734 lines
22 KiB
Nim
734 lines
22 KiB
Nim
## Nim-Libp2p
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## Copyright (c) 2018 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))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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## This module implements minimal Google's ProtoBuf primitives.
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{.push raises: [Defect].}
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import ../varint, stew/[endians2, results]
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export results
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const
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MaxMessageSize* = 1'u shl 22
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type
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ProtoFieldKind* = enum
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## Protobuf's field types enum
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Varint, Fixed64, Length, StartGroup, EndGroup, Fixed32
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ProtoFlags* = enum
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## Protobuf's encoding types
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WithVarintLength, WithUint32BeLength, WithUint32LeLength
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ProtoBuffer* = object
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## Protobuf's message representation object
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options: set[ProtoFlags]
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buffer*: seq[byte]
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offset*: int
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length*: int
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ProtoHeader* = object
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wire*: ProtoFieldKind
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index*: uint64
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ProtoField* = object
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## Protobuf's message field representation object
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index*: int
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case kind*: ProtoFieldKind
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of Varint:
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vint*: uint64
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of Fixed64:
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vfloat64*: float64
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of Length:
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vbuffer*: seq[byte]
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of Fixed32:
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vfloat32*: float32
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of StartGroup, EndGroup:
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discard
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ProtoError* {.pure.} = enum
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VarintDecode,
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MessageIncomplete,
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BufferOverflow,
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MessageTooBig,
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BadWireType,
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IncorrectBlob,
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RequiredFieldMissing
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ProtoResult*[T] = Result[T, ProtoError]
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ProtoScalar* = uint | uint32 | uint64 | zint | zint32 | zint64 |
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hint | hint32 | hint64 | float32 | float64
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const
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SupportedWireTypes* = {
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int(ProtoFieldKind.Varint),
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int(ProtoFieldKind.Fixed64),
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int(ProtoFieldKind.Length),
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int(ProtoFieldKind.Fixed32)
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}
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template checkFieldNumber*(i: int) =
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doAssert((i > 0 and i < (1 shl 29)) and not(i >= 19000 and i <= 19999),
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"Incorrect or reserved field number")
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template getProtoHeader*(index: int, wire: ProtoFieldKind): uint64 =
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## Get protobuf's field header integer for ``index`` and ``wire``.
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((uint64(index) shl 3) or uint64(wire))
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template getProtoHeader*(field: ProtoField): uint64 =
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## Get protobuf's field header integer for ``field``.
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((uint64(field.index) shl 3) or uint64(field.kind))
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template toOpenArray*(pb: ProtoBuffer): untyped =
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toOpenArray(pb.buffer, pb.offset, len(pb.buffer) - 1)
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template isEmpty*(pb: ProtoBuffer): bool =
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len(pb.buffer) - pb.offset <= 0
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template isEnough*(pb: ProtoBuffer, length: int): bool =
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len(pb.buffer) - pb.offset - length >= 0
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template getPtr*(pb: ProtoBuffer): pointer =
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cast[pointer](unsafeAddr pb.buffer[pb.offset])
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template getLen*(pb: ProtoBuffer): int =
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len(pb.buffer) - pb.offset
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proc vsizeof*(field: ProtoField): int {.inline.} =
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## Returns number of bytes required to store protobuf's field ``field``.
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case field.kind
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of ProtoFieldKind.Varint:
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vsizeof(getProtoHeader(field)) + vsizeof(field.vint)
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of ProtoFieldKind.Fixed64:
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vsizeof(getProtoHeader(field)) + sizeof(field.vfloat64)
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of ProtoFieldKind.Fixed32:
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vsizeof(getProtoHeader(field)) + sizeof(field.vfloat32)
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of ProtoFieldKind.Length:
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vsizeof(getProtoHeader(field)) + vsizeof(uint64(len(field.vbuffer))) +
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len(field.vbuffer)
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else:
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0
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proc initProtoBuffer*(data: seq[byte], offset = 0,
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options: set[ProtoFlags] = {}): ProtoBuffer =
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## Initialize ProtoBuffer with shallow copy of ``data``.
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shallowCopy(result.buffer, data)
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result.offset = offset
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result.options = options
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proc initProtoBuffer*(data: openArray[byte], offset = 0,
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options: set[ProtoFlags] = {}): ProtoBuffer =
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## Initialize ProtoBuffer with copy of ``data``.
