Basic Implementation

LiquidHarmony Consumer Example Contract used in unit tests
in zeus_boxes/contracts/eos/oracleconsumer/oracleconsumer.cpp The consumer contract is a great starting point for playing around with the LiquidHarmony syntax.
1
/* INCLUDE ORACLE LOGIC */
2
#include "../dappservices/oracle.hpp"
3
​
4
/* ADD DAPP NETWORK RELATED ORACLE ACTIONS */
5
#define DAPPSERVICES_ACTIONS() \
6
  XSIGNAL_DAPPSERVICE_ACTION \
7
  ORACLE_DAPPSERVICE_ACTIONS
8
​
9
#define DAPPSERVICE_ACTIONS_COMMANDS() \
10
  ORACLE_SVC_COMMANDS() 
11
​
12
#define CONTRACT_NAME() oracleconsumer 
13
​
14
CONTRACT_START()
15
​
16
  /* 
17
  
18
    testget - provide a URI using the DAPP Network Oracle syntax and an expected result, 
19
    if the result does not match the expected field, the transaction fails 
20
    
21
    testrnd - fetch oracle request based on URI without expected field assertion
22
  
23
  */
24
​
25
 [[eosio::action]] void testget(std::vector<char>  uri, std::vector<char> expectedfield) {
26
    /* USE EOSIO'S ASSERTION TO CHECK FOR REQUIRED THREHSHOLD OF ORACLES IS MET */
27
    eosio::check(getURI(uri, [&]( auto& results ) { 
28
      eosio::check(results.size() > 0, "require multiple results for consensus");
29
      auto itr = results.begin();
30
      auto first = itr->result;
31
      ++itr;
32
      /* SET CONSENSUS LOGIC FOR RESULTS */
33
      while(itr != results.end()) {
34
        eosio::check(itr->result == first, "consensus failed");
35
        ++itr;
36
      }
37
      return first;
38
    }) == expectedfield, "wrong data");
39
  }
40
  
41
  [[eosio::action]] void testrnd(std::vector<char> uri) {
42
    getURI(uri, [&]( auto& results ) { 
43
      return results[0].result;
44
    });
45
  }
46
CONTRACT_END((testget)(testrnd))
Copied!

Test

API DSP Key Storage

Last modified 1yr ago

Copy link