openfeature

package
v0.5.0 Latest Latest
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 Go to latest Published: Oct 3, 2022 License: Apache-2.0 Imports: 6 Imported by: 15

Documentation

Overview

Package openfeature provides global access to the OpenFeature API.

Index

Examples

Constants

View Source 
const (
	// DefaultReason - the resolved value was configured statically, or otherwise fell back to a pre-configured value.
	DefaultReason Reason = "DEFAULT"
	// TargetingMatchReason - the resolved value was the result of a dynamic evaluation, such as a rule or specific user-targeting.
	TargetingMatchReason Reason = "TARGETING_MATCH"
	// SplitReason - the resolved value was the result of pseudorandom assignment.
	SplitReason Reason = "SPLIT"
	// DisabledReason - the resolved value was the result of the flag being disabled in the management system.
	DisabledReason Reason = "DISABLED"
	// UnknownReason - the reason for the resolved value could not be determined.
	UnknownReason Reason = "UNKNOWN"
	// ErrorReason - the resolved value was the result of an error.
	ErrorReason Reason = "ERROR"

	TargetingKey string = "targetingKey" // evaluation context map key. The targeting key uniquely identifies the subject (end-user, or client service) of a flag evaluation.
)

Variables

This section is empty.

Functions

func AddHooks 

func AddHooks(hooks ...Hook)

AddHooks appends to the collection of any previously added hooks

func SetEvaluationContext 

func SetEvaluationContext(evalCtx EvaluationContext)

SetEvaluationContext sets the global evaluation context.

func SetLogger 

func SetLogger(l logr.Logger)

SetLogger sets the global logger.

func SetProvider 

func SetProvider(provider FeatureProvider)

SetProvider sets the global provider.

Types

type BoolResolutionDetail 

type BoolResolutionDetail struct {
	Value bool
	ProviderResolutionDetail
}

BoolResolutionDetail provides a resolution detail with boolean type

type BooleanEvaluationDetails added in v0.5.0 

type BooleanEvaluationDetails struct {
	Value bool
	EvaluationDetails
}

type Client 

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

Client implements the behaviour required of an openfeature client

func NewClient 

func NewClient(name string) *Client

NewClient returns a new Client. Name is a unique identifier for this client

Example 
package main

import (
	"fmt"

	"github.com/open-feature/go-sdk/pkg/openfeature"
)

func main() {
	client := openfeature.NewClient("example-client")
	fmt.Printf("Client Name: %s", client.Metadata().Name())
}

Output:

Client Name: example-client

func (*Client) AddHooks 

func (c *Client) AddHooks(hooks ...Hook)

AddHooks appends to the client's collection of any previously added hooks

func (Client) BooleanValue 

func (c Client) BooleanValue(ctx context.Context, flag string, defaultValue bool, evalCtx EvaluationContext, options ...Option) (bool, error)

BooleanValue performs a flag evaluation that returns a boolean.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

Example 
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/open-feature/go-sdk/pkg/openfeature"
)

func main() {
	client := openfeature.NewClient("example-client")
	value, err := client.BooleanValue(
		context.Background(), "test-flag", true, openfeature.EvaluationContext{},
	)
	if err != nil {
		log.Fatal("error while getting boolean value : ", err)
	}

	fmt.Printf("test-flag value: %v", value)
}

Output:

test-flag value: true

func (Client) BooleanValueDetails 

func (c Client) BooleanValueDetails(ctx context.Context, flag string, defaultValue bool, evalCtx EvaluationContext, options ...Option) (BooleanEvaluationDetails, error)

BooleanValueDetails performs a flag evaluation that returns an evaluation details struct.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

func (*Client) EvaluationContext 

func (c *Client) EvaluationContext() EvaluationContext

EvaluationContext returns the client's evaluation context

func (Client) FloatValue 

func (c Client) FloatValue(ctx context.Context, flag string, defaultValue float64, evalCtx EvaluationContext, options ...Option) (float64, error)

FloatValue performs a flag evaluation that returns a float64.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

Example 
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/open-feature/go-sdk/pkg/openfeature"
)

func main() {
	client := openfeature.NewClient("example-client")
	value, err := client.FloatValue(
		context.Background(), "test-flag", 0.55, openfeature.EvaluationContext{},
	)
	if err != nil {
		log.Fatalf("error while getting float value: %v", err)
	}

	fmt.Printf("test-flag value: %v", value)
}

Output:

test-flag value: 0.55

func (Client) FloatValueDetails 

func (c Client) FloatValueDetails(ctx context.Context, flag string, defaultValue float64, evalCtx EvaluationContext, options ...Option) (FloatEvaluationDetails, error)

