#!/bin/bash
#==============================================================#
# File      :   configure
# Desc      :   generate pigsty.yml config according to env
# Ctime     :   2021-05-17
# Mtime     :   2024-08-25
# Path      :   configure
# Author    :   Ruohang Feng ([email protected])
# License   :   AGPLv3
#==============================================================#
PIGSTY_VERSION=v3.0.1

#--------------------------------------------------------------#
# Usage
#--------------------------------------------------------------#
# ./configure
#     [-i|--ip <ip>]
#     [-r|--region <region>   [default|china|europe]
#     [-c|--conf <confname>   [meta|dual|trio|full|prod]
#     [-n|--non-interactive]
#     [-x|--proxy]
#==============================================================#
# args
#  -i  --ip  <ip addr>    : set local primary ip address
#  -c  --conf             : conf, (el7|el8|el9|ubuntu20|debian|...)
#  -n  --non-interactive  : flag, run as non-interactive mode
#  -x  --proxy            : flag, setup proxy_env from environment
#==============================================================#
INTERACTIVE=true                  # run configure with interactive mode
PRIMARY_IP=""                     # primary IP address (do not use public IP)
MODE=""                           # config template (meta|dual|trio|full|prod)
REGION=""                         # default region (default|china|europe)
USE_PROXY=false                   # use global env http_proxy, https_proxy, all_proxy, no_proxy
DEFAULT_NO_PROXY="localhost,127.0.0.1,10.0.0.0/8,192.168.0.0/16,*.pigsty,*.aliyun.com,mirrors.*,mirror.*,*.myqcloud.com,*.tsinghua.edu.cn,*.fedoraproject.org"


#--------------------------------------------------------------#
# Utils
#--------------------------------------------------------------#
__CN='\033[0m';__CB='\033[0;30m';__CR='\033[0;31m';__CG='\033[0;32m';
__CY='\033[0;33m';__CB='\033[0;34m';__CM='\033[0;35m';__CC='\033[0;36m';__CW='\033[0;37m';
function log_info() {  printf "[${__CG} OK ${__CN}] ${__CG}$*${__CN}\n";   }
function log_warn() {  printf "[${__CY}WARN${__CN}] ${__CY}$*${__CN}\n";   }
function log_error() { printf "[${__CR}FAIL${__CN}] ${__CR}$*${__CN}\n";   }
function log_debug() { printf "[${__CB}HINT${__CN}] ${__CB}$*${__CN}\n"; }
function log_input() { printf "[${__CM} IN ${__CN}] ${__CM}$*\n=> ${__CN}"; }
function log_hint()  { printf "${__CB}$*${__CN}"; }
ipv4_regexp='(([0-9]|[0-9]{2}|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[0-9]{2}|1[0-9]{2}|2[0-4][0-9]|25[0-5])'


#--------------------------------------------------------------#
# Param
#--------------------------------------------------------------#
PROG_NAME="$(basename $0)"
PROG_DIR="$(cd $(dirname $0) && pwd)"
PIGSTY_HOME="${PROG_DIR}"
REPO_NAME=pigsty
NGINX_HOME=/www
REPO_DIR=${NGINX_HOME}/${REPO_NAME}
BIN_DIR=${PIGSTY_HOME}/files/bin

# extract os vendor & version from /etc/os-release
OS_VENDOR=""
OS_VERSION=""
OS_PACKAGE=""
OS_MANAGER=""


#----------------------------------------------#
# region
#----------------------------------------------#
# return 0 if behind gfw (inside mainland china), otherwise 1
function behind_gfw() {
    local return_code=$(curl -I -s --connect-timeout 1 www.google.com -w %{http_code} | tail -n1)
    if [ "${return_code}" = "200" ]; then
        return 1
    fi
    return 0
}


function check_region(){
  if [ "${REGION}" == "" ]; then
    if behind_gfw; then
        REGION=china       # mainland china is behind GFW
    else
        REGION=default     # otherwise use default mirror
    fi
    log_info "region = ${REGION}"
  fi
}

