231 lines
8.4 KiB
Nim
231 lines
8.4 KiB
Nim
# Nimbus
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# Copyright (c) 2021 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed
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# except according to those terms.
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import
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std/hashes,
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eth/[common, p2p],
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stew/[interval_set, keyed_queue, sorted_set],
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../../db/select_backend,
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../sync_desc,
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./worker/com/com_error,
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./worker/db/[snapdb_desc, snapdb_pivot],
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./worker/ticker,
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./range_desc
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{.push raises: [Defect].}
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type
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SnapAccountsList* = SortedSet[NodeTag,Hash256]
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## Sorted pair of `(account,state-root)` entries
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SnapSlotsQueue* = KeyedQueue[Hash256,SnapSlotsQueueItemRef]
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## Handles list of storage slots data for fetch indexed by storage root.
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##
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## Typically, storage data requests cover the full storage slots trie. If
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## there is only a partial list of slots to fetch, the queue entry is
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## stored left-most for easy access.
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SnapSlotsQueuePair* = KeyedQueuePair[Hash256,SnapSlotsQueueItemRef]
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## Key-value return code from `SnapSlotsQueue` handler
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SnapSlotsQueueItemRef* = ref object
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## Storage slots request data. This entry is similar to `AccountSlotsHeader`
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## where the optional `subRange` interval has been replaced by an interval
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## range + healing support.
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accKey*: NodeKey ## Owner account
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slots*: SnapRangeBatchRef ## slots to fetch, nil => all slots
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SnapTodoRanges* = array[2,NodeTagRangeSet]
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## Pair of sets of ``unprocessed`` node ranges that need to be fetched and
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## integrated. The ranges in the first set must be handled with priority.
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##
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## This data structure is used for coordinating peers that run quasi
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## parallel.
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SnapRangeBatchRef* = ref object
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## `NodeTag` ranges to fetch, healing support
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unprocessed*: SnapTodoRanges ## Range of slots to be fetched
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processed*: NodeTagRangeSet ## Node ranges definitely processed
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SnapPivotRef* = ref object
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## Per-state root cache for particular snap data environment
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stateHeader*: BlockHeader ## Pivot state, containg state root
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# Accounts download coverage
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fetchAccounts*: SnapRangeBatchRef ## Set of accounts ranges to fetch
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# Storage slots download
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fetchStorageFull*: SnapSlotsQueue ## Fetch storage trie for these accounts
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fetchStoragePart*: SnapSlotsQueue ## Partial storage trie to com[plete
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parkedStorage*: HashSet[NodeKey] ## Storage batch items in use
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storageDone*: bool ## Done with storage, block sync next
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# Info
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nAccounts*: uint64 ## Imported # of accounts
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nSlotLists*: uint64 ## Imported # of account storage tries
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# Mothballing, ready to be swapped into newer pivot record
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storageAccounts*: SnapAccountsList ## Accounts with missing stortage slots
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archived*: bool ## Not latest pivot, anymore
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SnapPivotTable* = KeyedQueue[Hash256,SnapPivotRef]
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## LRU table, indexed by state root
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SnapRecoveryRef* = ref object
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## Recovery context
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state*: SnapDbPivotRegistry ## Saved recovery context state
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level*: int ## top level is zero
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BuddyData* = object
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## Per-worker local descriptor data extension
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errors*: ComErrorStatsRef ## For error handling
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pivotEnv*: SnapPivotRef ## Environment containing state root
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CtxData* = object
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## Globally shared data extension
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rng*: ref HmacDrbgContext ## Random generator
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dbBackend*: ChainDB ## Low level DB driver access (if any)
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snapDb*: SnapDbRef ## Accounts snapshot DB
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# Pivot table
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pivotTable*: SnapPivotTable ## Per state root environment
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beaconNumber*: BlockNumber ## Running on beacon chain
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beaconHash*: Hash256 ## Ditto
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coveredAccounts*: NodeTagRangeSet ## Derived from all available accounts
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covAccTimesFull*: uint ## # of 100% coverages
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recovery*: SnapRecoveryRef ## Current recovery checkpoint/context
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noRecovery*: bool ## Ignore recovery checkpoints
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# Info
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ticker*: TickerRef ## Ticker, logger
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SnapBuddyRef* = BuddyRef[CtxData,BuddyData]
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## Extended worker peer descriptor
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SnapCtxRef* = CtxRef[CtxData]
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## Extended global descriptor
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc hash*(a: SnapSlotsQueueItemRef): Hash =
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## Table/KeyedQueue mixin
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cast[pointer](a).hash
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proc hash*(a: Hash256): Hash =
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## Table/KeyedQueue mixin
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a.data.hash
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# ------------------------------------------------------------------------------
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# Public helpers: coverage
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# ------------------------------------------------------------------------------
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proc pivotAccountsCoverage*(ctx: SnapCtxRef): float =
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## Returns the accounts coverage factor
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ctx.data.coveredAccounts.fullFactor + ctx.data.covAccTimesFull.float
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proc pivotAccountsCoverage100PcRollOver*(ctx: SnapCtxRef) =
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## Roll over `coveredAccounts` registry when it reaches 100%.
