#!/usr/bin/env bash
# -----------------------------------------------------------------------------
# Builds and installs all tools needed for developing and testing P4 support in
# ONOS.
#
# Tested on Ubuntu 14.04, 16.04 and 18.04.
#
# Recommended minimum system requirements:
# 4 GB of RAM
# 2 cores
# 8 GB free hard drive space (~4 GB to build everything)
#
# To execute up to a given step, pass the step name as the first argument. For
# example, to install PI, but not BMv2, p4c, etc:
#   ./install-p4-tools.sh PI
# -----------------------------------------------------------------------------

# Exit on errors.
set -e

BUILD_DIR=~/p4tools
# in case BMV2_COMMIT value is updated, the same variable in
# protocols/bmv2/thrift-api/BUCK file should also be updated
BMV2_COMMIT="ae87b4d4523488ac935133b4aef437796ad1bbd1"
PI_COMMIT="539e4624f16aac39f8890a6dfb11c65040e735ad"
P4C_COMMIT="380830f6c26135d1d65e1312e3ba2da628c18145"
PROTOBUF_COMMIT="tags/v3.2.0"
GRPC_COMMIT="tags/v1.3.2"
LIBYANG_COMMIT="v0.14-r1"
SYSREPO_COMMIT="v0.7.2"

NUM_CORES=`grep -c ^processor /proc/cpuinfo`

# If false, build tools without debug features to improve throughput of BMv2 and
# reduce CPU/memory footprint. Default is true.
DEBUG_FLAGS=${DEBUG_FLAGS:-true}

# Execute up to the given step (first argument), or all if not defined.
LAST_STEP=${1:-all}

function do_requirements {
    sudo apt update
    sudo apt-get install -y --no-install-recommends \
        autoconf \
        automake \
        bison \
        build-essential \
        cmake \
        cpp \
        curl \
        flex \
        git \
        graphviz \
        libavl-dev \
        libboost-dev \
        libboost-graph-dev \
        libboost-program-options-dev \
        libboost-system-dev \
        libboost-filesystem-dev \
        libboost-thread-dev \
        libboost-filesystem-dev \
        libboost-program-options-dev \
        libboost-system-dev \
        libboost-test-dev \
        libboost-thread-dev \
        libc6-dev \
        libev-dev \
        libevent-dev \
        libffi-dev \
        libfl-dev \
        libgc-dev \
        libgc1c2 \
        libgflags-dev \
        libgmp-dev \
        libgmp10 \
        libgmpxx4ldbl \
        libjudy-dev \
        libpcap-dev \
        libpcre3-dev \
        libssl-dev \
        libtool \
        make \
        pkg-config \
        protobuf-c-compiler \
        python2.7 \
        python2.7-dev \
        tcpdump \
        wget \
        unzip

    sudo -H pip install setuptools cffi ipaddr ipaddress pypcap
}

function do_requirements_1404 {
    sudo apt install -y python-software-properties software-properties-common
    sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
    sudo add-apt-repository -y ppa:george-edison55/cmake-3.x
    sudo apt update
    sudo apt install -y \
        dpkg-dev \
        g++-4.9 \
        gcc-4.9 \
        cmake \
        libbz2-dev \
        libreadline6 \
        libreadline6-dev \
        mktemp

    # Needed for p4c.
    sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 50
    sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 50

    if [ -z "$(ldconfig -p | grep libboost_iostreams.so.1.58.0)"  ]; then
        do_boost
    fi
}

function do_requirements_1604 {
    sudo apt-get update
    sudo apt-get install -y --no-install-recommends \
        ca-certificates \
        g++ \
        libboost-iostreams1.58-dev \
        libprotobuf-c-dev \
        libreadline6 \
        libreadline6-dev \
        mktemp
}

function do_requirements_1804 {
    sudo apt-get update
    sudo apt-get install -y --no-install-recommends \
        ca-certificates \
        g++ \
        libboost1.65-dev \
        libboost-regex1.65-dev \
        libboost-iostreams1.65-dev \
        libreadline-dev \
        libssl1.0-dev \
        libprotobuf-c-dev
}

function do_boost {
    cd ${BUILD_DIR}
    wget https://sourceforge.net/projects/boost/files/boost/1.58.0/boost_1_58_0.tar.bz2/download -O boost_1_58_0.tar.bz2
    tar --bzip2 -xf boost_1_58_0.tar.bz2
    cd boost_1_58_0

    ./bootstrap.sh --with-libraries=iostreams
    sudo ./b2 install
    sudo ldconfig

    cd ..
    sudo rm -rf boost_1_58_0
}

function do_protobuf-c {
    cd ${BUILD_DIR}
    git clone https://github.com/protobuf-c/protobuf-c.git
    cd protobuf-c

