Week 3

This week was all about  coding !

What I learned this week:

• autoconf and how the configure script is generated.
• pkg-config: get the correct compiler options (instead of hard-coding values)
• LD_LIBRARY_PATH: if your library is not in a default/standard library directory (such as /usr/lib), add its path to this variable (directories separated by colon: VAR=/path1:/path2)

First prototype

I have a very first prototype of the new library. I wrote the skeleton code needed to handle HTTP/2 connections:

• Add the --enable-http2 and --with-nghttp2 options to script configure

  • MHD uses autoconf to generate the configure script (from the template configure.ac).

  • Used the --enable-https and --with-gnutls options as a code example.

  • Used code from curl and apache to check if libnghttp2 is installed.

  • Added NGHTTP2_CPPFLAGS and NGHTTP2_LDFLAGS for compiling.

  • Still not sure about the minimum version for nghttp2

  • Preprocessor variable HTTP2_SUPPORT is defined when running configure:

    ./configure --enable-http2 --with-nghttp2    
    

• Add MHD_USE_HTTP2 to enum MHD_FLAG:

  • The server accepts only HTTP2 connections (for now).
  • Support for upgrade from HTTP/1 will be added in the future.

• Connection read, idle and write callbacks:

  • Added function pointers to struct MHD_Connection:
    • ConnectionReadCallback read_cls
    • ConnectionIdleCallback idle_cls
    • ConnectionWriteCallback write_cls
  • Created functions to set the function pointers for HTTP1 and HTTP2:
    • MHD_set_connection_http1_callbacks_
    • MHD_set_connection_http2_callbacks_