#----------------------------------------------#
# proxy
#----------------------------------------------#
function check_proxy(){
  if [[ "${USE_PROXY}" == "true" ]]; then

    if [[ "${HTTP_PROXY}" == '' && ${http_proxy} != '' ]]; then
      #log_info "use http_proxy instead of HTTP_PROXY"
      HTTP_PROXY=${http_proxy}
    fi

    if [[ "${NO_PROXY}" == '' ]]; then
      #log_info "use the default no proxy"
      NO_PROXY=${DEFAULT_NO_PROXY}
    fi

    if [[ "${ALL_PROXY}" != '' && ${HTTP_PROXY} == '' ]]; then
      #log_info "use ALL_PROXY as HTTP_PROXY"
      HTTP_PROXY=${ALL_PROXY}
    fi

    if [[ "${ALL_PROXY}" != '' && ${HTTPS_PROXY} == '' ]]; then
      #log_info "use ALL_PROXY as HTTPS_PROXY"
      HTTPS_PROXY=${ALL_PROXY}
    fi
    log_info "proxy = from env"
  fi
}


#----------------------------------------------#
# kernel
#----------------------------------------------#
function check_kernel(){
    local kernel_name=$(uname -s)
    if [[ "${kernel_name}" == "Linux" ]]; then
        log_info "kernel = ${kernel_name}"
        return 0
    else
        log_warn "kernel = ${kernel_name}, not supported, Linux only"
        #exit 1
    fi
}

#----------------------------------------------#
# machine
#----------------------------------------------#
function check_machine(){
    local machine_name=$(uname -m)
    if [[ "${machine_name}" == "x86_64" ]]; then
        log_info "machine = ${machine_name}"
        return 0
    else
        log_warn "machine = ${machine_name}, not supported, x86_64 only"
        #exit 2
    fi
}

#----------------------------------------------#
# os package manager (yum|apt|...)
#----------------------------------------------#
function check_package_manager(){
    # get package / manager: rpm|deb and dnf|yum|apt|apt-get|zypper
    if command -v dpkg >/dev/null 2>&1; then
        OS_PACKAGE="deb"
        if command -v apt >/dev/null 2>&1; then
            OS_MANAGER="apt"
        elif command -v apt-get >/dev/null 2>&1; then
            OS_MANAGER="apt-get"
        else
            log_error "fail to determine os package manager for deb"
            exit 4
        fi
    elif command -v rpm >/dev/null 2>&1; then
        OS_PACKAGE="rpm"
        if command -v dnf >/dev/null 2>&1; then
            OS_MANAGER="dnf"
        elif command -v yum >/dev/null 2>&1; then
            OS_MANAGER="yum"
        elif command -v zypper >/dev/null 2>&1; then
            OS_MANAGER="zypper"
        else
            log_error "fail to determine os package manager for rpm"
            exit 4
        fi
    else
        log_error "fail to determine os package type"
        exit 3
    fi
    log_info "package = ${OS_PACKAGE},${OS_MANAGER}"
}


#----------------------------------------------#
# os release (Linux|Darwin etc..)
#----------------------------------------------#
function check_vendor_version(){
  if [[ -f /etc/os-release ]]; then
      . /etc/os-release
      OS_VENDOR="$ID"
      OS_VERSION="$VERSION_ID"
      if [[ $VERSION_ID == *.* ]]; then
          OS_VERSION=$(echo "$VERSION_ID" | cut -d. -f1)
      else
          OS_VERSION="${VERSION_ID}"
      fi
      log_info "vendor  = ${OS_VENDOR} (${NAME})"
      log_info "version = ${OS_VERSION} (${VERSION_ID})"
      return 0
  else
      log_warn "/etc/os-release file not found, unknown OS"
      #exit 5
  fi
}


#----------------------------------------------#
# sudo
#----------------------------------------------#
function can_nopass_sudo(){
    local current_user=$(whoami)
    if [[ "${current_user}" == "root" ]]; then
        return 0
    fi
    if sudo -n ls >/dev/null 2>/dev/null; then
        return 0
    fi
    return 1
}

function check_sudo(){
    local current_user=$(whoami)
    if can_nopass_sudo; then
        log_info "sudo = ${current_user} ok"
    else
        log_warn "sudo = ${current_user} missing nopasswd"
        log_warn "fix nopass sudo for '${current_user}' with sudo:"
        log_hint "echo '%%${current_user} ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.d/${current_user}\n"
        # exit 5   # we don't exit here , just a configure process
    fi
}


