jam-std-common 0.1.26

use crate::{
	AvailabilityStatement, Block, BoundedString, EpochIndex, ErasureRoot, PeerAddr, PeerDetails,
	PeerId, ReportGuarantee, TicketId, WorkReport,
};
use bounded_collections::{BoundedVec, ConstU32, TryCollect};
use codec::{Decode, Encode, MaxEncodedLen};
use jam_types::{
	CoreCount, CoreIndex, FixedVec, Hash, HeaderHash, ImportSpec, MaxDependencies,
	MaxImportSegments, MaxImports, MaxWorkItems, ProtocolParameters, SegmentTreeRoot, ServiceId,
	Slot, TicketAttempt, TicketsAttemptsNumber, UnsignedGas, ValIndex, WorkItem, WorkPackageHash,
	WorkReportHash, JAM_COMMON_ERA, VALS_PER_CORE,
};
use std::{
	ops::AddAssign,
	time::{Duration, SystemTime, UNIX_EPOCH},
};

/// Telemetry protocol version, should be incremented when the protocol changes.
pub const PROTOCOL_VERSION: u8 = 0;

pub type Reason = BoundedString<128>;

/// Microseconds since the beginning of the Jam "Common Era".
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Encode, Decode, MaxEncodedLen)]
pub struct Timestamp(pub u64);

impl Timestamp {
	pub fn now() -> Self {
		Self::from(SystemTime::now())
	}
}

impl std::fmt::Debug for Timestamp {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		self.0.fmt(f)
	}
}

impl From<SystemTime> for Timestamp {
	fn from(time: SystemTime) -> Self {
		let jam_ce = UNIX_EPOCH + Duration::from_secs(JAM_COMMON_ERA);
		let since_jam_ce = time.duration_since(jam_ce).unwrap_or(Duration::ZERO);
		Self(since_jam_ce.as_micros() as u64)
	}
}

impl From<Timestamp> for SystemTime {
	fn from(timestamp: Timestamp) -> Self {
		let jam_ce = UNIX_EPOCH + Duration::from_secs(JAM_COMMON_ERA);
		jam_ce + Duration::from_micros(timestamp.0)
	}
}

/// Each event sent over a connection is implicitly given an ID:
///
/// - The first event is given ID 0.
/// - The event immediately following an event E is given the ID of event E plus N, where N is the
///   number of dropped events if E is a "dropped" event, or 1 otherwise.
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Encode, Decode, MaxEncodedLen)]
pub struct EventId(pub u64);

impl std::fmt::Debug for EventId {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		self.0.fmt(f)
	}
}

impl std::fmt::Display for EventId {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		self.0.fmt(f)
	}
}

#[repr(u8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Encode, Decode, MaxEncodedLen)]
pub enum ConnectionSide {
	Local = 0,
	Remote = 1,
}

pub type ShardIndex = u16;

#[derive(Clone, Debug, Encode, Decode, MaxEncodedLen)]
pub struct BlockOutline {
	/// Size in bytes.
	pub size: u32,
	pub hash: HeaderHash,
	pub num_tickets: u32,
	pub num_preimages: u32,
	/// Total size of preimages in bytes.
	pub preimages_size: u32,
	pub num_guarantees: u32,
	pub num_assurances: u32,
	pub num_dispute_verdicts: u32,
}

impl From<(&Block, HeaderHash)> for BlockOutline {
	fn from((block, hash): (&Block, HeaderHash)) -> Self {
		Self {
			size: block.encoded_size() as u32,
			hash,
			num_tickets: block.extrinsic.tickets.len() as u32,
			num_preimages: block.extrinsic.preimages.len() as u32,
			preimages_size: block.extrinsic.preimages.iter().map(|p| p.blob.len() as u32).sum(),
			num_guarantees: block.extrinsic.guarantees.len() as u32,
			num_assurances: block.extrinsic.assurances.len() as u32,
			num_dispute_verdicts: block.extrinsic.disputes.verdicts.len() as u32,
		}
	}
}

impl From<&Block> for BlockOutline {
	fn from(block: &Block) -> Self {
		(block, block.header.hash()).into()
	}
}

#[repr(u8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Encode, Decode, MaxEncodedLen)]
pub enum BlockRequestDirection {
	AscendingExclusive = 0,
	DescendingInclusive = 1,
}

