LiquidApps Documentation
  • Introduction
  • 🧙‍♂️The DAPP Network
    • The DAPP Token
      • DAPP Token Overview
      • DAPP Tokens Tracks
      • Claiming DAPP Tokens
      • DAPP Tokens Distribution
      • Air-HODL
    • Cross Chain Bridges
    • Examples
      • Token bridge
      • Price Feed
      • Elemental Battles
      • LiquidChess
      • LiquidPortfolio
    • DAPP Network Resources
      • @liquidapps/dapp-client
        • vRAM
        • LiquidAccounts
        • DAPP Services
        • Air-Hodl
      • eosio-push-guarantee
      • Link Library
        • EOSIO Link
          • Tables
          • Crons
          • Macros
          • Variables
        • EVM Link - Solidity (Coming Soon)
  • ⚡Working with Zeus
    • Introduction
      • Requirements
      • Install Zeus and Unboxing
        • More on zeus-box.json
      • Get Started fast! (Zeus-IDE)
      • Docker CI/CD
      • Example Github Using Zeus
      • Getting started with AntelopeIO Contracts (formerly EOSIO)
    • Zeus Basics
      • Compiling Contracts
        • Clean CMake Files
      • Unit Testing
        • Printing Console
        • Fetching Table
        • Helper Functions
        • Example
      • Create ...
        • Contract/Unit Test
          • All DAPP Network Services
        • DSP Service
        • Contract Deployment
      • Import/Export Keys
      • Migrate Contract
      • Start local environment
        • Kill Services
      • Upgrade
      • Zeus RC File
      • Zeus Config File
    • Zeus Box Basics
      • Zeus Boxes Directory
        • Services
          • Oracles
        • Sample Boxes
        • Other Boxes
          • DAPP Network
          • SDKs
            • ETH-SDK
            • EOS SDK
          • Frontends
          • Extensions
          • Tests
          • Seeds
          • Microservices
          • Meta Boxes
          • Libraries
          • Game
          • EOS Framework
          • Economics
          • Templates
      • Add/Remove
      • Deploy
      • List Boxes
  • ⚙️DAPP Network Services
    • DAPP Network Services
      • vRAM
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
          • Basic implementation
        • Smart Contract Macros
          • dapp::multi_index
        • Tools
          • DAPP Client Integration
            • get_vram_row
          • Zeus Commands
          • Scripts
            • Get table
            • Get ordered keys
        • Additional Features
          • Save load and reset dapp::multi_index data
          • Advanced Features
      • LiquidAccounts
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
            • DAPP Client
          • Basic Implementation
          • DAPP Account
        • Smart Contract Macros
          • payload
          • VACCOUNTS_APPLY
          • require_vaccount
          • VACCOUNTS_DELAYED_CLEANUP
        • Tools
          • DAPP Client Integration
            • push_liquid_account_transaction
          • Zeus Commands
            • Zeus vaccounts push-action
          • Scripts
            • Deserialize Payload
        • Use between contracts
        • Use Between Chains
      • LiquidHarmony
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
          • Basic Implementation
          • API DSP Key Storage
        • Smart Contract Macros
          • geturi
          • ORACLE_HOOK_FILTER
        • Creating an Oracle Request
          • HTTP/HTTPS GET/POST JSON
            • HTTP/HTTPS GET
            • HTTP/HTTPS GET JSON
            • HTTP/HTTPS POST
            • HTTP/HTTPS POST JSON
          • ECHO GET/POST JSON
            • ECHO GET
            • ECHO GET JSON
            • ECHO POST
            • ECHO POST JSON
          • Nodeos History Get
          • Sister Chain Fetch
            • sister_chain_block
            • sister_chain_history
            • sister_chain_info
            • sister_chain_last_irreversible
            • sister_chain_table_row
          • Foreign Chain Fetch
            • ethereum
              • endpoints
              • block_number
              • history
              • balance
              • storage
            • tron
              • endpoints
              • balance
              • block_number
              • block
              • transactions
              • transaction
            • cardano
              • endpoints
              • blocks
              • history
              • state
            • ripple
              • endpoints
              • balance
              • ledger
              • transactions
            • bitcoin
              • endpoints
              • balance
              • block
              • history
              • transaction
            • litecoin
              • endpoints
              • balance
              • block
              • history
              • transaction
            • bitcoin cash
              • endpoints
              • balance
              • block
              • history
              • transaction
          • Wolfram Alpha
          • Random Number
          • Stockfish
          • SQL
        • Additional Features
          • Pre geturi hook
          • Don't spend CPU condition
      • LiquidScheduler
        • Getting Started Guide
          • Compile and Deploy
          • Staking for Services
          • Basic Implementation
        • Smart Contract Macros
          • schedule_timer
          • remove_timer
          • timer_callback
          • start_interval
          • remove_interval
        • Additional Features
          • Don't spend CPU condition
      • LiquidStorage
        • Getting Started Guide
          • Compile and Deploy
          • Staking for Services
          • Test
          • Basic Implementation
        • Tools
          • Zeus Commands
            • zeus storage upload
