split SSZ and JSON parsing logic in LC handler (#5055)
Use separate functions per format when parsing LC data from REST. This allows to process events from the eventstream more directly, as they are always JSON not SSZ. And also makes the code cleaner.
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@ -38,119 +38,153 @@ func checkForkConsistency(
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consensusFork: ConsensusFork) {.raises: [RestError].} =
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obj.checkForkConsistency(cfg, Opt[ConsensusFork].ok(consensusFork))
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func decodeSszLightClientObject[T: SomeForkedLightClientObject](
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x: typedesc[T],
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data: openArray[byte],
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consensusFork: ConsensusFork,
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cfg: RuntimeConfig): T {.raises: [RestError].} =
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try:
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withLcDataFork(lcDataForkAtConsensusFork(consensusFork)):
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when lcDataFork > LightClientDataFork.None:
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var obj = T(kind: lcDataFork)
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obj.forky(lcDataFork) = SSZ.decode(data, T.Forky(lcDataFork))
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obj.checkForkConsistency(cfg, consensusFork)
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obj
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else:
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raiseRestDecodingBytesError(
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cstring("Unsupported fork: " & $consensusFork))
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except SszError as exc:
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raiseRestDecodingBytesError(cstring("Malformed data: " & $exc.msg))
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proc decodeJsonLightClientObject[T: SomeForkedLightClientObject](
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x: typedesc[T],
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data: openArray[byte],
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consensusFork: Opt[ConsensusFork],
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cfg: RuntimeConfig): T {.raises: [RestError].} =
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let objRes = decodeBytes(T, data, Opt.none(ContentTypeData))
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if objRes.isErr:
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raiseRestDecodingBytesError(objRes.error)
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template obj: auto = objRes.get
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obj.checkForkConsistency(cfg, consensusFork)
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obj
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proc decodeHttpLightClientObject*[T: SomeForkedLightClientObject](
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x: typedesc[T],
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data: openArray[byte],
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mediaType: MediaType,
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consensusFork: ConsensusFork,
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cfg: RuntimeConfig): T {.raises: [RestError].} =
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if mediaType == OctetStreamMediaType:
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x.decodeSszLightClientObject(data, consensusFork, cfg)
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elif mediaType == ApplicationJsonMediaType:
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x.decodeJsonLightClientObject(data, Opt.some(consensusFork), cfg)
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else:
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raise newException(RestError, "Unsupported content-type")
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proc decodeHttpLightClientObject[T: SomeForkedLightClientObject](
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x: typedesc[T],
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data: seq[byte],
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data: openArray[byte],
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contentType: Opt[ContentTypeData],
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consensusFork: ConsensusFork,
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cfg: RuntimeConfig): T {.raises: [RestError].} =
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let mediaTypeRes = decodeMediaType(contentType)
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if mediaTypeRes.isErr:
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raise newException(RestError, mediaTypeRes.error)
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template mediaType: auto = mediaTypeRes.get
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x.decodeHttpLightClientObject(data, mediaTypeRes.get, consensusFork, cfg)
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return
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if mediaType == OctetStreamMediaType:
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try:
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withLcDataFork(lcDataForkAtConsensusFork(consensusFork)):
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when lcDataFork > LightClientDataFork.None:
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var obj = T(kind: lcDataFork)
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obj.forky(lcDataFork) = SSZ.decode(data, T.Forky(lcDataFork))
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obj.checkForkConsistency(cfg, consensusFork)
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obj
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else:
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raiseRestDecodingBytesError(
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cstring("Unsupported fork: " & $consensusFork))
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except SszError as exc:
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raiseRestDecodingBytesError(cstring("Malformed data: " & $exc.msg))
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proc decodeSszLightClientObjects[S: seq[SomeForkedLightClientObject]](
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x: typedesc[S],
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data: openArray[byte],
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cfg: RuntimeConfig,
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forkDigests: ref ForkDigests): S {.raises: [RestError].} =
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let l = data.len
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var
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res: S
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o = 0
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while l - o != 0:
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# response_chunk_len
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type chunkLenType = uint64
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const chunkLenLen = sizeof chunkLenType # 8
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if l - o < chunkLenLen:
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raiseRestDecodingBytesError("Malformed data: Incomplete length")
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let responseChunkLen = chunkLenType.fromBytesLE(
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data.toOpenArray(o, o + chunkLenLen - 1))
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o = o + chunkLenLen
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elif mediaType == ApplicationJsonMediaType:
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let objRes = decodeBytes(T, data, contentType)
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if objRes.isErr:
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raiseRestDecodingBytesError(objRes.error)
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template obj: auto = objRes.get
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obj.checkForkConsistency(cfg, consensusFork)
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obj
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# response_chunk
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if responseChunkLen > int.high.chunkLenType:
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raiseRestDecodingBytesError("Malformed data: Unsupported length")
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if l - o < responseChunkLen.int:
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raiseRestDecodingBytesError("Malformed data: Incomplete chunk")
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let
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begin = o
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after = o + responseChunkLen.int
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o += responseChunkLen.int
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else:
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raise newException(RestError, "Unsupported content-type")
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# context
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const contextLen = sizeof ForkDigest # 4
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if responseChunkLen < contextLen.chunkLenType:
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raiseRestDecodingBytesError("Malformed data: Incomplete context")
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let
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context = ForkDigest [
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data[begin + 0], data[begin + 1], data[begin + 2], data[begin + 3]]