#[derive(Clone, Debug, Default, Encode, Decode, MaxEncodedLen)]
pub struct ExecCost {
	pub gas: UnsignedGas,
	/// Elapsed wall-clock time in nanoseconds.
	pub ns: u64,
}

impl AddAssign for ExecCost {
	fn add_assign(&mut self, rhs: Self) {
		self.gas += rhs.gas;
		self.ns += rhs.ns;
	}
}

#[derive(Clone, Debug, Default, Encode, Decode, MaxEncodedLen)]
pub struct IsAuthorizedCost {
	pub total: ExecCost,
	/// Time taken to load and compile the code, in nanoseconds.
	///
	/// Note that this is included in `total.ns`.
	pub load_ns: u64,
	/// Total cost of host calls.
	pub host_call: ExecCost,
}

impl AddAssign for IsAuthorizedCost {
	fn add_assign(&mut self, rhs: Self) {
		self.total += rhs.total;
		self.host_call += rhs.host_call;
	}
}

#[derive(Clone, Debug, Default, Encode, Decode, MaxEncodedLen)]
pub struct RefineHostCallCost {
	/// Total cost of `historical_lookup` calls.
	pub lookup: ExecCost,
	/// Total cost of `machine`/`expunge` calls.
	pub vm: ExecCost,
	/// Total cost of `peek`/`poke`/`pages` calls.
	pub mem: ExecCost,
	/// Total cost of `invoke` calls.
	pub invoke: ExecCost,
	/// Total cost of all other host calls.
	pub other: ExecCost,
}

impl AddAssign for RefineHostCallCost {
	fn add_assign(&mut self, rhs: Self) {
		self.lookup += rhs.lookup;
		self.vm += rhs.vm;
		self.mem += rhs.mem;
		self.invoke += rhs.invoke;
		self.other += rhs.other;
	}
}

#[derive(Clone, Debug, Default, Encode, Decode, MaxEncodedLen)]
pub struct RefineCost {
	pub total: ExecCost,
	/// Time taken to load and compile the code, in nanoseconds.
	///
	/// Note that this is included in `total.ns`.
	pub load_ns: u64,
	pub host_call: RefineHostCallCost,
}

impl AddAssign for RefineCost {
	fn add_assign(&mut self, rhs: Self) {
		self.total += rhs.total;
		self.host_call += rhs.host_call;
	}
}

pub type RefineCosts = BoundedVec<RefineCost, MaxWorkItems>;

#[derive(Clone, Debug, Default, Encode, Decode, MaxEncodedLen)]
pub struct AccumulateHostCallCost {
	/// Total cost of `read`/`write` calls.
	pub state: ExecCost,
	/// Total cost of `lookup` calls.
	pub lookup: ExecCost,
	/// Total cost of `query`/`solicit`/`forget`/`provide` calls.
	pub preimage: ExecCost,
	/// Total cost of `info`/`new`/`upgrade`/`eject` calls.
	pub service: ExecCost,
	/// Total cost of `transfer` calls.
	pub transfer: ExecCost,
	/// Total gas charged for transfer processing by destination services.
	pub transfer_dest_gas: UnsignedGas,
	/// Total cost of all other host calls.
	pub other: ExecCost,
}

impl AddAssign for AccumulateHostCallCost {
	fn add_assign(&mut self, rhs: Self) {
		self.state += rhs.state;
		self.lookup += rhs.lookup;
		self.preimage += rhs.preimage;
		self.service += rhs.service;
		self.transfer += rhs.transfer;
		self.transfer_dest_gas += rhs.transfer_dest_gas;
		self.other += rhs.other;
	}
}

#[derive(Clone, Debug, Default, Encode, Decode, MaxEncodedLen)]
pub struct AccumulateCost {
	/// Number of `accumulate` calls.
	pub num_calls: u32,
	/// Number of transfers processed.
	pub num_transfers: u32,
	/// Number of work items accumulated.
	pub num_items: u32,
	pub total: ExecCost,
	/// Time taken to load and compile the code, in nanoseconds.
	///
	/// Note that this is included in `total.ns`.
	pub load_ns: u64,
	pub host_call: AccumulateHostCallCost,
}

impl AddAssign for AccumulateCost {
	fn add_assign(&mut self, rhs: Self) {
		self.num_calls += rhs.num_calls;
		self.num_transfers += rhs.num_transfers;
		self.num_items += rhs.num_items;
		self.total += rhs.total;
		self.host_call += rhs.host_call;
	}
}

pub type AccumulateCosts = BoundedVec<(ServiceId, AccumulateCost), ConstU32<500>>;