            • zeus storage unpin
          • DAPP Client Integration
            • get_uri
            • unpin_public_file
            • upload_archive_to_liquidstorage
            • upload_file_to_liquidstorage
            • upload_public_file_from_vaccount
        • Example GET Static Web Page
      • LiquidLink
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
          • Basic Implementation
        • Smart Contract Macros
          • svc_sign_signtrx
      • LiquidAuth
        • Getting Started Guide
          • Compile and Deploy
          • Staking for services
          • Test
          • Basic Implementation
        • Tools
          • DAPP Client Integration
            • invokeAuthedCall
      • DAPP Service Macros
        • CONTRACT_START
        • CONTRACT_END
        • DAPPSERVICES_ACTIONS
        • DAPPSERVICE_ACTIONS_COMMANDS
      • Additional Services
      • Smart Contract Console Log Syntax
      • Using on_notify with services
    • Packages and Staking
  • 👨‍🚀DAPP Service Providers
    • Introduction to DAPP Service Providers
    • DSPs
      • Architecture Overview
      • Setup DSP
        • Blockchain Account
        • EOSIO Node
          • Firehose Setup
        • IPFS
          • Adding peers
            • Reconnecting Peers Periodically
          • Bootsrapping from an existing IPFS Cluster
          • Running a private network
        • PostgreSQL Database Backend
          • How to wipe local database
        • Ethereum Virtual Machine Node Setup
        • DSP Node
          • Logs
            • Monitor all logs script
        • Register Package
          • Modify Package metadata
          • Enable/Disable Package
          • Update cost per action in QUOTA
          • More on Packages
          • Whitelist Stakers
        • Test Setup
        • Known attack vectors
      • DSP Maintenance
        • Upgrade DSP Node
        • Claim Rewards
        • Replay Contract
        • Cleanup IPFS and Oracle Entries
        • Consumer Pays CPU Permissions
      • DSP API Endpoints
        • Event
        • Version
        • vRAM
        • LiquidLink
        • LiquidStorage
        • LiquidAccounts
  • 👨‍💻DAPP NETWORK LABS
    • Introduction
    • DAPP Workers
    • EdgeDSPs
    • EdgeOS
  • 🌉CROSS CHAIN BRIDGES
    • Getting Started with LiquidBridge
      • EOSIO.token <> EOSIO.token Fungible Tokens
      • EOSIO.token <> ERC20 Fungible Tokens
        • EOSIO Side Setup
        • EVM Side Setup
          • Setup EVM Contracts
            • Setup EVM Token Contract
              • Initialize Token and Transfer Ownership
            • Setup EVM Tokenpeg Contract
            • Verify and Publish Source Code
              • token contract and overview
              • tokenpeg contract
        • Initialize EOSIO Side
        • Test bridge
      • EOSIO <> EOSIO Atomic Assets Non-Fungible Tokens
      • EOSIO Atomic Assets <> ERC721 Non-Fungible Tokens
        • EOSIO Side Setup
        • EVM Side Setup
          • Setup EVM ERC721 Contract
          • Setup EVM Atomictokenpeg Contract
          • Transfer Ownership
          • Verify Source Code
        • Initialize EOSIO Side
        • Test bridge
      • EOSIO Atomic Assets <> ERC1155 Non-Fungible Tokens
        • EOSIO Side Setup
        • EVM Side Setup
          • Setup Proxy Contract
          • Setup EVM ERC1155 Contract
          • Setup EVM ERC1155 Tradeable Contract
          • Transfer Ownership of ERC1155 contract to atomictokenpeg1155 contract
        • Initialize EOSIO Side
        • Test bridge
  • ⛓️LiquidX Stake Across Chains
    • Getting Started with LiquidX
      • Use DAPP Network Services
        • Smart Contract Steps
        • Add DSP on New Chain
        • Map Mainnet to New Chain
        • Map New Chain to Mainnet
      • Become a DSP on another chain
        • Editing config.toml file
        • Push DSP account mapping action
      • Example Chains to Add
        • CoVax
        • WAX
        • WAX Test
        • Telos
        • Telos Test
        • BOS
      • Add a Chain to LiquidX
        • Create accounts and set dappservicex contract
        • Register chain
  • 😷COVAX
    • Getting Started with CoVax Chain
      • Become a DAPP Service Provider
      • Become a Block Producer
  • 🗂️Blockchain Guides
    • Testnet Creation Guides
      • Create Binance Smart Chain Testnet Account
        • Add Binance Smart Chain Testnet Network to Metamask
        • Create EVM keypair
        • Get faucet funds
      • Create WAX Testnet Account
      • Creating Jungle 3 account
      • Create Mumbai Testnet Account (Matic-Polygon)
        • Get faucet funds
      • Creating CryptoKylin Account
      • Create Rinkeby Testnet Account
        • Change Metamask network to Rinkeby
        • Get faucet funds
    • Governance Guides
      • How to submit a proposal
      • How the Proposal System Works
      • Governance Rewards
      • How to Propose an MSIG
      • Update dappservices contract by msig
      • Setup MSIG Telegram Bot
      • Governance Contracts
      • Governance Frontend
      • Propose Payment by Msig
  • 🗒️Release Notes
    • Latest
    • History
      • 2.0.8191
      • 2.0.7966
      • 2.0.7931
      • 2.1.7848
      • 2.0.7735
      • 2.0.7661
      • 2.0.7644
      • 2.0.7622
      • 2.1.7420
      • 2.1.7301
      • 2.1.7111
      • 2.0.6808
      • 2.0.5328
      • 2.0.4719
      • 2.0.4002
      • 2.0.3107
      • 2.0.2812
      • 2.0.2527
  • 🙋‍♀️FAQs
    • Frequently Asked Questions The DAPP Token
    • Frequently Asked Questions DAPP Service Providers (DSPs)
    • Frequently Asked Questions vRAM
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On this page
  • LiquidScheduler Getting Started
  • Prerequisites
  • Unbox LiquidScheduler DAPP Service box

