tedious
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A TDS driver, for connecting to MS SQLServer databases.
213 lines (200 loc) • 27.9 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _token = require("./token");
var _colinfoTokenParser = _interopRequireDefault(require("./colinfo-token-parser"));
var _colmetadataTokenParser = require("./colmetadata-token-parser");
var _doneTokenParser = require("./done-token-parser");
var _envChangeTokenParser = _interopRequireDefault(require("./env-change-token-parser"));
var _infoerrorTokenParser = require("./infoerror-token-parser");
var _fedauthInfoParser = _interopRequireDefault(require("./fedauth-info-parser"));
var _featureExtAckParser = _interopRequireDefault(require("./feature-ext-ack-parser"));
var _loginackTokenParser = _interopRequireDefault(require("./loginack-token-parser"));
var _orderTokenParser = _interopRequireDefault(require("./order-token-parser"));
var _returnstatusTokenParser = _interopRequireDefault(require("./returnstatus-token-parser"));
var _returnvalueTokenParser = require("./returnvalue-token-parser");
var _rowTokenParser = require("./row-token-parser");
var _nbcrowTokenParser = require("./nbcrow-token-parser");
var _sspiTokenParser = _interopRequireDefault(require("./sspi-token-parser"));
var _tabnameTokenParser = _interopRequireDefault(require("./tabname-token-parser"));
var _helpers = require("./helpers");
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
/**
* Parses a token that is short enough to simply be parsed again from its
* start if it is not fully available yet.
*/
/**
* Parses a token that can grow arbitrarily large, and thus needs to be parsed
* incrementally.
*
* The reader starts parsing right after the token's type byte and keeps its
* progress across calls: if `read` throws a `NotEnoughDataError`, it is
* called again once more data has arrived.
*/
/**
* A push-based parser for the tokens contained in a TDS token stream.
*
* Data is pushed into the parser as it arrives via `write`, and parsed tokens
* are pulled out via `read`. Tokens are parsed lazily, one at a time, so any
* effects of handling a token (e.g. the TDS version negotiated via the
* `LOGINACK` token) apply to the parsing of all tokens that follow it.
*/
class Parser {
// The data that is currently being parsed, and the position of the first
// byte in it that has not been consumed yet.
// Chunks that were written, but not yet appended to `buffer`.
// The number of unconsumed bytes required for parsing to make progress.
//
// Incomplete data is not appended to `buffer` until at least this many
// bytes are available, so that a large token arriving across many chunks is
// not parsed again (and copied again) for every chunk.
// The reader of an incrementally parsed token that is not complete yet.
constructor(options, colMetadata = []) {
this.options = options;
this.colMetadata = colMetadata;
this.buffer = Buffer.alloc(0);
this.position = 0;
this.pending = [];
this.pendingLength = 0;
this.bytesNeeded = 1;
this.tokenReader = undefined;
}
/**
* Parse all tokens from the given chunks of data.
*/
static async *parseTokens(iterable, options, colMetadata) {
const parser = new Parser(options, colMetadata);
for await (const chunk of iterable) {
parser.write(chunk);
let token;
while ((token = parser.read()) !== undefined) {
yield token;
}
}
parser.end();
}
/**
* Add a chunk of data to be parsed.
*/
write(chunk) {
this.pending.push(chunk);
this.pendingLength += chunk.length;
}
/**
* Parse the next token, or return `undefined` if more data needs to be
* written first.
*/
read() {
while (true) {
if (this.buffer.length - this.position < this.bytesNeeded && !this.appendPending()) {
return undefined;
}
let token;
try {
token = this.tokenReader !== undefined ? this.tokenReader.read(this) : this.readToken();
} catch (err) {
if (err instanceof _helpers.NotEnoughDataError) {
// Always wait for at least one more byte, so parsing never retries
// without new data.
this.bytesNeeded = Math.max(err.byteCount, this.buffer.length + 1) - this.position;
continue;
}
throw err;
}
this.tokenReader = undefined;
this.bytesNeeded = 1;
// Some tokens (e.g. unknown `ENVCHANGE` types) are skipped.
if (token !== undefined) {
return token;
}
}
}
/**
* Signal that all data was written.
*
* Throws if the data ended in the middle of a token.
*/
end() {
if (this.tokenReader !== undefined || this.position < this.buffer.length || this.pendingLength > 0) {
throw new Error('unexpected end of data');
}
}
/**
* Append the pending chunks to the unconsumed data, if that makes enough
* data available for parsing to make progress.