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consensusFork = forkDigests[].consensusForkForDigest(context).valueOr:
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raiseRestDecodingBytesError("Malformed data: Invalid context")
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# payload
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try:
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withLcDataFork(lcDataForkAtConsensusFork(consensusFork)):
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when lcDataFork > LightClientDataFork.None:
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type T = typeof(res[0])
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var obj = T(kind: lcDataFork)
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obj.forky(lcDataFork) = SSZ.decode(
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data.toOpenArray(begin + contextLen, after - 1),
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T.Forky(lcDataFork))
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obj.checkForkConsistency(cfg, consensusFork)
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res.add obj
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else:
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raiseRestDecodingBytesError(
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cstring("Unsupported fork: " & $consensusFork))
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except SszError as exc:
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raiseRestDecodingBytesError(cstring("Malformed data: " & $exc.msg))
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res
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proc decodeJsonLightClientObjects[S: seq[SomeForkedLightClientObject]](
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x: typedesc[S],
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data: openArray[byte],
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cfg: RuntimeConfig,
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forkDigests: ref ForkDigests): S {.raises: [RestError].} =
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let objsRes = decodeBytes(S, data, Opt.none(ContentTypeData))
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if objsRes.isErr:
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raiseRestDecodingBytesError(objsRes.error)
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template objs: auto = objsRes.get
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for obj in objs:
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obj.checkForkConsistency(cfg)
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objs
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proc decodeHttpLightClientObjects*[S: seq[SomeForkedLightClientObject]](
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x: typedesc[S],
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data: openArray[byte],
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mediaType: MediaType,
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cfg: RuntimeConfig,
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forkDigests: ref ForkDigests): S {.raises: [RestError].} =
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if mediaType == OctetStreamMediaType:
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x.decodeSszLightClientObjects(data, cfg, forkDigests)
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elif mediaType == ApplicationJsonMediaType:
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x.decodeJsonLightClientObjects(data, cfg, forkDigests)
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else:
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raise newException(RestError, "Unsupported content-type")
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proc decodeHttpLightClientObjects[S: seq[SomeForkedLightClientObject]](
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x: typedesc[S],
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data: seq[byte],
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data: openArray[byte],
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contentType: Opt[ContentTypeData],
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cfg: RuntimeConfig,
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forkDigests: ref ForkDigests): S {.raises: [RestError].} =
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let mediaTypeRes = decodeMediaType(contentType)
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if mediaTypeRes.isErr:
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raise newException(RestError, mediaTypeRes.error)
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template mediaType: auto = mediaTypeRes.get
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return
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if mediaType == OctetStreamMediaType:
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let l = data.len
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var
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res: S
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o = 0
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while l - o != 0:
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# response_chunk_len
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type chunkLenType = uint64
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const chunkLenLen = sizeof chunkLenType # 8
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if l - o < chunkLenLen:
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raiseRestDecodingBytesError("Malformed data: Incomplete length")
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let responseChunkLen = chunkLenType.fromBytesLE(
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data.toOpenArray(o, o + chunkLenLen - 1))
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o = o + chunkLenLen
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# response_chunk
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if responseChunkLen > int.high.chunkLenType:
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raiseRestDecodingBytesError("Malformed data: Unsupported length")
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if l - o < responseChunkLen.int:
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raiseRestDecodingBytesError("Malformed data: Incomplete chunk")
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let
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begin = o
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after = o + responseChunkLen.int
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o += responseChunkLen.int
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# context
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const contextLen = sizeof ForkDigest # 4
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if responseChunkLen < contextLen.chunkLenType:
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raiseRestDecodingBytesError("Malformed data: Incomplete context")
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let
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context = ForkDigest [
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data[begin + 0], data[begin + 1], data[begin + 2], data[begin + 3]]
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consensusFork = forkDigests[].consensusForkForDigest(context).valueOr:
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raiseRestDecodingBytesError("Malformed data: Invalid context")
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# payload
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try:
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withLcDataFork(lcDataForkAtConsensusFork(consensusFork)):
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when lcDataFork > LightClientDataFork.None:
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type T = typeof(res[0])
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var obj = T(kind: lcDataFork)
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obj.forky(lcDataFork) = SSZ.decode(
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data.toOpenArray(begin + contextLen, after - 1),
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T.Forky(lcDataFork))
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obj.checkForkConsistency(cfg, consensusFork)
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res.add obj
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else:
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raiseRestDecodingBytesError(
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cstring("Unsupported fork: " & $consensusFork))
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except SszError as exc:
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raiseRestDecodingBytesError(cstring("Malformed data: " & $exc.msg))
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res
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elif mediaType == ApplicationJsonMediaType:
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let objsRes = decodeBytes(S, data, contentType)
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if objsRes.isErr:
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raiseRestDecodingBytesError(objsRes.error)
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template objs: auto = objsRes.get
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for obj in objs:
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obj.checkForkConsistency(cfg)
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objs
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else:
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raise newException(RestError, "Unsupported content-type")
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x.decodeHttpLightClientObjects(data, mediaTypeRes.get, cfg, forkDigests)
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proc getLightClientBootstrapPlain(
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block_root: Eth2Digest): RestHttpResponseRef {.
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