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# Backend # Backend
First read the [backend style guide](/contribute/backend/style-guide.md) The contribution guidelines for Grafana backend developers contain a lot of information for anyone who wants to contribute to our open source project.
to get a sense for how we work to ensure that the Grafana codebase is But you don't necessarily have to read all of it, so long as you read what is most relevant to you.
consistent and accessible. The rest of the backend contributor
documentation is more relevant to reviewers and contributors looking to
make larger changes.
For anyone reviewing code for Grafana's backend, a basic understanding ## Guidelines everyone should read
of content of the following files is expected:
We recommend that all contributors read the [backend style guide](/contribute/backend/style-guide.md) to get a sense for how we try to ensure that the Grafana codebase is consistent and accessible.
The rest of the backend contributor documentation tends to be more relevant to reviewers and contributors who want to make changes of greater size or quantity.
## Guidelines specifically for backend developers
For anyone who reviews code for the Grafana backend, get a basic understanding of the content of the following files:
- [Currently recommended practices](/contribute/backend/recommended-practices.md) - [Currently recommended practices](/contribute/backend/recommended-practices.md)
- [Services](/contribute/backend/services.md) - [Services](/contribute/backend/services.md)
@@ -15,13 +18,11 @@ of content of the following files is expected:
- [Database](/contribute/backend/database.md) - [Database](/contribute/backend/database.md)
- [HTTP API](/pkg/api/README.md) - [HTTP API](/pkg/api/README.md)
Reviewers who review large changes should additionally make a habit out ## Guidelines for contributors who make or review large changes to the backend
of familiarizing themselves with the content of
If you want to make or review large changes to the backend, be sure to habitually familiarize yourself with the entire contents of
[/contribute/backend](/contribute/backend) from time to time. [/contribute/backend](/contribute/backend) from time to time.
## Dependency management ## Guidelines for dependency management
Refer to: If you work with a dependency that requires an upgrade, refer to [Upgrading dependencies](/contribute/backend/upgrading-dependencies.md).
- [UPGRADING_DEPENDENCIES.md](https://github.com/grafana/grafana/blob/main/UPGRADING_DEPENDENCIES.md)
- [Upgrading dependencies](/contribute/backend/upgrading-dependencies.md)

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# Currently recommended practices # Currently recommended practices
We occasionally identify patterns that are either useful or harmful that Grafana Labs occasionally identifies patterns that may be useful or harmful so that we can introduce or remove from the codebase.
we'll want to introduce or remove from the codebase. When the complexity When the complexity or importance of introducing or removing such idiomatic patterns is sufficiently high, we document it on this page to provide a reference. Because the relevance of these practices may vary over time, we call them _currently recommended practices_.
or importance of introducing or removing such a pattern is sufficiently
high, we'll document it here to provide an addressable local ## Large-scale refactoring
'currently recommended practice'. By collecting these practices in a
single place, we're able to reference them and make it easier to have a
shared understanding of how to write idiomatic code for the Grafana
backend.
Large-scale refactoring based on a new recommended practice is a Large-scale refactoring based on a new recommended practice is a
delicate matter, and most of the time it's better to introduce the new delicate matter. It's usually better to introduce the new
way incrementally over multiple releases and over time to balance the way incrementally over multiple releases and over time to balance the
want to introduce new useful patterns and the need to keep Grafana desire to introduce new useful patterns with the need to keep Grafana
stable. It's also easier to review and revert smaller chunks of changes, stable. It's also easier to review and revert smaller chunks of changes,
reducing the risk of complications. reducing the risk of complications.
| State | Description | ## States of refactoring
| ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| Proposed | The practice has been proposed and been positively received by the Grafana team. Following the proposal is a discretionary choice for developers. | Refer to the following table to identify important categories of refactoring.