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result.buffer = @data
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result.offset = offset
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result.options = options
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proc initProtoBuffer*(options: set[ProtoFlags] = {}): ProtoBuffer =
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## Initialize ProtoBuffer with new sequence of capacity ``cap``.
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result.buffer = newSeq[byte]()
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result.options = options
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if WithVarintLength in options:
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# Our buffer will start from position 10, so we can store length of buffer
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# in [0, 9].
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result.buffer.setLen(10)
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result.offset = 10
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elif {WithUint32LeLength, WithUint32BeLength} * options != {}:
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# Our buffer will start from position 4, so we can store length of buffer
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# in [0, 3].
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result.buffer.setLen(4)
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result.offset = 4
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proc write*[T: ProtoScalar](pb: var ProtoBuffer,
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field: int, value: T) =
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checkFieldNumber(field)
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var length = 0
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when (T is uint64) or (T is uint32) or (T is uint) or
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(T is zint64) or (T is zint32) or (T is zint) or
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(T is hint64) or (T is hint32) or (T is hint):
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let flength = vsizeof(getProtoHeader(field, ProtoFieldKind.Varint)) +
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vsizeof(value)
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let header = ProtoFieldKind.Varint
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elif T is float32:
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let flength = vsizeof(getProtoHeader(field, ProtoFieldKind.Fixed32)) +
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sizeof(T)
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let header = ProtoFieldKind.Fixed32
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elif T is float64:
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let flength = vsizeof(getProtoHeader(field, ProtoFieldKind.Fixed64)) +
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sizeof(T)
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let header = ProtoFieldKind.Fixed64
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pb.buffer.setLen(len(pb.buffer) + flength)
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let hres = PB.putUVarint(pb.toOpenArray(), length,
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getProtoHeader(field, header))
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doAssert(hres.isOk())
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pb.offset += length
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when (T is uint64) or (T is uint32) or (T is uint):
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let vres = PB.putUVarint(pb.toOpenArray(), length, value)
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doAssert(vres.isOk())
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pb.offset += length
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elif (T is zint64) or (T is zint32) or (T is zint) or
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(T is hint64) or (T is hint32) or (T is hint):
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let vres = putSVarint(pb.toOpenArray(), length, value)
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doAssert(vres.isOk())
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pb.offset += length
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elif T is float32:
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doAssert(pb.isEnough(sizeof(T)))
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let u32 = cast[uint32](value)
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pb.buffer[pb.offset ..< pb.offset + sizeof(T)] = u32.toBytesLE()
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pb.offset += sizeof(T)
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elif T is float64:
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doAssert(pb.isEnough(sizeof(T)))
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let u64 = cast[uint64](value)
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pb.buffer[pb.offset ..< pb.offset + sizeof(T)] = u64.toBytesLE()
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pb.offset += sizeof(T)
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proc writePacked*[T: ProtoScalar](pb: var ProtoBuffer, field: int,
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value: openArray[T]) =
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checkFieldNumber(field)
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var length = 0
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let dlength =
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when (T is uint64) or (T is uint32) or (T is uint) or
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(T is zint64) or (T is zint32) or (T is zint) or
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(T is hint64) or (T is hint32) or (T is hint):
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var res = 0
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for item in value:
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res += vsizeof(item)
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res
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elif (T is float32) or (T is float64):
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len(value) * sizeof(T)
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let header = getProtoHeader(field, ProtoFieldKind.Length)
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let flength = vsizeof(header) + vsizeof(uint64(dlength)) + dlength
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pb.buffer.setLen(len(pb.buffer) + flength)
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let hres = PB.putUVarint(pb.toOpenArray(), length, header)
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doAssert(hres.isOk())
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pb.offset += length
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length = 0
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let lres = PB.putUVarint(pb.toOpenArray(), length, uint64(dlength))
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doAssert(lres.isOk())
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pb.offset += length
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for item in value:
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when (T is uint64) or (T is uint32) or (T is uint):
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length = 0
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let vres = PB.putUVarint(pb.toOpenArray(), length, item)
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doAssert(vres.isOk())
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pb.offset += length
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elif (T is zint64) or (T is zint32) or (T is zint) or
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(T is hint64) or (T is hint32) or (T is hint):
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length = 0
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let vres = PB.putSVarint(pb.toOpenArray(), length, item)
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doAssert(vres.isOk())
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pb.offset += length
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elif T is float32:
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doAssert(pb.isEnough(sizeof(T)))
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let u32 = cast[uint32](item)
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pb.buffer[pb.offset ..< pb.offset + sizeof(T)] = u32.toBytesLE()
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pb.offset += sizeof(T)
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elif T is float64:
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doAssert(pb.isEnough(sizeof(T)))
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let u64 = cast[uint64](item)
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pb.buffer[pb.offset ..< pb.offset + sizeof(T)] = u64.toBytesLE()
