nim-codex/tests/contracts/helpers/mockprovider.nim

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import std/strutils
import std/tables
import pkg/ethers/provider
from codex/clock import SecondsSince1970
export provider.Block
type MockProvider* = ref object of Provider
blocks: OrderedTableRef[int, Block]
earliest: ?int
latest: ?int
method getBlock*(
provider: MockProvider,
tag: BlockTag
): Future[?Block] {.async.} =
if $tag == "latest":
if latestBlock =? provider.latest:
if provider.blocks.hasKey(latestBlock):
return provider.blocks[latestBlock].some
elif $tag == "earliest":
if earliestBlock =? provider.earliest:
if provider.blocks.hasKey(earliestBlock):
return provider.blocks[earliestBlock].some
else:
let blockNumber = parseHexInt($tag)
if provider.blocks.hasKey(blockNumber):
return provider.blocks[blockNumber].some
return Block.none
proc updateEarliestAndLatest(provider: MockProvider, blockNumber: int) =
if provider.earliest.isNone:
provider.earliest = blockNumber.some
provider.latest = blockNumber.some
proc addBlocks*(provider: MockProvider, blocks: OrderedTableRef[int, Block]) =
for number, blk in blocks.pairs:
if provider.blocks.hasKey(number):
continue
provider.updateEarliestAndLatest(number)
provider.blocks[number] = blk
proc addBlock*(provider: MockProvider, number: int, blk: Block) =
if not provider.blocks.hasKey(number):
provider.updateEarliestAndLatest(number)
provider.blocks[number] = blk
proc newMockProvider*(): MockProvider =
MockProvider(
blocks: newOrderedTable[int, Block](),
earliest: int.none,
latest: int.none
)
proc newMockProvider*(blocks: OrderedTableRef[int, Block]): MockProvider =
let provider = newMockProvider()
provider.addBlocks(blocks)
provider
proc newMockProvider*(
numberOfBlocks: int,
earliestBlockNumber: int,
earliestBlockTimestamp: SecondsSince1970,
timeIntervalBetweenBlocks: SecondsSince1970
): MockProvider =
var blocks = newOrderedTable[int, provider.Block]()
var blockNumber = earliestBlockNumber
var blockTime = earliestBlockTimestamp
for i in 0..<numberOfBlocks:
blocks[blockNumber] = provider.Block(number: blockNumber.u256.some,
timestamp: blockTime.u256, hash: BlockHash.none)
inc blockNumber
inc blockTime, timeIntervalBetweenBlocks.int
MockProvider(
blocks: blocks,
earliest: earliestBlockNumber.some,
latest: (earliestBlockNumber + numberOfBlocks - 1).some
)