FloatValueDetails performs a flag evaluation that returns an evaluation details struct.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

func (Client) IntValue 

func (c Client) IntValue(ctx context.Context, flag string, defaultValue int64, evalCtx EvaluationContext, options ...Option) (int64, error)

IntValue performs a flag evaluation that returns an int64.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

Example 
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/open-feature/go-sdk/pkg/openfeature"
)

func main() {
	client := openfeature.NewClient("example-client")
	value, err := client.IntValue(
		context.Background(), "test-flag", 3, openfeature.EvaluationContext{},
	)
	if err != nil {
		log.Fatalf("error while getting int value: %v", err)
	}

	fmt.Printf("test-flag value: %v", value)
}

Output:

test-flag value: 3

func (Client) IntValueDetails 

func (c Client) IntValueDetails(ctx context.Context, flag string, defaultValue int64, evalCtx EvaluationContext, options ...Option) (IntEvaluationDetails, error)

IntValueDetails performs a flag evaluation that returns an evaluation details struct.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

func (Client) Metadata 

func (c Client) Metadata() ClientMetadata

Metadata returns the client's metadata

func (Client) ObjectValue 

func (c Client) ObjectValue(ctx context.Context, flag string, defaultValue interface{}, evalCtx EvaluationContext, options ...Option) (interface{}, error)

ObjectValue performs a flag evaluation that returns an object.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

Example 
package main

import (
	"context"
	"encoding/json"
	"fmt"
	"log"

	"github.com/open-feature/go-sdk/pkg/openfeature"
)

func main() {
	client := openfeature.NewClient("example-client")
	value, err := client.ObjectValue(
		context.Background(), "test-flag", map[string]string{"foo": "bar"}, openfeature.EvaluationContext{},
	)
	if err != nil {
		log.Fatal("error while getting object value : ", err)
	}

	str, _ := json.Marshal(value)
	fmt.Printf("test-flag value: %v", string(str))
}

Output:

test-flag value: {"foo":"bar"}

func (Client) ObjectValueDetails 

func (c Client) ObjectValueDetails(ctx context.Context, flag string, defaultValue interface{}, evalCtx EvaluationContext, options ...Option) (InterfaceEvaluationDetails, error)

ObjectValueDetails performs a flag evaluation that returns an evaluation details struct.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

func (*Client) SetEvaluationContext 

func (c *Client) SetEvaluationContext(evalCtx EvaluationContext)

SetEvaluationContext sets the client's evaluation context

func (Client) StringValue 

func (c Client) StringValue(ctx context.Context, flag string, defaultValue string, evalCtx EvaluationContext, options ...Option) (string, error)

StringValue performs a flag evaluation that returns a string.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

Example 
package main

import (
	"context"
	"fmt"
	"log"

	"github.com/open-feature/go-sdk/pkg/openfeature"
)

func main() {
	client := openfeature.NewClient("example-client")
	value, err := client.StringValue(
		context.Background(), "test-flag", "openfeature", openfeature.EvaluationContext{},
	)
	if err != nil {
		log.Fatal("error while getting string value : ", err)
	}

	fmt.Printf("test-flag value: %v", value)
}

Output:

test-flag value: openfeature

func (Client) StringValueDetails 

func (c Client) StringValueDetails(ctx context.Context, flag string, defaultValue string, evalCtx EvaluationContext, options ...Option) (StringEvaluationDetails, error)

StringValueDetails performs a flag evaluation that returns an evaluation details struct.

Parameters: - ctx is the standard go context struct used to manage requests (e.g. timeouts) - flag is the key that uniquely identifies a particular flag - defaultValue is returned if an error occurs - evalCtx is the evaluation context used in a flag evaluation (not to be confused with ctx) - options are optional additional evaluation options e.g. WithHooks & WithHookHints

func (*Client) WithLogger 

func (c *Client) WithLogger(l logr.Logger) *Client

WithLogger sets the logger of the client

type ClientMetadata 

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

ClientMetadata provides a client's metadata

func (ClientMetadata) Name 

func (cm ClientMetadata) Name() string

Name returns the client's name

type ErrorCode added in v0.5.0 

type ErrorCode string
const (
	// ProviderNotReadyCode - the value was resolved before the provider was ready.
	ProviderNotReadyCode ErrorCode = "PROVIDER_NOT_READY"
	// FlagNotFoundCode - the flag could not be found.
	FlagNotFoundCode ErrorCode = "FLAG_NOT_FOUND"
	// ParseErrorCode - an error was encountered parsing data, such as a flag configuration.
	ParseErrorCode ErrorCode = "PARSE_ERROR"
	// TypeMismatchCode - the type of the flag value does not match the expected type.
	TypeMismatchCode ErrorCode = "TYPE_MISMATCH"
	// TargetingKeyMissingCode - the provider requires a targeting key and one was not provided in the evaluation context.
	TargetingKeyMissingCode ErrorCode = "TARGETING_KEY_MISSING"
	// InvalidContextCode - the evaluation context does not meet provider requirements.
	InvalidContextCode ErrorCode = "INVALID_CONTEXT"
	// GeneralCode - the error was for a reason not enumerated above.
	GeneralCode ErrorCode = "GENERAL"
)

