middleware

package
v1.7.0 Latest Latest
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 Go to latest Published: Mar 24, 2024 License: MIT Imports: 24 Imported by: 1

README

middleware

gin middleware plugin.


Example of use

logging middleware

You can set the maximum length for printing, add a request id field, ignore print path, customize zap log

    r := gin.Default()
	
    r.Use(middleware.Logging())

    r.Use(middleware.Logging(
        middleware.WithMaxLen(400),
        //WithRequestIDFromHeader(),
        WithRequestIDFromContext(),
        //middleware.WithIgnoreRoutes("/hello"),
    ))

    log, _ := logger.Init(logger.WithFormat("json"))
    r.Use(middlewareLogging(
        middleware.WithLog(log),
    ))

Allow cross-domain requests middleware

    r := gin.Default()
    r.Use(middleware.Cors())

rate limiter middleware

Adaptive flow limitation based on hardware resources.

    r := gin.Default()

    // e.g. (1) use default
    // r.Use(RateLimit())
    
    // e.g. (2) custom parameters
    r.Use(RateLimit(
    WithWindow(time.Second*10),
    WithBucket(100),
    WithCPUThreshold(100),
    WithCPUQuota(0.5),
    ))

Circuit Breaker middleware

    r := gin.Default()
    r.Use(CircuitBreaker())

jwt authorization middleware

common authorization
import "github.com/zhufuyi/sponge/pkg/jwt"

func main() {
    r := gin.Default()

    r.POST("/user/login", Login)
    r.GET("/user/:id", middleware.Auth(), h.GetByID) // no verify field
    // r.GET("/user/:id", middleware.Auth(middleware.WithVerify(adminVerify)), h.GetByID) // with verify field

    r.Run(serverAddr)
}

func adminVerify(claims *jwt.Claims, tokenTail10 string, c *gin.Context) error {
    if claims.Name != "admin" {
        return errors.New("verify failed")
    }

    // token := getToken(claims.UID) // from cache or database
    // if tokenTail10 != token[len(token)-10:] { return err }

    return nil
}

func Login(c *gin.Context) {
    // generate token
    token, err := jwt.GenerateToken("123", "admin")
    // save token
}

custom authorization
import "github.com/zhufuyi/sponge/pkg/jwt"

func main() {
    r := gin.Default()

    r.POST("/user/login", Login)
    r.GET("/user/:id", middleware.AuthCustom(verify), h.GetByID)

    r.Run(serverAddr)
}

func verify(claims *jwt.CustomClaims, tokenTail10 string, c *gin.Context) error {
    err := errors.New("verify failed")

    // token, fields := getToken(id) // from cache or database
    // if tokenTail10 != token[len(token)-10:] { return err }
	
    id, exist := claims.Get("id")
    if !exist {
        return err
    }
    foo, exist := claims.Get("foo")
    if !exist {
        return err
    }
    if int(id.(float64)) != fields["id"].(int) ||
        foo.(string) != fields["foo"].(string) {
        return err
    }

    return nil
}

func Login(c *gin.Context) {
    // generate token
    fields := jwt.KV{"id": 123, "foo": "bar"}
    token, err := jwt.GenerateCustomToken(fields)
    // save token end fields
}

tracing middleware

func InitTrace(serviceName string) {
	exporter, err := tracer.NewJaegerAgentExporter("192.168.3.37", "6831")
	if err != nil {
		panic(err)
	}

	resource := tracer.NewResource(
		tracer.WithServiceName(serviceName),
		tracer.WithEnvironment("dev"),
		tracer.WithServiceVersion("demo"),
	)

	tracer.Init(exporter, resource) // collect all by default
}

func NewRouter(
	r := gin.Default()
	r.Use(middleware.Tracing("your-service-name"))

	// ......
)

// if necessary, you can create a span in the program
func SpanDemo(serviceName string, spanName string, ctx context.Context) {
	_, span := otel.Tracer(serviceName).Start(
		ctx, spanName,
		trace.WithAttributes(attribute.String(spanName, time.Now().String())),
	)
	defer span.End()

	// ......
}

Metrics middleware

	r := gin.Default()

	r.Use(metrics.Metrics(r,
		//metrics.WithMetricsPath("/demo/metrics"), // default is /metrics
		metrics.WithIgnoreStatusCodes(http.StatusNotFound), // ignore status codes
		//metrics.WithIgnoreRequestMethods(http.MethodHead),  // ignore request methods
		//metrics.WithIgnoreRequestPaths("/ping", "/health"), // ignore request paths
	))

