Send transactions to Ethereum contracts via JSON RPC API

2
votes

I'm playing around with geth and wanted to interacts with contracts through JSON RPC API. However, I'm confused because there is no place for input in the eth.sendTransaction API.

Per Ethereum Gitbook, eth.sendTransaction takes in params like this:

params: [{
  "from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
  "to": "0xd46e8dd67c5d32be8058bb8eb970870f072445675",
  "gas": "0x76c0", // 30400,
  "gasPrice": "0x9184e72a000", // 10000000000000
  "value": "0x9184e72a", // 2441406250
  "data": "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
}]

All these fields make sense but there is no place to specify the input. Using other tools, such as console and web apps, I can sendTransaction and noticed the TX takes a form like this:

> eth.getTransactionFromBlock(60)
{
  blockHash: "0xc386191621e45e170d50c1caacc9090b7117e09d0847c46f77f6a3c822ec5580",
  blockNumber: 60,
  from: "0xd9b56ae6e0f7a7e0e0dec74b685b2c7f3f543472",
  gas: 66666,
  gasPrice: 50000000000,
  hash: "0x28aa9e720e11f2f81490b6500a3a56c19ec77b936fc745d16c302387837f324e",
  input: "0xc6888fa10000000000000000000000000000000000000000000000000000000000000064",
  nonce: 6,
  to: "0x689495d3e1ff1b955bc4d0bde622bdb34dbb787b",
  transactionIndex: 0,
  value: 0
}

Note the there is an input field. So is it possible to send transaction via JSON RPC API? If so, which API should be used?

1
ethereum

1 Answers

2
votes

Transaction input is represented by data param of the eth_sendTransaction RPC message.