import { Result, ok, err } from "neverthrow";
/**
* Validate time string is in ISO 8601 format
* @param timeStr Time string in ISO 8601 format
* @returns Result with the time string if valid, or error
*/
export const validateTimeString = (timeStr: string): Result<string, Error> => {
// Basic ISO 8601 validation
if (!timeStr.match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/)) {
return err(new Error(`Invalid time format: ${timeStr}. Expected ISO 8601 format (e.g., 2024-01-01T00:00:00Z)`));
}
// Verify it's a valid date
const date = new Date(timeStr);
if (isNaN(date.getTime())) {
return err(new Error(`Invalid date: ${timeStr}`));
}
return ok(timeStr);
};
/**
* Builds a timestamp filter clause for Google Cloud Logging
* @param startTime Start time in ISO 8601 format
* @param endTime End time in ISO 8601 format
* @returns Filter clause string with both time constraints
*/
export const buildTimestampFilter = (startTime: string, endTime: string): Result<string, Error> => {
const validatedStart = validateTimeString(startTime);
if (validatedStart.isErr()) {
return err(validatedStart.error);
}
const validatedEnd = validateTimeString(endTime);
if (validatedEnd.isErr()) {
return err(validatedEnd.error);
}
// Validate time range
const start = new Date(startTime);
const end = new Date(endTime);
if (start >= end) {
return err(new Error('Start time must be before end time'));
}
return ok(`timestamp>="${validatedStart.value}" AND timestamp<="${validatedEnd.value}"`);
};
/**
* Combines existing filter with timestamp filter
* @param existingFilter Current filter string
* @param timestampFilter Timestamp filter to add
* @returns Combined filter string
*/
export const combineFilters = (existingFilter: string, timestampFilter: string): string => {
if (!timestampFilter) {
return existingFilter;
}
if (!existingFilter) {
return timestampFilter;
}
// If existing filter already has content, wrap it in parentheses and combine
return `(${existingFilter}) AND ${timestampFilter}`;
};
