the error seems to be with the "payable". Not enough eth on metamask isn't the problem.
I'm testing with the youtube views contract example: https://github.com/provable-things/ethereum-examples/blob/master/solidity/YoutubeViews.sol
I'm testing with the youtube views contract example: https://github.com/provable-things/ethereum-examples/blob/master/solidity/YoutubeViews.sol
pragma solidity >= 0.5.0 < 0.6.0;
import "github.com/provable-things/ethereum-api/provableAPI_0.5.sol";
contract YoutubeViews is usingProvable {
string public viewsCount;
event LogYoutubeViewCount(string views);
event LogNewProvableQuery(string description);
function __callback(
bytes32 _myid,
string memory _result
)
public
{
require(msg.sender == provable_cbAddress());
viewsCount = _result;
emit LogYoutubeViewCount(viewsCount);
// Do something with viewsCount, like tipping the author if viewsCount > X?
}
function update()
public
payable
{
emit LogNewProvableQuery("Provable query was sent, standing by for the answer...");
provable_query("URL", 'html(https://www.youtube.com/watch?v=9bZkp7q19f0).xpath(//*[contains(@class, "watch-view-count")]/text())');
}
constructor()
public
{
update()
}
}
TypeError: Overriding function is missing "override" specifier.
function callback(
^ (Relevant source part starts here and spans across multiple lines).
github.com/provable-things/ethereum-api/blob/master/provableAPI_0.6.sol:359:5: Overridden function is here:
function callback(bytes32 _myid, string memory _result) virtual public {
^ (Relevant source part starts here and spans across multiple lines).
function callback(
^ (Relevant source part starts here and spans across multiple lines).
github.com/provable-things/ethereum-api/blob/master/provableAPI_0.6.sol:359:5: Overridden function is here:
function callback(bytes32 _myid, string memory _result) virtual public {
^ (Relevant source part starts here and spans across multiple lines).
@oraclize-support every once in a while, I see a HTTP query error for a URL that is correctly working otherwise. Is this is a provable issue ? Please see the log below from ethereum-bridge 5998c8 HTTP query result:
{
"result": {
"_timestamp": 1632625814,
"id": "cdbf9974417cd837613899afdfe6db6d67443d5587e9a81c99c8f0036f5998c8",
"daterange": [
1632625808,
1632627608
],
"_lock": false,
"id2": "480275701fa7888931d79d0e49ab5ab2662062936b42a14e8a06c70103c47326",
"actions": [],
"interval": 3600,
"checks": [
{
"errors": [
"ReadTimeout",
"parsing_helper.wrong_path"
],
"success": true,
"timestamp": 1632625813,
"results": [
""
],
"proofs": [
null
],
"match": true
}
],
"version": 3,
"_timestamp_creation": 1632625808,
"context": {
"protocol": "eth",
"relative_timestamp": 1632625805, "type": "blockchain",
"name": "eth_9DE4150C94"
},
"active": false,
"hidden": false,
"payload": {
"conditions": [
{
"query": "json(https://via-oracle.azurewebsites.net/rates/er/VXUSD_to_VXEUR).rate",
"proof_type": 0,
"check_op": "tautology",
"datasource": "URL",
"value": null
}
]
}
},
"success": true
}
[2021-09-26T03:10:14.356Z] ERROR HTTP query error
[
"ReadTimeout",
"parsing_helper.wrong_path"
]
{
"result": {
"_timestamp": 1632625814,
"id": "cdbf9974417cd837613899afdfe6db6d67443d5587e9a81c99c8f0036f5998c8",
"daterange": [
1632625808,
1632627608
],
"_lock": false,
"id2": "480275701fa7888931d79d0e49ab5ab2662062936b42a14e8a06c70103c47326",
"actions": [],
"interval": 3600,
"checks": [
{
"errors": [
"ReadTimeout",
"parsing_helper.wrong_path"
],
"success": true,
"timestamp": 1632625813,
"results": [
""
],
"proofs": [
null
],
"match": true
}
],
"version": 3,
"_timestamp_creation": 1632625808,
"context": {
"protocol": "eth",
"relative_timestamp": 1632625805, "type": "blockchain",
"name": "eth_9DE4150C94"
},
"active": false,
"hidden": false,
"payload": {
"conditions": [
{
"query": "json(https://via-oracle.azurewebsites.net/rates/er/VXUSD_to_VXEUR).rate",
"proof_type": 0,
"check_op": "tautology",
"datasource": "URL",
"value": null
}
]
}
},
"success": true
}
[2021-09-26T03:10:14.356Z] ERROR HTTP query error
[
"ReadTimeout",
"parsing_helper.wrong_path"
]
Hello @kallolborah, are you sure that such api call doesn’t timeout (as the error suggests) every now and then? If it sometimes need more than X seconds (20 iirc) provable will fail and return an empty answer. Please make sure the apicall always returns in a short period of time.
