dropshell/src/service_runner.cpp

#include "config.hpp"
#include "service_runner.hpp"
#include "server_env.hpp"
#include "templates.hpp"
#include "services.hpp"
#include "utils/directories.hpp"
#include "utils/utils.hpp"
#include <boost/filesystem.hpp>
#include <iostream>
#include <fstream>
#include <sstream>
#include <cstdlib>
#include <chrono>
#include <iomanip>

namespace fs = boost::filesystem;

namespace dropshell {


service_runner::service_runner() : m_server_name(""), m_server_env(nullptr) {}

bool service_runner::init(const std::string& server_name, const std::string& service_name) {
    if (server_name.empty() || service_name.empty())
        return false;

    // Initialize server environment
    try {
        m_server_env = std::make_unique<server_env>(server_name);
        if (!m_server_env->is_valid()) {
            std::cerr << "Error: Invalid server environment" << std::endl;
            m_server_env.reset();
            return false;
        }
    } catch (const std::exception& e) {
        std::cerr << "Error: Failed to initialize server environment: " << e.what() << std::endl;
        return false;
    }

    m_server_name = server_name;
    m_service_info = get_service_info(server_name, service_name);
    
    mRemote_service_path = get_remote_service_path(m_server_name, m_service_info.service_name);
    mRemote_service_config_path = get_remote_service_config_path(m_server_name, m_service_info.service_name);
    mRemote_service_template_path = get_remote_service_template_path(m_server_name, m_service_info.service_name);
    mRemote_service_env_file = get_remote_service_env_file(m_server_name, m_service_info.service_name);

    return !m_service_info.path.empty();
}

// Helper method implementations
std::string service_runner::construct_ssh_cmd(const server_env &env) {
    std::stringstream ssh_cmd;
    ssh_cmd << "ssh -p " << env.get_SSH_PORT() << " "
            << env.get_SSH_USER() << "@" << env.get_SSH_HOST() << " ";
    return ssh_cmd.str();
}

std::string service_runner::construct_ssh_cmd() const
{
    if (!m_server_env)
        return std::string();
    return construct_ssh_cmd(*m_server_env);
}

std::string service_runner::construct_standard_command_run_cmd(const std::string &command) const
{
    std::string script_path = mRemote_service_template_path + "/" + command + ".sh";
    std::string run_cmd = "'cd " + quote(mRemote_service_template_path) + 
                        " && /bin/bash "+quote(script_path)+" "+quote(mRemote_service_config_path)+"'";
    return run_cmd;
}

bool service_runner::check_remote_dir_exists(const std::string &dir_path) const
{
    std::string check_dir_cmd = construct_ssh_cmd() + "'test -d " + quote(dir_path) + "'";
    if (system(check_dir_cmd.c_str()) != 0) {
        std::cerr << "Error: Directory not found on remote server:" << fs::path(dir_path).filename().string() << std::endl;
        return false;
    }
    return true;
}

bool service_runner::check_remote_file_exists(const std::string& file_path) const {
    std::string check_cmd = construct_ssh_cmd() + "'test -f " + quote(file_path) + "'";
    if (system(check_cmd.c_str()) != 0) {
        std::cerr << "Error: File not found on remote server: " << fs::path(file_path).filename().string() << std::endl;
        return false;
    }
    return true;
}

bool service_runner::check_remote_items_exist(const std::vector<std::string> &file_paths) const
{
    // convert file_paths to a single string, separated by spaces
    std::string file_paths_str;
    std::string file_names_str;
    for (const auto& file_path : file_paths) {
        file_paths_str += quote(file_path) + " ";
        file_names_str += fs::path(file_path).filename().string() + " ";
    }
    // check if all items in the vector exist on the remote server, in a single command.
    std::string check_cmd = construct_ssh_cmd() + "'for item in " + file_paths_str + "; do test -f $item; done'";
    if (system(check_cmd.c_str()) != 0) {
        std::cerr << "Error: Required items not found on remote server: " << file_names_str << std::endl;
        return false;
    }
    return true;
}