#----------------------------------------------#
# ssh
#----------------------------------------------#
# One MUST have nopass to localhost with same user
# configure can fix that for you (via ssh-keygen)

function can_nopass_ssh(){
    local current_user=$(whoami)
    local user=${1-${current_user}}
    local ipaddr=${2-'127.0.0.1'}
    if ssh -oBatchMode=yes -o "StrictHostKeyChecking no" ${user}@${ipaddr} 'ls' 1>/dev/null 2>/dev/null; then
        return 0
    else
        return 1
    fi
}

function check_ssh(){
    if can_nopass_ssh ; then
        log_info "ssh = $(whoami)@127.0.0.1 ok"
        return 0
    else
        log_warn "ssh = $(whoami)@127.0.0.1 failed"
        # exit 6   # we don't exit here , just a configure process
    fi
}


#----------------------------------------------#
# primary ip
#----------------------------------------------#
# One MUST configure a local primary IP address
# local primary ip are fetched in following order
# 1. if ip is given via -i|--ip , just use it
# 2. if only one ip is detected, just use it
# 3. if multiple ip detected, ask user for it  (interactive mode)
# 4. if -n|non-interactive is set, abort on error
#----------------------------------------------#
function is_valid_ip(){
    if [[ "$1" =~ (([0-9]|[0-9]{2}|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[0-9]{2}|1[0-9]{2}|2[0-4][0-9]|25[0-5]) ]]; then
        return 0
    else
        return 1
    fi
}

function get_ip_count(){
    echo $(hostname --all-ip-addresses 2>/dev/null | wc -w)
}

function list_ipaddr(){
    local ipList=$(hostname --all-ip-addresses)
    local i=0
    for ip in $ipList
    do
        i=$((i+1))
        local ipDetail=$(ip addr 2>/dev/null | grep "inet ${ip}")
        printf "    (${__CC}${i}${__CN}) ${__CR}${ip}${__CN}\t${__CY}${ipDetail}${__CN}\n"
    done
}

function check_ipaddr(){
    local primary_ip=${1-${PRIMARY_IP}}
    local interactive=${2-${INTERACTIVE}}
    # if ip is given, check it
    if [[ ! -z "${primary_ip}" ]]; then
        if is_valid_ip ${primary_ip}; then
            log_info "primary_ip = ${primary_ip} (from argument)"
            PRIMARY_IP=${primary_ip}
            return 0
        else
            log_error "primary_ip = ${primary_ip} invalid (from argument)"
            exit 7
        fi
    fi

    local ipCount=$(get_ip_count)
    if ((ipCount<1)); then
        log_warn "primary_ip = probe failed, use 10.10.10.10"
        PRIMARY_IP=10.10.10.10
        return 0
    fi
    if ((ipCount==1)); then
        log_info "primary_ip = $(hostname --all-ip-addresses) (from probe)"
        PRIMARY_IP=$(hostname --all-ip-addresses | egrep -o '(([0-9]|[0-9]{2}|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[0-9]{2}|1[0-9]{2}|2[0-4][0-9]|25[0-5])')
        return 0
    fi

    # multiple IP detected
    log_warn "Multiple IP address candidates found:"
    list_ipaddr

    # special case: demo fixed ip (10.10.10.10), we will choose it directly without asking!
    if  [[ $(hostname --all-ip-addresses) == *'10.10.10.10'* ]]; then
        log_info "primary_ip = 10.10.10.10 (from demo)"
        PRIMARY_IP="10.10.10.10"
        return 0
    fi

    # ask for input if in interactive mode, abort on non-interactive mode
    if [[ ${interactive} != "true" ]]; then
        log_error "primary_ip = dilemma abort"
        log_hint "HINT: specify ip with -i|--ip , or disable non-interactive mode\n"
        exit 9
    fi

    log_input "INPUT primary_ip address (of current meta node, e.g 10.10.10.10):"
    read -r
    local primary_ip=${REPLY}
    if is_valid_ip ${primary_ip}; then
        log_info "primary_ip = ${primary_ip} (from input)"
        PRIMARY_IP=${primary_ip}
        return 0
    else
        log_error "primary_ip = ${primary_ip} invalid (from input)"
        exit 9
    fi
}

