echo "=====> sourcing common.funcs"

prepare_homedir() {
    echo "=====> prepare_homedir"
    # ln -s "$(pwd)" "/home/${ADMIN_USERNAME}/script-dir"
    cd "/home/${ADMIN_USERNAME}"
    echo "Now changed directory to: $(pwd)"
    mkdir -p logs
    mkdir -p logs/old
    echo "<===== prepare_homedir"
}

increase_ulimit_n() {
     echo "${ADMIN_USERNAME} soft nofile 100000" | sudo tee /etc/security/limits.conf >> /dev/null
     echo "${ADMIN_USERNAME} hard nofile 100000" | sudo tee /etc/security/limits.conf >> /dev/null
}

install_ntpd() {
    echo "=====> install_ntpd"
    sudo timedatectl set-ntp no
    sudo apt-get -y install ntp

    sudo bash -c "cat > /etc/cron.hourly/ntpdate << EOF
#!/bin/sh
sudo service ntp stop
sudo ntpdate -s ntp.ubuntu.com
sudo service ntp start
EOF"
    sudo chmod 755 /etc/cron.hourly/ntpdate
    echo "<===== install_ntpd"
}

install_haveged() {
    echo "=====> install_haveged"
    sudo apt-get -y install haveged
    sudo update-rc.d haveged defaults
    echo "<===== install_haveged"
}

allocate_swap() {
    echo "=====> allocate_swap"
    sudo apt-get -y install bc
    #sudo fallocate -l $(echo "$(free -b | awk '/Mem/{ print $2 }')*2"  | bc -l) /swapfile
    sudo fallocate -l 1G /swapfile
    sudo chmod 600 /swapfile
    sudo mkswap /swapfile
    sudo swapon /swapfile
    sudo sh -c "printf '/swapfile   none    swap    sw    0   0\n' >> /etc/fstab"
    sudo sh -c "printf 'vm.swappiness=10\n' >> /etc/sysctl.conf"
    sudo sysctl vm.vfs_cache_pressure=50
    sudo sh -c "printf 'vm.vfs_cache_pressure = 50\n' >> /etc/sysctl.conf"
    echo "<===== allocate_swap"
}

install_nodejs() {
    echo "=====> install_nodejs"
    curl -sL ${NODE_SOURCE_DEB} | sudo -E bash -
    sudo apt-get update
    sudo apt-get install -y build-essential git unzip wget nodejs ntp cloud-utils

    # add symlink if it doesn't exist
    [[ ! -f /usr/bin/node ]] && sudo ln -s /usr/bin/nodejs /usr/bin/node
    echo "<===== install_nodejs"
}

start_pm2_via_systemd() {
    echo "=====> start_pm2_via_systemd"
    sudo npm install pm2 -g
    sudo bash -c "cat > /etc/systemd/system/oracles-pm2.service <<EOF
[Unit]
Description=oracles pm2 service
After=network.target
[Service]
Type=oneshot
RemainAfterExit=true
User=${ADMIN_USERNAME}
Group=${ADMIN_USERNAME}
Environment=MYVAR=myval
WorkingDirectory=/home/${ADMIN_USERNAME}
ExecStart=/usr/bin/pm2 ping
[Install]
WantedBy=multi-user.target
EOF"
    sudo systemctl enable oracles-pm2
    sudo systemctl start oracles-pm2
    echo "<===== start_pm2_via_systemd"
}

# based on https://get.parity.io
install_netstats_via_systemd() {
    echo "=====> install_netstats_via_systemd"
    git clone https://github.com/oraclesorg/eth-net-intelligence-api
    cd eth-net-intelligence-api
    #sed -i '/"web3"/c "web3": "0.19.x",' package.json
    npm install