type EvaluationContext 

type EvaluationContext struct {
	TargetingKey string                 `json:"targetingKey"` // uniquely identifying the subject (end-user, or client service) of a flag evaluation
	Attributes   map[string]interface{} `json:"attributes"`
}

EvaluationContext https://github.com/open-feature/spec/blob/main/specification/evaluation-context/evaluation-context.md

type EvaluationDetails 

type EvaluationDetails struct {
	FlagKey  string
	FlagType Type
	ResolutionDetail
}

type EvaluationOptions 

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

EvaluationOptions should contain a list of hooks to be executed for a flag evaluation

func (EvaluationOptions) HookHints 

func (e EvaluationOptions) HookHints() HookHints

HookHints returns evaluation options' hook hints

func (EvaluationOptions) Hooks 

func (e EvaluationOptions) Hooks() []Hook

Hooks returns evaluation options' hooks

type FeatureProvider 

type FeatureProvider interface {
	Metadata() Metadata
	BooleanEvaluation(ctx context.Context, flag string, defaultValue bool, evalCtx FlattenedContext) BoolResolutionDetail
	StringEvaluation(ctx context.Context, flag string, defaultValue string, evalCtx FlattenedContext) StringResolutionDetail
	FloatEvaluation(ctx context.Context, flag string, defaultValue float64, evalCtx FlattenedContext) FloatResolutionDetail
	IntEvaluation(ctx context.Context, flag string, defaultValue int64, evalCtx FlattenedContext) IntResolutionDetail
	ObjectEvaluation(ctx context.Context, flag string, defaultValue interface{}, evalCtx FlattenedContext) InterfaceResolutionDetail
	Hooks() []Hook
}

FeatureProvider interface defines a set of functions that can be called in order to evaluate a flag. vendors should implement

type FlattenedContext added in v0.5.0 

type FlattenedContext map[string]interface{}

FlattenedContext contains metadata for a given flag evaluation in a flattened structure. TargetingKey ("targetingKey") is stored as a string value if provided in the evaluation context.

type FloatEvaluationDetails added in v0.5.0 

type FloatEvaluationDetails struct {
	Value float64
	EvaluationDetails
}

type FloatResolutionDetail 

type FloatResolutionDetail struct {
	Value float64
	ProviderResolutionDetail
}

FloatResolutionDetail provides a resolution detail with float64 type

type Hook 

type Hook interface {
	Before(hookContext HookContext, hookHints HookHints) (*EvaluationContext, error)
	After(hookContext HookContext, flagEvaluationDetails InterfaceEvaluationDetails, hookHints HookHints) error
	Error(hookContext HookContext, err error, hookHints HookHints)
	Finally(hookContext HookContext, hookHints HookHints)
}

Hook allows application developers to add arbitrary behavior to the flag evaluation lifecycle. They operate similarly to middleware in many web frameworks. https://github.com/open-feature/spec/blob/main/specification/hooks.md

type HookContext 

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

HookContext defines the base level fields of a hook context

func (HookContext) ClientMetadata 

func (h HookContext) ClientMetadata() ClientMetadata

ClientMetadata returns the client's metadata

func (HookContext) DefaultValue 

func (h HookContext) DefaultValue() interface{}

DefaultValue returns the hook context's default value

func (HookContext) EvaluationContext 

func (h HookContext) EvaluationContext() EvaluationContext

EvaluationContext returns the hook context's EvaluationContext

func (HookContext) FlagKey 

func (h HookContext) FlagKey() string

FlagKey returns the hook context's flag key

func (HookContext) FlagType 

func (h HookContext) FlagType() Type

FlagType returns the hook context's flag type

func (HookContext) ProviderMetadata 

func (h HookContext) ProviderMetadata() Metadata

ProviderMetadata returns the provider's metadata

type HookHints 

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

HookHints contains a map of hints for hooks

func NewHookHints 

func NewHookHints(mapOfHints map[string]interface{}) HookHints

NewHookHints constructs HookHints

func (HookHints) Value 

func (h HookHints) Value(key string) interface{}

Value returns the value at the given key in the underlying map. Maintains immutability of the map.