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if ctx.data.coveredAccounts.isFull:
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# All of accounts hashes are covered by completed range fetch processes
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# for all pivot environments. So reset covering and record full-ness level.
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ctx.data.covAccTimesFull.inc
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ctx.data.coveredAccounts.clear()
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# ------------------------------------------------------------------------------
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# Public helpers: SnapTodoRanges
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# ------------------------------------------------------------------------------
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proc init*(q: var SnapTodoRanges) =
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## Populate node range sets with maximal range in the first range set. This
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## kind of pair or interval sets is managed as follows:
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## * As long as possible, fetch and merge back intervals on the first set.
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## * If the first set is empty and some intervals are to be fetched, swap
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## first and second interval lists.
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## That way, intervals from the first set are prioitised while the rest is
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## is considered after the prioitised intervals are exhausted.
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q[0] = NodeTagRangeSet.init()
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q[1] = NodeTagRangeSet.init()
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discard q[0].merge(low(NodeTag),high(NodeTag))
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proc clear*(q: var SnapTodoRanges) =
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## Reset argument range sets empty.
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q[0].clear()
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q[1].clear()
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proc merge*(q: var SnapTodoRanges; iv: NodeTagRange) =
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## Unconditionally merge the node range into the account ranges list.
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discard q[0].merge(iv)
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discard q[1].reduce(iv)
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proc merge*(q: var SnapTodoRanges; minPt, maxPt: NodeTag) =
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## Variant of `merge()`
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q.merge NodeTagRange.new(minPt, maxPt)
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proc reduce*(q: var SnapTodoRanges; iv: NodeTagRange) =
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## Unconditionally remove the node range from the account ranges list
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discard q[0].reduce(iv)
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discard q[1].reduce(iv)
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proc reduce*(q: var SnapTodoRanges; minPt, maxPt: NodeTag) =
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## Variant of `reduce()`
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q.reduce NodeTagRange.new(minPt, maxPt)
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iterator ivItems*(q: var SnapTodoRanges): NodeTagRange =
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## Iterator over all list entries
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for ivSet in q:
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for iv in ivSet.increasing:
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yield iv
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proc fetch*(q: var SnapTodoRanges; maxLen: UInt256): Result[NodeTagRange,void] =
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## Fetch interval from node ranges with maximal size `maxLen`
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# Swap batch queues if the first one is empty
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if q[0].isEmpty:
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swap(q[0], q[1])
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# Fetch from first range list
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let rc = q[0].ge()
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if rc.isErr:
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return err()
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let
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val = rc.value
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iv = if 0 < val.len and val.len <= maxLen: val # val.len==0 => 2^256
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else: NodeTagRange.new(val.minPt, val.minPt + (maxLen - 1.u256))
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discard q[0].reduce(iv)
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ok(iv)
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proc verify*(q: var SnapTodoRanges): bool =
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## Verify consistency, i.e. that the two sets of ranges have no overlap.
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if q[0].chunks == 0 or q[1].chunks == 0:
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# At least one set is empty
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return true
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# So neither set is empty
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if q[0].total == 0 or q[1].total == 0:
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# At least one set is maximal and the other non-empty
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return false
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# So neither set is empty, not full
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let (a,b) = if q[0].chunks < q[1].chunks: (0,1) else: (1,0)
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for iv in q[a].increasing:
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if 0 < q[b].covered(iv):
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return false
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true
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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