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pb.offset += sizeof(T)
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proc write*[T: byte|char](pb: var ProtoBuffer, field: int,
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value: openArray[T]) =
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checkFieldNumber(field)
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var length = 0
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let flength = vsizeof(getProtoHeader(field, ProtoFieldKind.Length)) +
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vsizeof(uint64(len(value))) + len(value)
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pb.buffer.setLen(len(pb.buffer) + flength)
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let hres = PB.putUVarint(pb.toOpenArray(), length,
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getProtoHeader(field, ProtoFieldKind.Length))
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doAssert(hres.isOk())
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pb.offset += length
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let lres = PB.putUVarint(pb.toOpenArray(), length,
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uint64(len(value)))
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doAssert(lres.isOk())
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pb.offset += length
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if len(value) > 0:
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doAssert(pb.isEnough(len(value)))
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copyMem(addr pb.buffer[pb.offset], unsafeAddr value[0], len(value))
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pb.offset += len(value)
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proc write*(pb: var ProtoBuffer, field: int, value: ProtoBuffer) {.inline.} =
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## Encode Protobuf's sub-message ``value`` and store it to protobuf's buffer
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## ``pb`` with field number ``field``.
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write(pb, field, value.buffer)
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proc finish*(pb: var ProtoBuffer) =
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## Prepare protobuf's buffer ``pb`` for writing to stream.
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if WithVarintLength in pb.options:
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doAssert(len(pb.buffer) >= 10)
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let size = uint(len(pb.buffer) - 10)
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let pos = 10 - vsizeof(size)
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var usedBytes = 0
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let res = PB.putUVarint(pb.buffer.toOpenArray(pos, 9), usedBytes, size)
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doAssert(res.isOk())
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pb.offset = pos
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elif WithUint32BeLength in pb.options:
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doAssert(len(pb.buffer) >= 4)
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let size = uint(len(pb.buffer) - 4)
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pb.buffer[0 ..< 4] = toBytesBE(uint32(size))
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pb.offset = 4
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elif WithUint32LeLength in pb.options:
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doAssert(len(pb.buffer) >= 4)
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let size = uint(len(pb.buffer) - 4)
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pb.buffer[0 ..< 4] = toBytesLE(uint32(size))
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pb.offset = 4
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else:
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doAssert(len(pb.buffer) > 0)
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pb.offset = 0
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proc getHeader(data: var ProtoBuffer,
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header: var ProtoHeader): ProtoResult[void] =
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var length = 0
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var hdr = 0'u64
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if PB.getUVarint(data.toOpenArray(), length, hdr).isOk():
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let index = uint64(hdr shr 3)
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let wire = hdr and 0x07
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if wire in SupportedWireTypes:
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data.offset += length
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header = ProtoHeader(index: index, wire: cast[ProtoFieldKind](wire))
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ok()
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else:
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err(ProtoError.BadWireType)
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else:
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err(ProtoError.VarintDecode)
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proc skipValue(data: var ProtoBuffer, header: ProtoHeader): ProtoResult[void] =
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case header.wire
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of ProtoFieldKind.Varint:
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var length = 0
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var value = 0'u64
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if PB.getUVarint(data.toOpenArray(), length, value).isOk():
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data.offset += length
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ok()
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else:
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err(ProtoError.VarintDecode)
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of ProtoFieldKind.Fixed32:
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if data.isEnough(sizeof(uint32)):
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data.offset += sizeof(uint32)
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ok()
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else:
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err(ProtoError.VarintDecode)
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of ProtoFieldKind.Fixed64:
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if data.isEnough(sizeof(uint64)):
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data.offset += sizeof(uint64)
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ok()
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else:
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err(ProtoError.VarintDecode)
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of ProtoFieldKind.Length:
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var length = 0
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var bsize = 0'u64
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if PB.getUVarint(data.toOpenArray(), length, bsize).isOk():
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data.offset += length
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if bsize <= uint64(MaxMessageSize):
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if data.isEnough(int(bsize)):
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data.offset += int(bsize)
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ok()
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else:
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err(ProtoError.MessageIncomplete)
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else:
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err(ProtoError.MessageTooBig)
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else:
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err(ProtoError.VarintDecode)
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of ProtoFieldKind.StartGroup, ProtoFieldKind.EndGroup:
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err(ProtoError.BadWireType)
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proc getValue[T: ProtoScalar](data: var ProtoBuffer,
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header: ProtoHeader,
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outval: var T): ProtoResult[void] =
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when (T is uint64) or (T is uint32) or (T is uint):
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doAssert(header.wire == ProtoFieldKind.Varint)
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var length = 0
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var value = T(0)
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if PB.getUVarint(data.toOpenArray(), length, value).isOk():
