flagsmith

package module
v4.4.0 Latest Latest
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 Go to latest Published: Jun 26, 2025 License: BSD-3-Clause Imports: 22 Imported by: 1

README

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Flagsmith Go SDK

Flagsmith allows you to manage feature flags and remote config across multiple projects, environments and organisations.

This is the SDK for go for https://flagsmith.com/.

Adding to your project

For full documentation visit https://docs.flagsmith.com/clients/server-side?language=go.

Contributing

Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.

Getting Help

If you encounter a bug or feature request we would like to hear about it. Before you submit an issue please search existing issues in order to prevent duplicates.

Get in touch

If you have any questions about our projects you can email support@flagsmith.com.

Documentation

Index

Constants

View Source 
const (
	// Number of seconds to wait for a request to
	// complete before terminating the request.
	DefaultTimeout = 10 * time.Second

	// Default base URL for the API.
	DefaultBaseURL = "https://edge.api.flagsmith.com/api/v1/"

	BulkIdentifyMaxCount   = 100
	DefaultRealtimeBaseUrl = "https://realtime.flagsmith.com/"
)
View Source 
const (
	OptionWithHTTPClient  = "WithHTTPClient"
	OptionWithRestyClient = "WithRestyClient"
)
View Source 
const AnalyticsEndpoint = "analytics/flags/"
View Source 
const AnalyticsTimerInMilli = 10 * 1000
View Source 
const EnvironmentKeyHeader = "X-Environment-Key"

Variables

This section is empty.

Functions

func WithEvaluationContext 

func WithEvaluationContext(ctx context.Context, ec EvaluationContext) context.Context

Returns context with provided EvaluationContext instance set.

Types

type AnalyticsProcessor 

type AnalyticsProcessor struct {
	// contains filtered or unexported fields
}

func NewAnalyticsProcessor 

func NewAnalyticsProcessor(ctx context.Context, client *resty.Client, baseURL string, timerInMilli *int, log Logger) *AnalyticsProcessor

func (*AnalyticsProcessor) Flush 

func (a *AnalyticsProcessor) Flush(ctx context.Context) error

func (*AnalyticsProcessor) TrackFeature 

func (a *AnalyticsProcessor) TrackFeature(featureName string)

type Client 

type Client struct {
	// contains filtered or unexported fields
}

Client provides various methods to query Flagsmith API.

func NewClient 

func NewClient(apiKey string, options ...Option) *Client

NewClient creates instance of Client with given configuration.

func (*Client) BulkIdentify 

func (c *Client) BulkIdentify(ctx context.Context, batch []*IdentityTraits) error

BulkIdentify can be used to create/overwrite identities(with traits) in bulk NOTE: This method only works with Edge API endpoint.

func (*Client) GetEnvironmentFlags 

func (c *Client) GetEnvironmentFlags(ctx context.Context) (f Flags, err error)

GetEnvironmentFlags calls GetFlags using the current environment as the EvaluationContext. Equivalent to GetFlags(ctx, nil).

func (*Client) GetEnvironmentFlagsFromAPI 

func (c *Client) GetEnvironmentFlagsFromAPI(ctx context.Context) (Flags, error)

GetEnvironmentFlagsFromAPI tries to contact the Flagsmith API to get the latest environment data. Will return an error in case of failure or unexpected response.

func (*Client) GetFlags 

func (c *Client) GetFlags(ctx context.Context, ec *EvaluationContext) (f Flags, err error)

GetFlags evaluates the feature flags within an EvaluationContext.

When flag evaluation fails, the value of each Flag is determined by the default flag handler from WithDefaultHandler, if one was provided.

Flags are evaluated remotely by the Flagsmith API by default. To evaluate flags locally, instantiate a client using WithLocalEvaluation.

func (*Client) GetIdentityFlags 

func (c *Client) GetIdentityFlags(ctx context.Context, identifier string, traits []*Trait) (f Flags, err error)

GetIdentityFlags calls GetFlags using this identifier and traits as the EvaluationContext.

func (*Client) GetIdentityFlagsFromAPI 

func (c *Client) GetIdentityFlagsFromAPI(ctx context.Context, identifier string, traits []*Trait) (Flags, error)

GetIdentityFlagsFromAPI tries to contact the Flagsmith API to get the latest identity flags. Will return an error in case of failure or unexpected response.