*/
appendPending() {
const remaining = this.buffer.length - this.position;
if (remaining + this.pendingLength < this.bytesNeeded) {
return false;
}
if (remaining === 0 && this.pending.length === 1) {
this.buffer = this.pending[0];
} else {
this.pending.unshift(this.buffer.subarray(this.position));
this.buffer = Buffer.concat(this.pending, remaining + this.pendingLength);
}
this.position = 0;
this.pending = [];
this.pendingLength = 0;
return true;
}
readToken() {
const type = this.buffer[this.position];
switch (type) {
case _token.TYPE.DONE:
return this.parseToken(_doneTokenParser.doneParser);
case _token.TYPE.DONEPROC:
return this.parseToken(_doneTokenParser.doneProcParser);
case _token.TYPE.DONEINPROC:
return this.parseToken(_doneTokenParser.doneInProcParser);
case _token.TYPE.ERROR:
return this.parseToken(_infoerrorTokenParser.errorParser);
case _token.TYPE.INFO:
return this.parseToken(_infoerrorTokenParser.infoParser);
case _token.TYPE.ENVCHANGE:
return this.parseToken(_envChangeTokenParser.default);
case _token.TYPE.LOGINACK:
return this.parseToken(_loginackTokenParser.default);
case _token.TYPE.RETURNSTATUS:
return this.parseToken(_returnstatusTokenParser.default);
case _token.TYPE.ORDER:
return this.parseToken(_orderTokenParser.default);
case _token.TYPE.FEDAUTHINFO:
return this.parseToken(_fedauthInfoParser.default);
case _token.TYPE.SSPI:
return this.parseToken(_sspiTokenParser.default);
case _token.TYPE.FEATUREEXTACK:
return this.parseToken(_featureExtAckParser.default);
case _token.TYPE.TABNAME:
return this.parseToken(_tabnameTokenParser.default);
case _token.TYPE.COLINFO:
return this.parseToken(_colinfoTokenParser.default);
case _token.TYPE.COLMETADATA:
return this.startTokenReader(new _colmetadataTokenParser.ColMetadataTokenReader());
case _token.TYPE.RETURNVALUE:
return this.startTokenReader(new _returnvalueTokenParser.ReturnValueTokenReader());
case _token.TYPE.ROW:
return this.startTokenReader(new _rowTokenParser.RowTokenReader());
case _token.TYPE.NBCROW:
return this.startTokenReader(new _nbcrowTokenParser.NBCRowTokenReader());
default:
throw new Error('Unknown type: ' + type);
}
}
parseToken(parser) {
const result = parser(this.buffer, this.position + 1, this.options);
this.position = result.offset;
return result.value;
}
startTokenReader(reader) {
this.position += 1;
this.tokenReader = reader;
return reader.read(this);
}
}
var _default = exports.default = Parser;
module.exports = Parser;
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["_token","require","_colinfoTokenParser","_interopRequireDefault","_colmetadataTokenParser","_doneTokenParser","_envChangeTokenParser","_infoerrorTokenParser","_fedauthInfoParser","_featureExtAckParser","_loginackTokenParser","_orderTokenParser","_returnstatusTokenParser","_returnvalueTokenParser","_rowTokenParser","_nbcrowTokenParser","_sspiTokenParser","_tabnameTokenParser","_helpers","e","__esModule","default","Parser","constructor","options","colMetadata","buffer","Buffer","alloc","position","pending","pendingLength","bytesNeeded","tokenReader","undefined","parseTokens","iterable","parser","chunk","write","token","read","end","push","length","appendPending","readToken","err","NotEnoughDataError","Math","max","byteCount","Error","remaining","unshift","subarray","concat","type","TYPE","DONE","parseToken","doneParser","DONEPROC","doneProcParser","DONEINPROC","doneInProcParser","ERROR","errorParser","INFO","infoParser","ENVCHANGE","envChangeParser","LOGINACK","loginAckParser","RETURNSTATUS","returnStatusParser","ORDER","orderParser","FEDAUTHINFO","fedAuthInfoParser","SSPI","sspiParser","FEATUREEXTACK","featureExtAckParser","TABNAME","tabNameParser","COLINFO","colInfoParser","COLMETADATA","startTokenReader","ColMetadataTokenReader","RETURNVALUE","ReturnValueTokenReader","ROW","RowTokenReader","NBCROW","NBCRowTokenReader","result","offset","value","reader","_default","exports","module"],"sources":["../../src/token/stream-parser.ts"],"sourcesContent":["import { type InternalConnectionOptions } from '../connection';\n\nimport { TYPE, type