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Option to allow the request body to be processed outside the asynchttpserver library. #13147

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merged 12 commits into from
Feb 4, 2020
Merged

Option to allow the request body to be processed outside the asynchttpserver library. #13147

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4fdbf8f
llow the request body to be processed outside the asynchttpserver lib…
mrhdias Jan 14, 2020
36e708f
Minor fix suggested by Araq
mrhdias Jan 14, 2020
6437c7a
No "req.contentLength" required.
mrhdias Jan 15, 2020
5c8dbf0
Now, request body is a FutureStream
mrhdias Jan 29, 2020
f458d0c
Update lib/pure/asynchttpserver.nim
mrhdias Jan 30, 2020
83cc79c
Added the modifications suggested by Araq.
mrhdias Jan 30, 2020
c110f90
The ".since" annotation has been added.
mrhdias Feb 3, 2020
a8ac8a5
The Error: invalid pragma: since: (1, 1) has been fixed.
mrhdias Feb 3, 2020
2dfcae4
The ".since" pragma has been removed from the code.
mrhdias Feb 4, 2020
dbc527e
Checking versions for compatibility.
mrhdias Feb 4, 2020
7ca4441
Added a entry in library changes for asynchttpserver.
mrhdias Feb 4, 2020
e5a2aed
The default value of chunkSize was increased to 8*1024.
mrhdias Feb 4, 2020
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39 changes: 37 additions & 2 deletions lib/pure/asynchttpserver.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -30,13 +30,16 @@
##
## waitFor server.serve(Port(8080), cb)

include "system/inclrtl"

import tables, asyncnet, asyncdispatch, parseutils, uri, strutils
import httpcore

export httpcore except parseHeader

const
maxLine = 8*1024
chunkSize = 1048

# TODO: If it turns out that the decisions that asynchttpserver makes
# explicitly, about whether to close the client sockets or upgrade them are
Expand All @@ -52,6 +55,7 @@ type
url*: Uri
hostname*: string ## The hostname of the client that made the request.
body*: string
bodyStream*: FutureStream[string]
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when (NimMajor, NimMinor) >= (1, 1):
  bodyStream*: FutureStream[string]

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when (NimMajor, NimMinor) >= (1, 1):
  bodyStream*: FutureStream[string]

When I put the annotation I get this error:
Error: constant expression expected

type
  Request* = object
    client*: AsyncSocket # TODO: Separate this into a Response object?
    reqMethod*: HttpMethod
    headers*: HttpHeaders
    protocol*: tuple[orig: string, major, minor: int]
    url*: Uri
    hostname*: string    ## The hostname of the client that made the request.
    body*: string
    when (NimMajor, NimMinor) >= (1, 1):
      bodyStream*: FutureStream[string]

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Bah, what's up with that...

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Works if outside of type declaration

when (NimMajor, NimMinor) >= (1, 1):
  const
    maxLine = 8*1024
    chunkSize = 1048

  type
    Request* = object
      client*: AsyncSocket # TODO: Separate this into a Response object?
      reqMethod*: HttpMethod
      headers*: HttpHeaders
      protocol*: tuple[orig: string, major, minor: int]
      url*: Uri
      hostname*: string    ## The hostname of the client that made the request.
      body*: string
      bodyStream*: FutureStream[string] # <<<<<
else:
  const
    maxLine = 8*1024

  type
    Request* = object
      client*: AsyncSocket # TODO: Separate this into a Response object?
      reqMethod*: HttpMethod
      headers*: HttpHeaders
      protocol*: tuple[orig: string, major, minor: int]
      url*: Uri
      hostname*: string    ## The hostname of the client that made the request.
      body*: string

type
  AsyncHttpServer* = ref object
    socket: AsyncSocket
    reuseAddr: bool
    reusePort: bool
    maxBody: int ## The maximum content-length that will be read for the body.


AsyncHttpServer* = ref object
socket: AsyncSocket
Expand Down Expand Up @@ -128,6 +132,31 @@ proc parseProtocol(protocol: string): tuple[orig: string, major, minor: int] =
proc sendStatus(client: AsyncSocket, status: string): Future[void] =
client.send("HTTP/1.1 " & status & "\c\L\c\L")

proc readBody(
req: FutureVar[Request],
contentLength: int
): Future[bool] {.since: (1, 1), async.} =

var remainder = contentLength
while remainder > 0:
let readSize = min(remainder, chunkSize)
let data = await req.mget().client.recv(read_size)
if data.len != read_size:
return true
await req.mget().bodyStream.write(data)
remainder -= data.len

req.mget().bodyStream.complete()
return false

proc readBody(
req: FutureVar[Request],
contentLength: int
): Future[bool] {.async.} =

req.mget().body = await req.mget().client.recv(contentLength)
return if req.mget().body.len == contentLength: false else: true

proc processRequest(
server: AsyncHttpServer,
req: FutureVar[Request],
Expand All @@ -149,6 +178,7 @@ proc processRequest(
request.hostname.shallowCopy(address)
assert client != nil
request.client = client
request.bodyStream = newFutureStream[string]()

# We should skip at least one empty line before the request
# https://tools.ietf.org/html/rfc7230#section-3.5
Expand Down Expand Up @@ -243,10 +273,15 @@ proc processRequest(
if contentLength > server.maxBody:
await request.respondError(Http413)
return false
request.body = await client.recv(contentLength)
if request.body.len != contentLength:
if await req.readBody(contentLength):
await request.respond(Http400, "Bad Request. Content-Length does not match actual.")
return true

## request.body = await client.recv(contentLength)
## if request.body.len != contentLength:
## await request.respond(Http400, "Bad Request. Content-Length does not match actual.")
## return true
elif request.reqMethod == HttpPost:
await request.respond(Http411, "Content-Length required.")
return true
Expand Down