bool service_runner::execute_ssh_command(const std::string& command, const std::string& error_msg) const {
    std::string full_cmd = construct_ssh_cmd() + command;
    return execute_local_command(full_cmd, error_msg);
}
bool service_runner::execute_local_command(const std::string& command, const std::string& error_msg) const {
    bool okay = (system(command.c_str()) == 0);

    if (!okay && !error_msg.empty())
        std::cerr << "Error: " << error_msg << std::endl;
    return okay;
}

bool service_runner::execute_local_command_and_capture_output(const std::string &command, std::string &output)
{
    std::string full_cmd = command + " 2>&1";
    FILE *pipe = popen(full_cmd.c_str(), "r");
    if (!pipe) {
        std::cerr << "Error: Failed to execute command: " << command << std::endl;
        return false;
    }
    char buffer[128];
    while (fgets(buffer, sizeof(buffer), pipe) != nullptr) {
        output += buffer;
    }
    pclose(pipe);
    return true;
}

bool service_runner::install() {
    maketitle("Installing " + m_service_info.service_name + " (" + m_service_info.template_name + ") on " + m_server_name);

    if (!m_server_env) return false; // should never hit this.
    
    // Check if template exists
    template_info tinfo;
    if (!get_template_info(m_service_info.template_name, tinfo))
        return false;
        
    // Create service directory
    std::string mkdir_cmd = "'mkdir -p " + quote(mRemote_service_path) + "'";
    if (!execute_ssh_command(mkdir_cmd, "Failed to create service directory"))
        return false;
    
    // Check if rsync is installed on remote host
    std::string check_rsync_cmd = "'which rsync > /dev/null 2>&1'";
    if (!execute_ssh_command(check_rsync_cmd, "rsync is not installed on the remote host"))
        return false;

    // Copy template files
    {
        std::cout << "Copying template files from [LOCAL] " << tinfo.path << std::endl << std::string(24,' ')<<"to [REMOTE] " << mRemote_service_template_path << "/" << std::endl;
        std::string rsync_cmd = "rsync --delete -zrpc -e 'ssh -p " + m_server_env->get_SSH_PORT() + "' " + 
                            quote(tinfo.path + "/") + " "+ 
                            m_server_env->get_SSH_USER() + "@" + m_server_env->get_SSH_HOST() + ":" + 
                            quote(mRemote_service_template_path+"/");
        //std::cout << std::endl << rsync_cmd << std::endl << std::endl;
        execute_local_command(rsync_cmd,"Failed to copy template files");
    }
    
    // Copy service files (including service.env)
    {
        std::string local_service_path = get_local_service_path(m_server_name, m_service_info.service_name);
        if (local_service_path.empty() || !fs::exists(local_service_path)) {
            std::cerr << "Error: Service directory not found: " << local_service_path << std::endl;
            return false;
        }
        std::cout << "Copying service  files from [LOCAL] " << local_service_path << std::endl <<std::string(24,' ')<<"to [REMOTE] " << mRemote_service_config_path << std::endl; 
        std::string rsync_cmd = "rsync --delete -zrpc -e 'ssh -p " + m_server_env->get_SSH_PORT() + "' " + 
                            quote(local_service_path + "/") + " "+
                            m_server_env->get_SSH_USER() + "@" + m_server_env->get_SSH_HOST() + ":" + 
                            quote(mRemote_service_config_path + "/");
        execute_local_command(rsync_cmd,"Failed to copy service files");
    }

    // Run install script
    {
        std::string install_cmd = construct_standard_command_run_cmd("install");
        bool ok= execute_ssh_command(install_cmd, "Failed to run install script");
        if (!ok)
            return false;
    }

    // print health tick
    std::cout << "Health: " << healthtick() << std::endl;
    return true;
}

bool service_runner::uninstall() {
    maketitle("Uninstalling " + m_service_info.service_name + " (" + m_service_info.template_name + ") on " + m_server_name);
    
    if (!m_server_env) return false; // should never hit this.
    
