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useDQLQuery.ts
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useDQLQuery.ts
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import { useEffect, useState } from 'react';
import { queryExecutionClient, QueryResult, QueryState } from '@dynatrace-sdk/client-query';
/**
* useDQLQuery: hook to fetch data from Grail via @dynatrace-sdk/client-query
* @example
* const [result, loading] = useDQLQuery(query);
*/
export const useDQLQuery = (dqlQuery: string): [QueryResult | null, boolean] => {
const [result, setResult] = useState<QueryResult | null>(null);
const [isLoading, setIsLoading] = useState<boolean>(false);
useEffect(() => {
setIsLoading(true);
query(dqlQuery)
.then((result) => {
if (result) {
setResult(result);
}
})
.catch((e) => console.error(e))
.finally(() => setIsLoading(false));
}, [dqlQuery]);
return [result, isLoading];
};
const MAX_GRAIL_POLLING_RETRIES = 10;
async function query(query: string) {
const { state, requestToken, result } = await queryExecutionClient.queryExecute({ body: { query } });
if (state === QueryState.Succeeded) {
return Promise.resolve(result);
}
if (!requestToken) {
throw new Error('Query did not succeed and provided no request-token for future polling');
}
const abortQuery = async () => {
try {
await queryExecutionClient.queryCancel({ requestToken });
} catch (e) {}
};
let retries = 0;
while (retries < MAX_GRAIL_POLLING_RETRIES) {
const pollResponse = await queryExecutionClient.queryPoll({ requestToken });
switch (pollResponse.state) {
case QueryState.Succeeded:
return pollResponse.result;
case QueryState.NotStarted:
case QueryState.Running:
retries++;
// eslint-disable-next-line @typescript-eslint/no-empty-function
await new Promise((resolve) => setTimeout(resolve, 1_000));
break;
default:
abortQuery();
return undefined;
}
}
}