NotificationSubscriptionRow: Equatable, Sendable { var installationID: String var sourceID: String}
@Table("pushOutbox")private struct NotificationOutboxRow: Equatable, Sendable { @Column(primaryKey: true) var id: Int64 var installationID: String var sourceID: String var sourceVersion: String var reason: String var message: Data var createdAt: Date var failedAttempts: Int var lastAttemptAt: Date? var nextAttemptAt: Date var deliveredAt: Date? var discardedAt: Date? var discardReason: String? var providerStatus: Int? var providerCode: String? var deliveryClass: String var expiresAt: Date?}