/// Identifies a segment needed by a work-package.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum ImportSegmentId {
	/// The segment with the given index in the overall list of imports.
	Import(u16),
	/// The proof page for the segment with the given index in the overall list of imports.
	ProofPage(u16),
}

impl ImportSegmentId {
	pub fn import(self) -> Option<u16> {
		match self {
			Self::Import(index) => Some(index),
			Self::ProofPage(_) => None,
		}
	}
}

impl Encode for ImportSegmentId {
	fn size_hint(&self) -> usize {
		2
	}

	fn encode_to<O: codec::Output + ?Sized>(&self, output: &mut O) {
		let index = match *self {
			Self::Import(index) => {
				debug_assert!(index < (1 << 15));
				index
			},
			Self::ProofPage(index) => {
				debug_assert!(index < (1 << 15));
				index + (1 << 15)
			},
		};
		index.encode_to(output);
	}
}

impl Decode for ImportSegmentId {
	fn decode<I: codec::Input>(input: &mut I) -> Result<Self, codec::Error> {
		let index = u16::decode(input)?;
		if (index & (1 << 15)) == 0 {
			Ok(Self::Import(index))
		} else {
			Ok(Self::ProofPage(index & !(1 << 15)))
		}
	}

	fn encoded_fixed_size() -> Option<usize> {
		u16::encoded_fixed_size()
	}
}

impl MaxEncodedLen for ImportSegmentId {
	fn max_encoded_len() -> usize {
		u16::max_encoded_len()
	}
}

#[derive(Clone, Debug, Encode, Decode, MaxEncodedLen)]
pub struct WorkItemOutline {
	pub service: ServiceId,
	pub payload_size: u32,
	pub refine_gas_limit: UnsignedGas,
	pub accumulate_gas_limit: UnsignedGas,
	/// Sum of extrinsic lengths.
	pub extrinsic_size: u32,
	pub imports: BoundedVec<ImportSpec, MaxImports>,
	pub num_exports: u16,
}

impl From<&WorkItem> for WorkItemOutline {
	fn from(item: &WorkItem) -> Self {
		Self {
			service: item.service,
			payload_size: item.payload.len() as u32,
			refine_gas_limit: item.refine_gas_limit,
			accumulate_gas_limit: item.accumulate_gas_limit,
			extrinsic_size: item.extrinsic_size(),
			imports: item.import_segments.clone(),
			num_exports: item.export_count,
		}
	}
}

#[derive(Clone, Debug, Encode, Decode, MaxEncodedLen)]
pub struct WorkPackageOutline {
	/// Size in bytes, excluding extrinsic data.
	pub size: u32,
	pub hash: WorkPackageHash,
	pub anchor: HeaderHash,
	pub lookup_anchor_slot: Slot,
	pub prerequisites: BoundedVec<WorkPackageHash, MaxDependencies>,
	pub items: BoundedVec<WorkItemOutline, MaxWorkItems>,
}

#[derive(Clone, Debug, Encode, Decode, MaxEncodedLen)]
pub struct WorkReportOutline {
	pub hash: WorkReportHash,
	/// Size of bundle in bytes.
	pub bundle_size: u32,
	pub erasure_root: ErasureRoot,
	pub exports_root: SegmentTreeRoot,
}

impl From<&WorkReport> for WorkReportOutline {
	fn from(report: &WorkReport) -> Self {
		Self {
			hash: report.hash(),
			bundle_size: report.package_spec.len,
			erasure_root: report.package_spec.erasure_root,
			exports_root: report.package_spec.exports_root,
		}
	}
}

#[derive(Clone, Debug, Encode, Decode, MaxEncodedLen)]
pub struct GuaranteeOutline {
	pub report_hash: WorkReportHash,
	pub slot: Slot,
	pub guarantors: BoundedVec<ValIndex, ConstU32<{ VALS_PER_CORE as u32 }>>,
}

impl From<&ReportGuarantee> for GuaranteeOutline {
	fn from(guarantee: &ReportGuarantee) -> Self {
		Self {
			report_hash: guarantee.report.hash(),
			slot: guarantee.slot,
			guarantors: guarantee
				.signatures
				.iter()
				.map(|signature| signature.val_index)
				.try_collect()
				.expect("Output and input bounds are the same"),
		}
	}
}

