datachannel-sys 0.18.0

Native bindings to libdatachannel.
Documentation 
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use std::env;
use std::path::PathBuf;

#[allow(dead_code)]
fn env_var_rerun(name: &str) -> Result<String, env::VarError> {
    println!("cargo:rerun-if-env-changed={}", name);
    env::var(name)
}

#[cfg(feature = "vendored")]
pub fn build_and_get_openssl() -> PathBuf {
    let artifacts = openssl_src::Build::new().build();
    artifacts.lib_dir().parent().unwrap().to_path_buf()
}

fn main() {
    let out_dir = env::var("OUT_DIR").unwrap();

    #[cfg(feature = "vendored")]
    {
        let mut config = cmake::Config::new("libdatachannel");
        config.build_target("datachannel-static");
        config.out_dir(&out_dir);

        config.define("NO_WEBSOCKET", "ON");
        config.define("NO_EXAMPLES", "ON");

        if !cfg!(feature = "media") {
            config.define("NO_MEDIA", "ON");
        }

        config.define("OPENSSL_ROOT_DIR", build_and_get_openssl());
        config.define("OPENSSL_USE_STATIC_LIBS", "TRUE");

        config.build();
    }

    ////////////////////////////////////////////////////////////////////////////////////

    let mut config = cmake::Config::new("libdatachannel");
    config.out_dir(&out_dir);
    config.define("NO_WEBSOCKET", "ON");
    config.define("NO_EXAMPLES", "ON");

    if !cfg!(feature = "media") {
        config.define("NO_MEDIA", "ON");
    }

    #[cfg(not(feature = "vendored"))]
    {
        if let Ok(openssl_root_dir) = env_var_rerun("OPENSSL_ROOT_DIR") {
            config.define("OPENSSL_ROOT_DIR", openssl_root_dir);
        }
        if let Ok(openssl_libraries) = env_var_rerun("OPENSSL_LIBRARIES") {
            config.define("OPENSSL_LIBRARIES", openssl_libraries);
        }
    }

    config.build();

    ////////////////////////////////////////////////////////////////////////////////////

    if cfg!(feature = "vendored") {
        let profile = config.get_profile();

        // Link static libc++
        #[cfg(feature = "vendored")]
        cpp_build::Config::new()
            .include(format!("{}/lib", out_dir))
            .build("src/lib.rs");

        // Link static openssl
        if cfg!(target_env = "msvc") {
            println!("cargo:rustc-link-lib=static=libcrypto");
            println!("cargo:rustc-link-lib=static=libssl");
        } else {
            println!("cargo:rustc-link-lib=static=crypto");
            println!("cargo:rustc-link-lib=static=ssl");
        }

        // Link static libjuice
        if cfg!(target_env = "msvc") {
            println!(
                "cargo:rustc-link-search=native={}/build/deps/libjuice/{}",
                out_dir, profile
            );
        } else {
            println!(
                "cargo:rustc-link-search=native={}/build/deps/libjuice",
                out_dir
            );
        }
        println!("cargo:rustc-link-lib=static=juice-static");

        // Link static usrsctplib
        if cfg!(target_env = "msvc") {
            println!(
                "cargo:rustc-link-search=native={}/build/deps/usrsctp/usrsctplib/{}",
                out_dir, profile
            );
        } else {
            println!(
                "cargo:rustc-link-search=native={}/build/deps/usrsctp/usrsctplib",
                out_dir
            );
        }
        println!("cargo:rustc-link-lib=static=usrsctp");

        if cfg!(feature = "media") {
            // Link static libsrtp
            if cfg!(target_env = "msvc") {
                println!(
                    "cargo:rustc-link-search=native={}/build/deps/libsrtp/{}",
                    out_dir, profile
                );
            } else {
                println!(
                    "cargo:rustc-link-search=native={}/build/deps/libsrtp",
                    out_dir
                );
            }
            println!("cargo:rustc-link-lib=static=srtp2");
        }

        // Link static libdatachannel
        if cfg!(target_env = "msvc") {
            println!(
                "cargo:rustc-link-search=native={}/build/{}",
                out_dir, profile
            );
        } else {
            println!("cargo:rustc-link-search=native={}/build", out_dir);
        }
        println!("cargo:rustc-link-lib=static=datachannel-static");
    } else {
        // Link dynamic libdatachannel
        println!("cargo:rustc-link-search=native={}/lib", out_dir);
        println!("cargo:rustc-link-lib=dylib=datachannel");
    }

    let bindings = bindgen::Builder::default()
        .header(format!("{}/include/rtc/rtc.h", out_dir))
        .generate()
        .expect("Unable to generate bindings");

    let out_path = PathBuf::from(out_dir);
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings");
}