@cennznet/cli

cennz-cli

commandline tool to interact with cennznet

• Usage
• Commands
• API Cookbook
• Write your own script

Usage

$ npm install -g @cennznet/cli
$ cennz-cli COMMAND
running command...
$ cennz-cli (-v|--version|version)
@cennznet/cli/0.9.2 darwin-x64 node-v10.16.0
$ cennz-cli --help [COMMAND]
USAGE
  $ cennz-cli COMMAND
...

Commands

• cennz-cli api
• cennz-cli ext:connect CONNECTSTRING
• cennz-cli ext:sign EXTRINSICSTRING
• cennz-cli help [COMMAND]
• cennz-cli repl [SCRIPT]
• cennz-cli script:list
• cennz-cli script:run SCRIPT
• cennz-cli script:update
• cennz-cli wallet:add
• cennz-cli wallet:create
• cennz-cli wallet:generate
• cennz-cli wallet:list
• cennz-cli wallet:remove [ADDRESS]

cennz-cli api

Send transactions

USAGE
  $ cennz-cli api

OPTIONS
  -c, --endpoint=endpoint  [default: wss://rimu.unfrastructure.io/public/ws] cennznet node endpoint
  -f, --path=path          [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -m, --method=method      calling method
  -p, --passphrase         if a passphrase is needed
  -s, --section=section    section of transaction
  -t, --category=category  category of api call
  --help                   show CLI help
  --seed=seed              seed of sender key
  --sender=sender          address of sender

DESCRIPTION
  This command sends transactions from one user to another based on flags given to the command. eg:
     $ bin/cennz-cli api -t tx -s genericAsset -m transfer --seed="//Andrea" 16000 
  "5Gw3s7q4QLkSWwknsiPtjujPv3XM4Trxi5d4PgKMMk3gfGTE" 1234
     or sign with account in the wallet
     $ bin/cennz-cli api -t tx -s genericAsset -m transfer --sender='5G8fco8mAT3hkprXGRGDYxACZrDsy63y96PATPo4dKcvGmFF' 
  16000 "5Gw3s7q4QLkSWwknsiPtjujPv3XM4Trxi5d4PgKMMk3gfGTE" 1234

See code: src/commands/api.ts

cennz-cli ext:connect CONNECTSTRING

connect to single source extension

USAGE
  $ cennz-cli ext:connect CONNECTSTRING

ARGUMENTS
  CONNECTSTRING  The string that contains the encoded information of peer server

OPTIONS
  -f, --path=path   [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase  if a passphrase is needed

DESCRIPTION
  Please click the QR code on single source extension for four times to get the connectString

See code: src/commands/ext/connect.ts

cennz-cli ext:sign EXTRINSICSTRING

Sign an extrinsic from single source extension.

USAGE
  $ cennz-cli ext:sign EXTRINSICSTRING

ARGUMENTS
  EXTRINSICSTRING  The string that contains the encoded information of peer server and the information of the extrinsic

OPTIONS
  -e, --endpoint=endpoint  [default: wss://rimu.unfrastructure.io/public/ws] cennznet node endpoint
  -f, --path=path          [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase         if a passphrase is needed

DESCRIPTION
  Please click the QR code on single source extension for four times to get the extrinsicString

See code: src/commands/ext/sign.ts

cennz-cli help [COMMAND]

display help for cennz-cli

USAGE
  $ cennz-cli help [COMMAND]

ARGUMENTS
  COMMAND  command to show help for

OPTIONS
  --all  see all commands in CLI

See code: @oclif/plugin-help

cennz-cli repl [SCRIPT]

Start a repl to interact with a node

USAGE
  $ cennz-cli repl [SCRIPT]

ARGUMENTS
  SCRIPT  the path of JS file which will be evaluated into context

OPTIONS
  -c, --endpoint=endpoint  [default: ws://localhost:9944] cennznet node endpoint
  -e, --evaluate=evaluate  evaluate script and print result
  -f, --path=path          [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase         if a passphrase is needed

DESCRIPTION
  -------------
     1. Connect to a node by websocket:
     $ cennz-cli repl --endpoint="ws://localhost:9944 --passphrase='passphrase' --path='path for wallet vault'

     If no 'endpoint' flag, 'ws://localhost:9944' will be used as default.

     2. Optionally, like "node" cli, a expression or JS script could be provided:

     $ cennz-cli repl -p="toyKeyring.alice.address()"
     $ cennz-cli repl myScript.js

     The expression or script would be evaluated in the repl context, and the
     result would be printed. Note the interactive REPL would not be opened in this case.