#[repr(u8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Encode, Decode, MaxEncodedLen)]
pub enum GuaranteeDiscardReason {
	PackageReportedOnChain = 0,
	Superseded = 1,
	CannotReportOnChain = 2,
	TooMany = 3,
	Other = 4,
}

#[repr(u8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Encode, Decode, MaxEncodedLen)]
pub enum ReconstructionKind {
	/// A non-trivial reconstruction, involving at least some recovery shards.
	NonTrivial,
	/// A trivial reconstruction, using only original-data shards.
	Trivial,
}

#[repr(u8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Encode, Decode, MaxEncodedLen)]
pub enum AnnouncedPreimageForgetReason {
	ProvidedOnChain = 0,
	NotRequestedOnChain = 1,
	FailedToAcquire = 2,
	TooMany = 3,
	BadLength = 4,
	Other = 5,
}

#[repr(u8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Encode, Decode, MaxEncodedLen)]
pub enum PreimageDiscardReason {
	ProvidedOnChain = 0,
	NotRequestedOnChain = 1,
	TooMany = 2,
	Other = 3,
}

/// `NodeInfo` flag indicating that the node uses a PVM recompiler rather than an interpreter.
pub const NODE_USES_PVM_RECOMPILER: u32 = 1 << 0;

#[derive(Clone, Debug, Encode, Decode, MaxEncodedLen)]
pub struct NodeInfo {
	/// Protocol parameters the node is using.
	pub params: ProtocolParameters,
	/// Genesis header hash.
	pub genesis: HeaderHash,
	/// Peer ID and external address of the node.
	pub details: PeerDetails,
	pub flags: u32,
	/// Name of the node implementation, eg "PolkaJam".
	pub impl_name: BoundedString<32>,
	/// Version of the node implementation, eg "1.0".
	pub impl_version: BoundedString<32>,
	/// Gray Paper version implemented by the node, eg "0.7.1".
	pub gp_version: BoundedString<16>,
	/// Freeform note with additional information about the node.
	pub note: BoundedString<512>,
}

macro_rules! event_struct {
	($(#[$attr:meta])* $name:ident { $($(#[$field_attr:meta])* $field_name:ident: $field_type:ty,)+ }) => {
		$(#[$attr])*
		#[derive(Clone, Debug, Encode, Decode, MaxEncodedLen)]
		pub struct $name {
			$($(#[$field_attr])* pub $field_name: $field_type,)+
		}
	};
}

macro_rules! events {
	($($(#[$attr:meta])* $name:ident = $discriminator:literal $fields:tt)+) => {
		pub mod event {
			use super::*;
			$(event_struct! { $(#[$attr])* $name $fields })+
		}

		#[repr(u8)]
		#[derive(Clone, Encode, Decode, MaxEncodedLen)]
		pub enum Event {
			$($name(event::$name) = $discriminator,)+
		}

		impl std::fmt::Debug for Event {
			fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
				match self {
					$(Self::$name(event) => event.fmt(f),)+
				}
			}
		}
	};
}

events! {
	Dropped = 0 {
		/// Timestamp of the last dropped event.
		last_timestamp: Timestamp,
		/// Number of dropped events.
		num: u64,
	}

	Status = 10 {
		/// Total number of peers.
		num_peers: u32,
		/// Number of validator peers.
		num_val_peers: u32,
		/// Number of peers with a block announcement stream open.
		num_sync_peers: u32,
		/// Number of guarantees in pool, by core.
		num_guarantees: FixedVec<u8, CoreCount>,
		/// Number of shards in availability store.
		num_shards: u32,
		/// Total size of shards in availability store, in bytes.
		shards_size: u64,
		/// Number of preimages in the pool, ready to be included in a block.
		num_preimages: u32,
		/// Total size of preimages in the pool, in bytes.
		preimages_size: u32,
	}

