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const {
ObjectCreate,
ObjectDefineProperty,
RegExp,
RegExpPrototypeExec,
SafeArrayIterator,
StringPrototypeToLowerCase,
StringPrototypeToUpperCase,
} = primordials;
const { inspect, format, formatWithOptions } = require('internal/util/inspect');
// `debugImpls` and `testEnabled` are deliberately not initialized so any call
// to `debuglog()` before `initializeDebugEnv()` is called will throw.
let debugImpls;
let testEnabled;
// `debugEnv` is initial value of process.env.NODE_DEBUG
function initializeDebugEnv(debugEnv) {
debugImpls = ObjectCreate(null);
if (debugEnv) {
// This is run before any user code, it's OK not to use primordials.
debugEnv = debugEnv.replace(/[|\\{}()[\]^$+?.]/g, '\\$&')
.replaceAll('*', '.*')
.replaceAll(',', '$|^');
const debugEnvRegex = new RegExp(`^${debugEnv}$`, 'i');
testEnabled = (str) => RegExpPrototypeExec(debugEnvRegex, str) !== null;
} else {
testEnabled = () => false;
}
}
// Emits warning when user sets
// NODE_DEBUG=http or NODE_DEBUG=http2.
function emitWarningIfNeeded(set) {
if ('HTTP' === set || 'HTTP2' === set) {
process.emitWarning('Setting the NODE_DEBUG environment variable ' +
'to \'' + StringPrototypeToLowerCase(set) + '\' can expose sensitive ' +
'data (such as passwords, tokens and authentication headers) ' +
'in the resulting log.');
}
}
const noop = () => {};
function debuglogImpl(enabled, set) {
if (debugImpls[set] === undefined) {
if (enabled) {
const pid = process.pid;
emitWarningIfNeeded(set);
debugImpls[set] = function debug(...args) {
const colors = process.stderr.hasColors && process.stderr.hasColors();
const msg = formatWithOptions({ colors }, ...args);
const coloredPID = inspect(pid, { colors });
process.stderr.write(format('%s %s: %s\n', set, coloredPID, msg));
};
} else {
debugImpls[set] = noop;
}
}
return debugImpls[set];
}
// debuglogImpl depends on process.pid and process.env.NODE_DEBUG,
// so it needs to be called lazily in top scopes of internal modules
// that may be loaded before these run time states are allowed to
// be accessed.
function debuglog(set, cb) {
function init() {
set = StringPrototypeToUpperCase(set);
enabled = testEnabled(set);
}
let debug = (...args) => {
init();
// Only invokes debuglogImpl() when the debug function is
// called for the first time.
debug = debuglogImpl(enabled, set);
if (typeof cb === 'function')
cb(debug);
switch (args.length) {
case 1: return debug(args[0]);
case 2: return debug(args[0], args[1]);
default: return debug(...new SafeArrayIterator(args));
}
};
let enabled;
let test = () => {
init();
test = () => enabled;
return enabled;
};
const logger = (...args) => {
switch (args.length) {
case 1: return debug(args[0]);
case 2: return debug(args[0], args[1]);
default: return debug(...new SafeArrayIterator(args));
}
};
ObjectDefineProperty(logger, 'enabled', {
get() {
return test();
},
configurable: true,
enumerable: true
});
return logger;
}
module.exports = {
debuglog,
initializeDebugEnv
};
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