Techneek meetup technical demo script

techneek_meetup_eosio.txt

Nodeos command:

nodeos -e -p eosio --plugin eosio::producer_plugin --plugin eosio::chain_api_plugin --plugin eosio::http_plugin --plugin eosio::history_plugin --plugin eosio::history_api_plugin --access-control-allow-origin='*' --contracts-console --http-validate-host=false --verbose-http-errors

CDT:

eosio-cpp registry.cpp  -o registry.wasm 

Cleos commands:

cleos wallet create
cleos wallet create --to-console
cleos wallet open
cleos wallet unlock
cleos wallet list
cleos wallet create_key
cleos create account eosio registry [Public Key]
cleos get account registry
cleos create account eosio han [Public Key]
cleos get account han

cleos set contract registry ./
cleos get abi registry
cleos push action registry upsert '["han","han", 888, 1, 100, "Hollywood Rd","Hong Kong","China"]' -p han@active
cleos get table registry registry registration
cleos push action registry erase '["han"]' -p registry@active
cleos push action registry erase '["han"]' -p han@active
cleos get table registry registry registration

registry.cpp:

#include <eosio/eosio.hpp>

using namespace eosio;

class [[eosio::contract]] registry : public eosio::contract {

  private:
    struct [[eosio::table]] registration {
      name owner;
      std::string full_name;

      uint32_t house_num;
      uint64_t deed_num;
      float house_size;
      
      std::string street;
      std::string city;
      std::string state;

      uint64_t primary_key() const { return owner.value; }
    };

  typedef eosio::multi_index<"registration"_n, registration> registrations_index;

  public:
    registry(name receiver, name code, datastream<const char*> ds)
      :contract(receiver, code, ds) {}

    [[eosio::action]]
    void upsert(name owner, std::string full_name, 
      uint32_t house_num, uint64_t deed_num, float house_size,
      std::string street, std::string city, std::string state) {

      //Verify permission. 
      //Is the user who sent the transaction is really a property owner?
      require_auth(owner);
      
      //instantise a Multi Index table
      registrations_index registrations(get_self(), get_first_receiver().value);
      
      auto iterator = registrations.find(owner.value);
      
      if( iterator == registrations.end() ) {
        //owner will be the payer for data storage cost
        registrations.emplace(owner, [&]( auto& row ) {
          row.owner = owner;
          row.full_name =  full_name;
          row.deed_num = deed_num;
          row.house_num = house_num;
          row.house_size = house_size;
          row.street = street;
          row.city = city;
          row.state = state;
        });
      }
      else {
        //iterator points to the location
        registrations.modify(iterator, owner, [&]( auto& row ) {
          row.owner = owner;
          row.full_name =  full_name;
          row.deed_num = deed_num;
          row.house_num = house_num;
          row.house_size = house_size;
          row.street = street;
          row.city = city;
          row.state = state;
        });
      }
    }

    [[eosio::action]]
    void erase(name owner) {
      require_auth(owner);
      registrations_index registrations( get_self(), get_first_receiver().value);

      auto iterator = registrations.find(owner.value);

      //check if the record exists
      check(iterator != registrations.end(), "Record does not exist");
      registrations.erase(iterator);
    }
};