	BestBlockChanged = 11 {
		slot: Slot,
		hash: HeaderHash,
	}

	FinalizedBlockChanged = 12 {
		slot: Slot,
		hash: HeaderHash,
	}

	SyncStatusChanged = 13 {
		synced: bool,
	}

	ConnectionRefused = 20 {
		from: PeerAddr,
	}

	ConnectingIn = 21 {
		from: PeerAddr,
	}

	ConnectInFailed = 22 {
		connecting_id: EventId,
		reason: Reason,
	}

	ConnectedIn = 23 {
		connecting_id: EventId,
		peer_id: PeerId,
	}

	ConnectingOut = 24 {
		to: PeerDetails,
	}

	ConnectOutFailed = 25 {
		connecting_id: EventId,
		reason: Reason,
	}

	ConnectedOut = 26 {
		connecting_id: EventId,
	}

	Disconnected = 27 {
		peer: PeerId,
		/// Which side terminated the connection? May be `None` in case of eg timeout.
		terminator: Option<ConnectionSide>,
		reason: Reason,
	}

	PeerMisbehaved = 28 {
		peer: PeerId,
		reason: Reason,
	}

	Authoring = 40 {
		slot: Slot,
		parent: HeaderHash,
	}

	AuthoringFailed = 41 {
		authoring_id: EventId,
		reason: Reason,
	}

	Authored = 42 {
		authoring_id: EventId,
		outline: BlockOutline,
	}

	Importing = 43 {
		slot: Slot,
		outline: BlockOutline,
	}

	BlockVerificationFailed = 44 {
		importing_id: EventId,
		reason: Reason,
	}

	BlockVerified = 45 {
		importing_id: EventId,
	}

	BlockExecutionFailed = 46 {
		authoring_or_importing_id: EventId,
		reason: Reason,
	}

	BlockExecuted = 47 {
		authoring_or_importing_id: EventId,
		accumulate_costs: AccumulateCosts,
	}

	BlockAnnouncementStreamOpened = 60 {
		peer: PeerId,
		/// Which side opened the stream?
		opener: ConnectionSide,
	}

	BlockAnnouncementStreamClosed = 61 {
		peer: PeerId,
		/// Which side closed the stream?
		closer: ConnectionSide,
		reason: Reason,
	}

	BlockAnnounced = 62 {
		peer: PeerId,
		/// Which side announced the block?
		announcer: ConnectionSide,
		slot: Slot,
		hash: HeaderHash,
	}

	SendingBlockRequest = 63 {
		recipient: PeerId,
		hash: HeaderHash,
		direction: BlockRequestDirection,
		max_blocks: u32,
	}

	ReceivingBlockRequest = 64 {
		sender: PeerId,
	}

	BlockRequestFailed = 65 {
		/// ID of the corresponding `SendingBlockRequest` or `ReceivingBlockRequest` event.
		request_id: EventId,
		reason: Reason,
	}

	BlockRequestSent = 66 {
		/// ID of the corresponding `SendingBlockRequest`.
		request_id: EventId,
	}

	BlockRequestReceived = 67 {
		/// ID of the corresponding `ReceivingBlockRequest`.
		request_id: EventId,
		hash: HeaderHash,
		direction: BlockRequestDirection,
		max_blocks: u32,
	}

	BlockTransferred = 68 {
		/// ID of the corresponding `SendingBlockRequest` or `ReceivingBlockRequest` event.
		request_id: EventId,
		slot: Slot,
		outline: BlockOutline,
		/// Was this the last block for the request?
		last: bool,
	}

	GeneratingTickets = 80 {
		epoch: EpochIndex,
	}

	TicketGenerationFailed = 81 {
		/// ID of the corresponding `GeneratingTickets` event.
		generating_id: EventId,
		reason: Reason,
	}

	TicketsGenerated = 82 {
		/// ID of the corresponding `GeneratingTickets` event.
		generating_id: EventId,
		/// VRF outputs.
		ids: BoundedVec<TicketId, TicketsAttemptsNumber>,
	}

	TicketTransferFailed = 83 {
		peer: PeerId,
		/// Which side tried to send a ticket?
		sender: ConnectionSide,
		/// Was this a transfer from the proxy to a potential block author? If `false`, this was a
		/// transfer from the ticket creator to the proxy.
		from_proxy: bool,
		reason: Reason,
	}

