On total this was good random thing, now I've ethereum bridge over ganache for testing..
Hi , i would like to send my api key with headers in following function(taken from oraclizeAPI.sol):
function oraclize_query(string memory _datasource, string[4] memory _args, uint _gasLimit) oraclizeAPI internal returns (bytes32 _id) {
string[] memory dynargs = new string[](4);
dynargs[0] = _args[0];
dynargs[1] = _args[1];
dynargs[2] = _args[2];
dynargs[3] = _args[3];
return oraclize_query(_datasource, dynargs, _gasLimit);
}Please take a moment and answer my queries are as follows:
- What i have to pass as _args[0], assuming _args[1] is GET/POST , _args[2] is end-point and _args[3] is headers.
- And also please lemme know the way i'm sending the below headers string is correct or not
'headers': {'content-type': 'json','api_key':'12D3KooWKSCBHqn42BckRwqQNRfLN64f9yH1SwnxNMzgrjQgV7Nm'}
@its-VSP - in order for you to post custom headers & post requests in your Provable query, you're going to have to leverage the computation datasource. The easiest way to get started on that is to look at our example for sending custom URL headers here: https://github.com/provable-things/ethereum-examples/tree/master/solidity/computation-datasource/url-requests
That example, combined with our documentation regarding the computation datasource should see you be able to complete your query.
@oraclize-support , I'm referring to example in the link you provided.,
request("QmdKK319Veha83h6AYgQqhx9YRsJ9MJE7y33oCXyZ4MqHE",
"GET",
"http://httpbin.org/basic-auth/myuser/secretpass",
"{'auth': ('myuser','secretpass'), 'headers': {'content-type': 'json'}}"
);above function is making use of overloaded version of oraclize_query with string array of length 4 as a last parameter
would like to know why some CID is passed in index 0
Yes, So i guess that field is not mandatory
And i can just send method,end-point and headers as string array of length 3.,which may look like ```
provable_query(60,"computation",[
"GET",
"<end-point>",
"{'headers': {'content-type': 'json','api_key':'12D3KooWKSCBHqn42BckRwqQNRfLN64f9yH1SwnxNMzgrjQgV7Nm'}}"
])
```
Please lemme know if it works , thanks in advance
- So what need to be there inside achieve.zip/dockerfile.
- Is this the only way to send custom headers?
- I'm just wondering will below code automatically sends our custom headers
request("json(QmdKK319Veha83h6AYgQqhx9YRsJ9MJE7y33oCXyZ4MqHE).headers", "GET", "http://httpbin.org/headers", "{'headers': {'content-type': 'json'}}" );
Hello @marcoaureliosequeria - since you're using Ganache you must be working locally, which means you need to be using the ethereum-bridge tool in order to create the link to the Provable service from your private ganache chain. Whilst we don't have any examples using Ganache specifically, we do have examples showing you how to use our service locally in a Truffle environment, which will likely be of great help to you! You can find the Truffle DieselPrice example here: https://github.com/provable-things/ethereum-examples/tree/master/solidity/truffle-examples/diesel-price
If you follow the README you'll see how the ethereum-bridge fits in and thus be able to run your own queries locally too!
@oraclize-support , please guide me in how i can use computation in my particular context ie., sending the custom headers.
My observations and questions :
headers are not static , as you know api_key is meant for authorise the developer.
Dockerfile is there to package our script and make environment, so i would like to know what would be the script i should write there (in sending custom headers)?
If executing the request is the script i should write, how i can send the custom headers from smart contract to that particular script.
@its-VSP - via the computation datasource you can do _anything._ So you can write whatever script you want in whatever langauge you want (just provided the correct environment for that language via the docker container).
The url-requests example given is python to make url-requests with custom headers, so that example is a great fit for you to see how to do it. The gist of it is that you send whatever params you want for your script from the smart-contract in solidity (so you API token for example). With the compuation datasource you then end up with those params inside your docker container for your script to work with, at which point you can do anything!
So you'd likely want to make your requests from that script using your custom headers that got passed in from solidity, then martial the response, parse our the bits you want, then print that as the final line in your script. That is then what will be returned to your smart-contract!
url-request example you will see how the arguments are passed. Look at the arguments sent via solidity (that you copy and pasted here) and then look at how those variables are accessed again in the python script inside the docker to see how you can get hold of yours. They get passed to your compuation as environment variables ! Also, you can pass more of fewer variables if need be - whatever you need!
have another question but i don't know whether it is applicable or not.
Is there a way i can add my achieve.zip in private ipfs and pass that CID along with url that is hosting that private IPFS to
oraclize_query
@oraclize-support , i have tried computation datasource but didn't got response back.
Apart from that i have copy pasted the same source-code that is there in streamr for which i got the response and CID : QmWFV2UrcUFMFk5R4iTZdusTRsvqohFwHjyXNH1Yu9v3Nm but when i have added the same zip folder myself i got Qmbx5tPsyeoykCBLqAbLpLPNgm7957NTUrYchmfdzHTnhuback and used in contract, the callback is never getting called(got to know after tracking the tx in etherscan)
how to debug what went wrong?
Do you have any query reference relative to the url-request sample?
i'm already working on this, we can achieve this using
computation data source of provable.Checkout examples that are using computation datasource
@oraclize-support , i have got a hands on with computation data-source
but when i made the external-api call dynamic ...
_callback had failed due to out of gas but i had sent ~1ether to contract
but the query had returned a hex string when did ascii conversion got a weird encoded string.
If you don't mind , can you help me in debugging this.