50 lines
1.5 KiB
Nim
50 lines
1.5 KiB
Nim
import std/macros
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import pkg/contractabi
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import ./basics
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import ./provider
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type
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Event* = object of RootObj
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push: {.upraises: [].}
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template indexed* {.pragma.}
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func decode*[E: Event](decoder: var AbiDecoder, _: type E): ?!E =
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var event: E
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decoder.startTuple()
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for field in event.fields:
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if not field.hasCustomPragma(indexed):
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field = ?decoder.read(typeof(field))
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decoder.finishTuple()
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success event
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func fitsInIndexedField(T: type): bool {.compileTime.} =
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const supportedTypes = [
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"uint8", "uint16", "uint32", "uint64", "uint256", "uint128",
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"int8", "int16", "int32", "int64", "int256", "int128",
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"bool", "address",
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"bytes1", "bytes2", "bytes3", "bytes4",
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"bytes5", "bytes6", "bytes7", "bytes8",
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"bytes9", "bytes10", "bytes11", "bytes12",
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"bytes13", "bytes14", "bytes15", "bytes16",
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"bytes17", "bytes18", "bytes19", "bytes20",
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"bytes21", "bytes22", "bytes23", "bytes24",
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"bytes25", "bytes26", "bytes27", "bytes28",
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"bytes29", "bytes30", "bytes31", "bytes32"
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]
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solidityType(T) in supportedTypes
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func decode*[E: Event](_: type E, data: seq[byte], topics: seq[Topic]): ?!E =
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var event = ?Abidecoder.decode(data, E)
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var i = 1
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for field in event.fields:
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if field.hasCustomPragma(indexed):
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if i >= topics.len:
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return failure "indexed event parameter not found"
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when typeof(field).fitsInIndexedField:
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field = ?AbiDecoder.decode(@(topics[i]), typeof(field))
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inc i
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success event
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