ganache-cli: A JavaScript repository from DEXON Foundation

NOTICE: testrpc is now ganache-cli. Use it just as you would testrpc.

Welcome to Ganache CLI

Ganache CLI, part of the Truffle suite of Ethereum development tools, is the command line version of Ganache, your personal blockchain for Ethereum development.

Ganache CLI uses ethereumjs to simulate full client behavior and make developing Ethereum applications faster, easier, and safer. It also includes all popular RPC functions and features (like events) and can be run deterministically to make development a breeze.

Looking for TestRPC?

If you came here expecting to find the TestRPC, you're in the right place! Truffle has taken the TestRPC under its wing and made it part of the Truffle suite of tools. From now on you can expect better support along with tons of new features that help make Ethereum development safer, easier, and more enjoyable. Use ganache-cli just as you would testrpc.

Installation

ganache-cli is written in Javascript and distributed as a Node package via npm. Make sure you have Node.js (>= v6.11.5) installed.

npm install -g @dexon-foundation/ganache-cli

ganache-cli utilizes ganache-core internally, which is distributed with optional native dependencies for increased performance. If these native dependencies fail to install on your system ganache-cli will automatically fallback to ganache-core’s pre-bundled JavaScript build.

Having problems? Be sure to check out the FAQ and if you're still having issues and you're sure its a problem with ganache-cli please open an issue.

Using Ganache CLI

Command Line

$ dexon-ganache-cli <options>

Options:

-a or --accounts: Specify the number of accounts to generate at startup.
-e or --defaultBalanceEther: Amount of ether to assign each test account. Default is 100.
-b or --blockTime: Specify blockTime in seconds for automatic mining. If you don't specify this flag, ganache will instantly mine a new block for every transaction. Using the --blockTime flag is discouraged unless you have tests which require a specific mining interval.
-d or --deterministic: Generate deterministic addresses based on a pre-defined mnemonic.
-n or --secure: Lock available accounts by default (good for third party transaction signing)
-m or --mnemonic: Use a bip39 mnemonic phrase for generating a PRNG seed, which is in turn used for hierarchical deterministic (HD) account generation.
-p or --port: Port number to listen on. Defaults to 8545.
-h or --host or --hostname: Hostname to listen on. Defaults to 127.0.0.1 (defaults to 0.0.0.0 for Docker instances of ganache-cli).
-s or --seed: Use arbitrary data to generate the HD wallet mnemonic to be used.
-g or --gasPrice: The price of gas in wei (defaults to 20000000000)
-l or --gasLimit: The block gas limit (defaults to 0x6691b7)
-f or --fork: Fork from another currently running Ethereum client at a given block. Input should be the HTTP location and port of the other client, e.g. http://localhost:8545. You can optionally specify the block to fork from using an @ sign: http://localhost:8545@1599200.
-i or --networkId: Specify the network id ganache-cli will use to identify itself (defaults to the current time or the network id of the forked blockchain if configured)
--db: Specify a path to a directory to save the chain database. If a database already exists, ganache-cli will initialize that chain instead of creating a new one.
--debug: Output VM opcodes for debugging
--mem: Output ganache-cli memory usage statistics. This replaces normal output.
-q or --quiet: Run ganache-cli without any logs.
-v or --verbose: Log all requests and responses to stdout
-? or --help: Display help information
--version: Display the version of ganache-cli
--noVMErrorsOnRPCResponse: Do not transmit transaction failures as RPC errors. Enable this flag for error reporting behaviour which is compatible with other clients such as geth and Parity.
--allowUnlimitedContractSize: Allows unlimited contract sizes while debugging. By enabling this flag, the check within the EVM for contract size limit of 24KB (see EIP-170) is bypassed. Enabling this flag will cause ganache-cli to behave differently than production environments.
--keepAliveTimeout: Sets the HTTP server's keepAliveTimeout in milliseconds. See the NodeJS HTTP docs for details. 5000 by default.
-t or --time: Date (ISO 8601) that the first block should start. Use this feature, along with the evm_increaseTime method to test time-dependent code.

Special Options:

--account: Specify --account=... (no 's') any number of times passing arbitrary private keys and their associated balances to generate initial addresses:
```
$ dexon-ganache-cli --account="<privatekey>,balance" [--account="<privatekey>,balance"]
```
Note that private keys are 64 characters long, and must be input as a 0x-prefixed hex string. Balance can either be input as an integer or 0x-prefixed hex value specifying the amount of wei in that account.

An HD wallet will not be created for you when using --account.
-u or --unlock: Specify --unlock ... any number of times passing either an address or an account index to unlock specific accounts. When used in conjunction with --secure, --unlock will override the locked state of specified accounts.
```
$ dexon-ganache-cli --secure --unlock "0x1234..." --unlock "0xabcd..."
```
You can also specify a number, unlocking accounts by their index:
```
$ dexon-ganache-cli --secure -u 0 -u 1
```
This feature can also be used to impersonate accounts and unlock addresses you wouldn't otherwise have access to. When used with the --fork feature, you can use ganache-cli to make transactions as any address on the blockchain, which is very useful for testing and dynamic analysis.

