Golang New Examples

Example #1

File: etherapis.go Project: karalabe/etherapis

// New creates a new Ether APIs instance, connects with it to the Ethereum network
// via an embedded Geth instance and attaches an RPC in-process endpoint to it.
func New(datadir string, network geth.EthereumNetwork, address common.Address) (*EtherAPIs, error) {
	// Create a Geth instance and boot it up
	client, err := geth.New(datadir, network)
	if err != nil {
		return nil, err
	}
	if err := client.Start(); err != nil {
		return nil, err
	}
	// Retrieve the underlying ethereum service and attach global RPC interface
	var ethereum *eth.Ethereum
	if err := client.Stack().Service(&ethereum); err != nil {
		return nil, err
	}
	api, err := client.Attach()
	if err != nil {
		return nil, err
	}
	// Assemble an interface around the consensus contract
	contract, err := contract.New(ethereum.ChainDb(), ethereum.EventMux(), ethereum.BlockChain(), ethereum.Miner().PendingState)
	if err != nil {
		return nil, err
	}
	// Assemble and return the Ether APIs instance
	return &EtherAPIs{
		client:   client,
		ethereum: ethereum,
		eventmux: client.Stack().EventMux(),
		rpcapi:   api,
		contract: contract,
	}, nil
}

Example #2

File: etherapis.go Project: obscuren/etherapis

// New creates a new Ether APIs instance, connects with it to the Ethereum network
// via an embedded Geth instance and attaches an RPC in-process endpoint to it.
func New(datadir string, network geth.EthereumNetwork, address common.Address) (*EtherAPIs, error) {
	// Create a Geth instance and boot it up
	client, err := geth.New(datadir, network)
	if err != nil {
		return nil, err
	}
	if err := client.Start(); err != nil {
		return nil, err
	}
	// Retrieve the underlying ethereum service and attach global RPC interface
	var ethereum *eth.Ethereum
	if err := client.Stack().Service(&ethereum); err != nil {
		return nil, err
	}
	api, err := client.Attach()
	if err != nil {
		return nil, err
	}
	// Assemble an interface around the consensus contract
	rpcClient, err := client.Stack().Attach()
	if err != nil {
		return nil, err
	}
	contract, err := contract.NewEtherAPIs(address, backends.NewRPCBackend(rpcClient))
	if err != nil {
		return nil, err
	}
	// Assemble and return the Ether APIs instance
	return &EtherAPIs{
		client:   client,
		ethereum: ethereum,
		eventmux: client.Stack().EventMux(),
		rpcapi:   api,
		contract: contract,
		signer: func(from common.Address, tx *types.Transaction) (*types.Transaction, error) {
			signature, err := ethereum.AccountManager().Sign(accounts.Account{Address: from}, tx.SigHash().Bytes())
			if err != nil {
				return nil, err
			}
			return tx.WithSignature(signature)
		},
	}, nil
}