    ./autogen.sh
    ./configure --prefix=/usr
    make -j${NUM_CORES}
    sudo make install
    sudo ldconfig

    cd ..
    sudo rm -rf protobuf-c
}

function do_protobuf {
    cd ${BUILD_DIR}
    if [ ! -d protobuf ]; then
      git clone https://github.com/google/protobuf.git
    fi
    cd protobuf
    git fetch
    git checkout ${PROTOBUF_COMMIT}

    export CFLAGS="-Os"
    export CXXFLAGS="-Os"
    export LDFLAGS="-Wl,-s"
    ./autogen.sh
    ./configure --prefix=/usr
    make -j${NUM_CORES}
    sudo make install
    sudo ldconfig
    unset CFLAGS CXXFLAGS LDFLAGS

    cd python
    sudo python setup.py install --cpp_implementation
}

function do_grpc {
    cd ${BUILD_DIR}
    if [ ! -d grpc ]; then
      git clone https://github.com/grpc/grpc.git
    fi
    cd grpc
    git fetch
    git checkout ${GRPC_COMMIT}
    git submodule update --init

    export LDFLAGS="-Wl,-s"
    RELEASE=`lsb_release -rs`
    if version_ge $RELEASE 18.04; then
       # Ubuntu 18.04 ships OpenSSL 1.1 by default, which has breaking changes in the API.
       # Here, we will build grpc with OpenSSL 1.0.
       # (Reference: https://github.com/grpc/grpc/issues/10589)
       # Also, set CFLAGS to avoid compilcation error caused by gcc7.
       # (Reference: https://github.com/grpc/grpc/issues/13854)
       PKG_CONFIG_PATH=/usr/lib/openssl-1.0/pkgconfig make -j${NUM_CORES} CFLAGS='-Wno-error'
    else
       make -j${NUM_CORES}
    fi
    sudo make install
    sudo ldconfig
    unset LDFLAGS

    sudo pip install -r requirements.txt
    sudo pip install .
}

function do_libyang {
    cd ${BUILD_DIR}
    if [ ! -d libyang ]; then
      git clone https://github.com/CESNET/libyang.git
    fi
    cd libyang
    git fetch
    git checkout ${LIBYANG_COMMIT}

    mkdir -p build
    cd build
    cmake ..
    make -j${NUM_CORES}
    sudo make install
    sudo ldconfig
}

function do_sysrepo_deps {
    RELEASE=`lsb_release -rs`
    if version_ge $RELEASE 14.04 && [ -z "$(ldconfig -p | grep libprotobuf-c)"  ]; then
        do_protobuf-c
    fi
}

function do_sysrepo {
    do_sysrepo_deps

    cd ${BUILD_DIR}
    if [ ! -d sysrepo ]; then
      git clone https://github.com/sysrepo/sysrepo.git
    fi
    cd sysrepo
    git fetch
    git checkout ${SYSREPO_COMMIT}

    mkdir -p build
    cd build
    cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_EXAMPLES=Off \
        -DCALL_TARGET_BINS_DIRECTLY=Off ..
    make -j${NUM_CORES}
    sudo make install
    sudo ldconfig
}

function checkout_bmv2 {
    cd ${BUILD_DIR}
    if [ ! -d bmv2 ]; then
        git clone https://github.com/p4lang/behavioral-model.git bmv2
    fi
    cd bmv2
    git fetch
    git checkout ${BMV2_COMMIT}
}

function do_pi_bmv2_deps {
    checkout_bmv2
    # From bmv2's install_deps.sh.
    # Nanomsg is required also by PI.
    tmpdir=`mktemp -d -p .`
    cd ${tmpdir}
    bash ../travis/install-thrift.sh
    bash ../travis/install-nanomsg.sh
    sudo ldconfig
    bash ../travis/install-nnpy.sh
    cd ..
    sudo rm -rf $tmpdir
}

function do_PI {
    cd ${BUILD_DIR}
    if [ ! -d PI ]; then
        git clone https://github.com/p4lang/PI.git
    fi
    cd PI
    git fetch
    git checkout ${PI_COMMIT}
    git submodule update --init --recursive

    ./autogen.sh
    # FIXME: re-enable --with-sysrepo when gNMI support becomes more stable
    # ./configure --with-proto --with-sysrepo
    ./configure --with-proto --without-internal-rpc --without-cli
    make -j${NUM_CORES}
    sudo make install
    sudo ldconfig