| Ongoing, active | The practice is actively being worked on. New code should adhere to the practice where at all possible. |
| Ongoing, passive | There is no immediate active work on refactoring old code. New code should adhere to the practice where at all possible. | | State | Description |
| Completed | The work has been done and there is no, or negligible, legacy code left that need refactoring. New code must adhere to the practice. | | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
| Abandoned | The practice has no longer any active ongoing work and new code don't need to comply with the practice described. | | Proposed | This is an optional practice that has been proposed and received positively by the Grafana team. Follow this proposal as you choose. |
| Ongoing, active | The practice is actively being worked on. New code should adhere to the practice whenever possible. |
| Ongoing, passive | There's no immediate active work on refactoring old code. New code should adhere to the practice whenever possible. |
| Completed | The work has been done and there is no, or negligible, legacy code left that needs refactoring. New code must adhere to the practice. |
| Abandoned | The practice doesn't have any active ongoing work and new code doesn't need to comply with the practice described. |
## 1 - Idiomatic Grafana code should be idiomatic Go code ## 1 - Idiomatic Grafana code should be idiomatic Go code
**Status:** Ongoing, passive. **Status:** Ongoing, passive.
It'll be easier for contributors to start contributing to Grafana if our It's easier for contributors to start contributing to Grafana if our
code is easily understandable. When there isn't a more specific Grafana code is easily understandable. When there isn't a more specific Grafana
recommended practice, we recommend following the practices as put forth recommended practice, we recommend that you follow the practices as put forth
by the Go project for development of Go code or the Go compiler itself by the Go project for development of Go code or the Go compiler itself
when applicable. as appropriate.
The first resource we recommend everyone developing Grafana's backend to Firstly, best practice is the online book [_Effective Go_](https://golang.org/doc/effective_go.html), which isn't updated to reflect more recent changes since Go was initially released, but which remains a good source for understanding the general differences between Go and other languages.
skim is "[Effective Go](https://golang.org/doc/effective_go.html)",
which isn't updated to reflect more recent changes since Go was
initially released but remain a good source for understanding the
general differences between Go and other languages.
Secondly, the guidelines for [Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments) Secondly, the guidelines for [Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments) for the Go compiler can mostly be applied directly to the Grafana codebase.
for the Go compiler can mostly be applied directly to the Grafana There are idiosyncrasies in Grafana, such as interfaces living closer to their declarations than to their users for services, and the documentation doesn't enforce public declarations.
codebase. There are idiosyncrasies in Grafana such as interfaces living Instead, the documentation prioritizes high coverage aimed at end-users over documenting internals in the backend.
closer to its declaration than to its users for services and don't
enforce documentation of public declarations (prioritize high coverage
of documentation aimed at end-users over documenting internals in the
backend).
- [Effective Go](https://golang.org/doc/effective_go.html) - [_Effective Go_](https://golang.org/doc/effective_go.html).
- [Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments) - [Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments).
## 100 - Global state ## 100 - Global state
**State:** Ongoing, passive. **State:** Ongoing, passive.
Global state makes testing and debugging software harder, and it's something we want to avoid when possible. Unfortunately, there is quite a lot of global state in Grafana. Global state makes testing and debugging software harder, and it's something we want to avoid whenever possible.
We want to migrate away from this by using Unfortunately, there's quite a lot of global state in Grafana.
[Wire](https://github.com/google/wire) and dependency injection to pack We want to migrate away from this state by using
[Wire](https://github.com/google/wire) and dependency injection to pack code.
## 101 - Limit the use of the init() function ## 101 - Limit use of the init() function
**State:** Ongoing, passive. **State:** Ongoing, passive.
Only use the init() function to register services/implementations. Don't use the `init()` function for any purpose other than registering services or implementations.
