TypeScript Web3Wrapper.getAvailableAddressesAsync方法代碼示例

    public async updateProviderToInjectedAsync() {
        utils.assert(!_.isUndefined(this._zeroEx), 'ZeroEx must be instantiated.');

        if (_.isUndefined(this._cachedProvider)) {
            return; // Going from injected to injected, so we noop
        }

        this._blockchainWatcher.destroy();

        const provider = this._cachedProvider;
        this.networkId = this._cachedProviderNetworkId;

        const shouldPollUserAddress = true;
        this._web3Wrapper = new Web3Wrapper(provider);
        this._blockchainWatcher = new BlockchainWatcher(
            this._dispatcher,
            this._web3Wrapper,
            this.networkId,
            shouldPollUserAddress,
        );

        const userAddresses = await this._web3Wrapper.getAvailableAddressesAsync();
        this._userAddressIfExists = userAddresses[0];

        this._zeroEx.setProvider(provider, this.networkId);

        await this.fetchTokenInformationAsync();
        this._blockchainWatcher.startEmittingNetworkConnectionAndUserBalanceState();
        this._dispatcher.updateProviderType(ProviderType.Injected);
        delete this._ledgerSubprovider;
        delete this._cachedProvider;
    }

 /**
  * Gets the address to use for sending a transaction.
  * @return The default from address. If not specified, returns the first address accessible by web3.
  */
 private async _getFromAddressAsync(): Promise<string> {
     let from: string;
     if (_.isUndefined(this._defaults.from)) {
         const accounts = await this.web3Wrapper.getAvailableAddressesAsync();
         from = accounts[0];
     } else {
         from = this._defaults.from;
     }
     return from;
 }

    private async _onPageLoadInitFireAndForgetAsync() {
        await utils.onPageLoadAsync(); // wait for page to load

        // Hack: We need to know the networkId the injectedWeb3 is connected to (if it is defined) in
        // order to properly instantiate the web3Wrapper. Since we must use the async call, we cannot
        // retrieve it from within the web3Wrapper constructor. This is and should remain the only
        // call to a web3 instance outside of web3Wrapper in the entire dapp.
        // In addition, if the user has an injectedWeb3 instance that is disconnected from a backing
        // Ethereum node, this call will throw. We need to handle this case gracefully
        const injectedWeb3 = (window as any).web3;
        let networkIdIfExists: number;
        if (!_.isUndefined(injectedWeb3)) {
            try {
                networkIdIfExists = _.parseInt(await promisify<string>(injectedWeb3.version.getNetwork)());
            } catch (err) {
                // Ignore error and proceed with networkId undefined
            }
        }

        const provider = await Blockchain._getProviderAsync(injectedWeb3, networkIdIfExists);
        this.networkId = !_.isUndefined(networkIdIfExists)
            ? networkIdIfExists
            : configs.IS_MAINNET_ENABLED ? constants.NETWORK_ID_MAINNET : constants.NETWORK_ID_KOVAN;
        this._dispatcher.updateNetworkId(this.networkId);
        const zeroExConfigs = {
            networkId: this.networkId,
        };
        this._zeroEx = new ZeroEx(provider, zeroExConfigs);
        this._updateProviderName(injectedWeb3);
        const shouldPollUserAddress = true;
        this._web3Wrapper = new Web3Wrapper(provider);
        this._blockchainWatcher = new BlockchainWatcher(
            this._dispatcher,
            this._web3Wrapper,
            this.networkId,
            shouldPollUserAddress,
        );

        const userAddresses = await this._web3Wrapper.getAvailableAddressesAsync();
        this._userAddressIfExists = userAddresses[0];
        this._dispatcher.updateUserAddress(this._userAddressIfExists);
        await this.fetchTokenInformationAsync();
        this._blockchainWatcher.startEmittingNetworkConnectionAndUserBalanceState();
        await this._rehydrateStoreWithContractEvents();
    }

            async () => {
                // Check for network state changes
                let currentNetworkId;
                try {
                    currentNetworkId = await this._web3Wrapper.getNetworkIdAsync();
                } catch (err) {
                    // Noop
                }
                if (currentNetworkId !== this._prevNetworkId) {
                    this._prevNetworkId = currentNetworkId;
                    this._dispatcher.updateNetworkId(currentNetworkId);
                }

