A library that makes it VERY easy to run Holochain as a library, from your own binary, with great defaults
You can find this crate on crates.io: https://crates.io/crates/embedded_holochain_runner
datastore_path
is most important. If existing persisted Holochain conductor files
are found in the given directory, it will simply re-use the admin_ws_port
app_ws_port
app_id
and dnas
from that configuration. Otherwise, it will create that directory, and setup your configuration as specified.
It will pair nicely with structopt to make a configurable service. See a simple demo. For a more advanced application using the exported async_main
function, shutdown signal, and StateSignal
listeners, you can see it in use in the Acorn Holochain application.
In either case,
- first run/installation
- second run/reboot
it will log this to the console when the interfaces are all ready and the app installed or running:
EMBEDDED_HOLOCHAIN_IS_READY
Cargo.toml
[dependencies]
embedded_holochain_runner = "0.0.103"
[patch.crates-io]
rkv = { git = "https://github.com/holochain/rkv.git", branch = "master" }
lmdb-rkv = { git = "https://github.com/holochain/lmdb-rs.git" }
Assuming you have a compiled Holochain DNA file sitting around at ../dna/sample/sample.dna
...
main.rs
use embedded_holochain_runner::*;
const SAMPLE_DNA: &'static [u8] = include_bytes!("../dna/sample/sample.dna");
fn main() {
// String is like "CellNick"/"SlotId"
let dnas: Vec<(Vec<u8>, String)> = vec![(SAMPLE_DNA.into(), "sample".into())];
blocking_main(HcConfig {
datastore_path: String::from("databases"),
keystore_path: String::from("keystore"),
app_id: String::from("my-app-id"),
dnas,
admin_ws_port: 1234,
app_ws_port: 8888,
proxy_url: String::from("kitsune-proxy://SYVd4CF3BdJ4DS7KwLLgeU3_DbHoZ34Y-qroZ79DOs8/kitsune-quic/h/165.22.32.11/p/5779/--"),
event_channel: None,
})
}
It will clearly log its configuration to the console.
RUST_LOG environment variable can be set to get details logs from Holochain. Those logs are by default suppressed.
if you pass an event_channel
, which should be of type: Option<tokio::sync::mpsc::Sender<StateSignal>>
where StateSignal
can be imported via use embedded_holochain_runner::StateSignal
, you can listen for the following events, to trigger external actions.
It looks like:
pub enum StateSignal {
// will be only one or the other of these
IsFirstRun,
IsNotFirstRun,
// are sub events after IsFirstRun
CreatingKeys,
RegisteringDna,
InstallingApp,
EnablingApp,
AddingAppInterface,
// Done/Ready Event, called when websocket interfaces and
// everything else is ready
IsReady,
}
This library is currently pointed at the https://bootstrap-staging.holo.host
node discovery service.
The HDK used for your DNA should match the version used in this library, which is listed below. Such as:
Zome Cargo.toml
[dependencies]
# use whatever hdk uses
serde = "*"
hdk = "0.0.109"
Currently bundles Holochain version: 0.0.109 (October 6, 2021).