	TicketTransferred = 84 {
		peer: PeerId,
		/// Which side sent a ticket?
		sender: ConnectionSide,
		/// Was this a transfer from the proxy to a potential block author? If `false`, this was a
		/// transfer from the ticket creator to the proxy.
		from_proxy: bool,
		/// The epoch the ticket is to be used in.
		epoch: EpochIndex,
		/// Ticket attempt number.
		attempt: TicketAttempt,
		/// VRF output.
		id: TicketId,
	}

	WorkPackageSubmission = 90 {
		builder: PeerId,
		bundle: bool,
	}

	WorkPackageBeingShared = 91 {
		primary: PeerId,
	}

	WorkPackageFailed = 92 {
		/// ID of the corresponding `WorkPackageSubmission` or `WorkPackageBeingShared` event.
		submission_or_share_id: EventId,
		reason: Reason,
	}

	DuplicateWorkPackage = 93 {
		/// ID of the corresponding `WorkPackageSubmission` or `WorkPackageBeingShared` event.
		submission_or_share_id: EventId,
		core: CoreIndex,
		hash: WorkPackageHash,
	}

	WorkPackageReceived = 94 {
		/// ID of the corresponding `WorkPackageSubmission` or `WorkPackageBeingShared` event.
		submission_or_share_id: EventId,
		core: CoreIndex,
		outline: WorkPackageOutline,
	}

	Authorized = 95 {
		/// ID of the corresponding `WorkPackageSubmission` or `WorkPackageBeingShared` event.
		submission_or_share_id: EventId,
		cost: IsAuthorizedCost,
	}

	ExtrinsicDataReceived = 96 {
		/// ID of the corresponding `WorkPackageSubmission` or `WorkPackageBeingShared` event.
		submission_or_share_id: EventId,
	}

	ImportsReceived = 97 {
		/// ID of the corresponding `WorkPackageSubmission` or `WorkPackageBeingShared` event.
		submission_or_share_id: EventId,
	}

	SharingWorkPackage = 98 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		secondary: PeerId,
	}

	WorkPackageSharingFailed = 99 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		secondary: PeerId,
		reason: Reason,
	}

	BundleSent = 100 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		secondary: PeerId,
	}

	Refined = 101 {
		/// ID of the corresponding `WorkPackageSubmission` or `WorkPackageBeingShared` event.
		submission_or_share_id: EventId,
		/// Cost of `refine` call for each work item.
		costs: RefineCosts,
	}

	WorkReportBuilt = 102 {
		/// ID of the corresponding `WorkPackageSubmission` or `WorkPackageBeingShared` event.
		submission_or_share_id: EventId,
		outline: WorkReportOutline,
	}

	WorkReportSignatureSent = 103 {
		/// ID of the corresponding `WorkPackageBeingShared` event.
		share_id: EventId,
	}

	WorkReportSignatureReceived = 104 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		secondary: PeerId,
	}

	GuaranteeBuilt = 105 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		outline: GuaranteeOutline,
	}

	SendingGuarantee = 106 {
		/// ID of the corresponding `GuaranteeBuilt` event.
		built_id: EventId,
		recipient: PeerId,
	}

	GuaranteeSendFailed = 107 {
		sending_id: EventId,
		reason: Reason,
	}

	GuaranteeSent = 108 {
		sending_id: EventId,
	}

	GuaranteesDistributed = 109 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
	}

	ReceivingGuarantee = 110 {
		sender: PeerId,
	}

	GuaranteeReceiveFailed = 111 {
		receiving_id: EventId,
		reason: Reason,
	}

	GuaranteeReceived = 112 {
		receiving_id: EventId,
		outline: GuaranteeOutline,
	}

	GuaranteeDiscarded = 113 {
		outline: GuaranteeOutline,
		reason: GuaranteeDiscardReason,
	}

	SendingShardRequest = 120 {
		guarantor: PeerId,
		erasure_root: ErasureRoot,
		shard: ShardIndex,
	}

	ReceivingShardRequest = 121 {
		assurer: PeerId,
	}

	ShardRequestFailed = 122 {
		/// ID of the corresponding `SendingShardRequest` or `ReceivingShardRequest` event.
		request_id: EventId,
		reason: Reason,
	}

	ShardRequestSent = 123 {
		/// ID of the corresponding `SendingShardRequest`.
		request_id: EventId,
	}

