fix and test parsing of incomplete packets
lurchi
parent
90eb96c889
commit
bc3801ed65
199
parse.nim
199
parse.nim
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@ -89,6 +89,7 @@ proc parseModifierName(input: string,
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return
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(result.complete, result.name) = parseKeyword(input, packet)
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if not result.complete:
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packet.cursor.dec()
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return
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# the following separator must either be ' ' (binary-arg) or '\t' (simple-arg)
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if input[packet.cursor - 1] == ' ':
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@ -111,6 +112,9 @@ proc parseModifierSimpleValue(input: string,
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result = input.getUntil(['\n'], packet)
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if result.complete:
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packet.cursor.inc()
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else:
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result.value = input[packet.cursor .. input.high()]
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packet.cursor += result.value.len()
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proc parseModifierValue(input: string,
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packet: var PsycPacket): tuple[complete: bool,
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@ -118,13 +122,17 @@ proc parseModifierValue(input: string,
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assert(packet.cursor < input.len())
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if packet.remainingPartLen < 0:
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return parseModifierSimpleValue(input, packet)
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result.complete = packet.remainingPartLen < input.high() - packet.cursor
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result.complete = packet.remainingPartLen <= input.high() + "\n".len() - packet.cursor
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if result.complete:
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result.value = input[packet.cursor .. packet.cursor + packet.remainingPartLen - 1]
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if input[packet.cursor + packet.remainingPartLen] != '\n':
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raise new(ValueError) # missing '\n' after binary-arg
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packet.cursor += packet.remainingPartLen + 1
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packet.cursor += result.value.len() + 1
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packet.remainingPartLen = -1
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else:
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result.value = input[packet.cursor .. input.high()]
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packet.cursor += result.value.len()
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packet.remainingPartLen -= result.value.len()
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proc parseContentLength(input: string,
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packet: var PsycPacket): tuple[complete: bool, value: int] =
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@ -143,22 +151,36 @@ proc parseContentLength(input: string,
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proc parseData(input: string,
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packet: var PsycPacket): tuple[complete: bool, value: string] =
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assert(packet.cursor < input.len())
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if packet.remainingPartLen < 0:
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if packet.contentLength < 0:
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if input.continuesWith("|\n", packet.cursor):
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return (true, "")
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let findResult = input.find("\n|\n")
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if findResult < 0:
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return (false, input[packet.cursor .. input.high()])
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return (true, input[packet.cursor .. findResult - 1])
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packet.remainingPartLen = packet.contentLength -
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packet.entityHeaderLen -
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packet.methodName.len() -
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sizeof('\n')
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result.complete = packet.remainingPartLen <= input.high() - packet.cursor
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if packet.contentLength < 0:
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if input.continuesWith("|\n", packet.cursor):
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packet.cursor += 2
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return (true, "")
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let findResult = input.find("\n|\n")
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if findResult < 0:
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result.complete = false
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result.value = input[packet.cursor .. input.high()]
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packet.cursor = input.high() + 1
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return
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else:
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result.complete = true
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result.value = input[packet.cursor .. findResult - 1]
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packet.cursor = findResult + 3
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return
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elif packet.remainingPartLen < 0:
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packet.remainingPartLen = packet.contentLength -
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packet.entityHeaderLen -
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packet.methodName.len() -
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sizeof('\n')
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result.complete =
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packet.remainingPartLen <= input.high() + "\n|\n".len() - packet.cursor
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if result.complete:
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result.value = input[packet.cursor .. packet.cursor + packet.remainingPartLen - 1]
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packet.cursor += packet.remainingPartLen + "\n|\n".len()
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packet.remainingPartLen = -1
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else:
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result.value = input[packet.cursor .. input.high()]
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packet.cursor += result.value.len()
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packet.remainingPartLen -= result.value.len()
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proc isModifierName(input: string, cursor: int): bool =
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const operators = ['=', ':', '+', '-', '?']