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data.offset += length
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outval = value
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ok()
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else:
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err(ProtoError.VarintDecode)
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elif (T is zint64) or (T is zint32) or (T is zint) or
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(T is hint64) or (T is hint32) or (T is hint):
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doAssert(header.wire == ProtoFieldKind.Varint)
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var length = 0
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var value = T(0)
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if getSVarint(data.toOpenArray(), length, value).isOk():
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data.offset += length
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outval = value
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ok()
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else:
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err(ProtoError.VarintDecode)
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elif T is float32:
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doAssert(header.wire == ProtoFieldKind.Fixed32)
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if data.isEnough(sizeof(float32)):
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outval = cast[float32](fromBytesLE(uint32, data.toOpenArray()))
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data.offset += sizeof(float32)
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ok()
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else:
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err(ProtoError.MessageIncomplete)
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elif T is float64:
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doAssert(header.wire == ProtoFieldKind.Fixed64)
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if data.isEnough(sizeof(float64)):
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outval = cast[float64](fromBytesLE(uint64, data.toOpenArray()))
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data.offset += sizeof(float64)
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ok()
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else:
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err(ProtoError.MessageIncomplete)
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proc getValue[T:byte|char](data: var ProtoBuffer, header: ProtoHeader,
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outBytes: var openArray[T],
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outLength: var int): ProtoResult[void] =
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doAssert(header.wire == ProtoFieldKind.Length)
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var length = 0
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var bsize = 0'u64
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outLength = 0
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if PB.getUVarint(data.toOpenArray(), length, bsize).isOk():
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data.offset += length
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if bsize <= uint64(MaxMessageSize):
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if data.isEnough(int(bsize)):
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outLength = int(bsize)
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if len(outBytes) >= int(bsize):
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if bsize > 0'u64:
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copyMem(addr outBytes[0], addr data.buffer[data.offset], int(bsize))
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data.offset += int(bsize)
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ok()
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else:
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# Buffer overflow should not be critical failure
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data.offset += int(bsize)
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err(ProtoError.BufferOverflow)
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else:
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err(ProtoError.MessageIncomplete)
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else:
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err(ProtoError.MessageTooBig)
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else:
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err(ProtoError.VarintDecode)
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|
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proc getValue[T:seq[byte]|string](data: var ProtoBuffer, header: ProtoHeader,
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outBytes: var T): ProtoResult[void] =
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doAssert(header.wire == ProtoFieldKind.Length)
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var length = 0
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var bsize = 0'u64
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outBytes.setLen(0)
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if PB.getUVarint(data.toOpenArray(), length, bsize).isOk():
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data.offset += length
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if bsize <= uint64(MaxMessageSize):
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if data.isEnough(int(bsize)):
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outBytes.setLen(bsize)
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if bsize > 0'u64:
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copyMem(addr outBytes[0], addr data.buffer[data.offset], int(bsize))
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data.offset += int(bsize)
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ok()
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else:
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err(ProtoError.MessageIncomplete)
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else:
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err(ProtoError.MessageTooBig)
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else:
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err(ProtoError.VarintDecode)
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|
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proc getField*[T: ProtoScalar](data: ProtoBuffer, field: int,
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output: var T): ProtoResult[bool] =
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checkFieldNumber(field)
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var current: T
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var res = false
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var pb = data
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|
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while not(pb.isEmpty()):
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var header: ProtoHeader
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? pb.getHeader(header)
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let wireCheck =
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when (T is uint64) or (T is uint32) or (T is uint) or
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(T is zint64) or (T is zint32) or (T is zint) or
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(T is hint64) or (T is hint32) or (T is hint):
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header.wire == ProtoFieldKind.Varint
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elif T is float32:
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header.wire == ProtoFieldKind.Fixed32
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elif T is float64:
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header.wire == ProtoFieldKind.Fixed64
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if header.index == uint64(field):
|
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if wireCheck:
|
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var value: T
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let vres = pb.getValue(header, value)
|
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if vres.isOk():
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res = true
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current = value
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else:
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return err(vres.error)
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else:
|
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# We are ignoring wire types different from what we expect, because it
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# is how `protoc` is working.