type IClient 

type IClient interface {
	Metadata() ClientMetadata
	AddHooks(hooks ...Hook)
	SetEvaluationContext(evalCtx EvaluationContext)
	EvaluationContext() EvaluationContext
	BooleanValue(ctx context.Context, flag string, defaultValue bool, evalCtx EvaluationContext, options ...Option) (bool, error)
	StringValue(ctx context.Context, flag string, defaultValue string, evalCtx EvaluationContext, options ...Option) (string, error)
	FloatValue(ctx context.Context, flag string, defaultValue float64, evalCtx EvaluationContext, options ...Option) (float64, error)
	IntValue(ctx context.Context, flag string, defaultValue int64, evalCtx EvaluationContext, options ...Option) (int64, error)
	ObjectValue(ctx context.Context, flag string, defaultValue interface{}, evalCtx EvaluationContext, options ...Option) (interface{}, error)
	BooleanValueDetails(ctx context.Context, flag string, defaultValue bool, evalCtx EvaluationContext, options ...Option) (BooleanEvaluationDetails, error)
	StringValueDetails(ctx context.Context, flag string, defaultValue string, evalCtx EvaluationContext, options ...Option) (StringEvaluationDetails, error)
	FloatValueDetails(ctx context.Context, flag string, defaultValue float64, evalCtx EvaluationContext, options ...Option) (FloatEvaluationDetails, error)
	IntValueDetails(ctx context.Context, flag string, defaultValue int64, evalCtx EvaluationContext, options ...Option) (IntEvaluationDetails, error)
	ObjectValueDetails(ctx context.Context, flag string, defaultValue interface{}, evalCtx EvaluationContext, options ...Option) (InterfaceEvaluationDetails, error)
}

IClient defines the behaviour required of an openfeature client

type IntEvaluationDetails added in v0.5.0 

type IntEvaluationDetails struct {
	Value int64
	EvaluationDetails
}

type IntResolutionDetail 

type IntResolutionDetail struct {
	Value int64
	ProviderResolutionDetail
}

IntResolutionDetail provides a resolution detail with int64 type

type InterfaceEvaluationDetails added in v0.5.0 

type InterfaceEvaluationDetails struct {
	Value interface{}
	EvaluationDetails
}

type InterfaceResolutionDetail 

type InterfaceResolutionDetail struct {
	Value interface{}
	ProviderResolutionDetail
}

InterfaceResolutionDetail provides a resolution detail with interface{} type

type Metadata 

type Metadata struct {
	Name string
}

Metadata provides provider name

func ProviderMetadata 

func ProviderMetadata() Metadata

ProviderMetadata returns the global provider's metadata

type NoopProvider 

type NoopProvider struct{}

NoopProvider implements the FeatureProvider interface and provides functions for evaluating flags

func (NoopProvider) BooleanEvaluation 

func (e NoopProvider) BooleanEvaluation(ctx context.Context, flag string, defaultValue bool, evalCtx FlattenedContext) BoolResolutionDetail

BooleanEvaluation returns a boolean flag.

func (NoopProvider) FloatEvaluation 

func (e NoopProvider) FloatEvaluation(ctx context.Context, flag string, defaultValue float64, evalCtx FlattenedContext) FloatResolutionDetail

FloatEvaluation returns a float flag.

func (NoopProvider) Hooks 

func (e NoopProvider) Hooks() []Hook

Hooks returns hooks

func (NoopProvider) IntEvaluation 

func (e NoopProvider) IntEvaluation(ctx context.Context, flag string, defaultValue int64, evalCtx FlattenedContext) IntResolutionDetail

IntEvaluation returns an int flag.

func (NoopProvider) Metadata 

func (e NoopProvider) Metadata() Metadata

Metadata returns the metadata of the provider

func (NoopProvider) ObjectEvaluation 

func (e NoopProvider) ObjectEvaluation(ctx context.Context, flag string, defaultValue interface{}, evalCtx FlattenedContext) InterfaceResolutionDetail

ObjectEvaluation returns an object flag

func (NoopProvider) StringEvaluation 

func (e NoopProvider) StringEvaluation(ctx context.Context, flag string, defaultValue string, evalCtx FlattenedContext) StringResolutionDetail

StringEvaluation returns a string flag.

type Option added in v0.5.0 

type Option func(*EvaluationOptions)

Option applies a change to EvaluationOptions

func WithHookHints added in v0.5.0 

func WithHookHints(hookHints HookHints) Option

WithHookHints applies provided hook hints.