@oraclize-support thanks, the API timeout duration is set to 90 secs, but in these http query error cases, they return almost immediately. Not sure what is happening but we will check again. Another question I have is - is OAR required for ropsten/testnet deployment ? For some reason, the oracle service does not seem to be working on testnet.
Is Provable work well on TESTNET?
so...is provable depreciated beyond reasonable use? Looks like the testnet is down, and I can't find any examples that will compile. Even the 0.4.22 versions on docs.provable.com fail as the import line to "github.com/provable-things/ethereum-api/provableAPI_0.4.25.sol"; no longer works...
@gwills:[matrix.org](http://matrix.org) probably remix doesn't support github sym link anymore. Try to replace the import string with the following one:
import "github.com/provable-things/ethereum-api/provableAPI_0.5.sol";
This should compile fine
@oraclize-support I am not sure if it is working. https://kovan.etherscan.io/address/0x8ebca32bd42d86ee51f762e968667e40b612b6f1
No callback called for the last 7 days.
where can I see if your Smart Contracts execute callbacks ?
It would make things much easier if I can see if there was some issue in my function or you just don't call the callback. I thought this address is somethign I can use: https://kovan.etherscan.io/address/0x8ebca32bd42d86ee51f762e968667e40b612b6f1 Because this is the SC which executes callback. I think...
@oraclize-support the query I mentioned in my comment above should've executed about 20 minutes ago, but that hasn't happened. Can you guys please give me some assistance with this? We're talking about 0.3 ETH here so it's not a huge amount of money but it would be GREAT if there was some way to recover it.
That's the transaction where the query was created. If there's a way for you guys to force query execution to return a particular result, PLEASE let me know before doing it!
@nicolas-siplis we cannot forge any result unless this is what your contract queries asked for. If you are missing a mainnet result we need to dive deeper to see ifthe error was in your or our end. We’ll look into it and let you know. Feel free to send us an email to info@provable.xyz too, thanks
@nicolas-siplis the calback was just sent. It wasn't sent as you haven't specified any gasprice so the default free one of 20 gwei got used, which is insufficient to get the tx accepted by nodes as the baseprice is currently much higher than that. We have sent it back to your contract with 120 gwei of gasprice paying out the gas for that tx put of our pocket, for the future please select the correct gasprice when sending the query (as recommended by the documentation). Callback tx: https://etherscan.io/tx/0x90034ade4512ac63a7cc201e68011c9a766e0d3a2252103f0f94460ea5e7227d
Hello. Does anyone have a working remix example of getting site data using xpath? I am trying to reproduce https://github.com/provable-things/ethereum-examples/blob/master/solidity/YoutubeViews.sol and deploy to Kovan testnet. It's running without errors but, I can't wait results, they are blank, it's seems __callback does not event start. (I slightly changed xpath to a new manner but it still not works)
Hi @NazarovALAL, unfortunately YouTube doesn't provide the same HTML code you see when accessing the page through your browser, hence why the xpath clause fails to get the views. This happened to other users before and the code there is a bit out of date for that purpose but still valid as an example if you want to access an HTML through .xpath().
You can do a test by looking for an website where you get the same HTML by other means other than the browser (using curl or wget for example)
@oraclize-support Hi, ty for answer, as I said I changed xpath for new version of youtube. Actually example with "provable_query("WolframAlpha", "temperature in London");" was working yesterday, but today, like in the example with YouTube I can't wait response, maybe temporary problems
Yeah tried that but 0.001 ETH is too low for my needs. Found https://app.mycrypto.com/faucet which gives 0.01 3 times, which is just enough!