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? pb.skipValue(header)
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else:
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? pb.skipValue(header)
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|
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if res:
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output = current
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ok(true)
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else:
|
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ok(false)
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|
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proc getField*[T: byte|char](data: ProtoBuffer, field: int,
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output: var openArray[T],
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outlen: var int): ProtoResult[bool] =
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checkFieldNumber(field)
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var pb = data
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var res = false
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outlen = 0
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while not(pb.isEmpty()):
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var header: ProtoHeader
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let hres = pb.getHeader(header)
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if hres.isErr():
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if len(output) > 0:
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zeroMem(addr output[0], len(output))
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outlen = 0
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return err(hres.error)
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if header.index == uint64(field):
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if header.wire == ProtoFieldKind.Length:
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let vres = pb.getValue(header, output, outlen)
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if vres.isOk():
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res = true
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else:
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# Buffer overflow error is not critical error, we still can get
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# field values with proper size.
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if vres.error != ProtoError.BufferOverflow:
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if len(output) > 0:
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zeroMem(addr output[0], len(output))
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outlen = 0
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return err(vres.error)
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else:
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# We are ignoring wire types different from ProtoFieldKind.Length,
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# because it is how `protoc` is working.
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let sres = pb.skipValue(header)
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if sres.isErr():
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if len(output) > 0:
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zeroMem(addr output[0], len(output))
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outlen = 0
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return err(sres.error)
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else:
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let sres = pb.skipValue(header)
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if sres.isErr():
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if len(output) > 0:
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zeroMem(addr output[0], len(output))
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outlen = 0
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return err(sres.error)
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if res:
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ok(true)
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else:
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ok(false)
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proc getField*[T: seq[byte]|string](data: ProtoBuffer, field: int,
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output: var T): ProtoResult[bool] =
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checkFieldNumber(field)
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var res = false
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var pb = data
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while not(pb.isEmpty()):
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var header: ProtoHeader
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let hres = pb.getHeader(header)
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if hres.isErr():
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output.setLen(0)
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return err(hres.error)
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if header.index == uint64(field):
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if header.wire == ProtoFieldKind.Length:
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let vres = pb.getValue(header, output)
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if vres.isOk():
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res = true
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else:
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output.setLen(0)
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return err(vres.error)
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else:
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# We are ignoring wire types different from ProtoFieldKind.Length,
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# because it is how `protoc` is working.
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let sres = pb.skipValue(header)
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if sres.isErr():
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output.setLen(0)
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return err(sres.error)
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else:
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let sres = pb.skipValue(header)