func (*Client) GetIdentitySegments 

func (c *Client) GetIdentitySegments(identifier string, traits []*Trait) ([]*segments.SegmentModel, error)

Returns an array of segments that the given identity is part of.

func (*Client) UpdateEnvironment 

func (c *Client) UpdateEnvironment(ctx context.Context) error

type EnvironmentEvaluationContext 

type EnvironmentEvaluationContext struct {
	// APIKey is an identifier for this environment. It is also known as the environment ID or client-side SDK key.
	APIKey string `json:"api_key"`
}

EnvironmentEvaluationContext represents a Flagsmith environment used in an EvaluationContext. It is ignored if the evaluating Client was created using WithLocalEvaluation.

type EvaluationContext 

type EvaluationContext struct {
	Environment *EnvironmentEvaluationContext `json:"environment,omitempty"`
	Identity    *IdentityEvaluationContext    `json:"identity,omitempty"`
	Feature     *FeatureEvaluationContext     `json:"feature,omitempty"`
}

EvaluationContext represents a context in which feature flags can be evaluated. Flagsmith flags are always evaluated in an EnvironmentEvaluationContext, with an optional IdentityEvaluationContext.

func GetEvaluationContextFromCtx 

func GetEvaluationContextFromCtx(ctx context.Context) (ec EvaluationContext, ok bool)

Retrieve EvaluationContext instance from context.

func NewEvaluationContext 

func NewEvaluationContext(identifier string, traits map[string]interface{}) EvaluationContext

func NewTransientEvaluationContext 

func NewTransientEvaluationContext(identifier string, traits map[string]interface{}) EvaluationContext

type FeatureEvaluationContext 

type FeatureEvaluationContext struct {
	Name string `json:"name"`
}

FeatureEvaluationContext is not yet implemented.

type Flag 

type Flag struct {
	Enabled     bool
	Value       interface{}
	IsDefault   bool
	FeatureID   int
	FeatureName string
}

type Flags 

type Flags struct {
	// contains filtered or unexported fields
}

func (*Flags) AllFlags 

func (f *Flags) AllFlags() []Flag

Returns an array of all flag objects.

func (*Flags) GetFeatureValue 

func (f *Flags) GetFeatureValue(featureName string) (interface{}, error)

Returns the value of a particular flag.

func (*Flags) GetFlag 

func (f *Flags) GetFlag(featureName string) (Flag, error)

Returns a specific flag given the name of the feature.

func (*Flags) IsFeatureEnabled 

func (f *Flags) IsFeatureEnabled(featureName string) (bool, error)

Returns a boolean indicating whether a particular flag is enabled.

type FlagsmithAPIError 

type FlagsmithAPIError struct {
	Msg                string
	Err                error
	ResponseStatusCode int
	ResponseStatus     string
}

func (FlagsmithAPIError) Error 

func (e FlagsmithAPIError) Error() string

type FlagsmithClientError 

type FlagsmithClientError struct {
	// contains filtered or unexported fields
}

func (FlagsmithClientError) Error 

func (e FlagsmithClientError) Error() string

type IdentityEvaluationContext 

type IdentityEvaluationContext struct {
	Identifier *string                            `json:"identifier,omitempty"`
	Traits     map[string]*TraitEvaluationContext `json:"traits,omitempty"`
	Transient  *bool                              `json:"transient,omitempty"`
}

IdentityEvaluationContext represents a Flagsmith identity within a Flagsmith environment, used in an EvaluationContext. Traits are application-defined key-value pairs which can be used as part of the flag evaluation context. Flagsmith will not persist Transient identities when flags are remotely evaluated.

type IdentityTraits 

type IdentityTraits struct {
	Identifier string   `json:"identifier"`
	Traits     []*Trait `json:"traits"`
	Transient  bool     `json:"transient,omitempty"`
}

type LocalFileHandler 

type LocalFileHandler struct {
	// contains filtered or unexported fields
}

func NewLocalFileHandler 

func NewLocalFileHandler(environmentDocumentPath string) (*LocalFileHandler, error)

NewLocalFileHandler creates a new LocalFileHandler with the given path.

func (*LocalFileHandler) GetEnvironment 

func (handler *LocalFileHandler) GetEnvironment() *environments.EnvironmentModel

type Logger 

type Logger interface {
	// Errorf logs an error message with the given format and arguments.
	Errorf(format string, v ...interface{})

