go-healthwatch

Go-HealthWatch is a lightweight Golang package that provides health check functionality for applications and services. It allows you to monitor the health of various components, such as external APIs, databases, caches, and more. With GoHealthWatch, you can easily set up health checks and receive notifications when any issues arise.

Installation

To install GoHealthWatch, use the following command:

go get github.com/pcpratheesh/go-healthwatch

Usage

Creating a Health Check

To create a health check, you can use the NewChecker function and provide the necessary options. You can specify the health checks to be performed and configure a service status notification webhook.

healthchecker := gohealthwatch.NewChecker(
    gohealthwatch.WithIntegrations([]gohealthwatch.HealthCheckConfig{
        {
            Name:       "public-entries",
            URL:        "https://api.publicapis.org/entries",
            Type:       constants.External,
            StatusCode: http.StatusOK,
            Interval:   time.Second * 1,
        },
    }),
)

HealthCheckConfig

This is a configuration struct used to hold the settings for a health check. It contains the following fields:

Field	Description	required
Name	The unique name of the health check	True
URL	The URL to check. This can be anything like an external API URL, database URL, cache URL, etc	True
Type	The type of the health check, which can be one of the constants defined in the constants.Kind enum	True
Interval	The interval duration for the health check in seconds	False
HTTPHeader	An array of HTTP headers to include in the health check request	False
StatusCode	The expected HTTP status code for the health check response	True

Run your own Checks for individual checklist

You can also override the checks to the health check configuration using the AddCheck method. This allows you to override checks based on your specific requirements.

The first argument in the checker.AddCheck() function should be the name of the health check. The second argument is a callback function that takes a HealthCheckConfig object as input and returns an errors.Error object.

checker.AddCheck("public-entries", func(check gohealthwatch.HealthCheckConfig) errors.Error {
    return errors.New("trigger-failure", "")
})

Performing Health Checks

To perform the health checks, simply call the Check method on the HealthCheck instance.

checker.Check()

Service Status Notification WebHook

The WithServiceStatusWebHook function is used to configure a service status notification webhook for the HealthCheck struct. It takes a callback function as an argument, which is invoked when a health check status changes.

gohealthwatch.WithServiceStatusWebHook(func(check gohealthwatch.HealthCheckConfig, statusCode constants.HealthCheckStatus, err errors.Error) {
    switch statusCode {
    case constants.Success:
        logrus.Infof("Custom Handler [%v] health check success\n", check.GetName())
    case constants.Failure:
        logrus.Errorf("Custom Handler  [%v] service check failing due to : %v", check.GetName(), err.Reason())
    }
})

This allows you to customize the behavior when a health check status changes. You can perform actions such as logging, sending notifications, or triggering other processes based on the status and error information.

Example

See more samples at here

Contributing

Contributions to GoHealthWatch are welcome! If you find any issues or have suggestions for improvements, please feel free to open an issue or submit a pull request on the GitHub repository.

License

GoHealthWatch is licensed under the MIT License. See the LICENSE file for more details.