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if sres.isErr():
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output.setLen(0)
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return err(sres.error)
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if res:
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ok(true)
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else:
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ok(false)
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proc getField*(pb: ProtoBuffer, field: int,
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output: var ProtoBuffer): ProtoResult[bool] {.inline.} =
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var buffer: seq[byte]
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let res = pb.getField(field, buffer)
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if res.isOk():
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if res.get():
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output = initProtoBuffer(buffer)
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ok(true)
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else:
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ok(false)
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else:
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err(res.error)
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proc getRequiredField*[T](pb: ProtoBuffer, field: int,
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output: var T): ProtoResult[void] {.inline.} =
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let res = pb.getField(field, output)
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|
if res.isOk():
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if res.get():
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ok()
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else:
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err(RequiredFieldMissing)
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else:
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err(res.error)
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|
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proc getRepeatedField*[T: seq[byte]|string](data: ProtoBuffer, field: int,
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output: var seq[T]): ProtoResult[bool] =
|
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checkFieldNumber(field)
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|
var pb = data
|
|
output.setLen(0)
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|
|
|
while not(pb.isEmpty()):
|
|
var header: ProtoHeader
|
|
let hres = pb.getHeader(header)
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|
if hres.isErr():
|
|
output.setLen(0)
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|
return err(hres.error)
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if header.index == uint64(field):
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|
if header.wire == ProtoFieldKind.Length:
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|
var item: T
|
|
let vres = pb.getValue(header, item)
|
|
if vres.isOk():
|
|
output.add(item)
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|
else:
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|
output.setLen(0)
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|
return err(vres.error)
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|
else:
|
|
let sres = pb.skipValue(header)
|
|
if sres.isErr():
|
|
output.setLen(0)
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|
return err(sres.error)
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|
else:
|
|
let sres = pb.skipValue(header)
|
|
if sres.isErr():
|
|
output.setLen(0)
|
|
return err(sres.error)
|
|
|
|
if len(output) > 0:
|
|
ok(true)
|
|
else:
|
|
ok(false)
|
|
|
|
proc getRepeatedField*[T: ProtoScalar](data: ProtoBuffer, field: int,
|
|
output: var seq[T]): ProtoResult[bool] =
|
|
checkFieldNumber(field)
|
|
var pb = data
|
|
output.setLen(0)
|
|
|
|
while not(pb.isEmpty()):
|
|
var header: ProtoHeader
|
|
let hres = pb.getHeader(header)
|
|
if hres.isErr():
|
|
output.setLen(0)
|
|
return err(hres.error)
|
|
|
|
if header.index == uint64(field):
|
|
if header.wire in {ProtoFieldKind.Varint, ProtoFieldKind.Fixed32,
|
|
ProtoFieldKind.Fixed64}:
|
|
var item: T
|
|
let vres = getValue(pb, header, item)
|
|
if vres.isOk():
|
|
output.add(item)
|
|
else:
|
|
output.setLen(0)
|
|
return err(vres.error)
|
|
else:
|
|
let sres = skipValue(pb, header)
|
|
if sres.isErr():
|
|
output.setLen(0)
|
|
return err(sres.error)
|
|
else:
|
|
let sres = skipValue(pb, header)
|
|
if sres.isErr():
|
|
output.setLen(0)
|
|
return err(sres.error)
|
|
|
|
if len(output) > 0:
|
|
ok(true)
|
|
else:
|
|
ok(false)
|
|
|
|
proc getRequiredRepeatedField*[T](pb: ProtoBuffer, field: int,
|
|
output: var seq[T]): ProtoResult[void] {.inline.} =
|
|
let res = pb.getRepeatedField(field, output)
|
|
if res.isOk():
|
|
if res.get():
|
|
ok()
|
|
else:
|
|
err(RequiredFieldMissing)
|
|
else:
|
|
err(res.error)
|
|
|
|
proc getPackedRepeatedField*[T: ProtoScalar](data: ProtoBuffer, field: int,
|
|
output: var seq[T]): ProtoResult[bool] =
|
|
checkFieldNumber(field)
|
|
var pb = data
|
|
output.setLen(0)
|
|
|
|
while not(pb.isEmpty()):
|
|
var header: ProtoHeader
|
|
let hres = pb.getHeader(header)
|
|
if hres.isErr():
|
|
output.setLen(0)
|
|
return err(hres.error)
|
|
|
|
if header.index == uint64(field):
|
|
if header.wire == ProtoFieldKind.Length:
|
|
var arritem: seq[byte]
|
|
let ares = getValue(pb, header, arritem)
|
|
if ares.isOk():
|
|
var pbarr = initProtoBuffer(arritem)
|
|
let itemHeader =
|
|
when (T is uint64) or (T is uint32) or (T is uint) or
|
|
(T is zint64) or (T is zint32) or (T is zint) or
|
|
(T is hint64) or (T is hint32) or (T is hint):
|
|
ProtoHeader(wire: ProtoFieldKind.Varint)
|
|
elif T is float32:
|
|
ProtoHeader(wire: ProtoFieldKind.Fixed32)
|
|
elif T is float64:
|
|
ProtoHeader(wire: ProtoFieldKind.Fixed64)
|
|
while not(pbarr.isEmpty()):
|
|
var item: T
|
|
let vres = getValue(pbarr, itemHeader, item)
|
|
if vres.isOk():
|
|
output.add(item)
|
|
else:
|
|
output.setLen(0)
|
|
return err(vres.error)
|
|
else:
|
|
output.setLen(0)
|
|
return err(ares.error)
|
|
else:
|
|
let sres = skipValue(pb, header)
|
|
if sres.isErr():
|
|
output.setLen(0)
|
|
return err(sres.error)
|
|
else:
|
|
let sres = skipValue(pb, header)
|
|
if sres.isErr():
|
|
output.setLen(0)
|
|
return err(sres.error)
|
|
|
|
if len(output) > 0:
|
|
ok(true)
|
|
else:
|
|
ok(false)
|