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/*
* This file is part of GNU Taler, ©2022-23 Taler Systems S.A.
* See LICENSE.md
*/
import Foundation
import taler_swift
import SymLog
import os.log
fileprivate let DATABASE = "talerwalletdb-v30"
fileprivate let ASYNCDELAY: UInt = 0 //set e.g to 6 or 9 seconds for debugging
struct HTTPError: Codable, Hashable {
var code: Int
var requestUrl: String?
var hint: String
var requestMethod: String?
var httpStatusCode: Int?
var when: Timestamp?
var stack: String?
}
// MARK: -
/// Communicate with wallet-core
class WalletModel: ObservableObject {
public static let shared = WalletModel()
let logger = Logger(subsystem: "net.taler.gnu", category: "WalletModel")
let semaphore = AsyncSemaphore(value: 1)
var cachedBalances: [Balance]? = nil
@Published var showError: Bool = false
@Published var error2: ErrorData? = nil
@MainActor func setError(_ theError: Error?) {
if let theError {
self.error2 = .error(theError)
self.showError = true
} else {
self.error2 = nil
self.showError = false
}
}
func sendRequest<T: WalletBackendFormattedRequest> (_ request: T, _ delay: UInt = 0, viewHandles: Bool = false)
async throws -> T.Response { // T for any Thread
#if !DEBUG
logger.log("sending: \(request.operation(), privacy: .public)")
#endif
let sendTime = Date.now
do {
let (response, id) = try await WalletCore.shared.sendFormattedRequest(request)
#if !DEBUG
let timeUsed = Date.now - sendTime
logger.log("received: \(request.operation(), privacy: .public) (\(id, privacy: .public)) after \(timeUsed.milliseconds, privacy: .public) ms")
#endif
let asyncDelay: UInt = delay > 0 ? delay : UInt(ASYNCDELAY)
if asyncDelay > 0 { // test LoadingView, sleep some seconds
try? await Task.sleep(nanoseconds: 1_000_000_000 * UInt64(asyncDelay))
}
return response
} catch { // rethrows
let timeUsed = Date.now - sendTime
logger.error("\(request.operation(), privacy: .public) failed after \(timeUsed.milliseconds, privacy: .public) ms\n\(error, privacy: .public)")
if !viewHandles {
// TODO: symlog + controller sound
await setError(error)
}
throw error
}
}
func getTransactionByIdT(_ transactionId: String, viewHandles: Bool = false)
async throws -> Transaction { // T for any Thread
// might be called from a background thread itself
let request = GetTransactionById(transactionId: transactionId)
return try await sendRequest(request, ASYNCDELAY, viewHandles: viewHandles)
}
/// get the specified transaction from Wallet-Core. No networking involved
@MainActor func getTransactionByIdM(_ transactionId: String, viewHandles: Bool = false)
async throws -> Transaction { // M for MainActor
return try await getTransactionByIdT(transactionId, viewHandles: viewHandles) // call GetTransactionById on main thread
}
}
// MARK: -
/// A request to get a wallet transaction by ID.
fileprivate struct GetTransactionById: WalletBackendFormattedRequest {
typealias Response = Transaction
func operation() -> String { "getTransactionById" }
func args() -> Args { Args(transactionId: transactionId) }
var transactionId: String
struct Args: Encodable {
var transactionId: String
}
}
// MARK: -
/// The info returned from Wallet-core init
struct VersionInfo: Decodable {
var implementationSemver: String?
var implementationGitHash: String?
var version: String
var exchange: String
var merchant: String
var bank: String
}
// MARK: -
fileprivate struct Testing: Encodable {
var denomselAllowLate: Bool
var devModeActive: Bool
var insecureTrustExchange: Bool
var preventThrottling: Bool
var skipDefaults: Bool
var emitObservabilityEvents: Bool
// more to come...
init(devModeActive: Bool) {
self.denomselAllowLate = false
self.devModeActive = devModeActive
self.insecureTrustExchange = false
self.preventThrottling = false
self.skipDefaults = false
self.emitObservabilityEvents = true
}
}
fileprivate struct Builtin: Encodable {
var exchanges: [String]
// more to come...
