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Package environmentcheck
Short Description Provides an API for building environment tests
License BSD-3-Clause
Informations about the package environmentcheck
Silverstripe Environment Checker Module
This module adds an API for running environment checks to your API.
health/check
- A public URL that performs a quick check that this environment is functioning. This could be tied to a load balancer, for example.dev/check
- An admin-only URL that performs a more comprehensive set of checks. This could be tied to a deployment system, for example.dev/check/<suite>
- Check a specific suite (admin only)
Aren't these just unit tests?
Almost, but not really. Environment checks differ from unit tests in two important ways:
- They test environment specific settings. Unit tests are designed to use dummy data and mock interfaces to external system. Environment checks check the real systems and data that the given environment is actually connected to.
- They can't modify data. Because these checks will run using production databases, they can't go modifying the data in there. This is the biggest reason why we haven't used the same base class as a unit test for writing environment checks - we wanted to make it impossible to accidentally plug a unit test into the environment checker!
Installation
Activating Directly
Register checks in your own _config.php
- see the _config.php
in this module for some defaults. Don't forget to
either use a fully-qualified (namespaced) class name for EnvironmentCheckSuite
, or use
(import) the namespaced class
first.
Activating Via Config
Register your checks on the EnvironmentCheckSuite
. The same named check may be used multiple times.
You can also disable checks configured this way. This is handy if you want to override a check imposed on your project by some other module. Just set the "state" property of the check to "disabled" like this:
Available checks
DatabaseCheck
: Check that the connection to the database is working, by ensuring that the table exists and that the table contain some records.URLCheck
: Check that a given URL is functioning, by default, the homepage.HasFunctionCheck
: Check that the given function exists. This can be used to check that PHP modules or features are installed.HasClassCheck
: Check that the given class exists. This can be used to check that PHP modules or features are installed.FileWriteableCheck
: Check that the given file is writeable.FileAccessibilityAndValidationCheck
: Check that a given file is accessible and optionally matches a given format.FileAgeCheck
: Checks for the maximum age of one or more files or folders. Useful for files which should be frequently auto-generated, like static caches, as well as for backup files and folders.ExternalURLCheck
: Checks that one or more URLs are reachable via HTTP.SMTPConnectCheck
: Checks if the SMTP connection configured through PHP.ini works as expected.SolrIndexCheck
: Checks if the Solr cores of given class are available.SessionCheck
: Checks that a given URL does not generate a session.CacheHeadersCheck
: Check cache headers in response for directives that must either be included or excluded as well checking for existence of ETag.EnvTypeCheck
: Checks environment type, dev and test should not be used on production environments.
Monitoring Checks
Checks will return an appropriate HTTP status code, so are easy to hook into common uptime montoring solutions like pingdom.com.
You can also have the environment checker email results with the following configuration:
Errors can be logged via the standard Silverstripe PSR-3 compatible logging. Each check will cause an individual log
entry. You can choose to enable logging separately for warnings and errors, identified through the
result of EnvironmentCheck->check()
.
Authentication
By default, accessing the dev/check
URL will not require authentication on CLI and dev environments, but if you're
trying to access it on a live or test environment, it will respond with a 403 HTTP status unless you're logged in as
an administrator on the site.
You may wish to have an automated service check dev/check
periodically, but not want to open it up for public access.
You can enable basic authentication by defining the following in your environment (.env
file):
Now if you access dev/check
in a browser it will pop up a basic auth popup, and if the submitted username and password
match the ones defined the username and password defined in the environment, access will be granted to the page.
Adding more checks
To add more checks, you should put additional EnvironmentCheckSuite::register
calls into your _config.php
.
See the _config.php
file of this module for examples.
The first argument is the name of the check suite. There are two built-in check suites, "health", and "check", corresponding to the health/check
and dev/check
URLs. If you wish, you can create your own check suites and execute them on other URLs. You can also add a check to more than one suite by passing the first argument as an array.
To test your own application, you probably want to write custom checks:
- Implement the
SilverStripe\EnvironmentCheck\EnvironmentCheck
interface - Define the
check()
function, which returns a 2 element array:- The first element is one of
EnvironmentCheck::OK
,EnvironmentCheck::WARNING
,EnvironmentCheck::ERROR
, depending on the status of the check - The second element is a string describing the response.
- The first element is one of
Here is a simple example of how you might create a check to test your own code. In this example, we are checking that an instance of the MyGateway
class will return "foo" when call()
is called on it. Testing interfaces with 3rd party systems is a common use case for custom environment checks.
Once you have created your custom check class, don't forget to register it in a check suite
Using other environment check suites
If you want to use the same UI as health/check
and dev/check
, you can create an EnvironmentChecker
object. This class is a RequestHandler
and so can be returned from an action handler. The first argument to the EnvironmentChecker
constructor is the suite name. For example:
If you wish to embed an environment check suite in another, you can use the following call:
$result
will contain a EnvironmentCheckSuiteResult
object
$result->ShouldPass()
: Return a boolean of whether or not the tests passed.$result->Status()
: The string "OK", "WARNING", or "ERROR", depending on the worst failure.$result->Details()
: ADataObjectSet
of details about the result of each check in the suite.
See EnvironmentChecker.ss
to see how these can be used to build a UI.
Versioning
This library follows Semver. According to Semver, you will be able to upgrade to any minor or patch version of this library without any breaking changes to the public API. Semver also requires that we clearly define the public API for this library.
All methods, with public
visibility, are part of the public API. All other methods are not part of the public API. Where possible, we'll try to keep protected
methods backwards-compatible in minor/patch versions, but if you're overriding methods then please test your work before upgrading.
Reporting Issues
Please create an issue for any bugs you've found, or features you're missing.
All versions of environmentcheck with dependencies
silverstripe/framework Version ^5
silverstripe/versioned Version ^2
guzzlehttp/guzzle Version ^7