#----------------------------------------------#
# check admin
#----------------------------------------------#
# check whether current user have nopass ssh
# access to primary ip with sudo privilege set

function check_admin(){
    local primary_ip=${1-${PRIMARY_IP}}
    local current_user=$(whoami)
    if ssh -t -o "StrictHostKeyChecking no" -o "ConnectTimeout=4" ${primary_ip} 'sudo -n ls' 1>/dev/null 2>/dev/null; then
        log_info "admin = ${current_user}@${primary_ip} ok"
    else
        log_error "admin = ${current_user}@${primary_ip} failed (nopass ssh sudo failed)"
        log_hint "check ${current_user} in sudoer, @${primary_ip} is ssh accessible\n"
        # exit 10  # we don't exit here , just a configure process
    fi
    # if using root, warning
    if [[ "${current_user}" == "root" ]]; then
        log_warn "user = root is not recommended, sure?"
    fi
}


#----------------------------------------------#
# check deployment mode
#----------------------------------------------#
function check_mode(){
    local mode=${1-${MODE}}
    local primary_ip=${2-${PRIMARY_IP}}
    # if mode is explicitly set, just use it
    if [[ ! -z "${mode}" ]]; then
        log_info "mode = ${mode} (manually set)"
        return 0
    fi

    # use el by default, and adhoc template for el7, will be obsolete soon (2024)
    if [[ ${OS_PACKAGE} == "rpm" ]]; then
        if [[ "${OS_VERSION}" == "7" ]]; then
            MODE=default/el7    # deprecated os support: el7
            log_warn "mode = el7, CentOS 7.9 EOL @ 2024-06-30, deprecated, consider using el8 or el9 instead"
            return 0
        elif [[ "${OS_VERSION}" == "8" ]]; then
            MODE=default/el8
            log_info "mode = el8"
            return 0
        elif [[ "${OS_VERSION}" == "9" ]]; then
            MODE=default/el9
            log_info "mode = el9"
            return 0
        fi

        # fallback to el8 by default
        log_warn "mode = ${OS_VENDOR} ${OS_VERSION} unknown, fallback to default/el8"
        MODE=default/el8
        return 0
    fi

    # use ubuntu by default
    if [[ ${OS_PACKAGE} == "deb" ]]; then
        if [[ "${OS_VENDOR}" == "debian" ]]; then
            if [[ "${OS_VERSION}" == "11" ]]; then
                MODE=default/d11     # deprecated os support: debian11
                log_warn "mode = d11 (debian11), EOL @ 2024-08-14, deprecated, consider using debian12 instead"
                return 0
            elif [[ "${OS_VERSION}" == "12" ]]; then
                MODE=default/d12
                log_info "mode = d12 (debian12)"
                return 0
            fi
            MODE=default/d12
            log_warn "os = ${OS_VENDOR} ${OS_VERSION} unknown, fallback to debian 12"
            return 0
        elif [[ "${OS_VENDOR}" == "ubuntu" ]]; then
            if [[ "${OS_VERSION}" == "20" ]]; then
                MODE=default/u20     # deprecated os support: ubuntu20
                log_warn "mode = u20 (ubuntu20.04), EOL @ 2025-04-23, deprecated, consider using ubuntu22.04 instead"
                return 0
            elif [[ "${OS_VERSION}" == "22" ]]; then
                MODE=default/u22
                log_info "mode = u22 (ubuntu22.04)"
                return 0
            fi
            MODE=default/u22
            log_warn "os = ${OS_VENDOR} ${OS_VERSION} unknown, fallback to ubuntu 22"
            return 0
        fi
    fi

    # if OS is not determined, fall backup to the generic conf/meta.yml
    log_warn "mode = meta (fallback to generic config)"
    MODE=meta
    return 0
}



#----------------------------------------------#
# generate config
#----------------------------------------------#
function check_config(){
    local primary_ip=${1-${PRIMARY_IP}}
    local mode=${2-${MODE}} # use files/pigsty/${mode}.yml as template
    local pigsty_home=${3-${PIGSTY_HOME}}
    local config_src="${pigsty_home}/conf/${mode}.yml"
    local config_dst="${pigsty_home}/pigsty.yml"

    # panic if given config file not exists
    if [[ ! -f ${config_src} ]]; then
        log_error "config = conf/${mode}.yml not exists"
        exit 11
    fi
    cat "${config_src}" > "${config_dst}"

    # copy target config, and replace IP placeholder for singleton templates
    case "${mode}" in
      meta|default*|dbms*) # replace primary IP address for these config templates
        sed -ie "s/10.10.10.10/${primary_ip}/g" "${config_dst}"
        rm -rf "${config_dst}e"
        ;;
    esac

