Introduction to `gorp-logger`

Logging is a critical component of any robust software application. `gorp-logger` is a powerful and flexible logging package for Golang. It is designed to be used with the Gorp ORM, providing a range of useful logging functionalities to help developers monitor their applications effectively. In this article, we will delve into the features of `gorp-logger`, provide useful API explanations, accompanied by relevant code snippets, and share an example application that integrates all these APIs.

APIs and Code Snippets

1. Setting Up the Logger

First and foremost, you need to set up the logger. This initializes the logger with default settings.

  import (
      "github.com/go-gorp/gorp"
      "log"
      "os"
  )

  func setupLogger() *log.Logger {
      logger := log.New(os.Stdout, "gorp: ", log.LstdFlags)
      dbMap := &gorp.DbMap{Db: db, Dialect: gorp.SqliteDialect{}}
      dbMap.TraceOn("[gorp-trace]", logger)
      return logger
  }

2. Logging SQL Statements

Enable SQL statement logging to output executed SQL statements along with their parameters.

  func logSqlStatements(logger *log.Logger, dbMap *gorp.DbMap) {
      dbMap.TraceOn("[gorp-sql]", logger)
  }

3. Detailed Error Logs

Capture detailed error logs to troubleshoot when things go wrong.

  func logErrors(logger *log.Logger, dbMap *gorp.DbMap, err error) {
      if err != nil {
          logger.Printf("An error occurred: %v\n", err)
      }
  }

4. Contextual Logging

Incorporate contextual information into your logs for better traceability.

  func contextualLogging(logger *log.Logger, contextInfo string) {
      logger.Printf("Context: %s - action performed", contextInfo)
  }

5. Log Rotation

Implement log rotation to manage log file sizes effectively.

  import "github.com/natefinch/lumberjack"
  
  func setupLogRotation() *log.Logger {
      logger := &lumberjack.Logger{
          Filename:   "/var/log/gorp_app.log",
          MaxSize:    10, // megabytes
          MaxBackups: 3,
          MaxAge:     28, //days
          Compress:   true, // disabled by default
      }
      
      return log.New(logger, "gorp: ", log.LstdFlags)
  }

Example Application

Let’s put all these APIs together in a sample application.

  import (
      "github.com/go-gorp/gorp"
      "github.com/natefinch/lumberjack"
      "database/sql"
      "log"
      "os"
  )

  var db *sql.DB // Assume db is already initialized

  func main() {
      logger := setupLogger()
      dbMap := &gorp.DbMap{Db: db, Dialect: gorp.SqliteDialect{}}
      
      logger := setupLogRotation()
      dbMap.TraceOn("[gorp-trace]", logger)
      
      err := dbMap.CreateTablesIfNotExists()
      logErrors(logger, dbMap, err)

      logSqlStatements(logger, dbMap)
      contextualLogging(logger, "Starting application")

      // Additional application logic
  }
  
  func setupLogger() *log.Logger {
      logger := log.New(os.Stdout, "gorp: ", log.LstdFlags)
      return logger
  }
  
  func logSqlStatements(logger *log.Logger, dbMap *gorp.DbMap) {
      dbMap.TraceOn("[gorp-sql]", logger)
  }
  
  func logErrors(logger *log.Logger, dbMap *gorp.DbMap, err error) {
      if err != nil {
          logger.Printf("An error occurred: %v\n", err)
      }
  }
  
  func contextualLogging(logger *log.Logger, contextInfo string) {
      logger.Printf("Context: %s - action performed", contextInfo)
  }
  
  func setupLogRotation() *log.Logger {
      logger := &lumberjack.Logger{
          Filename:   "/var/log/gorp_app.log",
          MaxSize:    10, // megabytes
          MaxBackups: 3,
          MaxAge:     28, //days
          Compress:   true, // disabled by default
      }
      
      return log.New(logger, "gorp: ", log.LstdFlags)
  }

By leveraging `gorp-logger` in your Golang applications, you can significantly enhance logging, making it easier to monitor and debug your application.

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