Request id

    r := gin.Default()
    r.Use(RequestID())

    // Customized request id key
    //r.User(RequestID(
    //    middleware.WithContextRequestIDKey("your ctx request id key"), // default is request_id
    //    middleware.WithHeaderRequestIDKey("your header request id key"), // default is X-Request-Id
    //))
    // If you change the ContextRequestIDKey, you have to set the same key name if you want to print the request id in the mysql logs as well.
    // example: 
    // db, err := mysql.Init(dsn,
        // mysql.WithLogRequestIDKey("your ctx request id key"),  // print request_id
        // ...
    // )

Documentation

Overview

Package middleware is gin middleware plugin.

Index

Constants

View Source 
const (
	// HeaderAuthorizationKey http header authorization key
	HeaderAuthorizationKey = "Authorization"
)

Variables

View Source 
var (
	// ContextRequestIDKey request id for context
	ContextRequestIDKey = "request_id"

	// HeaderXRequestIDKey header request id key
	HeaderXRequestIDKey = "X-Request-Id"
)
View Source 
var ErrLimitExceed = rl.ErrLimitExceed

ErrLimitExceed is returned when the rate limiter is triggered and the request is rejected due to limit exceeded.

View Source 
var ErrNotAllowed = circuitbreaker.ErrNotAllowed

ErrNotAllowed error not allowed.

View Source 
var RequestHeaderKey = "request_header_key"

RequestHeaderKey request header key

View Source 
var RequestIDKey = CtxKeyString(ContextRequestIDKey)

RequestIDKey request_id

Functions

func Auth 

func Auth(opts ...JwtOption) gin.HandlerFunc

Auth authorization

func AuthCustom added in v1.5.4 

func AuthCustom(verify VerifyCustomFn, opts ...JwtOption) gin.HandlerFunc

AuthCustom custom authentication

func CircuitBreaker 

func CircuitBreaker(opts ...CircuitBreakerOption) gin.HandlerFunc

CircuitBreaker a circuit breaker middleware

func Cors 

func Cors() gin.HandlerFunc

Cors cross domain

func CtxRequestID added in v1.2.0 

func CtxRequestID(ctx context.Context) string

CtxRequestID get request id from context.Context

func CtxRequestIDField added in v1.2.0 

func CtxRequestIDField(ctx context.Context) zap.Field

CtxRequestIDField get request id field from context.Context

func GCtxRequestID added in v1.2.0 

func GCtxRequestID(c *gin.Context) string

GCtxRequestID get request id from gin.Context

func GCtxRequestIDField added in v1.2.0 

func GCtxRequestIDField(c *gin.Context) zap.Field

GCtxRequestIDField get request id field from gin.Context

func GetFromCtx added in v1.5.6 

func GetFromCtx(ctx context.Context, key string) interface{}

GetFromCtx get value from context

func GetFromHeader added in v1.5.6 

func GetFromHeader(ctx context.Context, key string) string

GetFromHeader get value from header

func GetFromHeaders added in v1.5.6 

func GetFromHeaders(ctx context.Context, key string) []string

GetFromHeaders get values from header

func HeaderRequestID added in v1.2.0 

func HeaderRequestID(c *gin.Context) string

HeaderRequestID get request id from the header

func HeaderRequestIDField added in v1.2.0 

func HeaderRequestIDField(c *gin.Context) zap.Field

HeaderRequestIDField get request id field from header

func Logging 

func Logging(opts ...Option) gin.HandlerFunc

Logging print request and response info

func RateLimit 

func RateLimit(opts ...RateLimitOption) gin.HandlerFunc

RateLimit an adaptive rate limiter middleware

func RequestID 

func RequestID(opts ...RequestIDOption) gin.HandlerFunc

RequestID is an interceptor that injects a 'request id' into the context and request/response header of each request.

func Tracing 

func Tracing(serviceName string, opts ...TraceOption) gin.HandlerFunc

Tracing returns interceptor that will trace incoming requests. The service parameter should describe the name of the (virtual) server handling the request.

