A client library and binary for interacting with the Casper network.
The client runs in one of several modes, each mode performing a single action. To see all available commands:
cargo run --release -- help
example output
```commandline Casper client 2.0.0 A client for interacting with the Casper network
USAGE: casper-client [SUBCOMMAND]
OPTIONS: -h, --help Print help information -V, --version Print version information
SUBCOMMANDS: put-deploy Create a deploy and send it to the network for execution make-deploy Create a deploy and output it to a file or stdout. As a file, the deploy can subsequently be signed by other parties using the 'sign-deploy' subcommand and then sent to the network for execution using the 'send-deploy' subcommand sign-deploy Read a previously-saved deploy from a file, cryptographically sign it, and output it to a file or stdout send-deploy Read a previously-saved deploy from a file and send it to the network for execution transfer Transfer funds between purses make-transfer Create a transfer deploy and output it to a file or stdout. As a file, the deploy can subsequently be signed by other parties using the 'sign-deploy' subcommand and then sent to the network for execution using the 'send-deploy' subcommand get-deploy Retrieve a deploy from the network get-block Retrieve a block from the network get-block-transfers Retrieve all transfers for a block from the network list-deploys Retrieve the list of all deploy hashes in a given block get-state-root-hash Retrieve a state root hash at a given block get-era-info Retrieve era information from the network query-global-state Retrieve a stored value from the network query-balance Retrieve a purse's balance from the network get-dictionary-item Retrieve a stored value from a dictionary get-account Retrieve account information from the network get-auction-info Retrieve the bids and validators as of either a specific block (by height or hash), or the most recently added block get-validator-changes Retrieve status changes of active validators get-peers Retrieve network identity and address of each of the specified node's peers get-node-status Retrieve status of the specified node get-chainspec Retrieve the chainspec of the network (to print the full TOML, run with '-vv') list-rpcs List all currently supported RPCs keygen Generate account key files in the given directory account-address Generate an account hash from a given public key generate-completion Generate a shell completion script help Print this message or the help of the given subcommand(s) ```
To get further info on any command, run help followed by the subcommand, e.g.
cargo run --release -- help keygen
example output
```commandline casper-client-keygen Generates account key files in the given directory. Creates ["secretkey.pem", "publickey.pem", "publickeyhex"]. "publickeyhex" contains the hex-encoded key's bytes with the hex-encoded algorithm tag prefixed
USAGE: casper-client keygen [FLAGS] [OPTIONS] [PATH]
FLAGS: -f, --force If this flag is passed, any existing output files will be overwritten. Without this flag, if any output file exists, no output files will be generated and the command will fail -h, --help Prints help information -V, --version Prints version information
OPTIONS:
-a, --algorithm
ARGS:
Some commands require the use of a secret key for signing data. To generate a secret and public key pair:
cargo run --release -- keygen $HOME/.client_keys
Many client commands require sending HTTP requests and receiving responses. To do this with a local node running on the
same machine, follow the instructions in
the nctl README to set up a local test
network.
Ensure the network has fully started before running client commands. This can be determined by running
nctl-view-node-peers and checking each node has connections to all others.
For client commands requiring a node address (specified via the --node-address or -n arg), the default value is
http://localhost:7777, which is the address for a real network node. The --node-address=http://localhost:11101
argument must be included for the address of the first node of a testnet started via nctl.
The testnet will be set up so that the nodes each have an initial balance of tokens in their main purses. Let's say we
want to create a new purse under the public key we just created (in the "Generate asymmetric signing keys" section). We
can do this by creating a new deploy which will transfer funds between two purses once executed. The simplest way to
achieve this is via the transfer subcommand.
First, set the contents of the public_key_hex file to a variable. We'll use this as the target account:
PUBLIC_KEY=$(cat $HOME/.client_keys/public_key_hex)
Then execute the transfer subcommand. We'll specify that we want to transfer 1,234,567 tokens from the main purse of
node 3, and that we'll pay a maximum of 10,000 tokens to execute this deploy:
cargo run --release -- transfer \
--node-address=http://localhost:11101 \
--secret-key=../casper-node/utils/nctl/assets/net-1/nodes/node-3/keys/secret_key.pem \
--amount=1234567 \
--target-account=$PUBLIC_KEY \
--chain-name=casper-net-1 \
--payment-amount=3000000000
example output
commandline
{
"jsonrpc": "2.0",
"result": {
"api_version": "1.0.0",
"deploy_hash": "c42210759368a07a1b1ff4f019f7e77e7c9eaf2961b8c9dfc4237ea2218246c9"
},
"id": 2564730065
}
The deploy_hash in the response is worth noting, as it can be used to identify this deploy.
To see information about a deploy sent to the network via transfer, put-deploy, or send-deploy, you can use
get-deploy, along with the deploy hash printed after executing one of these subcommands.