	ShardRequestReceived = 124 {
		/// ID of the corresponding `ReceivingShardRequest`.
		request_id: EventId,
		erasure_root: ErasureRoot,
		shard: ShardIndex,
	}

	ShardsTransferred = 125 {
		/// ID of the corresponding `SendingShardRequest` or `ReceivingShardRequest` event.
		request_id: EventId,
	}

	DistributingAssurance = 126 {
		statement: AvailabilityStatement,
	}

	AssuranceSendFailed = 127 {
		/// ID of the corresponding `DistributingAssurance` event.
		distributing_id: EventId,
		recipient: PeerId,
		reason: Reason,
	}

	AssuranceSent = 128 {
		/// ID of the corresponding `DistributingAssurance` event.
		distributing_id: EventId,
		recipient: PeerId,
	}

	AssuranceDistributed = 129 {
		/// ID of the corresponding `DistributingAssurance` event.
		distributing_id: EventId,
	}

	AssuranceReceiveFailed = 130 {
		sender: PeerId,
		reason: Reason,
	}

	AssuranceReceived = 131 {
		sender: PeerId,
		/// Assurance anchor.
		anchor: HeaderHash,
	}

	SendingBundleShardRequest = 140 {
		audit_id: EventId,
		assurer: PeerId,
		shard: ShardIndex,
	}

	ReceivingBundleShardRequest = 141 {
		auditor: PeerId,
	}

	BundleShardRequestFailed = 142 {
		/// ID of the corresponding `SendingBundleShardRequest` or `ReceivingBundleShardRequest`
		/// event.
		request_id: EventId,
		reason: Reason,
	}

	BundleShardRequestSent = 143 {
		/// ID of the corresponding `SendingBundleShardRequest`.
		request_id: EventId,
	}

	BundleShardRequestReceived = 144 {
		/// ID of the corresponding `ReceivingBundleShardRequest`.
		request_id: EventId,
		erasure_root: ErasureRoot,
		shard: ShardIndex,
	}

	BundleShardTransferred = 145 {
		/// ID of the corresponding `SendingBundleShardRequest` or `ReceivingBundleShardRequest`
		/// event.
		request_id: EventId,
	}

	ReconstructingBundle = 146 {
		audit_id: EventId,
		kind: ReconstructionKind,
	}

	BundleReconstructed = 147 {
		audit_id: EventId,
	}

	SendingBundleRequest = 148 {
		audit_id: EventId,
		guarantor: PeerId,
	}

	ReceivingBundleRequest = 149 {
		auditor: PeerId,
	}

	BundleRequestFailed = 150 {
		/// ID of the corresponding `SendingBundleRequest` or `ReceivingBundleRequest` event.
		request_id: EventId,
		reason: Reason,
	}

	BundleRequestSent = 151 {
		/// ID of the corresponding `SendingBundleRequest` event.
		request_id: EventId,
	}

	BundleRequestReceived = 152 {
		/// ID of the corresponding `ReceivingBundleRequest` event.
		request_id: EventId,
		erasure_root: ErasureRoot,
	}

	BundleTransferred = 153 {
		/// ID of the corresponding `SendingBundleRequest` or `ReceivingBundleRequest` event.
		request_id: EventId,
	}

	WorkPackageHashMapped = 160 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		work_package_hash: WorkPackageHash,
		segments_root: SegmentTreeRoot,
	}

	SegmentsRootMapped = 161 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		segments_root: SegmentTreeRoot,
		erasure_root: ErasureRoot,
	}

	SendingSegmentShardRequest = 162 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		assurer: PeerId,
		/// Are proofs of the segment shards being requested?
		proofs: bool,
		/// Segment shards being requested.
		shards: BoundedVec<(ImportSegmentId, ShardIndex), MaxImportSegments>,
	}

	ReceivingSegmentShardRequest = 163 {
		sender: PeerId,
		/// Have proofs of the segment shards been requested?
		proofs: bool,
	}

	SegmentShardRequestFailed = 164 {
		/// ID of the corresponding `SendingSegmentShardRequest` or `ReceivingSegmentShardRequest`
		/// event.
		request_id: EventId,
		reason: Reason,
	}

	SegmentShardRequestSent = 165 {
		/// ID of the corresponding `SendingSegmentShardRequest` event.
		request_id: EventId,
	}