    // 2. Check if service directory exists on server
    if (!check_remote_dir_exists(mRemote_service_path)) {
        std::cerr << "Service is not installed: " << m_service_info.service_name << std::endl;
        return true; // Nothing to uninstall
    }
    
    // 3. Run uninstall script if it exists
    std::string uninstall_script = mRemote_service_template_path + "/_uninstall.sh";
    bool script_exists = check_remote_file_exists(uninstall_script);
    
    if (script_exists) {
        std::string uninstall_cmd = construct_standard_command_run_cmd("uninstall");
        if (!execute_ssh_command(uninstall_cmd, "Failed to run uninstall script")) {
            std::cerr << "Warning: Uninstall script failed, but continuing with directory removal" << std::endl;
        }
    } else {
        std::cerr << "Warning: No uninstall script found. Unable to uninstall service." << std::endl;
        return false;
    }
    
    // 4. Remove the service directory from the server
    std::string rm_cmd = "'rm -rf " + quote(mRemote_service_path) + "'";
    if (!execute_ssh_command(rm_cmd, "Failed to remove service directory")) {
        return false;
    }
    
    std::cout << "Service " << m_service_info.service_name << " successfully uninstalled from " << m_server_name << std::endl;
    return true;
}

bool service_runner::run_command(const std::string& command) {
    if (!m_server_env) {
        std::cerr << "Error: Server service not initialized" << std::endl;
        return false;
    }
    template_info tinfo;
    if (!get_template_info(m_service_info.template_name, tinfo)) {
        std::cerr << "Error: Template '" << m_service_info.template_name << "' not found" << std::endl;
        return false;
    }
    if (!template_command_exists(m_service_info.template_name, command)) {
        std::cout << "No command script for " << m_service_info.template_name << " : " << command << std::endl;
        return true; // nothing to run.
    }

    // install doesn't require anything on the server yet.
    if (command == "install") 
        return install();

    std::string script_path = mRemote_service_template_path + "/" + command + ".sh";
    
    // Check if service directory exists
    if (!check_remote_dir_exists(mRemote_service_path)) {
        return false;
    }
    
    // Check if command script exists
    if (!check_remote_file_exists(script_path)) {
        return false;
    }

    // Check if env file exists
    if (!check_remote_file_exists(mRemote_service_env_file)) {
        return false;
    }

    if (command == "uninstall") 
        return uninstall();
    if (command == "backup") 
        return backup();
    if (command == "ssh") {
        interactive_ssh_service();
        return true;
    }

    // Run the generic command
    std::string run_cmd = construct_standard_command_run_cmd(command);
    return execute_ssh_command(run_cmd, "Command returned error code: " + script_path);
}

bool service_runner::backup() {
    maketitle("Backing up " + m_service_info.service_name + " (" + m_service_info.template_name + ") on " + m_server_name);

    if (!m_server_env) return false; // should never hit this.
    
    std::string command = "backup";

    std::string script_path = mRemote_service_template_path + "/" + command + ".sh";
    if (!template_command_exists(m_service_info.template_name, command)) {
        std::cout << "No backup script for " << m_service_info.template_name << std::endl;
        return true; // nothing to back up.
    }
    
    // Check if basic installed stuff is in place.
    if (!check_remote_items_exist({mRemote_service_path,script_path,mRemote_service_env_file}))
    {
        std::cerr << "Error: Required service directories not found on remote server" << std::endl;
        std::cerr << "Is the service installed?" << std::endl;
        return false;
    }

    // Create backups directory on server if it doesn't exist
    std::string server_backups_dir = m_server_env->get_DROPSHELL_DIR() + "/backups";
    std::string mkdir_cmd = "'mkdir -p " + quote(server_backups_dir) + "'";
    if (!execute_ssh_command(mkdir_cmd, "Failed to create backups directory on server")) {
        return false;
    }