For example, to see if our previous transfer command generated a deploy which was executed by the network:
cargo run --release -- get-deploy --node-address=http://localhost:11101 c42210759368a07a1b1ff4f019f7e77e7c9eaf2961b8c9dfc4237ea2218246c9
example output
commandline
{
"jsonrpc": "2.0",
"result": {
"api_version": "1.0.0",
"deploy": {
"approvals": [
{
"signature": "0140850c4f74aaad24894ce2d0e3efb64f599633fad4e280f39529dbd062ab49ca6a1f0bd6f20a8cddeab68e95ae5ea416a5b2ae3a02a0bc7a714c2915106e1c09",
"signer": "015b7723f1d9499fa02bd17dfe4e1315cfe1660a071e27ab1f29d6ceb6e2abcd73"
}
],
"hash": "c42210759368a07a1b1ff4f019f7e77e7c9eaf2961b8c9dfc4237ea2218246c9",
"header": {
"account": "015b7723f1d9499fa02bd17dfe4e1315cfe1660a071e27ab1f29d6ceb6e2abcd73",
"body_hash": "c66f1040f8f2aeafee73b7c0811e00fd6eb63a6a5992d7cc0f967e14704dd35b",
"chain_name": "casper-net-1",
"dependencies": [],
"gas_price": 10,
"timestamp": "2020-10-15T13:23:45.355Z",
"ttl": "1h"
},
"payment": {
"ModuleBytes": {
"args": "0100000006000000616d6f756e740300000002102708",
"module_bytes": ""
}
},
"session": {
"Transfer": {
"args": "0200000006000000616d6f756e74040000000387d612080600000074617267657420000000018189fd2d42c36d951f9803e595795a3a0fc07aa999c88a28d286c7cbf338940f0320000000"
}
}
},
"execution_results": [
{
"block_hash": "80a09df67f45bfb290c8f36021daf2fb898587a48fa0e4f7c506202ae8f791b8",
"result": {
"cost": "0",
"effect": {
"operations": {
"account-hash-018189fd2d42c36d951f9803e595795a3a0fc07aa999c88a28d286c7cbf33894": "Write",
"hash-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db": "Write",
"hash-d46e35465520ef9f868be3f26eaded1585dd66ac410706bab4b7adf92bdf528a": "Read",
"hash-ea274222cc975e4daec2cced17a0270df7c282e865115d98f544a35877af5271": "Add",
"uref-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db-000": "Write",
"uref-8e7893be4b33bc5eacde4dd684b030593200364a211b8566ed9458ccbafbcde9-000": "Write",
"uref-b645152645faa6c3f7708fd362a118296f7f4d39dc065c120877d13b6981cd67-000": "Write"
},
"transforms": {
"account-hash-018189fd2d42c36d951f9803e595795a3a0fc07aa999c88a28d286c7cbf33894": "WriteAccount",
"hash-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db": {
"WriteCLValue": {
"bytes": "02b645152645faa6c3f7708fd362a118296f7f4d39dc065c120877d13b6981cd6707",
"cl_type": "Key"
}
},
"hash-d46e35465520ef9f868be3f26eaded1585dd66ac410706bab4b7adf92bdf528a": "Identity",
"hash-ea274222cc975e4daec2cced17a0270df7c282e865115d98f544a35877af5271": {
"AddKeys": {
"uref-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db-000": "uref-b645152645faa6c3f7708fd362a118296f7f4d39dc065c120877d13b6981cd67-007"
}
},
"uref-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db-000": {
"WriteCLValue": {
"bytes": "",
"cl_type": "Unit"
}
},
"uref-8e7893be4b33bc5eacde4dd684b030593200364a211b8566ed9458ccbafbcde9-000": {
"WriteCLValue": {
"bytes": "087929775d78456301",
"cl_type": "U512"
}
},
"uref-b645152645faa6c3f7708fd362a118296f7f4d39dc065c120877d13b6981cd67-000": {
"WriteCLValue": {
"bytes": "0387d612",
"cl_type": "U512"
}
}
}
},
"error_message": null
}
}
]
},
"id": 592430140
}
The block_hash in the response's execution_results is worth noting, as it can be used to identify the block in which
the deploy is included. If the deploy was successfully received and parsed by the node, but failed to execute, the
error_message in execution_results may provide useful information.
