Finding all obligations in spl-token-lending program

If an Obligation becomes unhealthy, it can be liquidated by calling LiquidateObligation instruction, however, I cannot liquidate it if I don't know it exists, and the process of finding them is still unclear to me.

What is the expected way for me to find all currently "working" Obligations?

Solution

The only way to get all of the Obligation accounts is to use the getProgramAccounts RPC endpoint with a filter, which fetches every account owned by the lending program that has a certain size. Since an Obligation has a size of 916 according to the code: https://github.com/solana-labs/solana-program-library/blob/9123a80a6a5b5f8a378a56c4501f99df7debda55/token-lending/program/src/state/obligation.rs#L329, you can do:

curl YOUR_RPC_ENDPOINT_HERE -X POST -H "Content-Type: application/json" -d '
  {
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getProgramAccounts",
    "params": [
      "LENDING_PROGRAM_PUBKEY_IN_BASE_58",
      {
        "filters": [
          {
            "dataSize": 916
          }
        ]
      }
    ]
  }
'

This was adapated from https://docs.solana.com/developing/clients/jsonrpc-api#example-35