func WithHooks added in v0.5.0 

func WithHooks(hooks ...Hook) Option

WithHooks applies provided hooks.

type ProviderResolutionDetail added in v0.5.0 

type ProviderResolutionDetail struct {
	ResolutionError ResolutionError
	Reason          Reason
	Variant         string
}

ProviderResolutionDetail is a structure which contains a subset of the fields defined in the EvaluationDetail, representing the result of the provider's flag resolution process see https://github.com/open-feature/spec/blob/main/specification/types.md#resolution-details N.B we could use generics but to support older versions of go for now we will have type specific resolution detail

func (ProviderResolutionDetail) Error added in v0.5.0 

func (p ProviderResolutionDetail) Error() error

func (ProviderResolutionDetail) ResolutionDetail added in v0.5.0 

func (p ProviderResolutionDetail) ResolutionDetail() ResolutionDetail

type Reason added in v0.5.0 

type Reason string

Reason indicates the semantic reason for a returned flag value

type ResolutionDetail 

type ResolutionDetail struct {
	Variant      string
	Reason       Reason
	ErrorCode    ErrorCode
	ErrorMessage string
}

type ResolutionError added in v0.5.0 

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

ResolutionError is an enumerated error code with an optional message

func NewFlagNotFoundResolutionError added in v0.5.0 

func NewFlagNotFoundResolutionError(msg string) ResolutionError

NewFlagNotFoundResolutionError constructs a resolution error with code FLAG_NOT_FOUND

Explanation - The flag could not be found.

func NewGeneralResolutionError added in v0.5.0 

func NewGeneralResolutionError(msg string) ResolutionError

NewGeneralResolutionError constructs a resolution error with code GENERAL

Explanation - The error was for a reason not enumerated above.

func NewInvalidContextResolutionError added in v0.5.0 

func NewInvalidContextResolutionError(msg string) ResolutionError

NewInvalidContextResolutionError constructs a resolution error with code INVALID_CONTEXT

Explanation - The evaluation context does not meet provider requirements.

func NewParseErrorResolutionError added in v0.5.0 

func NewParseErrorResolutionError(msg string) ResolutionError

NewParseErrorResolutionError constructs a resolution error with code PARSE_ERROR

Explanation - An error was encountered parsing data, such as a flag configuration.

func NewProviderNotReadyResolutionError added in v0.5.0 

func NewProviderNotReadyResolutionError(msg string) ResolutionError

NewProviderNotReadyResolutionError constructs a resolution error with code PROVIDER_NOT_READY

Explanation - The value was resolved before the provider was ready.

func NewTargetingKeyMissingResolutionError added in v0.5.0 

func NewTargetingKeyMissingResolutionError(msg string) ResolutionError

NewTargetingKeyMissingResolutionError constructs a resolution error with code TARGETING_KEY_MISSING

Explanation - The provider requires a targeting key and one was not provided in the evaluation context.

func NewTypeMismatchResolutionError added in v0.5.0 

func NewTypeMismatchResolutionError(msg string) ResolutionError

NewTypeMismatchResolutionError constructs a resolution error with code TYPE_MISMATCH

Explanation - The type of the flag value does not match the expected type.

func (ResolutionError) Error added in v0.5.0 

func (r ResolutionError) Error() string

type StringEvaluationDetails added in v0.5.0 

type StringEvaluationDetails struct {
	Value string
	EvaluationDetails
}

type StringResolutionDetail 

type StringResolutionDetail struct {
	Value string
	ProviderResolutionDetail
}

StringResolutionDetail provides a resolution detail with string type

type Type 

type Type int64

Type represents the type of a flag 

const (
	Boolean Type = iota
	String
	Float
	Int
	Object
)

func (Type) String 

func (t Type) String() string

type UnimplementedHook 

type UnimplementedHook struct{}

UnimplementedHook implements all hook methods with empty functions Include UnimplementedHook in your hook struct to avoid defining empty functions e.g. 

type MyHook struct {
  UnimplementedHook
}

func (UnimplementedHook) After 

func (u UnimplementedHook) After(hookContext HookContext, flagEvaluationDetails InterfaceEvaluationDetails, hookHints HookHints) error

func (UnimplementedHook) Before 

func (u UnimplementedHook) Before(hookContext HookContext, hookHints HookHints) (*EvaluationContext, error)

func (UnimplementedHook) Error 

func (u UnimplementedHook) Error(hookContext HookContext, err error, hookHints HookHints)

func (UnimplementedHook) Finally 

func (u UnimplementedHook) Finally(hookContext HookContext, hookHints HookHints)

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