    // Create backups directory locally if it doesn't exist
    std::string local_backups_dir = get_local_config_backups_path(0);
    if (local_backups_dir.empty()) {
        std::cerr << "Error: Local backups directory not found - is DropShell initialised?" << std::endl;
        return false;
    }
    if (!fs::exists(local_backups_dir)) {
        fs::create_directories(local_backups_dir);
    }

    // Get current datetime for backup filename
    auto now = std::chrono::system_clock::now();
    auto time = std::chrono::system_clock::to_time_t(now);
    std::stringstream datetime;
    datetime << std::put_time(std::localtime(&time), "%Y-%m-%d_%H-%M-%S");
    
    // Construct backup filename
    std::string backup_filename = m_server_name + "-" + m_service_info.service_name + "-" + datetime.str() + ".tgz";
    std::string server_backup_path = server_backups_dir + "/" + backup_filename;
    std::string local_backup_path = (fs::path(local_backups_dir) / backup_filename).string();

    // Run backup script
    std::string backup_cmd = "'cd " + quote(mRemote_service_template_path) + 
                         " && /bin/bash "+quote(script_path)+" "+quote(mRemote_service_config_path)+" "+
                         quote(server_backup_path)+"'";

    if (!execute_ssh_command(backup_cmd, "Backup script failed")) {
        std::cerr << "Backup script failed: " << backup_cmd << std::endl;
        return false;
    }

    // Copy backup file from server to local
    std::string scp_cmd = "scp -P " + m_server_env->get_SSH_PORT() + " " + 
                         m_server_env->get_SSH_USER() + "@" + m_server_env->get_SSH_HOST() + ":" + 
                         quote(server_backup_path) + " " + quote(local_backup_path);
    if (!execute_local_command(scp_cmd, "Failed to copy backup file from server")) {
        return false;
    }

    std::cout << "Backup created successfully: " << local_backup_path << std::endl;
    return true;
}

std::map<std::string, ServiceStatus> service_runner::get_all_services_status(std::string server_name)
{
    std::map<std::string, ServiceStatus> status;

    std::string command = "_allservicesstatus";
    std::string service_name = "dropshell-agent";

    if (!template_command_exists(service_name, command))
        {
            std::cerr << "Error: " << service_name << " does not contain the " << command << " script" << std::endl;
            return status;
        }

    std::string remote_service_path = get_remote_service_path(server_name, service_name);
    std::string remote_service_config_path = get_remote_service_config_path(server_name, service_name);
    std::string remote_service_template_path = get_remote_service_template_path(server_name, service_name);
    std::string remote_service_env_file = get_remote_service_env_file(server_name, service_name);

    server_env env(server_name);
    if (!env.is_valid()) {
        std::cerr << "Error: Invalid server environment" << std::endl;
        return status;
    }

    std::string script_path = remote_service_template_path + "/" + command + ".sh";
    std::string ssh_cmd = construct_ssh_cmd(env) + "'cd " + quote(remote_service_template_path) + 
                         " && /bin/bash "+quote(script_path)+" "+quote(remote_service_config_path)+"'";

    std::string output;
    if (!execute_local_command_and_capture_output(ssh_cmd, output))
        return status;

    std::stringstream ss(output);
    std::string line;
    while (std::getline(ss, line)) {
        std::string key, value;
        std::size_t pos = line.find("=");
        if (pos != std::string::npos) {
            key = dequote(trim(line.substr(0, pos)));
            value = dequote(trim(line.substr(pos + 1)));

            // decode key, it's of format SERVICENAME_[HEALTH|PORTS]
            std::string service_name = key.substr(0, key.find_last_of("_"));
            std::string status_type = key.substr(key.find_last_of("_") + 1);

            if (status_type == "HEALTH") { // healthy|unhealthy|unknown
                if (value == "healthy")
                    status[service_name].health = HealthStatus::HEALTHY;
                else if (value == "unhealthy")
                    status[service_name].health = HealthStatus::UNHEALTHY;
                else if (value == "unknown")
                    status[service_name].health = HealthStatus::UNKNOWN;
                else
                    status[service_name].health = HealthStatus::ERROR;
            } else if (status_type == "PORTS") { // port1,port2,port3
                std::vector<std::string> ports = string2multi(value);
                for (const auto& port : ports) {
                    if (port!="unknown")
                        status[service_name].ports.push_back(str2int(port));
                }
            }
        }
    }
    return status;
}

