@tableau/taco-toolkit
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Tableau Connector Toolkit
377 lines • 26.2 kB
JavaScript
"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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};
Object.defineProperty(exports, "__esModule", { value: true });
exports.CsvTacoParser = void 0;
var parseCSV = __importStar(require("csv-parse"));
var fs_1 = __importDefault(require("fs"));
var papaparse_1 = __importDefault(require("papaparse"));
var readline = __importStar(require("readline"));
var column_header_property_1 = require("../../../../shared/enums/column-header-property");
var parse_utils_1 = require("../../../utils/parse-utils");
var eps_logger_1 = require("./../../../logging/eps-logger");
var base_taco_file_parser_1 = require("./base-taco-file-parser");
// csv-parse lib is 1-based indexing
var FIRST_DATA_ROW_INDEX = 2;
var DEFAULT_DELIMITER = ',';
var CsvTacoParser = /** @class */ (function (_super) {
__extends(CsvTacoParser, _super);
function CsvTacoParser(tempDataManager, extractorId, filename) {
var _this = _super.call(this) || this;
_this.tempDataManager = tempDataManager;
_this.extractorId = extractorId;
_this.filename = filename;
_this.filepath = _this.tempDataManager.getTempDataFilePath(_this.extractorId, _this.filename);
return _this;
}
/**
* Get ColumnHeaders for a CSV file.
*
* By default, it returns all column header fields and all columns are typed as string.
* If columns metadata is set by setColumnHeaders, it will filter the columns with the given columnHeaders,
* while the column order from the file is still preserved.
*/
CsvTacoParser.prototype.getColumnHeaders = function () {
return __awaiter(this, void 0, void 0, function () {
var columnNames, columnHeaders, columnNames_1, columnNames_1_1, columnName, columnHeader;
var e_1, _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0: return [4 /*yield*/, this.getColumnNamesFromFile()
// empty file
];
case 1:
columnNames = _b.sent();
// empty file
if (columnNames.length === 0) {
if (!this.columnHeaderMap) {
throw new Error('Failed to find column headers from ingested data. If the table empty, ' +
'column headers must be provided via DataContainer.');
}
return [2 /*return*/, Array.from(this.columnHeaderMap.values())];
}
// when columnHeaderMap is NOT present, all columns are selected as string type
if (!this.columnHeaderMap) {
return [2 /*return*/, columnNames.map(function (columnName) {
return { id: columnName, dataType: column_header_property_1.DataType.String };
})];
}
columnHeaders = [];
try {
for (columnNames_1 = __values(columnNames), columnNames_1_1 = columnNames_1.next(); !columnNames_1_1.done; columnNames_1_1 = columnNames_1.next()) {
columnName = columnNames_1_1.value;
columnHeader = this.columnHeaderMap.get(columnName);
if (columnHeader) {
columnHeaders.push(columnHeader);
}
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (columnNames_1_1 && !columnNames_1_1.done && (_a = columnNames_1.return)) _a.call(columnNames_1);
}
finally { if (e_1) throw e_1.error; }
}
return [2 /*return*/, columnHeaders];
}
});
});
};
/**
* Set columns metadata info to the parser. When columnHeaders are set, getColumnHeaders will
* respect the given info. Otherwise, all fields are assumed as string type.
*
* To prevent the method from being misused, this method can be called once, otherwise,
* it throws an error.
*/
CsvTacoParser.prototype.setColumnHeaders = function (columnHeaders) {
var e_2, _a;
if (this.columnHeaderMap) {
throw new Error('columnHeaders can be only set once.');
}
this.columnHeaderMap = new Map();
try {
for (var columnHeaders_1 = __values(columnHeaders), columnHeaders_1_1 = columnHeaders_1.next(); !columnHeaders_1_1.done; columnHeaders_1_1 = columnHeaders_1.next()) {
var columnHeader = columnHeaders_1_1.value;
var id = columnHeader.id;
if (this.columnHeaderMap.has(id)) {
throw new Error("Column name must be unique. Found duplicate column name '".concat(id, "'"));
}
this.columnHeaderMap.set(id, columnHeader);
}
}
catch (e_2_1) { e_2 = { error: e_2_1 }; }
finally {
try {
if (columnHeaders_1_1 && !columnHeaders_1_1.done && (_a = columnHeaders_1.return)) _a.call(columnHeaders_1);
}
finally { if (e_2) throw e_2.error; }
}
};
CsvTacoParser.prototype.getDelimiter = function () {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!(this.delimiter === undefined)) return [3 /*break*/, 2];
// parse out delimiter from header
return [4 /*yield*/, this.getColumnNamesFromFile()];
case 1:
// parse out delimiter from header
_a.sent();
_a.label = 2;
case 2: return [2 /*return*/, this.delimiter];
}
});
});
};
/**
* Get the set of data rows from the CSV file with the specified limit and offset.