Token } from './token';\n\nimport colInfoParser from './colinfo-token-parser';\nimport { ColMetadataTokenReader, type ColumnMetadata } from './colmetadata-token-parser';\nimport { doneParser, doneInProcParser, doneProcParser } from './done-token-parser';\nimport envChangeParser from './env-change-token-parser';\nimport { errorParser, infoParser } from './infoerror-token-parser';\nimport fedAuthInfoParser from './fedauth-info-parser';\nimport featureExtAckParser from './feature-ext-ack-parser';\nimport loginAckParser from './loginack-token-parser';\nimport orderParser from './order-token-parser';\nimport returnStatusParser from './returnstatus-token-parser';\nimport { ReturnValueTokenReader } from './returnvalue-token-parser';\nimport { RowTokenReader } from './row-token-parser';\nimport { NBCRowTokenReader } from './nbcrow-token-parser';\nimport sspiParser from './sspi-token-parser';\nimport tabNameParser from './tabname-token-parser';\nimport { NotEnoughDataError, type Result } from './helpers';\n\nexport type ParserOptions = Pick<InternalConnectionOptions, 'useUTC' | 'lowerCaseGuids' | 'tdsVersion' | 'useColumnNames' | 'columnNameReplacer' | 'camelCaseColumns'>;\n\n/**\n * Parses a token that is short enough to simply be parsed again from its\n * start if it is not fully available yet.\n */\ntype TokenParser = (buf: Buffer, offset: number, options: ParserOptions) => Result<Token | undefined>;\n\n/**\n * Parses a token that can grow arbitrarily large, and thus needs to be parsed\n * incrementally.\n *\n * The reader starts parsing right after the token's type byte and keeps its\n * progress across calls: if `read` throws a `NotEnoughDataError`, it is\n * called again once more data has arrived.\n */\nexport interface TokenReader {\n  read(parser: Parser): Token;\n}\n\n/**\n * A push-based parser for the tokens contained in a TDS token stream.\n *\n * Data is pushed into the parser as it arrives via `write`, and parsed tokens\n * are pulled out via `read`. Tokens are parsed lazily, one at a time, so any\n * effects of handling a token (e.g. the TDS version negotiated via the\n * `LOGINACK` token) apply to the parsing of all tokens that follow it.\n */\nclass Parser {\n  declare options: ParserOptions;\n  declare colMetadata: ColumnMetadata[];\n\n  // The data that is currently being parsed, and the position of the first\n  // byte in it that has not been consumed yet.\n  declare buffer: Buffer;\n  declare position: number;\n\n  // Chunks that were written, but not yet appended to `buffer`.\n  declare pending: Buffer[];\n  declare pendingLength: number;\n\n  // The number of unconsumed bytes required for parsing to make progress.\n  //\n  // Incomplete data is not appended to `buffer` until at least this many\n  // bytes are available, so that a large token arriving across many chunks is\n  // not parsed again (and copied again) for every chunk.\n  declare bytesNeeded: number;\n\n  // The reader of an incrementally parsed token that is not complete yet.\n  declare tokenReader: TokenReader | undefined;\n\n  constructor(options: ParserOptions, colMetadata: ColumnMetadata[] = []) {\n    this.options = options;\n    this.colMetadata = colMetadata;\n\n    this.buffer = Buffer.alloc(0);\n    this.position = 0;\n\n    this.pending = [];\n    this.pendingLength = 0;\n\n    this.bytesNeeded = 1;\n    this.tokenReader = undefined;\n  }\n\n  /**\n   * Parse all tokens from the given chunks of data.\n   */\n  static async *parseTokens(iterable: AsyncIterable<Buffer> | Iterable<Buffer>, options: ParserOptions, colMetadata?: ColumnMetadata[]): AsyncGenerator<Token, void, undefined> {\n    const parser = new Parser(options, colMetadata);\n\n    for await (const chunk of iterable) {\n      parser.write(chunk);\n\n      let token;\n      while ((token = parser.read()) !== undefined) {\n        yield token;\n      }\n    }\n\n    parser.end();\n  }\n\n  /**\n   * Add a chunk of data to be parsed.\n   */\n  write(chunk: Buffer) {\n    this.pending.push(chunk);\n    this.pendingLength += chunk.length;\n  }\n\n  /**\n   * Parse the next token, or return `undefined` if more data needs to be\n   * written first.