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@ -168,6 +190,7 @@ proc newPacket*(): PsycPacket =
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PsycPacket(routingHeader: newSeq[Modifier](),
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entityHeader: newSeq[Modifier](),
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state: ParseState.RoutingModifierName,
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contentLength: -1,
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remainingPartLen: -1)
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proc consumePart*(packet: var PsycPacket, slice: Slice[int]): string =
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@ -186,9 +209,6 @@ proc consumePart*(packet: var PsycPacket, slice: Slice[int]): string =
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proc parse*(input: string,
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packet: var PsycPacket): tuple[needMoreInput: bool,
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unparsed: Slice[int]] =
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#proc addedPart(packet: var PsycPacket, slice: Slice[int]) =
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# packet.remainingPartLen -= slice.len()
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# packet.cursor += slice.len()
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result.needMoreInput = true
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case packet.state:
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of ParseState.RoutingModifierName:
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@ -204,13 +224,14 @@ proc parse*(input: string,
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packet.routingHeader.add(modifier)
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of ParseState.RoutingModifierValue:
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let (complete, value) = parseModifierSimpleValue(input, packet)
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echo "parseModifierSimpleValue returned ", value
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result.needMoreInput = not complete
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if complete and value.len() > 0:
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packet.state = ParseState.RoutingModifierName
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if value.len() > 0:
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if packet.routingHeader[^1].value.isNil():
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packet.routingHeader[^1].value = ""
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packet.routingHeader[^1].value.add(value)
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#packet.addedPart(slice)
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if complete:
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packet.state = ParseState.RoutingModifierName
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of ParseState.ContentLength:
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let (complete, value) = parseContentLength(input, packet)
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if complete:
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@ -235,13 +256,12 @@ proc parse*(input: string,
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let (complete, value) = parseModifierValue(input, packet)
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result.needMoreInput = not complete
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packet.entityHeaderLen += (packet.cursor - oldCursor)
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if value.len() > 0:
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if packet.entityHeader[^1].value.isNil():
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packet.entityHeader[^1].value = ""
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packet.entityHeader[^1].value.add(value)
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if complete:
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packet.state = ParseState.EntityModifierName
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if not value.isNil():
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if packet.entityHeader[^1].value.isNil():
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packet.entityHeader[^1].value = ""
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packet.entityHeader[^1].value.add(value)
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#packet.addedPart(slice)
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of ParseState.Method:
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let (complete, value) = parseMethod(input, packet)
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if complete:
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@ -252,13 +272,15 @@ proc parse*(input: string,
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of ParseState.Data:
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let (complete, value) = parseData(input, packet)
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result.needMoreInput = not complete
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if value.len() > 0:
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packet.data.add(value)
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if complete:
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packet.state = ParseState.Complete
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packet.data.add(value)
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#packet.addedPart(slice)
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of ParseState.Complete:
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assert(false)
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result.unparsed = packet.cursor .. input.high()
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if packet.state != ParseState.Complete:
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result.needMoreInput = result.needMoreInput or packet.cursor > input.high()
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if result.needMoreInput:
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packet.cursor = 0
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@ -269,7 +291,8 @@ suite "parser tests":
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test "state sync":
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let input = ":_target\talice\n\n?\n|\n"
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while packet.state != ParseState.Complete:
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discard parse(input, packet)
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let (needMore, _) = parse(input, packet)
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check(not needMore)
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check(packet.routingHeader.len() == 1)
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check(packet.routingHeader[0] == Modifier(op: ':',
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name: "_target",
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@ -280,7 +303,8 @@ suite "parser tests":
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test "simple-arg":
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let input = ":_target\talice\n\n:_hello\tworld\n:_hallo\twelt\n|\n"
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while packet.state != ParseState.Complete:
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discard parse(input, packet)
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let (needMore, _) = parse(input, packet)
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check(not needMore)
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check(packet.entityHeader.len() == 2)
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check(packet.entityHeader[0] == Modifier(op: ':', name: "_hello", value: "world"))
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check(packet.entityHeader[1] == Modifier(op: ':', name: "_hallo", value: "welt"))
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@ -288,7 +312,8 @@ suite "parser tests":
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test "binary-arg":
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let input = ":_target\talice\n\n:_hello 5\tworld\n:_hallo 4\twelt\n|\n"
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while packet.state != ParseState.Complete:
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discard parse(input, packet)
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let (needMore, _) = parse(input, packet)
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check(not needMore)
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check(packet.entityHeader.len() == 2)
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check(packet.entityHeader[0] == Modifier(op: ':', name: "_hello", value: "world"))
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check(packet.entityHeader[1] == Modifier(op: ':', name: "_hallo", value: "welt"))
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@ -296,15 +321,123 @@ suite "parser tests":
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test "method/data":
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let input = ":_target\talice\n\n_hello_world\nHello Alice!\n|\n"
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while packet.state != ParseState.Complete:
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discard parse(input, packet)
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let (needMore, _) = parse(input, packet)
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check(not needMore)
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check(packet.methodName == "_hello_world")
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check(packet.data == "Hello Alice!")