	SegmentShardRequestReceived = 166 {
		/// ID of the corresponding `ReceivingSegmentShardRequest` event.
		request_id: EventId,
		/// Number of segment shards requested.
		num: u16,
	}

	SegmentShardsTransferred = 167 {
		/// ID of the corresponding `SendingSegmentShardRequest` or `ReceivingSegmentShardRequest`
		/// event.
		request_id: EventId,
	}

	ReconstructingSegments = 168 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		segments: BoundedVec<ImportSegmentId, MaxImportSegments>,
		kind: ReconstructionKind,
	}

	SegmentReconstructionFailed = 169 {
		/// ID of the corresponding `ReconstructingSegments` event.
		reconstructing_id: EventId,
		reason: Reason,
	}

	SegmentsReconstructed = 170 {
		/// ID of the corresponding `ReconstructingSegments` event.
		reconstructing_id: EventId,
	}

	SegmentVerificationFailed = 171 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		segments: BoundedVec<u16, MaxImports>,
		reason: Reason,
	}

	SegmentsVerified = 172 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		segments: BoundedVec<u16, MaxImports>,
	}

	SendingSegmentRequest = 173 {
		/// ID of the corresponding `WorkPackageSubmission` event.
		submission_id: EventId,
		prev_guarantor: PeerId,
		segments: BoundedVec<u16, MaxImportSegments>,
	}

	ReceivingSegmentRequest = 174 {
		guarantor: PeerId,
	}

	SegmentRequestFailed = 175 {
		/// ID of the corresponding `SendingSegmentRequest` or `ReceivingSegmentRequest` event.
		request_id: EventId,
		reason: Reason,
	}

	SegmentRequestSent = 176 {
		/// ID of the corresponding `SendingSegmentRequest` event.
		request_id: EventId,
	}

	SegmentRequestReceived = 177 {
		/// ID of the corresponding `ReceivingSegmentRequest` event.
		request_id: EventId,
		/// Number of segments requested.
		num: u16,
	}

	SegmentsTransferred = 178 {
		/// ID of the corresponding `SendingSegmentRequest` or `ReceivingSegmentRequest` event.
		request_id: EventId,
	}

	PreimageAnnouncementFailed = 190 {
		peer: PeerId,
		/// Which side tried to announce a preimage?
		announcer: ConnectionSide,
		reason: Reason,
	}

	PreimageAnnounced = 191 {
		peer: PeerId,
		/// Which side announced a preimage?
		announcer: ConnectionSide,
		/// ID of requesting service.
		service: ServiceId,
		hash: Hash,
		length: u32,
	}

	AnnouncedPreimageForgotten = 192 {
		service: ServiceId,
		hash: Hash,
		length: u32,
		reason: AnnouncedPreimageForgetReason,
	}

	SendingPreimageRequest = 193 {
		recipient: PeerId,
		hash: Hash,
	}

	ReceivingPreimageRequest = 194 {
		sender: PeerId,
	}

	PreimageRequestFailed = 195 {
		/// ID of the corresponding `SendingPreimageRequest` or `ReceivingPreimageRequest` event.
		request_id: EventId,
		reason: Reason,
	}

	PreimageRequestSent = 196 {
		/// ID of the corresponding `SendingPreimageRequest`.
		request_id: EventId,
	}

	PreimageRequestReceived = 197 {
		/// ID of the corresponding `ReceivingPreimageRequest`.
		request_id: EventId,
		hash: Hash,
	}

	PreimageTransferred = 198 {
		/// ID of the corresponding `SendingPreimageRequest` or `ReceivingPreimageRequest` event.
		request_id: EventId,
		length: u32,
	}

	PreimageDiscarded = 199 {
		hash: Hash,
		length: u32,
		reason: PreimageDiscardReason,
	}
}

impl Event {
	/// Returns the ID of the following event.
	///
	/// `id` should be the ID of this event.
	pub fn next_id(&self, id: EventId) -> EventId {
		let inc = match self {
			Self::Dropped(dropped) => dropped.num,
			_ => 1,
		};
		EventId(id.0 + inc)
	}
}

#[derive(Clone, Debug, Encode, Decode, MaxEncodedLen)]
pub struct TimestampedEvent {
	pub timestamp: Timestamp,
	pub event: Event,
}