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# Write data to streams in packets.
# Each packet is prefixed with its length as a pointer-sized integer.
import std/options
import std/sets
import std/tables
import io/dynstream
import types/blob
import types/formdata
import types/url
import types/opt
type BufferedWriter* = object
stream: DynStream
buffer: ptr UncheckedArray[uint8]
bufSize: int
bufLen: int
writeLen: bool
{.warning[Deprecated]: off.}:
proc `=destroy`(writer: var BufferedWriter) =
if writer.buffer != nil:
dealloc(writer.buffer)
writer.buffer = nil
proc initWriter*(stream: DynStream; sizeInit = 64; writeLen = false):
BufferedWriter =
var w = BufferedWriter(
stream: stream,
buffer: cast[ptr UncheckedArray[uint8]](alloc(sizeInit)),
bufSize: sizeInit,
bufLen: 0,
writeLen: writeLen
)
if writeLen: # add space for `len'
w.bufLen += sizeof(w.bufLen)
assert w.bufLen < sizeInit
return w
proc flush*(writer: var BufferedWriter) =
if writer.writeLen:
# subtract the length field's size
var realLen = writer.bufLen - sizeof(writer.bufLen)
copyMem(writer.buffer, addr realLen, sizeof(writer.bufLen))
writer.stream.sendDataLoop(writer.buffer, writer.bufLen)
writer.bufLen = 0
writer.stream.sflush()
proc deinit*(writer: var BufferedWriter) =
dealloc(writer.buffer)
writer.buffer = nil
writer.bufSize = 0
writer.bufLen = 0
template withPacketWriter*(stream: DynStream; w, body: untyped) =
block:
var w = stream.initWriter(writeLen = true)
body
w.flush()
w.deinit()
proc swrite*(writer: var BufferedWriter; n: SomeNumber)
proc swrite*[T](writer: var BufferedWriter; s: set[T])
proc swrite*[T: enum](writer: var BufferedWriter; x: T)
proc swrite*(writer: var BufferedWriter; s: string)
proc swrite*(writer: var BufferedWriter; b: bool)
proc swrite*(writer: var BufferedWriter; url: URL)
proc swrite*(writer: var BufferedWriter; tup: tuple)
proc swrite*[I, T](writer: var BufferedWriter; a: array[I, T])
proc swrite*(writer: var BufferedWriter; s: seq)
proc swrite*[U, V](writer: var BufferedWriter; t: Table[U, V])
proc swrite*(writer: var BufferedWriter; obj: object)
proc swrite*(writer: var BufferedWriter; obj: ref object)
proc swrite*(writer: var BufferedWriter; part: FormDataEntry)
proc swrite*(writer: var BufferedWriter; blob: Blob)
proc swrite*[T](writer: var BufferedWriter; o: Option[T])
proc swrite*[T, E](writer: var BufferedWriter; o: Result[T, E])
proc writeData(writer: var BufferedWriter; buffer: pointer; len: int) =
let targetLen = writer.bufLen + len
let missing = targetLen - writer.bufSize
if missing > 0:
let target = writer.bufSize + missing
writer.bufSize *= 2
if writer.bufSize < target:
writer.bufSize = target
let p = realloc(writer.buffer, writer.bufSize)
writer.buffer = cast[ptr UncheckedArray[uint8]](p)
copyMem(addr writer.buffer[writer.bufLen], buffer, len)
writer.bufLen = targetLen
proc swrite*(writer: var BufferedWriter; n: SomeNumber) =
writer.writeData(unsafeAddr n, sizeof(n))
proc swrite*[T: enum](writer: var BufferedWriter; x: T) =
static:
doAssert sizeof(int) >= sizeof(T)
writer.swrite(int(x))
proc swrite*[T](writer: var BufferedWriter; s: set[T]) =
writer.swrite(s.card)
for e in s:
writer.swrite(e)
proc swrite*(writer: var BufferedWriter; s: string) =
writer.swrite(s.len)
if s.len > 0:
writer.writeData(unsafeAddr s[0], s.len)
proc swrite*(writer: var BufferedWriter; b: bool) =
if b:
writer.swrite(1u8)
else:
writer.swrite(0u8)
proc swrite*(writer: var BufferedWriter; url: URL) =
if url != nil:
writer.swrite(url.serialize())
else:
writer.swrite("")
proc swrite*(writer: var BufferedWriter; tup: tuple) =
for f in tup.fields:
writer.swrite(f)
proc swrite*[I, T](writer: var BufferedWriter; a: array[I, T]) =
for x in a:
writer.swrite(x)
proc swrite*(writer: var BufferedWriter; s: seq) =
writer.swrite(s.len)
for x in s:
writer.swrite(x)
proc swrite*[U, V](writer: var BufferedWriter; t: Table[U, V]) =
writer.swrite(t.len)
for k, v in t:
writer.swrite(k)
writer.swrite(v)
proc swrite*(writer: var BufferedWriter; obj: object) =
for f in obj.fields:
writer.swrite(f)
proc swrite*(writer: var BufferedWriter; obj: ref object) =
writer.swrite(obj != nil)
if obj != nil:
writer.swrite(obj[])
proc swrite*(writer: var BufferedWriter; part: FormDataEntry) =
writer.swrite(part.isstr)
writer.swrite(part.name)
writer.swrite(part.filename)
if part.isstr:
writer.swrite(part.svalue)
else:
writer.swrite(part.value)
#TODO clean up this mess
proc swrite*(writer: var BufferedWriter; blob: Blob) =
writer.swrite(blob.isfile)
if blob.isfile:
writer.swrite(WebFile(blob).path)
else:
writer.swrite(blob.ctype)
writer.swrite(blob.size)
writer.writeData(blob.buffer, int(blob.size))
proc swrite*[T](writer: var BufferedWriter; o: Option[T]) =
writer.swrite(o.isSome)
if o.isSome:
writer.swrite(o.get)
proc swrite*[T, E](writer: var BufferedWriter; o: Result[T, E]) =
writer.swrite(o.isOk)
if o.isOk:
when not (T is void):
writer.swrite(o.get)
else:
when not (E is void):
writer.swrite(o.error)
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