create-gas-station.ktpl

# A Kadena gas station is nothing more than a KDA account controlled by a
# special guard. This transaction template constructs gas station
# safely...i.e. it calls rotate after creating the account to ensure that you
# will be able to rotate it's guard in the future if any of the gas station's
# limits need to be changed. The mk-guard lambda function makes the important
# parts of the guard DRY to minimize the chance of mistakes.
code: |-
  (let
    ((mk-guard (lambda (max-gas-price:decimal)
                (util.guards.guard-or
                  (keyset-ref-guard "ns-admin-keyset")
                  (util.guards1.guard-all
                    [ (create-user-guard (coin.gas-only))
                      (util.guards1.max-gas-price max-gas-price)
                      (util.guards1.max-gas-limit 500)
                    ]))
               )
     )
    )

    (coin.transfer-create
      "{{{funding-acct}}}"
      "{{{gas-station-name}}}"
      (mk-guard 0.0000000001)
      {{amount}})
    (coin.rotate
      "{{{gas-station-name}}}"
      (mk-guard 0.00000001))
  )
data:
meta:
  chainId: "{{chain}}"
  sender: "{{{funding-acct}}}"
  gasLimit: 2000
  gasPrice: 0.00000001
  ttl: 7200
networkId: "{{network}}"
signers:
  - public: "{{funding-key}}"
    caps:
      - name: "coin.TRANSFER"
        args: ["{{{funding-acct}}}", "{{{gas-station-name}}}", {{amount}}]
      - name: "coin.GAS"
        args: []
  - public: "{{owner-key}}"
    caps:
      - name: "coin.ROTATE"
        args: ["{{{gas-station-name}}}"]
type: exec