\n   */\n  read(): Token | undefined {\n    while (true) {\n      if (this.buffer.length - this.position < this.bytesNeeded && !this.appendPending()) {\n        return undefined;\n      }\n\n      let token;\n      try {\n        token = this.tokenReader !== undefined ? this.tokenReader.read(this) : this.readToken();\n      } catch (err) {\n        if (err instanceof NotEnoughDataError) {\n          // Always wait for at least one more byte, so parsing never retries\n          // without new data.\n          this.bytesNeeded = Math.max(err.byteCount, this.buffer.length + 1) - this.position;\n          continue;\n        }\n\n        throw err;\n      }\n\n      this.tokenReader = undefined;\n      this.bytesNeeded = 1;\n\n      // Some tokens (e.g. unknown `ENVCHANGE` types) are skipped.\n      if (token !== undefined) {\n        return token;\n      }\n    }\n  }\n\n  /**\n   * Signal that all data was written.\n   *\n   * Throws if the data ended in the middle of a token.\n   */\n  end() {\n    if (this.tokenReader !== undefined || this.position < this.buffer.length || this.pendingLength > 0) {\n      throw new Error('unexpected end of data');\n    }\n  }\n\n  /**\n   * Append the pending chunks to the unconsumed data, if that makes enough\n   * data available for parsing to make progress.\n   */\n  appendPending(): boolean {\n    const remaining = this.buffer.length - this.position;\n    if (remaining + this.pendingLength < this.bytesNeeded) {\n      return false;\n    }\n\n    if (remaining === 0 && this.pending.length === 1) {\n      this.buffer = this.pending[0];\n    } else {\n      this.pending.unshift(this.buffer.subarray(this.position));\n      this.buffer = Buffer.concat(this.pending, remaining + this.pendingLength);\n    }\n\n    this.position = 0;\n    this.pending = [];\n    this.pendingLength = 0;\n\n    return true;\n  }\n\n  readToken(): Token | undefined {\n    const type = this.buffer[this.position];\n\n    switch (type) {\n      case TYPE.DONE:\n        return this.parseToken(doneParser);\n\n      case TYPE.DONEPROC:\n        return this.parseToken(doneProcParser);\n\n      case TYPE.DONEINPROC:\n        return this.parseToken(doneInProcParser);\n\n      case TYPE.ERROR:\n        return this.parseToken(errorParser);\n\n      case TYPE.INFO:\n        return this.parseToken(infoParser);\n\n      case TYPE.ENVCHANGE:\n        return this.parseToken(envChangeParser);\n\n      case TYPE.LOGINACK:\n        return this.parseToken(loginAckParser);\n\n      case TYPE.RETURNSTATUS:\n        return this.parseToken(returnStatusParser);\n\n      case TYPE.ORDER:\n        return this.parseToken(orderParser);\n\n      case TYPE.FEDAUTHINFO:\n        return this.parseToken(fedAuthInfoParser);\n\n      case TYPE.SSPI:\n        return this.parseToken(sspiParser);\n\n      case TYPE.FEATUREEXTACK:\n        return this.parseToken(featureExtAckParser);\n\n      case TYPE.TABNAME:\n        return this.parseToken(tabNameParser);\n\n      case TYPE.COLINFO:\n        return this.parseToken(colInfoParser);\n\n      case TYPE.COLMETADATA:\n        return this.startTokenReader(new ColMetadataTokenReader());\n\n      case TYPE.RETURNVALUE:\n        return this.startTokenReader(new ReturnValueTokenReader());\n\n      case TYPE.ROW:\n        return this.startTokenReader(new RowTokenReader());\n\n      case TYPE.NBCROW:\n        return this.startTokenReader(new NBCRowTokenReader());\n\n      default:\n        throw new Error('Unknown type: ' + type);\n    }\n  }\n\n  parseToken(parser: TokenParser): Token | undefined {\n    const result = parser(this.buffer, this.position + 1, this.options);\n    this.position = result.offset;\n    return result.value;\n  }\n\n  startTokenReader(reader: TokenReader): Token {\n    this.position += 1;\n    this.tokenReader = reader;\n    return reader.read(this);\n  }\n}\n\nexport default Parser;\nmodule.exports = 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