	// Warnf logs a warning message with the given format and arguments.
	Warnf(format string, v ...interface{})

	// Debugf logs a debug message with the given format and arguments.
	Debugf(format string, v ...interface{})
}

Logger is the interface used for logging by flagsmith client. This interface defines the methods that a logger implementation must implement. It is used to abstract logging and enable clients to use any logger implementation they want.

type OfflineHandler 

type OfflineHandler interface {
	GetEnvironment() *environments.EnvironmentModel
}

type Option 

type Option func(c *Client)

func WithAnalytics 

func WithAnalytics(ctx context.Context) Option

WithAnalytics enables tracking of the usage of the Feature flags.

The goroutine responsible for asynchronously uploading the locally stored cache uses the context provided here, which means that if it expires the background process will exit.

func WithBaseURL 

func WithBaseURL(url string) Option

func WithCustomHeaders 

func WithCustomHeaders(headers map[string]string) Option

func WithDefaultHandler 

func WithDefaultHandler(handler func(string) (Flag, error)) Option

func WithEnvironmentRefreshInterval 

func WithEnvironmentRefreshInterval(interval time.Duration) Option

func WithErrorHandler 

func WithErrorHandler(handler func(handler *FlagsmithAPIError)) Option

WithErrorHandler provides a way to handle errors that occur during update of an environment.

func WithHTTPClient added in v4.3.0 

func WithHTTPClient(httpClient *http.Client) Option

func WithLocalEvaluation 

func WithLocalEvaluation(ctx context.Context) Option

WithLocalEvaluation enables local evaluation of the Feature flags.

The goroutine responsible for asynchronously updating the environment makes use of the context provided here, which means that if it expires the background process will exit.

func WithLogger 

func WithLogger(logger Logger) Option

Allows the client to use any logger that implements the `Logger` interface.

func WithOfflineHandler 

func WithOfflineHandler(handler OfflineHandler) Option

WithOfflineHandler returns an Option function that sets the offline handler.

func WithOfflineMode 

func WithOfflineMode() Option

WithOfflineMode returns an Option function that enables the offline mode. NOTE: before using this option, you should set the offline handler.

func WithPolling added in v4.2.0 

func WithPolling() Option

WithPolling makes it so that the client will poll for updates even when WithRealtime is used.

func WithProxy 

func WithProxy(proxyURL string) Option

WithProxy returns an Option function that sets the proxy(to be used by internal resty client). The proxyURL argument is a string representing the URL of the proxy server to use, e.g. "http://proxy.example.com:8080".

func WithRealtime added in v4.1.0 

func WithRealtime() Option

WithRealtime returns an Option function that enables real-time updates for the Client. NOTE: Before enabling real-time updates, ensure that local evaluation is enabled.

func WithRealtimeBaseURL added in v4.1.0 

func WithRealtimeBaseURL(url string) Option

WithRealtimeBaseURL returns an Option function for configuring the real-time base URL of the Client.

func WithRemoteEvaluation 

func WithRemoteEvaluation() Option

func WithRequestTimeout 

func WithRequestTimeout(timeout time.Duration) Option

func WithRestyClient added in v4.3.0 

func WithRestyClient(restyClient *resty.Client) Option

func WithRetries 

func WithRetries(count int, waitTime time.Duration) Option

func WithSlogLogger added in v4.2.0 

func WithSlogLogger(logger *slog.Logger) Option

WithSlogLogger allows the client to use a slog.Logger for logging.

type Trait 

type Trait struct {
	TraitKey   string      `json:"trait_key"`
	TraitValue interface{} `json:"trait_value"`
	Transient  bool        `json:"transient,omitempty"`
}

func (*Trait) ToTraitModel 

func (t *Trait) ToTraitModel() *traits.TraitModel

type TraitEvaluationContext 

type TraitEvaluationContext struct {
	Transient *bool       `json:"transient,omitempty"`
	Value     interface{} `json:"value"`
}

TraitEvaluationContext represents a single trait value used within an IdentityEvaluationContext. A Transient trait will not be persisted.

func NewTraitEvaluationContext 

func NewTraitEvaluationContext(value interface{}, transient bool) TraitEvaluationContext

Source Files

View all Source files

Directories

Path Synopsis
environments
environments/integrations
features
identities
identities/traits
organisations
projects
segments
utils
utils/fixtures

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