func WrapCtx added in v1.5.6 

func WrapCtx(c *gin.Context) context.Context

WrapCtx wrap context, put the Keys and Header of gin.Context into context

Types

type CircuitBreakerOption 

type CircuitBreakerOption func(*circuitBreakerOptions)

CircuitBreakerOption set the circuit breaker circuitBreakerOptions.

func WithGroup 

func WithGroup(g *group.Group) CircuitBreakerOption

WithGroup with circuit breaker group. NOTE: implements generics circuitbreaker.CircuitBreaker

func WithValidCode added in v1.4.2 

func WithValidCode(code ...int) CircuitBreakerOption

WithValidCode http code to mark failed

type CtxKeyString added in v1.5.3 

type CtxKeyString string

CtxKeyString for context.WithValue key type

type JwtOption added in v1.5.4 

type JwtOption func(*jwtOptions)

JwtOption set the jwt options.

func WithSwitchHTTPCode added in v1.5.4 

func WithSwitchHTTPCode() JwtOption

WithSwitchHTTPCode switch to http code

func WithVerify added in v1.5.4 

func WithVerify(verify VerifyFn) JwtOption

WithVerify set verify function

type Option 

type Option func(*options)

Option set the gin logger options.

func WithIgnoreRoutes 

func WithIgnoreRoutes(routes ...string) Option

WithIgnoreRoutes no logger content routes

func WithLog 

func WithLog(log *zap.Logger) Option

WithLog set log

func WithMaxLen 

func WithMaxLen(maxLen int) Option

WithMaxLen logger content max length

func WithRequestIDFromContext 

func WithRequestIDFromContext() Option

WithRequestIDFromContext name is field in context, default value is request_id

func WithRequestIDFromHeader 

func WithRequestIDFromHeader() Option

WithRequestIDFromHeader name is field in header, default value is X-Request-Id

type RateLimitOption 

type RateLimitOption func(*rateLimitOptions)

RateLimitOption set the rate limits rateLimitOptions.

func WithBucket 

func WithBucket(b int) RateLimitOption

WithBucket with bucket size.

func WithCPUQuota 

func WithCPUQuota(quota float64) RateLimitOption

WithCPUQuota with real cpu quota(if it can not collect from process correct);

func WithCPUThreshold 

func WithCPUThreshold(threshold int64) RateLimitOption

WithCPUThreshold with cpu threshold

func WithWindow 

func WithWindow(d time.Duration) RateLimitOption

WithWindow with window size.

type RequestIDOption added in v1.5.6 

type RequestIDOption func(*requestIDOptions)

RequestIDOption set the request id options.

func WithContextRequestIDKey added in v1.5.6 

func WithContextRequestIDKey(key string) RequestIDOption

WithContextRequestIDKey set context request id key, minimum length of 4

func WithHeaderRequestIDKey added in v1.5.6 

func WithHeaderRequestIDKey(key string) RequestIDOption

WithHeaderRequestIDKey set header request id key, minimum length of 4

type TraceOption 

type TraceOption func(*traceConfig)

TraceOption specifies instrumentation configuration options.

func WithPropagators 

func WithPropagators(propagators propagation.TextMapPropagator) TraceOption

WithPropagators specifies propagators to use for extracting information from the HTTP requests. If none are specified, global ones will be used.

func WithTracerProvider 

func WithTracerProvider(provider oteltrace.TracerProvider) TraceOption

WithTracerProvider specifies a tracer provider to use for creating a tracer. If none is specified, the global provider is used.

type VerifyCustomFn added in v1.5.4 

type VerifyCustomFn func(claims *jwt.CustomClaims, tokenTail10 string, c *gin.Context) error

VerifyCustomFn verify custom function, tokenTail10 is a string that intercepts the last 10 characters of the token.

type VerifyFn added in v1.5.4 

type VerifyFn func(claims *jwt.Claims, tokenTail10 string, c *gin.Context) error

VerifyFn verify function, tokenTail10 is a string that intercepts the last 10 characters of the token.

Source Files

View all Source files

Directories

Path Synopsis
Package metrics is gin metrics library, collect five metrics, "uptime", "http_request_count_total", "http_request_duration_seconds", "http_request_size_bytes", "http_response_size_bytes".
 Package metrics is gin metrics library, collect five metrics, "uptime", "http_request_count_total", "http_request_duration_seconds", "http_request_size_bytes", "http_response_size_bytes".

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