}
fileprivate struct Config: Encodable {
var testing: Testing
var builtin: Builtin
}
// MARK: -
/// A request to re-configure Wallet-core
fileprivate struct ConfigRequest: WalletBackendFormattedRequest {
var setTesting: Bool
func operation() -> String { "setWalletRunConfig" }
func args() -> Args {
let testing = Testing(devModeActive: setTesting)
let builtin = Builtin(exchanges: [])
let config = Config(testing: testing, builtin: builtin)
return Args(config: config)
}
struct Args: Encodable {
var config: Config
}
struct Response: Decodable {
var versionInfo: VersionInfo
}
}
extension WalletModel {
/// initalize Wallet-Core. Will do networking
func setConfigT(setTesting: Bool) async throws -> VersionInfo {
// T for any Thread
let request = ConfigRequest(setTesting: setTesting)
let response = try await sendRequest(request, 0) // no Delay
return response.versionInfo
}
}
// MARK: -
/// A request to initialize Wallet-core
fileprivate struct InitRequest: WalletBackendFormattedRequest {
var persistentStoragePath: String
var setTesting: Bool
func operation() -> String { "init" }
func args() -> Args {
let testing = Testing(devModeActive: setTesting)
let builtin = Builtin(exchanges: [])
let config = Config(testing: testing, builtin: builtin)
return Args(persistentStoragePath: persistentStoragePath,
// cryptoWorkerType: "sync",
logLevel: "info", // trace, info, warn, error, none
config: config,
useNativeLogging: true)
}
struct Args: Encodable {
var persistentStoragePath: String
// var cryptoWorkerType: String
var logLevel: String
var config: Config
var useNativeLogging: Bool
}
struct Response: Decodable {
var versionInfo: VersionInfo
}
}
extension WalletModel {
/// initalize Wallet-Core. Will do networking
func initWalletCoreT(setTesting: Bool, viewHandles: Bool = false) async throws -> VersionInfo {
// T for any Thread
let docPath = try docPath(sqlite3: true)
let request = InitRequest(persistentStoragePath: docPath, setTesting: setTesting)
let response = try await sendRequest(request, 0, viewHandles: viewHandles) // no Delay
return response.versionInfo
}
private func docPath (sqlite3: Bool) throws -> String {
// if let documentsDir = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first {
if let documentsDir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {
let documentUrl = documentsDir.appendingPathComponent(DATABASE, isDirectory: false)
.appendingPathExtension(sqlite3 ? "sqlite3" : "json")
let docPath = documentUrl.path
logger.debug("\(docPath)")
return docPath
} else { // should never happen
logger.error("No documentDirectory")
throw WalletBackendError.initializationError
}
}
private func cachePath () throws -> String {
let fileManager = FileManager.default
if let cachesURL = fileManager.urls(for: .cachesDirectory, in: .userDomainMask).first {
let cacheURL = cachesURL.appendingPathComponent("cache.json")
let cachePath = cacheURL.path
logger.debug("\(cachePath)")
if !fileManager.fileExists(atPath: cachePath) {
let contents = Data() /// Initialize an empty `Data`.
fileManager.createFile(atPath: cachePath, contents: contents)
print("❗️ File \(cachePath) created")
} else {
print("❗️ File \(cachePath) already exists")
}
return cachePath
} else { // should never happen
logger.error("No cachesDirectory")
throw WalletBackendError.initializationError
}
}
}
// MARK: -
/// A request to reset Wallet-core to a virgin DB. WILL DESTROY ALL COINS
fileprivate struct ResetRequest: WalletBackendFormattedRequest {
func operation() -> String { "clearDb" }
func args() -> Args { Args() }
struct Args: Encodable {} // no arguments needed
struct Response: Decodable {}
}
extension WalletModel {
/// reset Wallet-Core
func resetWalletCoreT(viewHandles: Bool = false) async throws {
// T for any Thread
let request = ResetRequest()
_ = try await sendRequest(request, 0, viewHandles: viewHandles)
}
}
// MARK: -
fileprivate struct DevExperimentRequest: WalletBackendFormattedRequest {
func operation() -> String { "applyDevExperiment" }
func args() -> Args { Args(devExperimentUri: talerUri) }
var talerUri: String
struct Args: Encodable {
var devExperimentUri: String
}
struct Response: Decodable {}
}
extension WalletModel {
/// tell wallet-core to mock new transactions
func devExperimentT(talerUri: String, viewHandles: Bool = false) async throws {
// T for any Thread
let request = DevExperimentRequest(talerUri: talerUri)
_ = try await sendRequest(request, 0, viewHandles: viewHandles)
}
}
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