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  1. DAPP Network Services
  2. DAPP Network Services
  3. LiquidScheduler

Getting Started Guide

PreviousLiquidSchedulerNextCompile and Deploy

Last updated 4 years ago

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LiquidScheduler Getting Started

  _       _                   _       _   ____           _                  _           _               
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 | |     | |  / _` | | | | | | |  / _` | \___ \   / __| | '_ \   / _ \  / _` | | | | | | |  / _ \ | '__|
 | |___  | | | (_| | | |_| | | | | (_| |  ___) | | (__  | | | | |  __/ | (_| | | |_| | | | |  __/ | |   
 |_____| |_|  \__, |  \__,_| |_|  \__,_| |____/   \___| |_| |_|  \___|  \__,_|  \__,_| |_|  \___| |_|   
                 |_|                                                                                    

LiquidScheduler is an on chain scheduling solution for EOS based actions.

The service has 2 parts, a transaction scheduler, and an interval. The scheduler is used for scheduling actions to take place in the future and the interval may be used for running services on a reliable cron such as a price feed.

LiquidScheduler takes a name timer, a std::vector<char> payload object, and an uint32_t seconds interval/deferred schedule time as its parameters. Multiple timers may be used within the same contract. For example, if a contract deals with multiple accounts, a timer can be set up for each account. The payload parameter can be used to pass data to the timer_callback function, (or start_interval for intervals) which is used to run the scheduled task/interval. At the end of the timer_callback is a return response to reschedule the transaction if needed. If the return is truthy, the task will reschedule again based on the interval passed, if it is false, the task will not be rescheduled.

Currently there can only be 1 timer_callback so it is recommended to separate the schedule and interval services into separate contracts if needed.

One use case would be setting up LiquidHarmony (oracle) fetches on a continual basis. An example of this can be seen in the which fetches 3 prices on an infinite loop.

Another great place to understand the service is in the .

The price feed example uses LiquidHarmony web oracles and the LiquidScheduler to periodically update a price on chain only when the new price is more or less than 1% of the last updated price, conserving CPU by only running actions when necessary. See

Prerequisites

  • - Zeus installs eos and the eosio.cdt if not already installed

Unbox LiquidScheduler DAPP Service box

This box contains the LiquidScheduler smart contract libraries, DSP node logic, unit tests, and everything else needed to get started integrating / testing the DAPP Network LiquidScheduler in your smart contract.

mkdir cron-dapp-service; cd cron-dapp-service
# npm install -g @liquidapps/zeus-cmd
zeus box create
zeus unbox cron-dapp-service
zeus test -c
⚙️
portfolio example
unit tests
here
Zeus
Kylin Account