Getting data from Oracles

Users can utilize purchased data from Zap Oracles in their dapps or apps. Zap provides templates for offchain and onchain solutions

Zap Oracles will need to define the data structure they provide in their responses. Users can look up the information in https://admin.zap.org or Oracle's own source if they provide one.
Onchain solution 
Dapps can receive data from Zap Oracles by simply implementing callback method that match the data type users expect from the Oracle.  Zap platform provides multiple types of responses : 
Response method
Response Type
Callback to implement
respondBytes32Array
bytes32[]
callback(id, response)
respondIntArray
int[]
callback(id, response)
respond1
string
callback(id, response1)
respond2
(string, string)
callback(id, response1, 2)
respond3
(string, string, string)
callback(id, response1, 2, 3, 4)
respond4
(string, string, string, string)
callback(id, response1, 2, 3, 4)
Check out Onchain subscriber example for solidity code example of dapps that use data from Zap Oracles
Offchain solution
If User's address is not a contract address, all above response method will automatically emit Event of responses instead of calling callback method. User can listen to Events for each method to receive data offchain. Following table includes all offchain events with response method
Response method
Event
respondBytes32
OffchainResponse
respondIntArray
OffchainResponseInt
respond1
OffchainResult1
respond2
OffchainResult2
respond3
OffchainResult3
respond4
OffchainResult4
​
Check out Offchain Subscriber Example for code example of receiving offchain responses

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Last updated 2 years ago

Response method	Response Type	Callback to implement
`respondBytes32Array`	`bytes32[]`	`callback(id, response)`
`respondIntArray`	`int[]`	`callback(id, response)`
`respond1`	`string`	`callback(id, response1)`
`respond2`	`(string, string)`	`callback(id, response1, 2)`
`respond3`	`(string, string, string)`	`callback(id, response1, 2, 3, 4)`
`respond4`	`(string, string, string, string)`	`callback(id, response1, 2, 3, 4)`

Response method	Event
`respondBytes32`	`OffchainResponse`
`respondIntArray`	`OffchainResponseInt`
`respond1`	`OffchainResult1`
`respond2`	`OffchainResult2`
`respond3`	`OffchainResult3`
`respond4`	`OffchainResult4`