Websockets improvements and fixes

[TonioMacaronio]

This fixes #188

• More convenience methods
• Fixed some errors
• No need to write delay between connection and subscribing

[barrasso]

Hey @BaldyAsh, I got the pending transactions socket working, and it lists ALL pending transactions.

Is there a specific method that will get pending transactions for ONE specific address?

I've already tried both of these:

try! socketProvider!.setFilterAndGetChanges(method: .newFilter, address: EthereumAddress(address)!, fromBlock: .earliest, toBlock: .latest, topics: nil)

try! socketProvider!.subscribeOnLogs(addresses: [EthereumAddress(address)!], topics: nil)

[TonioMacaronio]

Hi @barrasso . Seems it isn't possible with Infura. Its eth_newPendingTransactionFilter and newPendingTransactions subscription do not use additional parameters. Some contracts have logs that indicate that the contract had received some tx and you can use them to get txs notifications

[barrasso]

OK @BaldyAsh. Is there a way to get a balance update for a given address?

I see there is a way to get this with parity_subscribe like so:

// subscribe to eth_getBalance
>{"jsonrpc":"2.0", "id":1, "method":"parity_subscribe", "params":["eth_getBalance",["0x004702bdcC3C7dbFfd943136107E70B827028600", "latest"]]}

[TonioMacaronio]

@barrasso Infura supports parity_subscribe only on the Kovan network