subnets

type Allower interface {
	// IsAllowed filters out nodes that are not allowed to connect to this subnet
	IsAllowed(nodeID ids.NodeID, isValidator bool) bool
}

type Config struct {
	// ValidatorOnly indicates that this Subnet's Chains are available to only subnet validators.
	// No chain related messages will go out to non-validators.
	// Validators will drop messages received from non-validators.
	// Also see [AllowedNodes] to allow non-validators to connect to this Subnet.
	ValidatorOnly bool `json:"validatorOnly" yaml:"validatorOnly"`
	// AllowedNodes is the set of node IDs that are explicitly allowed to connect to this Subnet when
	// ValidatorOnly is enabled.
	AllowedNodes        set.Set[ids.NodeID] `json:"allowedNodes"        yaml:"allowedNodes"`
	ConsensusParameters config.Parameters   `json:"consensusParameters" yaml:"consensusParameters"`

	// ProposerMinBlockDelay is the minimum delay this node will enforce when
	// building a chain++ block.
	//
	// TODO: Remove this flag once all VMs throttle their own block production.
	ProposerMinBlockDelay time.Duration `json:"proposerMinBlockDelay" yaml:"proposerMinBlockDelay"`
	// ProposerNumHistoricalBlocks is the number of historical chain++ blocks
	// this node will index per chain. If set to 0, the node will index all
	// chain++ blocks.
	//
	// Note: The last accepted block is not considered a historical block. This
	// prevents the user from only storing the last accepted block, which can
	// never be safe due to the non-atomic commits between the proposervm
	// database and the innerVM's database.
	//
	// Invariant: This value must be set such that the proposervm never needs to
	// rollback more blocks than have been deleted. On startup, the proposervm
	// rolls back its accepted chain to match the innerVM's accepted chain. If
	// the innerVM is not persisting its last accepted block quickly enough, the
	// database can become corrupted.
	//
	// TODO: Move this flag once the proposervm is configurable on a per-chain
	// basis.
	ProposerNumHistoricalBlocks uint64 `json:"proposerNumHistoricalBlocks" yaml:"proposerNumHistoricalBlocks"`

	// POA Mode Configuration
	POAEnabled        bool          `json:"poaEnabled"         yaml:"poaEnabled"`        // Enable Proof of Authority mode
	POASingleNodeMode bool          `json:"poaSingleNodeMode"  yaml:"poaSingleNodeMode"` // Enable single node validation (K=1)
	POAMinBlockTime   time.Duration `json:"poaMinBlockTime"    yaml:"poaMinBlockTime"`   // Minimum time between blocks in POA mode
}

type Subnet interface {
	core.BootstrapTracker

	// AddChain adds a chain to this Subnet
	AddChain(chainID ids.ID) bool

	// Bootstrapped marks a chain as bootstrapped
	Bootstrapped(chainID ids.ID)

	// Config returns config of this Subnet
	Config() Config

	Allower

	// AllBootstrapped returns a channel that is closed when all chains have finished bootstrapping
	AllBootstrapped() <-chan struct{}
}