## 102 - Settings refactoring ## 102 - Refactor settings
**State:** Ongoing, passive. **State:** Ongoing, passive.
The plan is to move all settings to from package level vars in settings package to the [setting.Cfg](https://github.com/grafana/grafana/blob/df917663e6f358a076ed3daa9b199412e95c11f4/pkg/setting/setting.go#L210) struct. To access the settings, services and components can inject this setting.Cfg struct: We plan to move all settings from package-level vars in the settings package to the [`setting.Cfg`](https://github.com/grafana/grafana/blob/df917663e6f358a076ed3daa9b199412e95c11f4/pkg/setting/setting.go#L210) struct. To access the settings, services and components can inject `setting.Cfg`:
- [Cfg struct](https://github.com/grafana/grafana/blob/df917663e6f358a076ed3daa9b199412e95c11f4/pkg/setting/setting.go#L210) - [`Cfg` struct](https://github.com/grafana/grafana/blob/df917663e6f358a076ed3daa9b199412e95c11f4/pkg/setting/setting.go#L210)
- [Injection example](https://github.com/grafana/grafana/blob/c9773e55b234b7637ea97b671161cd856a1d3d69/pkg/services/cleanup/cleanup.go#L34) - [Injection](https://github.com/grafana/grafana/blob/c9773e55b234b7637ea97b671161cd856a1d3d69/pkg/services/cleanup/cleanup.go#L34)
## 103 - Reduce the use of GoConvey ## 103 - Reduce use of GoConvey
**State:** Completed. **State:** Completed.
We want to migrate away from using GoConvey. Instead, we want to use We encourage you to migrate away from using GoConvey.
stdlib testing with [testify](https://github.com/stretchr/testify), Instead, we suggest the use of `stdlib` testing with [testify](https://github.com/stretchr/testify), because it's the most common approach in the Go community, and we think it will be easier for new contributors.
because it's the most common approach in the Go community, and we think To learn more about how we want to write tests, refer to the [backend style guide](/contribute/backend/style-guide.md).
it will be easier for new contributors. Read more about how we want to
write tests in the [style guide](/contribute/backend/style-guide.md).
## 104 - Refactor SqlStore ## 104 - Refactor SqlStore
**State:** Completed. **State:** Completed.
The `sqlstore` handlers all use a global xorm engine variable. Refactor them to use the `SqlStore` instance. The `sqlstore` handlers all use a global `xorm` engine variable. Refactor them to use the `SqlStore` instance.
## 105 - Avoid global HTTP handler functions ## 105 - Avoid global HTTP handler functions
**State:** Ongoing, passive. **State:** Ongoing, passive.
Refactor HTTP handlers so that the handler methods are on the HttpServer instance or a more detailed handler struct. E.g (AuthHandler). This ensures they get access to HttpServer service dependencies (and Cfg object) and can avoid global state. Refactor HTTP handlers so that the handler methods are on the `HttpServer` instance or a more detailed handler struct. For example, `AuthHandler`.
Doing so ensures that the handler methods get access to `HttpServer` service dependencies (and its `Cfg` object), so that global state may be avoided.
## 106 - Date comparison ## 106 - Compare dates
**State:** Ongoing, passive. **State:** Ongoing, passive.
Store newly introduced date columns in the database as epoch based Store newly introduced date columns in the database as epoch-based integers (that is, Unix timestamps) if they require date comparison.
integers (i.e. unix timestamps) if they require date comparison. This This permits you to have a unified approach for comparing dates against all the supported databases instead of needing to handle dates differently for each database.
permits a unified approach for comparing dates against all the supported Also, when you compare epoch-based integers you no longer need error-pruning transformations to and from other time zones.
databases instead of handling dates differently for each database. Also,
by comparing epoch based integers, we no longer need error pruning
transformations to and from other time zones.
## 107 - Avoid use of the simplejson package ## 107 - Avoid the `simplejson` package
**State:** Ongoing, passive **State:** Ongoing, passive
Use of the `simplejson` package (`pkg/components/simplejson`) in place Don't use the `simplejson` package (`pkg/components/simplejson`) instead of types (that is, Go structs) because this results in code that is difficult to maintain.
of types (Go structs) results in code that is difficult to maintain.
Instead, create types for objects and use the Go standard library's Instead, create types for objects and use the Go standard library's
[`encoding/json`](https://golang.org/pkg/encoding/json/) package. [`encoding/json`](https://golang.org/pkg/encoding/json/) package.