*/
CsvTacoParser.prototype.getDataRows = function (limit, offset) {
return __awaiter(this, void 0, void 0, function () {
var columnNames, delimiter, hasMoreRows, data;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (limit < 1) {
throw new Error("CsvTacoParser.getNextDataRows(): limit value ".concat(limit, " should be greater than 0."));
}
if (offset < 0) {
throw new Error("CsvTacoParser.getNextDataRows(): offset value ".concat(offset, " should be greater than or equal to 0."));
}
// csv-parse lib is 1-based indexing
offset = offset + FIRST_DATA_ROW_INDEX;
return [4 /*yield*/, this.getColumnNamesFromFile()
// empty file
];
case 1:
columnNames = _a.sent();
// empty file
if (columnNames.length === 0) {
if (!this.columnHeaderMap) {
throw new Error('Failed to find column headers from ingested data. If the table empty, ' +
'column headers must be provided via DataContainer.');
}
// if columnHeaders is provided, it is valid empty table.
return [2 /*return*/, {
data: [],
hasMoreRows: false,
}];
}
return [4 /*yield*/, this.getDelimiter()];
case 2:
delimiter = _a.sent();
hasMoreRows = false;
return [4 /*yield*/, parseCsvFile(this.filepath, offset, limit + 1, delimiter)];
case 3:
data = _a.sent();
offset += limit;
if (data.length > limit) {
hasMoreRows = true;
data.pop();
}
else {
hasMoreRows = false;
}
if (this.columnHeaderMap) {
return [2 /*return*/, {
data: (0, parse_utils_1.composeDataRowsWithType)(data, columnNames, this.columnHeaderMap),
hasMoreRows: hasMoreRows,
}];
}
return [2 /*return*/, {
data: (0, parse_utils_1.composeDataRows)(data, columnNames),
hasMoreRows: hasMoreRows,
}];
}
});
});
};
CsvTacoParser.prototype.getColumnNamesFromFile = function () {
return __awaiter(this, void 0, void 0, function () {
var headerString, result, _a, delimiter, fields;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (this.headersFromFile && this.headersFromFile.length > 0) {
return [2 /*return*/, this.headersFromFile];
}
/*
papa-parse library does a better job in auto-detecting csv delimiter,
we are using this lib to get the delimiter from the header row and
use it to parse the rest of the file
*/
if (!fs_1.default.existsSync(this.filepath)) {
throw new Error("CsvTacoParser.getColumnNamesFromFile(): File does not exist." +
"Check the logs in case of any error during data ingestion." +
"If the source table is empty, consider using FetchUtils.ingestDataRows API.");
}
return [4 /*yield*/, getHeaderFromFile(this.filepath)];
case 1:
headerString = _b.sent();
result = papaparse_1.default.parse(headerString, { header: true });
_a = result.meta, delimiter = _a.delimiter, fields = _a.fields;
if (fields) {
this.delimiter = delimiter;
this.headersFromFile = fields;
}
else {
this.delimiter = DEFAULT_DELIMITER; // ','
this.headersFromFile = [];
}
return [2 /*return*/, this.headersFromFile];
}
});
});
};
// TO DO : Update this method when we implement csv parsing using duckdb
CsvTacoParser.prototype.getRowCount = function () {
return Promise.resolve(-1);
};
return CsvTacoParser;
}(base_taco_file_parser_1.TacoFileParser));
exports.CsvTacoParser = CsvTacoParser;
function parseCsvFile(filepath, start, count, delimiter) {
return new Promise(function (resolve, reject) {
var from = start;
var to = from + count - 1;
var rows = [];
fs_1.default.createReadStream(filepath)
.pipe(parseCSV.parse({
delimiter: delimiter,
from_line: from,
to_line: to,
skip_empty_lines: true,
}))
.on('data', function (row) {
rows.push(row);
})
.on('end', function () {
resolve(rows);
})
.on('error', function (error) {
eps_logger_1.Logger.error(error);
reject(error);
});
});
}
/**
* Get column headers (first line) from the file.
