Error Formatting Messages
Support Partners Console Error ReportingProduct OverviewDocumentationQuickstartHow-to GuidesAll How-to GuidesSetupGoogle App EngineStandard EnvironmentFlexible EnvironmentGoogle Compute EngineAmazon EC2Formatting Error MessagesViewing ErrorsError DetailsNotificationsDeleting ErrorsAPIs & ReferenceOverviewREST APIOverviewCollectionsprojectsOverviewdeleteEventsprojects.eventsOverviewlistreportprojects.groupStatsOverviewlistprojects.groupsOverviewgetupdateOther TypesErrorContextErrorEventQueryTimeRangeServiceContextServiceContextFilterResourcesHow Errors are GroupedTroubleshooting Error ReportingProduct OverviewDocumentationQuickstartHow-to GuidesAll How-to GuidesSetupGoogle App EngineStandard EnvironmentFlexible EnvironmentGoogle Compute EngineAmazon EC2Formatting Error MessagesViewing ErrorsError DetailsNotificationsDeleting ErrorsAPIs & ReferenceOverviewREST APIOverviewCollectionsprojectsOverviewdeleteEventsprojects.eventsOverviewlistreportprojects.groupStatsOverviewlistprojects.groupsOverviewgetupdateOther TypesErrorContextErrorEventQueryTimeRangeServiceContextServiceContextFilterResourcesHow Errors are GroupedTroubleshooting Stackdriver Error Reporting Documentation Documentation Formatting Error Messages When logging error data from App Engine, Container Engine or Compute Engine, the only requirement is for the log entry to contain the full error message and stack trace. It should be logged as a multi-line textPayload or in the message field of structPayload. When sending error data via the report API or when using custom logs, the following JSON structure must be used. JSON representation { "eventTime": string, "serviceContext": { "service": string, // Required. "version": string }, "message": string, // Required. Should contain the full exception // message, including the stack trace. "context": { "httpRequest": { "method": string, "url": string, "userAgent": string, "referrer": string, "responseStatusCode": number, "remoteIp": string }, "user": string, "reportLocation": { // Required if no stack trace in 'message'. "filePath": string, "lineNumber": number, "functionName": string } } } Fields Field name Type Description Notes eventTime string Time when the event occurred as provided in the error report. If the report did not contain a timestamp, the time the error was received by the Error Reporting system is used.A timestamp in RFC3339 UTC "Zulu" format, accurate to nanoseconds.
like this: program:source-file-name:lineno: message when there is an appropriate source file, or like this: program: message when there is no relevant source file. In an interactive program (one that is reading commands https://cloud.google.com/error-reporting/docs/formatting-error-messages from a terminal), it is better not to include the program name in an error message. The place to indicate which program is running is in the prompt or with the screen http://www.math.utah.edu/docs/info/standards_14.html layout. (When the same program runs with input from a source other than a terminal, it is not interactive and would do best to print error messages using the noninteractive style.) The string message should not begin with a capital letter when it follows a program name and/or filename. Also, it should not end with a period. Error messages from interactive programs, and other messages such as usage messages, should start with a capital letter. But they should not end with a period. Go to the first, previous, next, last section, table of contents.
2015 Over the last couple years, I’ve started putting my Exception messages inside static methods on custom exception classes. This is http://rosstuck.com/formatting-exception-messages hardly a new trick, Doctrine’s been doing it for the better part of a decade. Still, many folks are surprised by it, so this article explains the how http://stackoverflow.com/questions/33791417/custom-error-formatting and why. How does it work? Let’s say you’re writing a large CSV import and you stumble across an invalid row, perhaps it’s missing a column. Your code error formatting might look like this: if (!$row->hasColumns($expectedColumns)) { throw new Exception("Row is missing one or more columns"); } This works in terms of stopping the program but it’s not very flexible for the developer. We can improve this is creating a custom exception class. class InvalidRowException extends \Exception { } Now we throw our custom Exception instead: if error formatting messages (!$row->hasColumns($expectedColumns)) { throw new InvalidRowException("Row is missing one or more columns"); } This might look like boilerplate but it allows higher level code to recognize which error was raised and handle it accordingly. For example, we might stop the entire program on a NoDatabaseConnectionException but only log an InvalidRowException before continuing. Still, the error message isn’t very helpful from a debugging perspective. Which row failed? It would be better if we always included the row number in our error message. if (!$row->hasColumns($expectedColumns)) { throw new InvalidRowException( "Row #" . $row->getIndex() . " is missing one or more columns" ); } That’s better in the log but now the formatting on this one little message is getting a bit noisy and distracting. There’s no upper bound on this complexity: as the log message gets complex, the code will get uglier. Not to mention, there are multiple reasons we might throw an InvalidRowException but we’d need to format them all to include the row number. Booorrrriiing. Moving the Form
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Custom error formatting up vote 8 down vote favorite 4 I have implemented my own custom error: function MyError() { var temp = Error.apply(this, arguments); temp.name = this.name = 'MyError'; this.stack = temp.stack; this.message = temp.message; } MyError.prototype = Object.create(Error.prototype, { constructor: { value: MyError, writable: true, configurable: true } }); And what I'm missing is to make it display itself on screen as it would when a regular unhanded error occurs, i.e. if we do throw new Error('Hello!'), we get output: throw new Error('Hello!'); ^ Error: Hello! at Object.