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test "content length":
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let input = ":_target\talice\n39\n:_hello\tworld\n_hello_world\nHello Alice!\n|\n"
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while packet.state != ParseState.Complete:
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discard parse(input, packet)
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let (needMore, _) = parse(input, packet)
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check(not needMore)
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check(packet.contentLength == 39)
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check(packet.data == "Hello Alice!")
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test "incomplete":
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let
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input1 = ":_target\t"
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input2 = "alice\n"
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input3 = "39\n"
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input4 = ":_hello\t"
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input5 = "world\n"
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input6 = "_hello_world\n"
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input7 = "Hello Alice!\n|\n"
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var
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needMore: bool
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unparsed: Slice[int]
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(needMore, unparsed) = parse(input1[0..4], packet)
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check(needMore)
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check(unparsed == 0..4)
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check(packet.state == ParseState.RoutingModifierName)
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check(packet.routingHeader.len() == 0)
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(needMore, unparsed) = parse(input1[unparsed] & input1[5..8], packet)
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check(needMore)
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check(unparsed == 9..8)
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check(packet.state == ParseState.RoutingModifierValue)
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check(packet.routingHeader[0] == Modifier(op: ':', name: "_target", value: nil))
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(needMore, unparsed) = parse(input2[0..2], packet)
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check(needMore)
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check(unparsed == 3..2)
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check(packet.state == ParseState.RoutingModifierValue)
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check(packet.routingHeader[0] == Modifier(op: ':', name: "_target", value: "ali"))
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(needMore, unparsed) = parse(input2[3..5], packet)
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check(needMore)
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check(unparsed == 3..2)
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check(packet.state == ParseState.RoutingModifierName)
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check(packet.routingHeader[0] == Modifier(op: ':', name: "_target", value: "alice"))
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(needMore, unparsed) = parse(input3[0..1], packet)
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check(not needMore)
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check(unparsed == 0..1)
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check(packet.state == ParseState.ContentLength)
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(needMore, unparsed) = parse(input3[0..1], packet)
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check(needMore)
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check(unparsed == 0..1)
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check(packet.state == ParseState.ContentLength)
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check(packet.contentLength == -1)
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(needMore, unparsed) = parse(input3[unparsed] & input3[2], packet)
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check(needMore)
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check(unparsed == 3..2)
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check(packet.state == ParseState.EntityModifierName)
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check(packet.contentLength == 39)
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(needMore, unparsed) = parse(input4[0..3], packet)
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check(needMore)
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check(unparsed == 0..3)
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check(packet.state == ParseState.EntityModifierName)
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check(packet.entityHeader.len() == 0)
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(needMore, unparsed) = parse(input4[unparsed] & input4[4..7], packet)
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check(needMore)
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check(unparsed == 8..7)
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check(packet.state == ParseState.EntityModifierValue)
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check(packet.entityHeader[0] == Modifier(op: ':', name: "_hello", value: nil))
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(needMore, unparsed) = parse(input5[0..2], packet)
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check(needMore)
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check(unparsed == 3..2)
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check(packet.state == ParseState.EntityModifierValue)
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check(packet.entityHeader[0] == Modifier(op: ':', name: "_hello", value: "wor"))
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(needMore, unparsed) = parse(input5[unparsed] & input5[3..5], packet)
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check(needMore)
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check(unparsed == 3..2)
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check(packet.state == ParseState.EntityModifierName)
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check(packet.entityHeader[0] == Modifier(op: ':', name: "_hello", value: "world"))
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(needMore, unparsed) = parse(input5[unparsed] & input6[0..6], packet)
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check(not needMore)
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check(unparsed == 0..6)
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check(packet.state == ParseState.Method)
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(needMore, unparsed) = parse(input6[0..6], packet)
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check(needMore)
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check(unparsed == 0..6)
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check(packet.state == ParseState.Method)
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(needMore, unparsed) = parse(input6[unparsed] & input6[7..12], packet)
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check(needMore)
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check(unparsed == 13..12)
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check(packet.state == ParseState.Data)
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check(packet.methodName == "_hello_world")
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(needMore, unparsed) = parse(input7[0..5], packet)
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check(needMore)
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check(unparsed == 6..5)
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check(packet.state == ParseState.Data)
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check(packet.data == "Hello ")
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(needMore, unparsed) = parse(input7[6..14], packet)
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check(not needMore)
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check(unparsed == 9..8)
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check(packet.state == ParseState.Complete)
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check(packet.data == "Hello Alice!")
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echo "parser tests completed"
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