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// Yields every logline that contains the specified fields. The regex escape function used here is
// drawn from the following:
// https://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
// https://github.com/ljharb/regexp.escape
function* findMatchingLogLines(logLines, fields, ignoreFields) {
ignoreFields = ignoreFields || [];
function escapeRegex(input) {
return (typeof input === "string" ? input.replace(/[\^\$\\\.\*\+\?\(\)\[\]\{\}]/g, '\\$&')
: input);
}
function lineMatches(line, fields, ignoreFields) {
const fieldNames =
Object.keys(fields).filter((fieldName) => !ignoreFields.includes(fieldName));
return fieldNames.every((fieldName) => {
const fieldValue = fields[fieldName];
let regex;
const booleanFields = [
'cursorExhausted',
'upsert',
'hasSortStage',
'usedDisk',
'cursorExhausted',
'cursorExhausted'
];
// Command is a special case since it is the first arg of the message, not a
// separate field
if (fieldName === "command") {
let commandName = fieldValue;
// These commands can be sent camelCase or lower case but shell sends them lower
// case
if (fieldValue === "findAndModify" || fieldValue === "mapReduce") {
commandName = fieldValue.toLowerCase();
}
regex = `"command":{"${commandName}`;
} else if (fieldName === "insert" && fieldValue.indexOf("|") != -1) {
// Match new and legacy insert
regex = `("insert","ns":"(${fieldValue})"|("insert":"(${fieldValue})"))`;
} else if (booleanFields.find(f => f === fieldName) && fieldValue == 1) {
regex = `"${fieldName}":true`;
} else {
regex = "\"" + escapeRegex(fieldName) + "\":(" +
escapeRegex(checkLog.formatAsJsonLogLine(fieldValue)) + "|" +
escapeRegex(checkLog.formatAsJsonLogLine(fieldValue, true)) + ")";
}
const match = line.match(regex);
return match && match[0];
});
}
for (const line of logLines) {
if (lineMatches(line, fields, ignoreFields)) {
yield line;
}
}
}
// Finds and returns a logline containing all the specified fields, or null if no such logline
// was found.
function findMatchingLogLine(logLines, fields, ignoreFields) {
for (const line of findMatchingLogLines(logLines, fields, ignoreFields)) {
return line;
}
return null;
}
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