nimforum mirror - Help binding the nghttp2 to something consumable by Nim!

mrhdias (orginal) [2020-02-09T19:38:37+01:00] view original

Nim don't have a library that support http/2 protocol. I found this library and it already has a python binding.

https://github.com/nghttp2/nghttp2

Any ideas on how to achieve this for Nim?

shashlick (orginal) [2020-02-09T19:53:22+01:00] view original

Nimterop should work for wrapping this including building the library with cmake. Give it a try.

mrhdias (orginal) [2020-02-09T22:32:36+01:00] view original

Thank @shashlick I will give it a try. But, my first approach was to use the c2nim and it works well.

But, when I import the library it gives the following error:

/home/hdias/test/nghttp2/nghttp2.nim(29, 16) Error: invalid token: _ (\95)

##  Define WIN32 when build target is Win32 API (borrowed from
##    libcurl)

when (defined(_WIN32) or defined(__WIN32__)) and not defined(WIN32): <<< line 29
  const
    WIN32* = true
##  Compatibility for non-Clang compilers

when not defined(__has_declspec_attribute):
  template __has_declspec_attribute*(x: untyped): untyped =
    0

when defined(_MSC_VER) and (_MSC_VER < 1800):
  ##  MSVC < 2013 does not have inttypes.h because it is not C99
  ##    compliant.  See compiler macros and version number in
  ##    https://sourceforge.net/p/predef/wiki/Compilers/
else:
when defined(NGHTTP2_STATICLIB):
  const
    NGHTTP2_EXTERN* = true
elif defined(WIN32) or
    (__has_declspec_attribute(dllexport) and
    __has_declspec_attribute(dllimport)):
  when defined(BUILDING_NGHTTP2):
    const
      NGHTTP2_EXTERN* = __declspec(dllexport)
  else:
    const
      NGHTTP2_EXTERN* = __declspec(dllimport)
else:
  when defined(BUILDING_NGHTTP2):
    const
      NGHTTP2_EXTERN* = __attribute__((visibility("default")))
  else:
    const
      NGHTTP2_EXTERN* = true
## *

Any idea how to fix this?

shashlick (orginal) [2020-02-12T06:14:16+01:00] view original

Here's a working wrapper for nghttp2. It will download the code from github, build it with cmake/make or configure/make and link the lib. You can pick static or dynamic linking.

To compile and link dynamically: nim c -d:nghttp2Git nghttp2.nim

To statically link add: -d:nghttp2Static

To pick a specific git tag: -d:nghttp2SetVer=v1.40.0

import os

import nimterop/[build, cimport]

const
  baseDir = currentSourcePath.parentDir() / "nghttp2Lib"

getHeader(
  header = "nghttp2.h",
  giturl = "https://github.com/nghttp2/nghttp2",
  outdir = baseDir,
  cmakeFlags = "-DENABLE_LIB_ONLY=ON -DENABLE_STATIC_LIB=ON",
  conFlags = "--enable-lib-only"
)

static:
  cDebug()
  cSkipSymbol(@["NGHTTP2_PROTO_ALPN"])

cIncludeDir(baseDir / "buildcache" / "lib" / "includes")

when isDefined(nghttp2Static):
  cImport(nghttp2Path)
else:
  cImport(nghttp2Path, dynlib="nghttp2LPath")

I have only tested on Linux but it should work cross-platform if nghttp2 compiles smoothly on those platforms.

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5907 :: Help binding the nghttp2 to something consumable by Nim!