hpcore/src/main.cpp

/**
    Entry point for HP Core
**/

#include <cstdio>
#include <iostream>
#include <thread>
#include "util.hpp"
#include "conf.hpp"
#include "crypto.hpp"
#include "usr/usr.hpp"

using namespace std;

/**
 * Parses CLI args and extracts hot pocket command and parameters given.
 * HP command line accepts command and the contract directory(optional)
 */
int parse_cmd(int argc, char **argv)
{
    if (argc > 1) //We get working dir as an arg anyway. So we need to check for >1 args.
    {
        // We populate the global contract ctx with the detected command.
        conf::ctx.command = argv[1];

        // For run/new/rekey, contract directory argument must be specified.

        if (conf::ctx.command == "run" || conf::ctx.command == "new" || conf::ctx.command == "rekey")
        {
            if (argc != 3)
            {
                cerr << "Contract directory not specified.\n";
            }
            else
            {
                // We inform the conf subsystem to populate the contract directory context values
                // based on the directory argument from the command line.
                conf::set_contract_dir_paths(argv[2]);

                return 0;
            }
        }
        else if (conf::ctx.command == "version")
        {
            if (argc == 2)
                return 0;
        }
    }

    // If all extractions fail display help message.

    cerr << "Arguments mismatch.\n";
    cout << "Usage:\n";
    cout << "hpcore version\n";
    cout << "hpcore <command> <contract dir> (command = run | new | rekey)\n";
    cout << "Example: hpcore run ~/mycontract\n";

    return -1;
}

int main(int argc, char **argv)
{
    // Extract the CLI args
    // After this call conf::ctx must be populated.
    if (parse_cmd(argc, argv) != 0)
        return -1;

    if (conf::ctx.command == "version")
    {
        // Print the version
        cout << util::HP_VERSION << endl;
    }
    else
    {
        // This block is about contract operations (new/rekey/run)
        // All the contract operations will be executed on the contract directory specified
        // in the command line args. 'parse_cmd()' above takes care of populating the contexual directory paths.

        // For any contract opreation to execute, we should init the crypto subsystem.
        if (crypto::init() != 0)
            return -1;

        if (conf::ctx.command == "new")
        {
            // This will create a new contract with all the required files.
            if (conf::create_contract() != 0)
                return -1;
        }
        else
        {
            if (conf::ctx.command == "rekey")
            {
                // This will generate new signing keys for the contract.
                if (conf::rekey() != 0)
                    return -1;
            }
            else if (conf::ctx.command == "run")
            {
                // In order to host the contract we should init some required sub systems.
                if (conf::init() != 0 || usr::init() != 0)
                    return -1;

                // This will start hosting the contract and start consensus rounds.
                // TODO

                // Temp code to avoid exiting.
                string s;
                cin >> s;
            }
        }
    }
    cout << "exited normally\n";
    return 0;
}