*
* If the file does NOT exist, we assume that errors occurred during ingestion,
* so the function rejects.
* If the connector has empty table, it should explicitly ingest an empty DataRow[].
*/
function getHeaderFromFile(filepath) {
return new Promise(function (resolve, reject) {
var firstLine = '';
// Create a readline interface for the file
var rl = readline.createInterface({
input: fs_1.default.createReadStream(filepath),
crlfDelay: Infinity,
});
// Listen for the 'line' event, which is emitted each time a line is read
rl.on('line', function (line) {
firstLine = line;
// Close the readline interface after the first line is read
rl.close();
});
rl.on('close', function () {
eps_logger_1.Logger.info("First line of CSV file: ".concat(firstLine));
resolve(firstLine);
});
rl.on('error', function (error) {
eps_logger_1.Logger.error(error);
reject(error);
});
});
}
//# 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NBQ2hGLENBQUE7eUJBQ0Y7d0JBRW9CLHFCQUFNLGlCQUFpQixDQUFDLElBQUksQ0FBQyxRQUFRLENBQUMsRUFBQTs7d0JBQXJELFlBQVksR0FBRyxTQUFzQzt3QkFDckQsTUFBTSxHQUFHLG1CQUFJLENBQUMsS0FBSyxDQUFXLFlBQVksRUFBRSxFQUFFLE1BQU0sRUFBRSxJQUFJLEVBQUUsQ0FBQyxDQUFBO3dCQUM3RCxLQUF3QixNQUFNLENBQUMsSUFBSSxFQUFqQyxTQUFTLGVBQUEsRUFBRSxNQUFNLFlBQUEsQ0FBZ0I7d0JBQ3pDLElBQUksTUFBTSxFQUFFOzRCQUNWLElBQUksQ0FBQyxTQUFTLEdBQUcsU0FBUyxDQUFBOzRCQUMxQixJQUFJLENBQUMsZUFBZSxHQUFHLE1BQU0sQ0FBQTt5QkFDOUI7NkJBQU07NEJBQ0wsSUFBSSxDQUFDLFNBQVMsR0FBRyxpQkFBaUIsQ0FBQSxDQUFDLE1BQU07NEJBQ3pDLElBQUksQ0FBQyxlQUFlLEdBQUcsRUFBRSxDQUFBO3lCQUMxQjt3QkFFRCxzQkFBTyxJQUFJLENBQUMsZUFBZSxFQUFBOzs7O0tBQzVCO0lBRUQsd0VBQXdFO0lBQ3hFLG1DQUFXLEdBQVg7UUFDRSxPQUFPLE9BQU8sQ0FBQyxPQUFPLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQTtJQUM1QixDQUFDO0lBQ0gsb0JBQUM7QUFBRCxDQUFDLEFBbkxELENBQW1DLHNDQUFjLEdBbUxoRDtBQW5MWSxzQ0FBYTtBQXFMMUIsU0FBUyxZQUFZLENBQUMsUUFBZ0IsRUFBRSxLQUFhLEVBQUUsS