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import { AsyncDuckDB, AsyncDuckDBConnection } from "@duckdb/duckdb-wasm";
import { useCallback, useEffect, useRef, useState } from "react";
// https://duckdb.org/docs/api/wasm/query#arrow-table-to-json
// TODO: import the arrow lib and use the correct type
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const arrowResultToJson = (arrowResult: any) => {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return arrowResult.toArray().map((row: any) => row.toJSON()) || [];
};
export const useParquetTable = (
db: AsyncDuckDB | null,
{
datasetUrl,
datasetQuery,
setDatasetQuery: _setDatasetQuery,
onQueryChanged,
}: {
datasetUrl: string;
datasetQuery: string;
setDatasetQuery: (query: string) => void;
onQueryChanged?: (query: string) => void;
}
) => {
const [datasetLoaded, setDatasetLoaded] = useState(false);
const [loading, setLoading] = useState(false);
const [querying, setQuerying] = useState(false);
const [dataset, setDataset] = useState<null>(null);
const [error, setError] = useState<string | null>(null);
const onQueryChangedRef = useRef(onQueryChanged);
useEffect(() => {
onQueryChangedRef.current = onQueryChanged;
}, [onQueryChanged]);
const datasetQueryRef = useRef(datasetQuery);
useEffect(() => {
datasetQueryRef.current = datasetQuery;
}, [datasetQuery]);
const setDatasetQuery = useCallback(
(query: string) => {
_setDatasetQuery(query);
onQueryChangedRef.current?.(query);
},
[_setDatasetQuery, onQueryChangedRef]
);
const clearDataset = useCallback(() => {
setDataset(null);
setError(null);
}, []);
const loadDataset = useCallback(() => {
if (db && datasetUrl) {
setLoading(true);
setDataset(null);
setError(null);
setDatasetLoaded(false);
console.log("Loading", datasetUrl);
const status: { conn: AsyncDuckDBConnection | null; killed: boolean } = {
conn: null,
killed: false,
};
db.connect().then((conn) => {
if (status.killed) {
conn.close();
return;
}
status.conn = conn;
conn
// we get httpfs for free with cors restrictions
// we get parquet downloaded as we load it
// https://duckdb.org/docs/api/wasm/extensions
// https://duckdb.org/docs/api/wasm/data_ingestion#parquet
.query(
`LOAD parquet;LOAD httpfs;DROP TABLE IF EXISTS dataset;CREATE TABLE dataset AS SELECT * FROM '${datasetUrl}';`
)
.then(() => {
setDatasetLoaded(true);
if (!datasetQueryRef.current) {
console.log("Setting default query");
setDatasetQuery(`SELECT * FROM dataset LIMIT 10;`);
}
})
.catch((err) => {
console.error(err);
setError(err.message);
setDataset(null);
setDatasetLoaded(false);
setDatasetQuery("");
})
.finally(() => {
conn.close();
setLoading(false);
});
});
return () => {
status.killed = true;
if (status.conn) {
console.log("Closing connection");
status.conn.close();
}
};
} else if (db) {
console.log("Resetting db");
setDataset(null);
setError(null);
setDatasetLoaded(false);
setDatasetQuery("");
db.reset();
}
}, [db, datasetUrl, setDatasetQuery, datasetQueryRef]);
const performQuery = useCallback(
(query: string) => {
if (db && datasetLoaded) {
setQuerying(true);
db.connect()
.then((conn) => {
conn
.query(query)
.then((result) => setDataset(arrowResultToJson(result)))
.catch(setError);
})
.finally(() => setQuerying(false));
}
},
[db, datasetLoaded]
);
useEffect(() => {
if (datasetLoaded && datasetQuery) {
performQuery(datasetQuery);
}
}, [datasetLoaded, datasetQuery, performQuery]);
useEffect(() => {
loadDataset();
}, [loadDataset]);
return {
loading,
dataset,
error,
clearDataset,
loadDataset,
querying,
performQuery,
};
};
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