vRAM Getting Started - without zeus

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Hardware Requirements

Install

Clone into your project directory:

git clone  --single-branch --branch v1.2 --recursive https://github.com/liquidapps-io/dist

Modify your contract

vRAM provides a drop in replacement for the multi_index table that is also interacted with in the same way as the traditional multi_index table making it very easy and familiar to use. Please note that secondary indexes are not currently implemented for dapp::multi_index tables.

To access the vRAM table, add the following lines to your smart contract:

At header:

#include "../dist/contracts/eos/dappservices/multi_index.hpp"

#define DAPPSERVICES_ACTIONS() \
    XSIGNAL_DAPPSERVICE_ACTION \
    IPFS_DAPPSERVICE_ACTIONS

#define DAPPSERVICE_ACTIONS_COMMANDS() \
    IPFS_SVC_COMMANDS()
  
#define CONTRACT_NAME() mycontract

After contract class header

CONTRACT mycontract : public eosio::contract { 
  using contract::contract; 
public: 

/*** ADD HERE ***/
DAPPSERVICES_ACTIONS()

Replace eosio::multi_index

/*** REPLACE ***/
    typedef eosio::multi_index<"accounts"_n, account> accounts_t;

/*** WITH ***/
      typedef dapp::multi_index<"accounts"_n, account> accounts_t;
      
/*** ADD (for client side query support): ***/
      typedef eosio::multi_index<".accounts"_n, account> accounts_t_v_abi;
      TABLE shardbucket {
          std::vector<char> shard_uri;
          uint64_t shard;
          uint64_t primary_key() const { return shard; }
      };
      typedef eosio::multi_index<"accounts"_n, shardbucket> accounts_t_abi;

Add DSP actions dispatcher

/*** REPLACE ***/
EOSIO_DISPATCH(mycontract,(youraction1)(youraction2)(youraction2))

/*** WITH ***/
EOSIO_DISPATCH_SVC(mycontract,(youraction1)(youraction2)(youraction2))

Compile

eosio-cpp -abigen -o contract.wasm contract.cpp

Deploy Contract

# Buy RAM:
cleos -u $EOS_ENDPOINT system buyram $KYLIN_TEST_ACCOUNT $KYLIN_TEST_ACCOUNT "50.0000 EOS" -p $KYLIN_TEST_ACCOUNT@active
# Set contract code and abi
cleos -u $EOS_ENDPOINT set contract $KYLIN_TEST_ACCOUNT ../contract -p $KYLIN_TEST_ACCOUNT@active

# Set contract permissions
cleos -u $EOS_ENDPOINT set account permission $KYLIN_TEST_ACCOUNT active "{\"threshold\":1,\"keys\":[\"$KYLIN_TEST_PUBLIC_KEY\"],\"accounts\":[{\"permission\":{\"actor\":\"eosio.code\",\"permission\":\"active\"},\"weight\":1}]}" active -p $KYLIN_TEST_ACCOUNT@active

Select and stake DAPP for DSP package

DSP Package and staking

Test

Finally you can now test your vRAM implementation by sending an action through your DSP’s API endpoint.

The endpoint can be found in the package table of the dappservices account on all chains.

export EOS_ENDPOINT=https://dspendpoint
cleos -u $EOS_ENDPOINT push action $KYLIN_TEST_ACCOUNT youraction1 "[\"param1\",\"param2\"]" -p $KYLIN_TEST_ACCOUNT@active

The result should look like:

executed transaction: 865a3779b3623eab94aa2e2672b36dfec9627c2983c379717f5225e43ac2b74a  104 bytes  67049 us
#  yourcontract <= yourcontract::youraction1         {"param1":"param1","param2":"param2"}
>> {"version":"1.0","etype":"service_request","payer":"yourcontract","service":"ipfsservice1","action":"commit","provider":"","data":"DH......"}