Moonchain publisher

Establishes connection with Moonchain blockchain node and publishes blockchain data to Synternet.

Prerequisits

• Go compiler (v1.21).
• Moonchain node with accessible IPC or access to RPC.
• Publishing credentials. Learn more on the Synternet Portal.

Usage

make dep
make build
./moonchain-publisher --ipc-path /var/lib/moonchain/geth.ipc --prefix synternet

Environment variables and flags

Environment variables can be passed to docker container. Flags can be passed as executable arguments.

Environment variable	Flag	Description
IPC_PATH	ipc-path	Moonchain node IPC path, e.g.: /tmp/geth.ipc
NATS_URLS	nats-urls	(optional) NATS connection URLs to Synternet brokers, e.g.: nats://e.f.g.h. URL to broker. Default: testnet.
NATS_NKEY	nats-nkey	NATS user NKEY, e.g.: SU..SI (58 chars). See here.
NATS_JWT	nats-jwt	NATS user JWT, e.g.: eyJ.... See here.
PUBLISHER_PREFIX	publisher-prefix	Stream prefix, usually your organisation, e.g.: synternet prefix results in synternet.moonchain.<tx,log-even,header,...> stream subjects. Stream prefix should be same as registered wallet alias.
PUBLISHER_NAME	publisher-name	(optional) Stream publisher infix, e.g.: foo infix results in prefix.foo.<tx,log-even,header,...> stream subjects. Stream publisher infix should be same as registered publisher alias. Default: moonchain.

Auth with NATS credentials

Synternet uses NATS authentication model. NATS has an accounts level with users belonging to those accounts. To publish user level NKEY and JWT have to be used, which are generated from account.

1. Acquire account level NKEY (in Synternet a.k.a. access token). See here.
2. Generate user level NATS_NKEY, NATS_JWT from account level NKEY. Can be generated using user generator.
3. Pass generated NATS_NKEY and NATS_JWT.

Docker

From source

docker build -t moonchain-publisher -f docker/Dockerfile .

Prebuilt image

docker run --rm --env-file=.env -v /tmp/moonchain.ipc:/tmp/ethereum.ipc ghcr.io/synternet/moonchain-publisher:latest