     3. async/await is supported in repl enviroment, you can do:

     $ cennz-cli repl -p="const name = await api.rpc.system.chain()"
     [String: 'CENNZnet DEV']

     4. To load a file while in the repl enviroment, use `.load` command:

See code: src/commands/repl.ts

cennz-cli script:list

List all available scripts

USAGE
  $ cennz-cli script:list

See code: src/commands/script/list.ts

cennz-cli script:run SCRIPT

Run a script

USAGE
  $ cennz-cli script:run SCRIPT

OPTIONS
  -c, --endpoint=endpoint  [default: wss://rimu.unfrastructure.io/public/ws] cennznet node endpoint
  -f, --path=path          [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase         if a passphrase is needed
  --noApi                  pass true if the script doesn't need to connect to the network

See code: src/commands/script/run.ts

cennz-cli script:update

Pull changes of scripts from remote

USAGE
  $ cennz-cli script:update

OPTIONS
  --force  force checkout script repo

See code: src/commands/script/update.ts

cennz-cli wallet:add

add new account by either seedHex or seedText

USAGE
  $ cennz-cli wallet:add

OPTIONS
  -f, --path=path      [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase     if a passphrase is needed
  --seedHex=seedHex    seed in hex form (start with 0x)
  --seedText=seedText  seed as a simple text (Alice)

See code: src/commands/wallet/add.ts

cennz-cli wallet:create

Create a new wallet

USAGE
  $ cennz-cli wallet:create

OPTIONS
  -f, --path=path   [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase  if a passphrase is needed

See code: src/commands/wallet/create.ts

cennz-cli wallet:generate

generate a new account and store it in wallet

USAGE
  $ cennz-cli wallet:generate

OPTIONS
  -f, --path=path   [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase  if a passphrase is needed

See code: src/commands/wallet/generate.ts

cennz-cli wallet:list

list all accounts' address

USAGE
  $ cennz-cli wallet:list

OPTIONS
  -f, --path=path   [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase  if a passphrase is needed

See code: src/commands/wallet/list.ts

cennz-cli wallet:remove [ADDRESS]

remove the specified address from wallet

USAGE
  $ cennz-cli wallet:remove [ADDRESS]

OPTIONS
  -f, --path=path   [default: /Users/ian/.cennz_cli/wallet.json] path to wallet.json
  -p, --passphrase  if a passphrase is needed

See code: src/commands/wallet/remove.ts

cennz-cli wallet

USAGE
  $ cennz-cli wallet:COMMAND

COMMANDS
  wallet:add       add new account by either seedHex or seedText
  wallet:create    Create a new wallet
  wallet:generate  generate a new account and store it in wallet
  wallet:list      list all accounts' address
  wallet:remove    remove the specified address from wallet

Beyond NodeJS REPL

async/await is supported in repl environment by default:

$ (cennz-cli)> const name = await api.rpc.system.chain()
$ (cennz-cli)> name
[String: 'CENNZnet DEV']

The REPL context provided some global variables ready for use.

Keyrings

keyring is a Keyring instance for key pairs management. For instance, add a key from seed:

(cennz-cli)> const aliceSeed = util.stringToU8a('Alice'.padEnd(32, ' '))
(cennz-cli)> const aliceKey = keyring.addFromSeed(aliceSeed)
(cennz-cli)> aliceKey.toJson()
{ address: '5GoKvZWG5ZPYL1WUovuHW3zJBWBP5eT8CbqjdRY4Q6iMaDtZ',
  encoded:
   '0x3053020101300506032b657004220420416c696365202020202020202020202020202020202020202020202020202020a123032100d172a74cda4c865912c32ba0a80a57ae69abae410e5ccb59dee84e2f4432db4f',
  encoding: { content: 'pkcs8', type: 'none', version: '0' },
  meta: {} }

For most of the cases, use keyring to store your keys. If you want another keyring to manage a different group of keys, use Keyring to create one.

(cennz-cli)> const myKeyring = new Keyring()

Use toyKeyring to access common testing key pairs, incuding our "cryptography friends" Alice, Bob, Charlie, Dave, Eve, Ferdie, and also Andrea, Brooke, Courtney, Drew, Emily, Frank.

(cennz-cli)> toyKeyring.alice.address()
'5GoKvZWG5ZPYL1WUovuHW3zJBWBP5eT8CbqjdRY4Q6iMaDtZ'
(cennz-cli)> toyKeyring.andrea.toJson()
{ address: '5EKGZwAuwvVpVaGWZJ3hYDqTSxQCDDUgeMv36M4qLq7wtWLH',
  encoded:
   '0x3053020101300506032b657004220420416e647265612020202020202020202020202020202020202020202020202020a123032100639404ecb02a5069c62c17f755ae0473388ea9698c7475db58e77e5eed980a63',
  encoding: { content: 'pkcs8', type: 'none', version: '0' },
  meta: {} }

For more usage of Keyring, check @polkadot/keyring.

API Cookbook

On the REPL start, an websocket connection would be established to the endpoint provided by -e, --endpoint flag.

Use api in the REPL to interact with the node:

// check chain name
(cennz-cli)> api.rpc.system.chain().then(console.log)
(cennz-cli)> [String: 'CENNZnet DEV']
// get Alice's nonce
(cennz-cli)> api.query.system.accountNonce(toyKeyring.alice.address()).then(nonce => console.log(nonce.toJSON()))
Nonce {
  negative: 0,
  words: [ 0 ],
  length: 1,
  red: null,
  _bitLength: 64,
  _isHexJson: false }

Check @cennznet/api for more info.

Write your own script

Argv

argv the command line arguments

with test.js

console.log(argv)

$ cennz-cli repl test.js 1 2

will print

[ 'test.js', '1', '2' ]

Globals

api

see above

util

see @cennznet/util.

Build-in types.

(cennz-cli)> Hash
[Function: Hash]
(cennz-cli)> Gas
[Function: Gas]

loadWallet()

get user's local wallet

const wallet = await loadWallet();
api.setSignet(wallet);

Best Practice

• write script's own usage(). Check args required, print usage and exit(1) if any args is missing.