    # replace node_tune & pg_conf with tiny or oltp according to cpu count
    if (($(getconf _NPROCESSORS_ONLN)>=4)); then
        sed -ie "s/pg_conf: tiny.yml/pg_conf: oltp.yml/g" "${config_dst}"
        sed -ie "s/node_tune: tiny/node_tune: oltp/g"     "${config_dst}"
        rm -rf "${config_dst}e"
    fi

    # replace region if not default
    if [[ ${REGION} != "default" ]]; then
        sed -ie 's/    region: default/    region: '"${REGION}"'  /g' "${config_dst}"
        rm -rf "${config_dst}e"
    fi

    # add proxy_env from current env
    if [[ "${USE_PROXY}" == "true" ]]; then
        local proxy_txt_ori="    proxy_env:"
        local proxy_txt="${proxy_txt_ori}"
        # build proxy_env config from non-empty environment variable
        [[ "${HTTP_PROXY}"  != "" ]] && proxy_txt="${proxy_txt}\n      http_proxy: \"${HTTP_PROXY}\""
        [[ "${HTTPS_PROXY}" != "" ]] && proxy_txt="${proxy_txt}\n      https_proxy: \"${HTTPS_PROXY}\""
        [[ "${ALL_PROXY}"   != "" ]] && proxy_txt="${proxy_txt}\n      all_proxy: \"${ALL_PROXY}\""
        [[ "${NO_PROXY}"    != "" ]] && proxy_txt="${proxy_txt}\n      no_proxy: \"${NO_PROXY}\""
        # remove existing proxy_env config and replace with the new one:
        if [[ $proxy_txt != "${proxy_txt_ori}" ]]; then
            sed -ie "/^\s*proxy_env:.*$/d" "${config_dst}"
            sed -ie "/^\s*https\?_proxy:.*$/d" "${config_dst}"
            sed -ie "/^\s*all_proxy:.*$/d" "${config_dst}"
            sed -ie "/^\s*no_proxy:.*$/d" "${config_dst}"
            sed -ie "s%^\(\s\{4\}region:.\+\)$%\1\n${proxy_txt}%g" "${config_dst}"
            rm -rf "${config_dst}e"
        fi
    fi
    rm -rf "${config_dst}e"
    return 0
}


#----------------------------------------------#
# check utils
#----------------------------------------------#
# install ansible sshpass unzip wget yum , etc...
function check_utils(){
    # check ansible is installed
    if command -v ansible-playbook >/dev/null ; then
        log_info "ansible = $(ansible --version | head -n1)"
    else
        log_warn "ansible = not found"
        # exit 20     # we don't exit here, just a configure process
    fi
}


#--------------------------------------------------------------#
# Main
#--------------------------------------------------------------#
function main(){
    # arg parsing
    while [ $# -gt 0 ]; do
        case $1 in
            -h|--help)
                echo './configure [-n|--non-interactive] [-i|--ip <ipaddr>] [-c|--conf <confname>] [-x|--proxy]'
                exit 0;;
            -i|--ip) PRIMARY_IP="$2" ; shift;;
            -r|--region) REGION="$2" ; shift;;
            -m|--mode)     MODE="$2" ; shift;;
            -c|--conf|--config) MODE="$2" ; shift;;
            -n|--non-interactive) INTERACTIVE=false ;;
            -x|--proxy) USE_PROXY=true ;;
            (--) shift; break;;
            (-*) echo "$0: error - unrecognized option $1" 1>&2; exit 1;;
            (*) break;;
        esac
        shift
    done

    log_hint "configure pigsty ${PIGSTY_VERSION} begin\n"
    # check
    check_region          # region        = default
    check_kernel          # kernel        = Linux
    check_machine         # machine       = x86_64
    check_package_manager # package = rpm|deb, manager = dnf|yum|zypper|apt|apt-get
    check_vendor_version  # release       = centos, version = 7,8,9...
    check_sudo            # current_user  = NOPASSWD sudo
    check_ssh             # current_user  = NOPASSWD ssh
    check_proxy           # use_proxy     = true|false
    check_ipaddr          # primary_ip (arg|probe|input)                    (INTERACTIVE: ask for ip)
    check_admin           # check current_user@primary_ip nopass ssh sudo
    check_mode            # check config template
    check_config          # generate config according to primary_ip and mode
    #check_utils          # check ansible sshpass and other utils installed
    log_info "configure pigsty done"
    log_hint "proceed with ./install.yml \n"
}

main $@