## 108 - Provisionable\* ## 108 - Enable provisioning
**State:** Abandoned: Grafana's file based refactoring is limited to work natively only on on-premise installations of Grafana. We're looking at enhancing the use of the API to enable provisioning for all Grafana instances. **State:** Abandoned: The file-based refactoring of Grafana is limited to work natively only on on-premise installations of Grafana.
We want to enhance the use of the API to enable provisioning for all Grafana instances in the future.
All new features that require state should be possible to configure using config files. For example: All new features that require state should be able to configure Grafana using configuration files.
For example:
- [Data sources](https://github.com/grafana/grafana/tree/main/pkg/services/provisioning/datasources) - [Data sources](https://github.com/grafana/grafana/tree/main/pkg/services/provisioning/datasources)
- [Alert notifiers](https://github.com/grafana/grafana/tree/main/pkg/services/provisioning/notifiers) - [Alert notifiers](https://github.com/grafana/grafana/tree/main/pkg/services/provisioning/notifiers)
- [Dashboards](https://github.com/grafana/grafana/tree/main/pkg/services/provisioning/dashboards) - [Dashboards](https://github.com/grafana/grafana/tree/main/pkg/services/provisioning/dashboards)
Today it's only possible to provision data sources and dashboards but this is something we want to support all over Grafana. Today it's only possible to provision data sources and dashboards, but we want to support it throughout Grafana in the future.
### 109 - Use context.Context "everywhere" ### 109 - Use `context.Context`
**State:** Completed. **State:** Completed.
The package [context](https://golang.org/pkg/context/) should be used You should use and propagate the package [`context`](https://golang.org/pkg/context/) through all the layers of your code.
and propagated through all the layers of the code. For example the For example, the `context.Context` of an incoming API request should be propagated to any other layers being used, such as the bus, service layer, and database layer.
`context.Context` of an incoming API request should be propagated to any Utility functions and methods normally don't need `context.Context`.
other layers being used such as the bus, service and database layers. To follow Go best practices, any function or method that receives a
Utility functions/methods normally doesn't need `context.Context`. `context.Context` argument should receive it as its [first parameter](https://github.com/golang/go/wiki/CodeReviewComments#contexts).
To follow Go best practices, any function/method that receives a
[`context.Context` argument should receive it as its first parameter](https://github.com/golang/go/wiki/CodeReviewComments#contexts).
To be able to solve certain problems and/or implement and support We encourage you to make sure that `context.Context` is passed down through all layers of your code.
certain features making sure that `context.Context` is passed down When you provide contextual information for the full life cycle of an API request, Grafana can use contextual logging. It also provides contextual information about the
through all layers of the code is vital. Being able to provide authenticated user, and it creates multiple spans for a distributed trace of service calls, database queries, and so on.
contextual information for the full life-cycle of an API request allows
us to use contextual logging, provide contextual information about the
authenticated user, create multiple spans for a distributed trace of
service calls and database queries etc.
Code should use `context.TODO` when it's unclear which Context to use, Code should use `context.TODO` whenever it's unclear which `Context` to use,
or it is not yet available (because the surrounding function has not yet or if it isn't yet available because the surrounding function hasn't yet
been extended to accept a `context.Context` argument). been extended to accept a `context.Context` argument. For more details, refer to the documentation:
More details in [Services](/contribute/backend/services.md), [Communication](/contribute/backend/communication.md) and [Database](/contribute/backend/database.md). - [Services](/contribute/backend/services.md)
- [Communication](/contribute/backend/communication.md)
[Original design doc](https://docs.google.com/document/d/1ebUhUVXU8FlShezsN-C64T0dOoo-DaC9_r-c8gB2XEU/edit#). - [Database](/contribute/backend/database.md)
## 110 - Move API error handling to service layer ## 110 - Move API error handling to service layer
**State:** Ongoing, passive. **State:** Ongoing, passive.
All errors returned from Grafana's services should carry a status and All errors returned from services in Grafana should carry a status and
the information necessary to provide a structured end-user facing the information necessary to provide a structured message that faces the end-user. Structured messages can be displayed on the frontend and may be [internationalized](../internationalization.md).
message that the frontend can display and internationalize for
end-users.
