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4: Node Power management

Date: 2023-01-26

Status

Accepted

Context

See here for more details.

Decision

Node Power State and Power target were added to pallet-tfgrid to orchestrate the Farmerbot taking actions to do power management. A farmer(bot) can choose to power down nodes by calling change_power_target(node_id, power_target(Up/Down)). When a node actually is going to shut down because of the changed power target, it will set it's power state to down on chain by calling change_power_state(PowerState(Up/Down)). Likewise, when the farmer(bot) changes back the power target of the node to Up, the node will change it's power state to up when it's fully booted again.

When creating contracts (rent/node) the power state is checked before the contract is created, thus preventing contracts to be created on Nodes that are shutdown physically.

Consequences

the good

  • Contracts (rent/node) cannot be created anymore on nodes that have power state Down
  • Power management is and opt-in feature with the farmerbot

the worrying

  • If the farmer(bot) sets a node's power target to Down and the node is in isolated network, the only way it can be turned on again is by setting the power target to Up and physically rebooting the node.