147 lines
4.5 KiB
Markdown
147 lines
4.5 KiB
Markdown
# ethapi-js
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A thin, fast, low-level Promise-based wrapper around the Ethereum APIs.
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[](https://travis-ci.org/jacogr/ethapi-js)
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[](https://coveralls.io/github/jacogr/ethapi-js?branch=master)
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[](https://david-dm.org/jacogr/ethapi-js)
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[](https://david-dm.org/jacogr/ethapi-js#info=devDependencies)
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## contributing
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Clone the repo and install dependencies via `npm install`. Tests can be executed via
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- `npm run testOnce` (100% covered unit tests)
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- `npm run testE2E` (E2E against a running RPC-enabled testnet Parity/Geth instance, `parity --testnet` and for WebScokets, `geth --testnet --ws --wsorigins '*' --rpc`)
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- setting the environment `DEBUG=true` will display the RPC POST bodies and responses on E2E tests
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## installation
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Install the package with `npm install --save ethapi-js` from the [npm registry ethapi-js](https://www.npmjs.com/package/ethapi-js)
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## usage
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### initialisation
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```javascript
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// import the actual EthApi class
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import EthApi from 'ethapi-js';
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// do the setup
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const transport = new EthApi.Transport.Http('http://localhost:8545'); // or .Ws('ws://localhost:8546')
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const ethapi = new EthApi(transport);
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```
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You will require native Promises and fetch support (latest browsers only), they can be utilised by
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```javascript
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import 'isomorphic-fetch';
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import es6Promise from 'es6-promise';
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es6Promise.polyfill();
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```
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### making calls
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perform a call
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```javascript
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ethapi.eth
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.coinbase()
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.then((coinbase) => {
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console.log(`The coinbase is ${coinbase}`);
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});
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```
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multiple promises
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```javascript
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Promise
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.all([
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ethapi.eth.coinbase(),
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ethapi.net.listening()
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])
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.then(([coinbase, listening]) => {
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// do stuff here
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});
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```
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chaining promises
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```javascript
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ethapi.eth
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.newFilter({...})
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.then((filterId) => ethapi.eth.getFilterChanges(filterId))
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.then((changes) => {
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console.log(changes);
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});
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```
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### contracts
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attach contract
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```javascript
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const abi = [{ name: 'callMe', inputs: [{ type: 'bool', ...}, { type: 'string', ...}]}, ...abi...];
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const contract = new ethapi.newContract(abi);
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```
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deploy
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```javascript
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contract
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.deploy('0xc0de', [params], 'superPassword')
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.then((address) => {
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console.log(`the contract was deployed at ${address}`);
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});
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```
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attach a contract at address
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```javascript
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// via the constructor & .at function
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const contract = api.newContract(abi).at('0xa9280...7347b');
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// or on an already initialised contract
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contract.at('0xa9280...7347b');
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// perform calls here
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```
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find & call a function
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```javascript
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contract.named
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.callMe
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.call({ gas: 21000 }, [true, 'someString']) // or estimateGas or sendTransaction
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.then((result) => {
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console.log(`the result was ${result}`);
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});
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```
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parse events from transaction receipt
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```javascript
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contract
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.parseTransactionEvents(txReceipt)
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.then((receipt) => {
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receipt.logs.forEach((log) => {
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console.log('log parameters', log.params);
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});
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});
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```
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## apis
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APIs implement the calls as exposed in the [Ethcore JSON Ethereum RPC](https://github.com/paritytech/ethereum-rpc-json/) definitions. Mapping follows the naming conventions of the originals, i.e. `eth_call` becomes `eth.call`, `personal_accounts` becomes `personal.accounts`, etc.
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- [ethapi.db](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#db)
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- [ethapi.eth](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#eth)
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- [ethapi.parity](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#parity)
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- [ethapi.net](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#net)
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- [ethapi.personal](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#personal)
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- [ethapi.shh](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#shh)
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- [ethapi.signer](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#signer)
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- [ethapi.trace](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#trace)
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- [ethapi.web3](https://github.com/paritytech/ethereum-rpc-json/blob/master/interfaces.md#web3)
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As a verification step, all exposed interfaces are tested for existing and pointing to the correct endpoints by using the generated interfaces from the above repo.
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