    # FIXME: re-enable when gNMI support becomes more stable
    # sudo proto/sysrepo/install_yangs.sh
}

function do_bmv2 {
    checkout_bmv2

    ./autogen.sh
    if [ "${DEBUG_FLAGS}" = true ] ; then
        ./configure --with-pi --disable-elogger --without-nanomsg
    else
        ./configure --with-pi --disable-elogger --without-nanomsg --disable-logging-macros
    fi
    make -j${NUM_CORES}
    sudo make install
    sudo ldconfig

    # Simple_switch_grpc target
    cd targets/simple_switch_grpc
    ./autogen.sh
    ./configure --with-thrift
    # FIXME: re-enable --with-sysrepo when gNMI support becomes more stable
    # ./configure --with-sysrepo --with-thrift
    make -j${NUM_CORES}
    sudo make install
    sudo ldconfig
}

function do_p4c {
    cd ${BUILD_DIR}
    if [ ! -d p4c ]; then
        git clone https://github.com/p4lang/p4c.git
    fi
    cd p4c
    git fetch
    git checkout ${P4C_COMMIT}
    git submodule update --init --recursive

    mkdir -p build
    cd build
    cmake .. -DENABLE_EBPF=OFF
    make -j${NUM_CORES}
    sudo make install
    sudo ldconfig
}

function do_scapy-vxlan {
    cd ${BUILD_DIR}
    if [ ! -d scapy-vxlan ]; then
        git clone https://github.com/p4lang/scapy-vxlan.git
    fi
    cd scapy-vxlan

    git pull origin master

    sudo python setup.py install
}

function do_ptf {
    cd ${BUILD_DIR}
    if [ ! -d ptf ]; then
        git clone https://github.com/p4lang/ptf.git
    fi
    cd ptf
    git pull origin master

    sudo python setup.py install
}

function check_commit {
    if [ ! -e $2 ]; then
        return 0 # true
    fi
    if [[ $(< $2) != "$1" ]]; then
        return 0 # true
    fi
    return 1 # false
}

# The following is borrowed from Mininet's util/install.sh
function version_ge {
    # sort -V sorts by *version number*
    latest=`printf "$1\n$2" | sort -V | tail -1`
    # If $1 is latest version, then $1 >= $2
    [ "$1" == "$latest" ]
}

MUST_DO_ALL=false
DID_REQUIREMENTS=false
function check_and_do {
    # Check if the latest built commit is the same we are trying to build now,
    # or if all projects must be built. If true builds this project.
    commit_id="$1"
    proj_dir="$2"
    func_name="$3"
    step_name="$4"
    commit_file=${BUILD_DIR}/${proj_dir}/.last_built_commit_${step_name}
    if [ ${MUST_DO_ALL} = true ] \
        || check_commit ${commit_id} ${commit_file}; then
        echo "#"
        echo "# Building ${step_name} (${commit_id})"
        echo "#"
        # Print commands used to install to aid debugging
        set -x
        if ! ${DID_REQUIREMENTS} = true; then
            do_requirements
            # TODO consider other Linux distros; presently this script assumes
            # that it is running on Ubuntu.
            RELEASE=`lsb_release -rs`
            if version_ge $RELEASE 18.04; then
                do_requirements_1804
            elif version_ge $RELEASE 16.04; then
                do_requirements_1604
            elif version_ge $RELEASE 14.04; then
                do_requirements_1404
            else
                echo "Ubuntu version $RELEASE is not supported"
                exit 1
            fi
            DID_REQUIREMENTS=true
        fi
        eval ${func_name}
        echo ${commit_id} > ${commit_file}
        # Build all next projects as they might depend on this one.
        MUST_DO_ALL=true
        # Disable printing to reduce output
        set +x
    else
        echo "${step_name} is up to date (commit ${commit_id})"
    fi
    # Exit if last step.
    if [ ${step_name} = ${LAST_STEP} ]; then
        exit
    fi
}

mkdir -p ${BUILD_DIR}
cd ${BUILD_DIR}
# In dependency order.
check_and_do ${PROTOBUF_COMMIT} protobuf do_protobuf protobuf
check_and_do ${GRPC_COMMIT} grpc do_grpc grpc
# FIXME: re-enable when gNMI support becomes more stable
# check_and_do ${LIBYANG_COMMIT} libyang do_libyang libyang
# check_and_do ${SYSREPO_COMMIT} sysrepo do_sysrepo sysrepo
check_and_do ${BMV2_COMMIT} bmv2 do_pi_bmv2_deps bmv2-deps
check_and_do ${PI_COMMIT} PI do_PI PI
check_and_do ${BMV2_COMMIT} bmv2 do_bmv2 bmv2
check_and_do ${P4C_COMMIT} p4c do_p4c p4c
check_and_do master scapy-vxlan do_scapy-vxlan scapy-vxlan
check_and_do master ptf do_ptf ptf

echo "Done!"