goral09 / casper-node

CasperLabs node

casperlabs-node

This is the core application for the CasperLabs blockchain.

Running a validator node

To run a validator node with the default configuration:

cargo run --release -- validator

It is very likely that the configuration requires editing though, so typically one will want to generate a configuration file first, edit it and then run:

cargo run --release -- generate-config > mynode.toml
# ... edit mynode.toml
cargo run --release -- validator --config=mynode.toml

NOTE: If you want to run multiple instances on the same machine, ensure you modify the [storage.path] field of their configuration files to give each a unique path, or else instances will share database files.

Logging

Logging can be enabled by setting the environment variable RUST_LOG. This can be set to one of the following levels, from lowest priority to highest: trace, debug, info, warn, error:

RUST_LOG=info cargo run --release -- validator

If the environment variable is unset, it is equivalent to setting RUST_LOG=error.

Log message format

A typical log message will look like:

Jun 09 01:40:17.315 INFO  [casperlabs_node::components::api_server api_server.rs:127] starting HTTP server; server_addr=127.0.0.1:7777

This is comprised of the following parts:

• timestamp
• log level
• full module path (not to be confused with filesystem path) of the source of the message
• filename and line number of the source of the message
• message

Filtering log messages

RUST_LOG can be set to enable varying levels for different modules. Simply set it to a comma-separated list of module-path=level, where the module path is as shown above in the typical log message, with the end truncated to suit.

For example, to enable trace level logging for the small_network module in components, info level for all other modules in components, and warn level for the remaining codebase:

RUST_LOG=casperlabs_node::components::small=trace,casperlabs_node::comp=info,warn

Running a client

There is a minimal client which can be executed to store and retrieve Deploys on validator nodes.

The client targets the HTTP service of a validator node. This can be configured via the config file for the node, and the actual bound endpoint is displayed as an info-level log message just after node startup.

Put a Deploy

To create a new random Deploy and store it:

cargo run --release --bin=casperlabs-client -- put-deploy http://localhost:7777

On success, the hash identifying the Deploy is output as a 64 character hex-encoded string. The Deploy will be broadcast immediately to all interconnected validator nodes.

Get a Deploy

To retrieve that deploy from any node:

cargo run --release --bin=casperlabs-client -- get-deploy http://localhost:8888 a555b68c8fed43078db6022a3de83fce97c1d80caf070c3654f9526d149e8182

List stored Deploys

To get a list of all stored Deploys' hashes:

cargo run --release --bin=casperlabs-client -- list-deploys http://localhost:9999