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'use strict';
const { format } = require('internal/util/inspect');
// `debugs` is deliberately initialized to undefined so any call to
// debuglog() before initializeDebugEnv() is called will throw.
let debugs;
let debugEnvRegex = /^$/;
// `debugEnv` is initial value of process.env.NODE_DEBUG
function initializeDebugEnv(debugEnv) {
debugs = {};
if (debugEnv) {
debugEnv = debugEnv.replace(/[|\\{}()[\]^$+?.]/g, '\\$&')
.replace(/\*/g, '.*')
.replace(/,/g, '$|^')
.toUpperCase();
debugEnvRegex = new RegExp(`^${debugEnv}$`, 'i');
}
}
// 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 \'' + set.toLowerCase() + '\' can expose sensitive ' +
'data (such as passwords, tokens and authentication headers) ' +
'in the resulting log.');
}
}
function debuglogImpl(set) {
set = set.toUpperCase();
if (debugs[set] === undefined) {
if (debugEnvRegex.test(set)) {
const pid = process.pid;
emitWarningIfNeeded(set);
debugs[set] = function debug(...args) {
const msg = format(...args);
process.stderr.write(format('%s %d: %s\n', set, pid, msg));
};
} else {
debugs[set] = null;
}
}
return debugs[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) {
let debug;
return function(...args) {
if (debug === undefined) {
// Only invokes debuglogImpl() when the debug function is
// called for the first time.
debug = debuglogImpl(set);
}
if (debug !== null)
debug(...args);
};
}
module.exports = {
debuglog,
initializeDebugEnv
};
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