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Examples Using Plutus Application Backend (PAB)

Tracing of Emulated Execution

The following command runs a trace that includes creating, reading, writing, and deleting the oracle. A transcript of the output is in example.log.

mantra-oracle -- trace Êþ CORN FARM PIGY 1000000 0

Here CORN is the control token, FARM the datum token, and PIGY the fee token: these are assets under the cafe currency symbol. The minimum fee for using the oracle in a contract is 1000000 PIGY.

Simulation on Mock PAB

The PAB example uses three executables:

  1. First start the simulate Plutus application backend (PAB), and leave it running. Wait until three [INFO] Activated instance messages are printed before running the oracle in step #2: this lets enough slots pass to create the oracle and transfer newly minted funds to the other wallet(s). In this example, BRIO is the control token, SOFR the datum token, and PIGY the fee token: these are assets under the a newly created currency symbol. The minimum fee for using the oracle in a contract is 1000000 PIGY. Wallet #1, which controls the oracle, will be created with 0 PIGY and its Contract ID (CID) will be stored in the file oracle.cid; wallet #2 will have 2500000 PIGY and its CID stored in wallet-2.cid.

    mantra-oracle pab-simulate CORN FORM PIGY 1000000 0 '[(1, 0, "oracle.cid"), (2, 2500000, "wallet-2.cid")]'

  2. Next run the oracle data source, and leave this running. This periodically polls the data source and posts data when it changes. In this example, we poll the New York Federal Reserve Bank SOFR API every 300 seconds, connect to the PAB at 127.0.0.1:9080, and call the write endpoint for the Contract ID (CID) in the file oracle.cid.

    mantra-oracle/mantra-oracle pab-control 300 127.0.0.1 9080 oracle.cid

  3. Each time we want to use the oracle data in a bare-bones contract, we can run the following. In this example, we connect to the PAB at 127.0.0.1:8080 and call the read endpoint for the Contract ID (CID) in the file wallet-2.cid. If we call the end point more than twice, reading the oracle will fail due to insufficient funds.

    mantis-oracle pab-employ 127.0.0.1 9080 wallet-2.cid