More details in [Errors](/contribute/backend/errors.md). To learn more, refer to [Errors](/contribute/backend/errors.md).

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# Support bundles # Support bundles
Support bundles are a way to collect all the information needed to debug a problem. Support bundles comprehensively collect the information needed for debugging. Specifically, support bundles function as an archive that contains one file per collector that is selected by the user.
They are generated from the support bundle menu in the UI under the Help section.
The support bundle is an archive that contains one file per collector selected by Generally, collectors are functions in the backend that collect information about the service in which they are running. Services can register collectors during their initialization.
the user.
Collectors are functions in the backend that collect information about the service they are running in. ## Find the support bundle information
Services can register collectors during their initialization.
## Adding a new support bundle collector Support bundles are generated from information located in the Grafana UI's online documentation. Under **Help**, select the **Support bundle** menu.
To add a new support bundle collector, you need to follow these steps, ## Add a new support bundle collector
we'll use the usage stats service as an example:
To add a new support bundle collector, follow these steps which use the usage stats service as an example. For example:
1. Import the support bundles registry in the service's `ProvideService` function: 1. Import the support bundles registry in the service's `ProvideService` function:
```go ```go
type UsageStats struct { type UsageStats struct {
... ...
} }
func ProvideService( func ProvideService(
... ...
bundleRegistry supportbundles.Service, // Bundle registry bundleRegistry supportbundles.Service, // Bundle registry
) (*UsageStats, error) ) (*UsageStats, error)
``` ```
2. `make gen-go` will then be able to wire the registry to the service. After importing the support bundle, run `make gen-go` to wire the registry to the service.
3. Implement the collector 1. Implement the collector. For example:
```go ```go
func (uss *UsageStats) supportBundleCollector() supportbundles.Collector { func (uss *UsageStats) supportBundleCollector() supportbundles.Collector {
return supportbundles.Collector{ return supportbundles.Collector{
UID: "usage-stats", // unique ID for the collector UID: "usage-stats", // Unique ID for the collector
DisplayName: "Usage statistics", // display name for the collector in the UI DisplayName: "Usage statistics", // Display name for the collector in the UI
Description: "Usage statistics of the Grafana instance", // description for the collector in the UI Description: "Usage statistics of the Grafana instance", // Description for the collector in the UI
IncludedByDefault: false, // whether the collector is included by default in the support bundle and can't be deselected. Most times you want this to be false. IncludedByDefault: false, // Indicates whether the collector is included by default in the support bundle and can't be deselected. Usually you want this to be false.
Default: false, // whether the collector is selected by default in the support bundle. User can still deselect it. Default: false, // Indicates whether the collector is selected by default in the support bundle. User can still deselect it.
// Function that will actually collect the file during the support bundle generation. // Function that will actually collect the file during the support bundle generation.
Fn: func(ctx context.Context) (*supportbundles.SupportItem, error) { Fn: func(ctx context.Context) (*supportbundles.SupportItem, error) {
// Add your service's logic to collect the information you need // Add your service's logic to collect the information you need
// In this example we are collecting the usage stats and marshalling them to JSON // In this example we collect the usage stats and place them appropriately in JSON
// This helps us get information about the usage of the Grafana instance // This helps us get information about the usage of the Grafana instance
report, err := uss.GetUsageReport(context.Background()) report, err := uss.GetUsageReport(context.Background())
if err != nil { if err != nil {
return nil, err return nil, err
} }
data, err := json.Marshal(report) data, err := json.Marshal(report)
if err != nil { if err != nil {
return nil, err return nil, err
} }
return &supportbundles.SupportItem{ return &supportbundles.SupportItem{
// filename of the file in the archive // Filename of the file in the archive
// can be any extension. (most common is .json and .md) // Can be any extension (most commonly, .json and .md).