HealthStatus service_runner::is_healthy()
{
    if (!m_server_env) {
        std::cerr << "Error: Server service not initialized" << std::endl;
        return HealthStatus::ERROR;
    }

    // Check if status script exists
    std::string command = "status";

    if (!template_command_exists(m_service_info.template_name, command)) {
        return HealthStatus::UNKNOWN;
    }

    std::string script_path = mRemote_service_template_path + "/" + command + ".sh";
    if (!check_remote_file_exists(script_path)) {
        std::cerr << "Service is not installed: " << m_service_info.service_name << std::endl;
        return HealthStatus::NOTINSTALLED;
    }
    
    // Run status script, does not display output.
    std::string run_cmd = construct_standard_command_run_cmd("status");
    bool ok = execute_ssh_command(run_cmd, "");
    if (!ok)
        return HealthStatus::UNHEALTHY;

    return HealthStatus::HEALTHY;
}

std::string service_runner::healthtick()
{
    std::string green_tick = "\033[32m✓\033[0m";
    std::string red_cross = "\033[31m✗\033[0m";    
    std::string yellow_exclamation = "\033[33m!\033[0m";
    std::string unknown = "\033[33m?\033[0m";

    HealthStatus status = is_healthy();
    if (status == HealthStatus::HEALTHY)
        return green_tick;
    else if (status == HealthStatus::UNHEALTHY)
        return red_cross;
    else if (status == HealthStatus::UNKNOWN)
        return unknown;
    else
        return yellow_exclamation;
}

std::string service_runner::HealthStatus2String(HealthStatus status)
{
    if (status == HealthStatus::HEALTHY)
        return ":tick:";
    else if (status == HealthStatus::UNHEALTHY)
        return ":cross:";
    else if (status == HealthStatus::UNKNOWN)
        return ":question:";
    else if (status == HealthStatus::NOTINSTALLED)
        return ":warning:";
    else
        return ":error:";
}

std::string service_runner::healthmark()
{
    HealthStatus status = is_healthy();
    return HealthStatus2String(status);
}

void interactive_ssh(const std::string & server_name, const std::string & command) {
    std::string serverpath = get_local_server_path(server_name);
    if (serverpath.empty()) {
        std::cerr << "Error: Server not found: " << server_name << std::endl;
        return;
    }

    server_env env(server_name);
    if (!env.is_valid()) {
        std::cerr << "Error: Invalid server environment file: " << server_name << std::endl;
        return;
    }

    std::string ssh_address = env.get_SSH_HOST();
    std::string ssh_user = env.get_SSH_USER();
    std::string ssh_port = env.get_SSH_PORT();

    std::string login = ssh_user + "@" + ssh_address;

    // Execute ssh with server_name and command
    if (command.empty())
        execlp("ssh", "ssh", login.c_str(), "-p", ssh_port.c_str(), nullptr);
    else
        execlp("ssh", "ssh", login.c_str(), "-p", ssh_port.c_str(), command.c_str(), nullptr);
    
    // If exec returns, it means there was an error
    perror("ssh execution failed");
    exit(EXIT_FAILURE);
}

void service_runner::interactive_ssh_service()
{
    std::set<std::string> used_commands = get_used_commands(m_server_name, m_service_info.service_name);
    if (used_commands.find("ssh") == used_commands.end()) {
        std::cerr << "Error: "<< m_service_info.service_name <<" does not support ssh" << std::endl;
        return;
    }

    std::string command = construct_standard_command_run_cmd("ssh");
    interactive_ssh(m_server_name, command);
}



} // namespace dropshell