Solana Pusher

Running a Solana Pusher with Crossbar

You can use the same container for crossbar as a pusher service for your Solana feeds.

Getting Started

Step 1: Add your payer key to the environment

Using a pusher will require transactions to be made on-chain at a regular cadence. Thus, a well funded key must be passed into the environment.

SOLANA_PAYER_SECRET=<0xbase58SolanaSecret>

Step 2: Set the network

You have to pass in the Solana network you're targeting in order for the pusher to work.

# for mainnet
SOLANA_PUSHER_NETWORK=mainnet-beta

Step 3: Select a Min Compute Unit Price and Maximum Compute Unit Price (optional)

It's getting harder to land regular transactions on solana without priority fees - thus, Switchboard cranks use dynamic fees. Unfortunately, even dynamic fee calculators can drift from what's landing on-chain. It can be helpful to set a minimum fee (and a maximum fee for cost-savings).

# just an example (optional, but recommended)
SOLANA_MAX_CU_PRICE=100000
SOLANA_MIN_CU_PRICE=5000

Step 4: Mount the Feeds to `/solana-feeds.json`

In order to specify the feeds that the crank has access to, you'll need to mount a JSON file, solana-feeds.json to the root.

// solana-feeds.json example
[
    {
        "pubkey": "7QJ6e57t3yM8HYVg6bAnJiCiZ3wQQ5CSVsa6GA16nJuK"; // feed pubkey
        "interval": 60; // seconds 
        "network": "mainnet-beta"; // (optional) defaults to mainnet-beta
    },
    
    // feed 2...
]

Step 5: Boot it up:

As soon as you get this environment set up for Crossbar, it should start running. If you don't see explorer links working, try bumping the min compute unit price. Also, don't forget to use a non-rate-limited Solana rpc as this crank will constantly poll for feed updates.