                // Check for node version changes
                const currentNodeVersion = await this._web3Wrapper.getNodeVersionAsync();
                if (currentNodeVersion !== prevNodeVersion) {
                    prevNodeVersion = currentNodeVersion;
                    this._dispatcher.updateNodeVersion(currentNodeVersion);
                }

                if (this._shouldPollUserAddress) {
                    const addresses = await this._web3Wrapper.getAvailableAddressesAsync();
                    const userAddressIfExists = addresses[0];
                    // Update makerAddress on network change
                    if (this._prevUserAddressIfExists !== userAddressIfExists) {
                        this._prevUserAddressIfExists = userAddressIfExists;
                        this._dispatcher.updateUserAddress(userAddressIfExists);
                    }

                    // Check for user ether balance changes
                    if (!_.isUndefined(userAddressIfExists)) {
                        await this._updateUserWeiBalanceAsync(userAddressIfExists);
                    }
                } else {
                    // This logic is primarily for the Ledger, since we don't regularly poll for the address
                    // we simply update the balance for the last fetched address.
                    if (!_.isUndefined(this._prevUserAddressIfExists)) {
                        await this._updateUserWeiBalanceAsync(this._prevUserAddressIfExists);
                    }
                }
            },

export const runMigrationsAsync = async (deployer: Deployer) => {
    const web3Wrapper: Web3Wrapper = deployer.web3Wrapper;
    const accounts: string[] = await web3Wrapper.getAvailableAddressesAsync();

    const tokenTransferProxy = await deployer.deployAndSaveAsync(ContractName.TokenTransferProxy);
    const zrxToken = await deployer.deployAndSaveAsync(ContractName.ZRXToken);
    const etherToken = await deployer.deployAndSaveAsync(ContractName.EtherToken);
    const tokenReg = await deployer.deployAndSaveAsync(ContractName.TokenRegistry);

    const exchangeArgs = [zrxToken.address, tokenTransferProxy.address];
    const owners = [accounts[0], accounts[1]];
    const confirmationsRequired = new BigNumber(2);
    const secondsRequired = new BigNumber(0);
    const multiSigArgs = [owners, confirmationsRequired, secondsRequired, tokenTransferProxy.address];
    const exchange = await deployer.deployAndSaveAsync(ContractName.Exchange, exchangeArgs);
    const multiSig = await deployer.deployAndSaveAsync(
        ContractName.MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress,
        multiSigArgs,
    );

    const owner = accounts[0];
    await tokenTransferProxy.addAuthorizedAddress.sendTransactionAsync(exchange.address, { from: owner });
    await tokenTransferProxy.transferOwnership.sendTransactionAsync(multiSig.address, { from: owner });
    const addTokenGasEstimate = await tokenReg.addToken.estimateGasAsync(
        zrxToken.address,
        tokenInfo[0].name,
        tokenInfo[0].symbol,
        tokenInfo[0].decimals,
        tokenInfo[0].ipfsHash,
        tokenInfo[0].swarmHash,
        { from: owner },
    );
    await tokenReg.addToken.sendTransactionAsync(
        zrxToken.address,
        '0x Protocol Token',
        'ZRX',
        18,
        constants.NULL_BYTES,
        constants.NULL_BYTES,
        {
            from: owner,
            gas: addTokenGasEstimate,
        },
    );
    await tokenReg.addToken.sendTransactionAsync(
        etherToken.address,
        'Ether Token',
        'WETH',
        18,
        constants.NULL_BYTES,
        constants.NULL_BYTES,
        {
            from: owner,
            gas: addTokenGasEstimate,
        },
    );
    for (const token of tokenInfo) {
        const totalSupply = new BigNumber(0);
        const args = [token.name, token.symbol, token.decimals, totalSupply];
        const dummyToken = await deployer.deployAsync(ContractName.DummyToken, args);
        await tokenReg.addToken.sendTransactionAsync(
            dummyToken.address,
            token.name,
            token.symbol,
            token.decimals,
            token.ipfsHash,
            token.swarmHash,
            {
                from: owner,
                gas: addTokenGasEstimate,
            },
        );
    }
};