Library

As a Web3 provider:

var ganache = require("@dexon-foundation/ganache-cli");
web3.setProvider(ganache.provider());

As a general http server:

var ganache = require("@dexon-foundation/ganache-cli");
var server = ganache.server();
server.listen(port, function(err, blockchain) {...});

Both .provider() and .server() take a single object which allows you to specify behavior of ganache-cli. This parameter is optional. Available options are:

"accounts": Array of Object's. Each object should have a balance key with a hexadecimal value. The key secretKey can also be specified, which represents the account's private key. If no secretKey, the address is auto-generated with the given balance. If specified, the key is used to determine the account's address.
"debug": boolean - Output VM opcodes for debugging
"blockTime": number - Specify blockTime in seconds for automatic mining. If you don't specify this flag, ganache will instantly mine a new block for every transaction. Using the blockTime option is discouraged unless you have tests which require a specific mining interval.
"logger": Object - Object, like console, that implements a log() function.
"mnemonic": Use a specific HD wallet mnemonic to generate initial addresses.
"port": Port number to listen on when running as a server.
"seed": Use arbitrary data to generate the HD wallet mnemonic to be used.
"total_accounts": number - Number of accounts to generate at startup.
"fork": string - Same as --fork option above.
"network_id": integer - Same as --networkId option above.
"time": Date - Date that the first block should start. Use this feature, along with the evm_increaseTime method to test time-dependent code.
"locked": boolean - whether or not accounts are locked by default.
"unlocked_accounts": Array - array of addresses or address indexes specifying which accounts should be unlocked.
"db_path": String - Specify a path to a directory to save the chain database. If a database already exists, ganache-cli will initialize that chain instead of creating a new one.
"account_keys_path": String - Specifies a file to save accounts and private keys to, for testing.
"vmErrorsOnRPCResponse": boolean - Whether or not to transmit transaction failures as RPC errors. Set to false for error reporting behaviour which is compatible with other clients such as geth and Parity.
"allowUnlimitedContractSize": boolean - Allows unlimited contract sizes while debugging. By setting this to true, the check within the EVM for contract size limit of 24KB (see EIP-170) is bypassed. Setting this to true will cause ganache-core to behave differently than production environments. (default: false; ONLY set to true during debugging).
"keepAliveTimeout": Sets the HTTP server's keepAliveTimeout in milliseconds. See the NodeJS HTTP docs for details. 5000 by default.

Implemented Methods

The RPC methods currently implemented are:

bzz_hive (stub)
bzz_info (stub)
debug_traceTransaction
eth_accounts
eth_blockNumber
eth_call
eth_coinbase
eth_estimateGas
eth_gasPrice
eth_getBalance
eth_getBlockByNumber
eth_getBlockByHash
eth_getBlockTransactionCountByHash
eth_getBlockTransactionCountByNumber
eth_getCode (only supports block number “latest”)
eth_getCompilers
eth_getFilterChanges
eth_getFilterLogs
eth_getLogs
eth_getStorageAt
eth_getTransactionByHash
eth_getTransactionByBlockHashAndIndex
eth_getTransactionByBlockNumberAndIndex
eth_getTransactionCount
eth_getTransactionReceipt
eth_hashrate
eth_mining
eth_newBlockFilter
eth_newFilter (includes log/event filters)
eth_protocolVersion
eth_sendTransaction
eth_sendRawTransaction
eth_sign
eth_syncing
eth_uninstallFilter
net_listening
net_peerCount
net_version
miner_start
miner_stop
personal_listAccounts
personal_lockAccount
personal_newAccount
personal_unlockAccount
personal_sendTransaction
shh_version
rpc_modules
web3_clientVersion
web3_sha3

There’s also special non-standard methods that aren’t included within the original RPC specification:

evm_snapshot : Snapshot the state of the blockchain at the current block. Takes no parameters. Returns the integer id of the snapshot created.
evm_revert : Revert the state of the blockchain to a previous snapshot. Takes a single parameter, which is the snapshot id to revert to. If no snapshot id is passed it will revert to the latest snapshot. Returns true.
evm_increaseTime : Jump forward in time. Takes one parameter, which is the amount of time to increase in seconds. Returns the total time adjustment, in seconds.
evm_mine : Force a block to be mined. Takes one optional parameter, which is the timestamp a block should setup as the mining time. Mines a block independent of whether or not mining is started or stopped.

Unsupported Methods

eth_compileSolidity: If you'd like Solidity compilation in Javascript, please see the solc-js project.

Docker

The Simplest way to get started with the Docker image:

docker run -d -p 8545:8545 trufflesuite/ganache-cli:latest

To pass options to ganache-cli through Docker simply add the arguments to the run command:

docker run -d -p 8545:8545 trufflesuite/ganache-cli:latest -a 10 --debug

The Docker container adds an environment variable DOCKER=true; when this variable is set to true (case insensitive), ganache-cli use a default hostname IP of 0.0.0.0 instead of the normal default 127.0.0.1. You can still specify a custom hostname however:

docker run -d -p 8545:8545 trufflesuite/ganache-cli:latest -h XXX.XXX.XXX.XXX

To build the Docker container from source:

git clone https://github.com/trufflesuite/ganache-cli.git && cd ganache-cli
docker build -t trufflesuite/ganache-cli .

Contributing to Ganache CLI

The Ganache CLI repository contains the cli logic and Docker config/build only. It utilizes ganache-core, the core logic powering Ganache, internally.

You can contribute to the core code at ganache-core.