BlockTo see information about a Block created by the network, you can use get-block. For example:
cargo run --release -- get-block \
--node-address=http://localhost:11101 \
--block-hash=80a09df67f45bfb290c8f36021daf2fb898587a48fa0e4f7c506202ae8f791b8
example output
commandline
{
"jsonrpc": "2.0",
"result": {
"api_version": "1.0.0",
"block": {
"body": null,
"hash": "80a09df67f45bfb290c8f36021daf2fb898587a48fa0e4f7c506202ae8f791b8",
"header": {
"accumulated_seed": "e8c65524331dc950d9065c289deb05458d3f9d8beba15e663a5418f5a6c7bed5",
"body_hash": "0e5751c026e543b2e8ab2eb06099daa1d1e5df47778f7787faab45cdf12fe3a8",
"deploy_hashes": [
"c42210759368a07a1b1ff4f019f7e77e7c9eaf2961b8c9dfc4237ea2218246c9"
],
"era_end": null,
"era_id": 89,
"state_root_hash": "c79f4c9a017532fe265593d86d3917581479fd1601093e16d17ec90aeaa63b83",
"height": 987,
"parent_hash": "ffb95eac42eae1112d37797a1ecc67860e88a9364c44845cb7a96eb426dca502",
"proposer": "015b7723f1d9499fa02bd17dfe4e1315cfe1660a071e27ab1f29d6ceb6e2abcd73",
"random_bit": true,
"timestamp": "2020-10-15T13:23:48.352Z"
},
"proofs": [
"0104df3fe39567d22a48b68c4b046dadf5af6552c45b1a93613c89a65caa98b12a4564ba1a794e77787eb3d37c19617ca344f2a304387a0364fee0e8f89da2da0d"
]
}
},
"id": 3484548969
}
The state_root_hash in the response's header is worth noting, as it can be used to identify the state root hash
for the purposes of querying the global state.
Transfers contained in a BlockTo retrieve all Transfer transactions processed in a Block created by the network, you can use get-block-transfers. For example:
cargo run --release -- get-block-transfers \
--node-address=http://localhost:11101 \
--block-hash=80a09df67f45bfb290c8f36021daf2fb898587a48fa0e4f7c506202ae8f791b8
example output
commandline
{
"jsonrpc": "2.0",
"result": {
"api_version": "1.0.0",
"block_hash": "80a09df67f45bfb290c8f36021daf2fb898587a48fa0e4f7c506202ae8f791b8",
"transfers": [
{
"amount": "100000000",
"deploy_hash": "ab87c5f2c0f6f331bf488703676fb0c68f897282dfbb8e085752f220a3dfc25e",
"from": "account-hash-1ace33e66142d5a0679ba5507ef75b9c09888d1567e86100d1db535fa819a962",
"gas": "0",
"id": null,
"source": "uref-21f7316e72d1baa7b706a9083077d643665ad3a56673c594db9762ceac4f3788-007",
"target": "uref-c5eb9788156b53c9a599dfb5e591c6399580b491c72086a6bc028dd18fdfcb2d-004"
}
]
},
"id": 7229488934468542904
}
To view data stored to global state after executing a deploy, you can use query-global-state. For example, to see the value
stored under our new account's public key:
cargo run --release -- query-global-state \
--node-address=http://localhost:11101 \
--state-root-hash=242666f5959e6a51b7a75c23264f3cb326eecd6bec6dbab147f5801ec23daed6 \
--key=$PUBLIC_KEY
example output
commandline
{
"jsonrpc": "2.0",
"result": {
"api_version": "1.0.0",
"stored_value": {
"Account": {
"account_hash": "018189fd2d42c36d951f9803e595795a3a0fc07aa999c88a28d286c7cbf33894",
"action_thresholds": {
"deployment": 1,
"key_management": 1
},
"associated_keys": [
{
"account_hash": "018189fd2d42c36d951f9803e595795a3a0fc07aa999c88a28d286c7cbf33894",
"weight": 1
}
],
"main_purse": "uref-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db-007",
"named_keys": {}
}
}
},
"id": 3649040235
}
This yields details of the newly-created account object, including the URef of the account's main purse.
This can be done via query-balance. For example, to get the balance of the main purse of our newly-created account:
cargo run --release -- query-balance \
--node-address=http://localhost:11101 \
--state-root-hash=242666f5959e6a51b7a75c23264f3cb326eecd6bec6dbab147f5801ec23daed6 \
--purse-identifier=account-hash-f7196ed0f4a4aa2aae02daa8f0bdad39ed3098c028979db4f96c3c25670a8240
example output
commandline
{
"jsonrpc": "2.0",
"result": {
"api_version": "1.0.0",
"balance_value": "1234567"
},
"id": 4193583276
}
Note that the system mint contract is required to retrieve the balance of any given purse. If you execute a
query-global-state specifying a purse URef as the --key argument, you'll find that the actual value stored there is a
unit value (). This makes the get-balance subcommand particularly useful.
The lib directory contains source for the client library, which may be called directly rather than through the CLI
binary. The CLI app casper-client makes use of this library to implement its functionality.
Licensed under the Apache License Version 2.0.