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import std/deques
import std/net
import std/tables
import io/bufwriter
import io/dynstream
import io/posixstream
import loader/headers
when defined(debug):
import types/url
const LoaderBufferPageSize = 4064 # 4096 - 32
type
LoaderBufferObj = object
page*: ptr UncheckedArray[uint8]
len*: int
LoaderBuffer* = ref LoaderBufferObj
OutputHandle* = ref object
parent*: LoaderHandle
currentBuffer*: LoaderBuffer
currentBufferIdx*: int
buffers*: Deque[LoaderBuffer]
ostream*: PosixStream
istreamAtEnd*: bool
ownerPid*: int
outputId*: int
registered*: bool
suspended*: bool
dead*: bool
when defined(debug):
url*: URL
HandleParserState* = enum
hpsBeforeLines, hpsAfterFirstLine, hpsControlDone
HeaderParser* = ref object
state*: HandleParserState
lineBuffer*: string
crSeen*: bool
headers*: Headers
status*: uint16
ResponseState = enum
rsBeforeResult, rsAfterFailure, rsBeforeStatus, rsBeforeHeaders,
rsAfterHeaders
LoaderHandle* = ref object
istream*: PosixStream # stream for taking input
outputs*: seq[OutputHandle] # list of outputs to be streamed into
cacheId*: int # if cached, our ID in a client cacheMap
parser*: HeaderParser # only exists for CGI handles
rstate: ResponseState # track response state
when defined(debug):
url*: URL
{.warning[Deprecated]:off.}:
proc `=destroy`(buffer: var LoaderBufferObj) =
if buffer.page != nil:
dealloc(buffer.page)
buffer.page = nil
# for debugging
when defined(debug):
func `$`*(buffer: LoaderBuffer): string =
var s = newString(buffer.len)
copyMem(addr s[0], addr buffer.page[0], buffer.len)
return s
# Create a new loader handle, with the output stream ostream.
proc newLoaderHandle*(ostream: PosixStream; outputId, pid: int): LoaderHandle =
let handle = LoaderHandle(cacheId: -1)
handle.outputs.add(OutputHandle(
ostream: ostream,
parent: handle,
outputId: outputId,
ownerPid: pid,
suspended: true
))
return handle
proc findOutputHandle*(handle: LoaderHandle; fd: int): OutputHandle =
for output in handle.outputs:
if output.ostream.fd == fd:
return output
return nil
func cap*(buffer: LoaderBuffer): int {.inline.} =
return LoaderBufferPageSize
template isEmpty*(output: OutputHandle): bool =
output.currentBuffer == nil and not output.suspended
proc newLoaderBuffer*(): LoaderBuffer =
return LoaderBuffer(
page: cast[ptr UncheckedArray[uint8]](alloc(LoaderBufferPageSize)),
len: 0
)
proc bufferCleared*(output: OutputHandle) =
assert output.currentBuffer != nil
output.currentBufferIdx = 0
if output.buffers.len > 0:
output.currentBuffer = output.buffers.popFirst()
else:
output.currentBuffer = nil
proc tee*(outputIn: OutputHandle; ostream: PosixStream; outputId, pid: int):
OutputHandle =
assert outputIn.suspended
let output = OutputHandle(
parent: outputIn.parent,
ostream: ostream,
currentBuffer: outputIn.currentBuffer,
currentBufferIdx: outputIn.currentBufferIdx,
buffers: outputIn.buffers,
istreamAtEnd: outputIn.istreamAtEnd,
outputId: outputId,
ownerPid: pid,
suspended: outputIn.suspended
)
when defined(debug):
output.url = outputIn.url
if outputIn.parent != nil:
assert outputIn.parent.parser == nil
outputIn.parent.outputs.add(output)
return output
template output*(handle: LoaderHandle): OutputHandle =
handle.outputs[0]
proc sendResult*(handle: LoaderHandle; res: int; msg = "") =
assert handle.rstate == rsBeforeResult
inc handle.rstate
let output = handle.output
let blocking = output.ostream.blocking
output.ostream.setBlocking(true)
output.ostream.withPacketWriter w:
w.swrite(res)
if res == 0: # success
assert msg == ""
w.swrite(output.outputId)
inc handle.rstate
else: # error
w.swrite(msg)
output.ostream.setBlocking(blocking)
proc sendStatus*(handle: LoaderHandle; status: uint16) =
assert handle.rstate == rsBeforeStatus
inc handle.rstate
let blocking = handle.output.ostream.blocking
handle.output.ostream.setBlocking(true)
handle.output.ostream.withPacketWriter w:
w.swrite(status)
handle.output.ostream.setBlocking(blocking)
proc sendHeaders*(handle: LoaderHandle; headers: Headers) =
assert handle.rstate == rsBeforeHeaders
inc handle.rstate
let blocking = handle.output.ostream.blocking
handle.output.ostream.setBlocking(true)
handle.output.ostream.withPacketWriter w:
w.swrite(headers)
handle.output.ostream.setBlocking(blocking)
proc recvData*(ps: PosixStream; buffer: LoaderBuffer): int {.inline.} =
let n = ps.recvData(addr buffer.page[0], buffer.cap)
buffer.len = n
return n
proc sendData*(ps: PosixStream; buffer: LoaderBuffer; si = 0): int {.inline.} =
assert buffer.len - si > 0
return ps.sendData(addr buffer.page[si], buffer.len - si)
proc iclose*(handle: LoaderHandle) =
if handle.istream != nil:
if handle.rstate notin {rsBeforeResult, rsAfterFailure, rsAfterHeaders}:
assert handle.outputs.len == 1
# not an ideal solution, but better than silently eating malformed
# headers
try:
if handle.rstate == rsBeforeStatus:
handle.sendStatus(500)
if handle.rstate == rsBeforeHeaders:
handle.sendHeaders(newHeaders())
handle.output.ostream.setBlocking(true)
const msg = "Error: malformed header in CGI script"
discard handle.output.ostream.sendData(msg)
except ErrorBrokenPipe:
discard # receiver is dead
handle.istream.sclose()
handle.istream = nil
proc oclose*(output: OutputHandle) =
output.ostream.sclose()
output.ostream = nil
proc close*(handle: LoaderHandle) =
handle.iclose()
for output in handle.outputs:
assert not output.registered
if output.ostream != nil:
output.oclose()
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