bridge.ts

// NB this new "bridge" is a re-take of live-desktop bridge ideas
// with a focus to eventually make it shared across both projects.
// a WalletBridge is implemented on renderer side.
// this is an abstraction on top of underlying blockchains api (libcore / ethereumjs / ripple js / ...)
// that would directly be called from UI needs.
import { BigNumber } from "bignumber.js";
import type { Observable } from "rxjs";
import type {
  AccountLike,
  Account,
  AccountRaw,
  CryptoCurrency,
  TransactionStatus,
  Transaction,
  SignOperationEvent,
  SignedOperation,
  Operation,
  DerivationMode,
  SyncConfig,
  CryptoCurrencyIds,
} from ".";
export type ScanAccountEvent = {
  type: "discovered";
  account: Account;
};
// more events will come in the future
export type ScanAccountEventRaw = {
  type: "discovered";
  account: AccountRaw;
};
// unique identifier of a device. it will depends on the underlying implementation.
export type DeviceId = string;
export type PreloadStrategy = Partial<{
  preloadMaxAge: number;
}>;

export type BroadcastArg0 = {
  account: Account;
  signedOperation: SignedOperation;
};
export type SignOperationArg0<T> = {
  account: Account;
  transaction: T;
  deviceId: DeviceId;
};
export type SignOperationFnSignature<T> = (
  arg0: SignOperationArg0<T>
) => Observable<SignOperationEvent>;
export type BroadcastFnSignature = (arg0: BroadcastArg0) => Promise<Operation>;
// Abstraction related to a currency
export interface CurrencyBridge {
  // Preload data required for the bridges to work. (e.g. tokens, delegators,...)
  // Assume to call it at every load time but as lazy as possible (if user have such account already AND/OR if user is about to scanAccounts)
  // returned value is a serializable object
  // fail if data was not able to load.
  preload(currency: CryptoCurrency): Promise<Record<string, any>>;
  // reinject the preloaded data (typically if it was cached)
  // method need to treat the data object as unsafe and validate all fields / be backward compatible.
  hydrate(data: unknown, currency: CryptoCurrency): void;
  // Scan all available accounts with a device
  scanAccounts(arg0: {
    currency: CryptoCurrency;
    deviceId: DeviceId;
    scheme?: DerivationMode | null | undefined;
    syncConfig: SyncConfig;
    preferredNewAccountScheme?: DerivationMode;
  }): Observable<ScanAccountEvent>;
  getPreloadStrategy?: (currency: CryptoCurrency) => PreloadStrategy;
}
// Abstraction related to an account
export interface AccountBridge<T extends Transaction> {
  // synchronizes an account continuously to update with latest blochchains state.
  // The function emits updater functions each time there are data changes (e.g. blockchains updates)
  // an update function is just a Account => Account that perform the changes (to avoid race condition issues)
  // initialAccount parameter is used to point which account is the synchronization on, but it should not be used in the emitted values.
  // the sync can be stopped at any time using Observable's subscription.unsubscribe()
  sync(
    initialAccount: Account,
    syncConfig: SyncConfig
  ): Observable<(arg0: Account) => Account>;
  receive(
    account: Account,
    arg1: {
      verify?: boolean;
      deviceId: string;
      subAccountId?: string;
      freshAddressIndex?: number;
    }
  ): Observable<{
    address: string;
    path: string;
  }>;
  // a Transaction object is created on UI side as a black box to put all temporary information to build the transaction at the end.
  // There are a bunch of edit and get functions to edit and extract information out ot this black box.
  // it needs to be a serializable JS object
  createTransaction(account: Account): T;
  updateTransaction(t: T, patch: Partial<T>): T;
  // prepare the remaining missing part of a transaction typically from network (e.g. fees)
  // and fulfill it in a new transaction object that is returned (async)
  // It can fails if the the network is down.
  prepareTransaction(account: Account, transaction: T): Promise<T>;
  // calculate derived state of the Transaction, useful to display summary / errors / warnings. tells if the transaction is ready.
  getTransactionStatus(
    account: Account,
    transaction: T
  ): Promise<TransactionStatus>;
  // heuristic that provides the estimated max amount that can be set to a send.
  // this is usually the balance minus the fees, but it really depends between coins (reserve, burn, frozen part of the balance,...).
  // it is a heuristic in that this is not necessarily correct and it can be +-delta (so the info can exceed the spendable or leave some dust).
  // it's used as informative UI and also used for "dry run" approaches, but it shouldn't be used to determine the final SEND MAX amount.
  // it returns an amount in the account unit
  // if a transaction is provided, it can be used to precise the information
  // if it not provided, you can assume to take the worst-case scenario (like sending all UTXOs to a legacy address has higher fees resulting in a lower max spendable)
  estimateMaxSpendable(arg0: {
    account: AccountLike;
    parentAccount?: Account | null | undefined;
    transaction?: T | null | undefined;
  }): Promise<BigNumber>;
  // finalizing a transaction by signing it with the ledger device
  // This results of a "signed" event with a signedOperation
  // than can be locally saved and later broadcasted
  signOperation: SignOperationFnSignature<T>;
  // broadcasting a signed transaction to network
  // returns an optimistic Operation that this transaction is likely to create in the future
  broadcast: BroadcastFnSignature;
}
type ExpectFn = (...args: Array<any>) => any;
export type CurrenciesData<T extends Transaction> = {
  FIXME_ignoreAccountFields?: string[];
  FIXME_ignoreOperationFields?: string[];
  mockDeviceOptions?: any;
  scanAccounts?: Array<{
    name: string;
    apdus: string;
    unstableAccounts?: boolean;
    test?: (
      expect: ExpectFn,
      scanned: Account[],
      bridge: CurrencyBridge
    ) => any;
  }>;
  accounts?: Array<{
    implementations?: string[];
    raw: AccountRaw;
    FIXME_tests?: Array<string | RegExp>;
    transactions?: Array<{
      name: string;
      transaction: T | ((arg0: T, arg1: Account, arg2: AccountBridge<T>) => T);
      expectedStatus?:
        | Partial<TransactionStatus>
        | ((
            arg0: Account,
            arg1: T,
            arg2: TransactionStatus
          ) => Partial<TransactionStatus>);
      test?: (
        arg0: ExpectFn,
        arg1: T,
        arg2: TransactionStatus,
        arg3: AccountBridge<T>
      ) => any;
      apdus?: string;
      testSignedOperation?: (
        arg0: ExpectFn,
        arg1: SignedOperation,
        arg2: Account,
        arg3: T,
        arg4: TransactionStatus,
        arg5: AccountBridge<T>
      ) => any;
    }>;
    test?: (arg0: ExpectFn, arg1: Account, arg2: AccountBridge<T>) => any;
  }>;
  test?: (arg0: ExpectFn, arg1: CurrencyBridge) => any;
};
export type DatasetTest<T extends Transaction> = {
  implementations: string[];
  currencies:
    | Record<CryptoCurrencyIds, CurrenciesData<T>>
    | Record<string, never>;
};