Filename: "usage-stats.json", Filename: "usage-stats.json",
FileBytes: data, // []byte of the file FileBytes: data, // []byte of the file
}, nil }, nil
}, },
} }
} }
``` ```
4. Register the collector in the service's `ProvideService` function: 1. Register the collector in the service's `ProvideService` function. For example:
```go ```go
func ProvideService( func ProvideService(

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# Upgrade dependencies
We recommend the practices in this documentation when upgrading the various backend dependencies of Grafana.
## Protocol buffers (protobufs)
Use the most recent stable version of the [protobuf library](http://github.com/golang/protobuf) in Grafana and the plugin SDK.
Additionally, you typically want to upgrade your protobuf compiler toolchain and re-compile the protobuf files.
> **Note:** You need Buf CLI installed and available in your path. For instructions, refer to the [Buf Docs documentation](https://buf.build/docs/installation).
After you've installed Buf CLI, re-compile the protobuf files in Grafana and the plugin SDK. Use this code:
```shell
cd $GRAFANA
make protobuf
cd $GRAFANA_PLUGIN_SDK_GO
mage protobuf
```
After upgrading the protobuf dependency in Grafana and the plugin SDK, it is a best practice to test that your code still works before creating your PR. Specifically:
- Test a plugin built with upgraded SDK on upgraded Grafana
- Test a plugin built with non-upgraded SDK on upgraded Grafana
- Test a plugin built with upgraded SDK on non-upgraded Grafana

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# Upgrade Go version
We recommend the practices outlined in this documentation when you upgrade Go for use in Grafana development.
## Example PR
Refer to the following PR for an example of how to perform a Go upgrade:
- [PR ##79329](https://github.com/grafana/grafana/pull/79329)
## Main areas to update
Change at least the following parts of Go and related files:
- [`go.mod`](/go.mod#L3)
- [`go.work`](/go.work#L1)
- [`scripts/drone/variables.star`](/scripts/drone/variables.star#L6)
- [`Makefile`](/Makefile#L12)
- [`Dockerfile`](/Dockerfile#L6)
Then, run `go mod tidy` and `go work sync`. Also, run `make drone` so changes reflect the updates to `.star` and `drone.yml` files.
### Additional files to change
- Look in the `.github/workflows` folder for what Go version is being used there in various workflows.
- Make sure to create a PR with the corresponding changes in the `grafana/grafana-enterprise` repository.

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# Upgrading dependencies
Notes on upgrading various backend dependencies.
## Protobuf
When upgrading the [protobuf](http://github.com/golang/protobuf) library in Grafana and the plugin SDK,
you typically also want to upgrade your protobuf compiler toolchain and re-compile protobuf files.
**Note:** You need Buf CLI installed and availabile in your path, see https://buf.build/docs/installation for instructions.
Re-compile protobuf files in grafana and the plugin SDK:
```shell
cd $GRAFANA
make protobuf
cd $GRAFANA_PLUGIN_SDK_GO
mage protobuf
```
After upgrading the protobuf dependency in Grafana and the plugin SDK, it might be wise to test that things still work,
before making corresponding PRs:
- Test a plugin built with upgraded SDK on upgraded Grafana
- Test a plugin built with non-upgraded SDK on upgraded Grafana
- Test a plugin built with upgraded SDK on non-upgraded Grafana

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# Upgrading Go Version
Notes on upgrading Go version.
Example PR: https://github.com/grafana/grafana/pull/79329
## The main areas that need to change during the upgrade are:
- [`go.mod`](/go.mod#L3)
- [`go.work`](/go.work#L1)
- [`scripts/drone/variables.star`](/scripts/drone/variables.star#L6)
- [`Makefile`](/Makefile#L12)
- [`Dockerfile`](/Dockerfile#L6)
Then, run `go mod tidy` and `go work sync`. Also run `make drone` so changes to `.star` files are reflected and `drone.yml` is updated.
### Additional files to change
- Take a look in `.github/workflows` folder for what `go` version is being used there in various workflows.
- Make sure to create a PR with the corresponding changes in `grafana/grafana-enterprise` repository.