0FBYSxFQUFFLFNBQWlCO0lBQ3JGLE9BQU8sSUFBSSxPQUFPLENBQUMsVUFBQyxPQUFPLEVBQUUsTUFBTTtRQUNqQyxJQUFNLElBQUksR0FBRyxLQUFLLENBQUE7UUFDbEIsSUFBTSxFQUFFLEdBQUcsSUFBSSxHQUFHLEtBQUssR0FBRyxDQUFDLENBQUE7UUFDM0IsSUFBTSxJQUFJLEdBQWUsRUFBRSxDQUFBO1FBQzNCLFlBQUUsQ0FBQyxnQkFBZ0IsQ0FBQyxRQUFRLENBQUM7YUFDMUIsSUFBSSxDQUNILFFBQVEsQ0FBQyxLQUFLLENBQUM7WUFDYixTQUFTLEVBQUUsU0FBUztZQUNwQixTQUFTLEVBQUUsSUFBSTtZQUNmLE9BQU8sRUFBRSxFQUFFO1lBQ1gsZ0JBQWdCLEVBQUUsSUFBSTtTQUN2QixDQUFDLENBQ0g7YUFDQSxFQUFFLENBQUMsTUFBTSxFQUFFLFVBQVUsR0FBYTtZQUNqQyxJQUFJLENBQUMsSUFBSSxDQUFDLEdBQUcsQ0FBQyxDQUFBO1FBQ2hCLENBQUMsQ0FBQzthQUNELEVBQUUsQ0FBQyxLQUFLLEVBQUU7WUFDVCxPQUFPLENBQUMsSUFBSSxDQUFDLENBQUE7UUFDZixDQUFDLENBQUM7YUFDRCxFQUFFLENBQUMsT0FBTyxFQUFFLFVBQVUsS0FBWTtZQUNqQyxtQkFBTSxDQUFDLEtBQUssQ0FBQyxLQUFLLENBQUMsQ0FBQTtZQUNuQixNQUFNLENBQUMsS0FBSyxDQUFDLENBQUE7UUFDZixDQUFDLENBQUMsQ0FBQTtJQUNOLENBQUMsQ0FBQyxDQUFBO0FBQ0osQ0FBQztBQUVEOzs7Ozs7R0FNRztBQUNILFNBQVMsaUJBQWlCLENBQUMsUUFBZ0I7SUFDekMsT0FBTyxJQUFJLE9BQU8sQ0FBQyxVQUFDLE9BQU8sRUFBRSxNQUFNO1FBQ2pDLElBQUksU0FBUyxHQUFHLEVBQUUsQ0FBQTtRQUVsQiwyQ0FBMkM7UUFDM0MsSUFBTSxFQUFFLEdBQUcsUUFBUSxDQUFDLGVBQWUsQ0FBQztZQUNsQyxLQUFLLEVBQUUsWUFBRSxDQUFDLGdCQUFnQixDQUFDLFFBQVEsQ0FBQztZQUNwQyxTQUFTLEVBQUUsUUFBUTtTQUNwQixDQUFDLENBQUE7UUFFRix5RUFBeUU7UUFDekUsRUFBRSxDQUFDLEVBQUUsQ0FBQyxNQUFNLEVBQUUsVUFBQyxJQUFJO1lBQ2pCLFNBQVMsR0FBRyxJQUFJLENBQUE7WUFFaEIsNERBQTREO1lBQzVELEVBQUUsQ0FBQyxLQUFLLEVBQUUsQ0FBQTtRQUNaLENBQUMsQ0FBQyxDQUFBO1FBRUYsRUFBRSxDQUFDLEVBQUUsQ0FBQyxPQUFPLEVBQUU7WUFDYixtQkFBTSxDQUFDLElBQUksQ0FBQyxrQ0FBMkIsU0FBUyxDQUFFLENBQUMsQ0FBQTtZQUNuRCxPQUFPLENBQUMsU0FBUyxDQUFDLENBQUE7UUFDcEIsQ0FBQyxDQUFDLENBQUE7UUFFRixFQUFFLENBQUMsRUFBRSxDQUFDLE9BQU8sRUFBRSxVQUFVLEtBQVk7WUFDbkMsbUJBQU0sQ0FBQyxLQUFLLENBQUMsS0FBSyxDQUFDLENBQUE7WUFDbkIsTUFBTSxDQUFDLEtBQUssQ0FBQyxDQUFBO1FBQ2YsQ0FBQyxDQUFDLENBQUE7SUFDSixDQUFDLENBQUMsQ0FBQTtBQUNKLENBQUMifQ==