    cat > app.json << EOL
[
    {
        "name"                 : "netstats_daemon",
        "script"               : "app.js",
        "log_date_format"      : "YYYY-MM-DD HH:mm:SS Z",
        "error_file"           : "/home/${ADMIN_USERNAME}/logs/netstats_daemon.err",
        "out_file"             : "/home/${ADMIN_USERNAME}/logs/netstats_daemon.out",
        "merge_logs"           : false,
        "watch"                : false,
        "max_restarts"         : 100,
        "exec_interpreter"     : "node",
        "exec_mode"            : "fork_mode",
        "env":
        {
            "NODE_ENV"         : "production",
            "RPC_HOST"         : "localhost",
            "RPC_PORT"         : "8545",
            "LISTENING_PORT"   : "30300",
            "INSTANCE_NAME"    : "${NODE_FULLNAME}",
            "CONTACT_DETAILS"  : "${NODE_ADMIN_EMAIL}",
            "WS_SERVER"        : "http://${NETSTATS_SERVER}:3000",
            "WS_SECRET"        : "${NETSTATS_SECRET}",
            "VERBOSITY"        : 2
        }
    }
]
EOL
    cd ..
    sudo bash -c "cat > /etc/systemd/system/oracles-netstats.service <<EOF
[Unit]
Description=oracles netstats service
After=oracles-pm2.service
[Service]
Type=oneshot
RemainAfterExit=true
User=${ADMIN_USERNAME}
Group=${ADMIN_USERNAME}
Environment=MYVAR=myval
WorkingDirectory=/home/${ADMIN_USERNAME}/eth-net-intelligence-api
ExecStart=/usr/bin/pm2 startOrRestart app.json
[Install]
WantedBy=multi-user.target
EOF"
    sudo systemctl enable oracles-netstats
    sudo systemctl start oracles-netstats
    echo "<===== install_netstats_via_systemd"
}

use_deb_via_systemd() {
    echo "=====> use_deb_via_systemd"
    curl -LO "${PARITY_DEB_LOC}"
    sudo dpkg -i "$(basename ${PARITY_DEB_LOC})"
    sudo bash -c "cat > /etc/systemd/system/oracles-parity.service <<EOF
[Unit]
Description=oracles parity service
After=network.target
[Service]
User=${ADMIN_USERNAME}
Group=${ADMIN_USERNAME}
WorkingDirectory=/home/${ADMIN_USERNAME}
ExecStart=/usr/bin/parity --config=${NODE_TOML}
Restart=always
[Install]
WantedBy=multi-user.target
EOF"
    sudo systemctl enable oracles-parity
    sudo systemctl start oracles-parity
    echo "<===== use_deb_via_systemd"
}

use_bin_via_systemd() {
    echo "=====> use_bin_via_systemd"
    curl -o parity -L "${PARITY_BIN_LOC}"
    chmod +x parity
    sudo add-apt-repository ppa:ubuntu-toolchain-r/test
    sudo apt-get update
    sudo apt-get install -y libstdc++6
    sudo bash -c "cat > /etc/systemd/system/oracles-parity.service <<EOF
[Unit]
Description=oracles parity service
After=network.target
[Service]
User=${ADMIN_USERNAME}
Group=${ADMIN_USERNAME}
WorkingDirectory=/home/${ADMIN_USERNAME}
ExecStart=/home/${ADMIN_USERNAME}/parity --config=${NODE_TOML}
Restart=always
[Install]
WantedBy=multi-user.target
EOF"
    sudo systemctl enable oracles-parity
    sudo systemctl start oracles-parity
    echo "<===== use_bin_via_systemd"
}

configure_logrotate() {
    echo "=====> configure_logrotate"

    sudo bash -c "cat > /home/${ADMIN_USERNAME}/oracles-logrotate.conf << EOF
/home/${ADMIN_USERNAME}/logs/*.log {
    rotate 10
    size 200M
    missingok
    compress
    copytruncate
    dateext
    dateformat %Y-%m-%d-%s
    olddir old
}

/home/${ADMIN_USERNAME}/.pm2/pm2.log {
    su ${ADMIN_USERNAME} ${ADMIN_USERNAME}
    rotate 10
    size 200M
    missingok
    compress
    copytruncate
    dateext
    dateformat %Y-%m-%d-%s
}
EOF"

    sudo bash -c "cat > /etc/cron.hourly/oracles-logrotate <<EOF
#!/bin/bash
/usr/sbin/logrotate /home/${ADMIN_USERNAME}/oracles-logrotate.conf
EOF"
    sudo chmod 755 /etc/cron.hourly/oracles-logrotate

    echo "<===== configure_logrotate"
}

echo "<===== sourcing common.funcs"