add AlreadyHaveResult function

api.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"fmt"
 	"reflect"
 
 	"github.com/gin-gonic/gin"
@@ -12,7 +13,7 @@ import (
 var (
 	validate              = validator.New()
 	requestLogidGetter    = defaultLogidGetter
-	requestHandlerMapper  = map[string]Handler{}
+	requestHandlerMapper  = map[string]gin.HandlerFunc{}
 	errCodeUnknownError   = -10000
 	errCodeParameterError = -20000
 	errCodeUnimplementApi = -20401
@@ -37,9 +38,12 @@ type BaseWithErrCodeOutput struct {
 	ErrMsg  string `json:"errMsg"`
 }
 
-func NewEngine() *Engine {
+func NewEngine(pre ...gin.HandlerFunc) *Engine {
 	gin.SetMode(gin.ReleaseMode)
 	e := gin.New()
+	for _, m := range pre {
+		e.Use(m)
+	}
 	e.Use(middlewareMyApiEngine())
 	return &Engine{e}
 }
@@ -50,10 +54,16 @@ func (e *Engine) POST(uri string, handler Handler) {
 	e.Engine.POST(uri, h)
 }
 
+func (e *Engine) GET(uri string, handler Handler) {
+	h := handlerWrapper(handler)
+	log.Infof("api handler [%v] registor success", handler)
+	e.Engine.GET(uri, h)
+}
+
 // handlerWrapper
 func handlerWrapper(handler Handler) gin.HandlerFunc {
 	handlerFunc := handler.HandlerFunc()
-	return func(c *gin.Context) {
+	wrappedHandlerFunc := func(c *gin.Context) {
 		// Case 1. get request handler
 		if c.Request == nil && c.Keys != nil {
 			c.Keys["handler"] = handler
@@ -75,6 +85,9 @@ func handlerWrapper(handler Handler) gin.HandlerFunc {
 			return
 		}
 	}
+	hkey := fmt.Sprintf("%v", wrappedHandlerFunc)
+	requestHandlerMapper[hkey] = wrappedHandlerFunc
+	return wrappedHandlerFunc
 }
 
 // handlerWrapper
@@ -112,8 +125,8 @@ func middlewareMyApiEngine() gin.HandlerFunc {
 		// Step 3. do request
 		c.Next()
 
-		// Step 4. metrics record
-		cc.recordMetric()
+		// Step 4. recorde metrics
+		cc.recordMetrics()
 	}
 }
 
@@ -141,8 +154,17 @@ func CC(c *gin.Context) *Context {
 }
 
 func ApiHandler(c *gin.Context) Handler {
-	newc := &gin.Context{Request: nil, Keys: map[string]any{}}
-	c.Handler()(newc)
+	h := c.Handler()
+	hkey := fmt.Sprintf("%v", h)
+	if _, ok := requestHandlerMapper[hkey]; !ok {
+		return nil
+	}
+
+	newc := &gin.Context{
+		Request: nil,
+		Keys:    map[string]any{},
+	}
+	h(newc)
 	return newc.Keys["handler"].(Handler)
 }
 
@@ -157,7 +179,7 @@ func RecordMetrics(api, errcode, appid string, costms float64) {
 	summary.Observe(costms)
 }
 
-func DumpHandler(c *Context) error {
+func DumpHandlerFunc(c *Context) error {
 	errmsg := "api not implemented"
 	errcode := errCodeUnimplementApi
 	return c.RESULT_ERROR(errcode, errmsg)

context.go

@@ -120,7 +120,14 @@ func (c *Context) SetCookie(cookie *http.Cookie) {
 	http.SetCookie(c.Writer, cookie)
 }
 
+func (c *Context) AlreadyHaveResult() (done bool, entry string) {
+	return c.resultentry != "", c.resultentry
+}
+
 func (c *Context) RESULT(output interface{}) error {
+	if c.resultentry == "" {
+		c.resultentry = "RESULT"
+	}
 	var t = reflect.TypeOf(output)
 	defer func(o *interface{}) {
 		b, err := json.Marshal(o)
@@ -212,13 +219,16 @@ func (c *Context) shapeOutput(o interface{}) {
 	return
 }
 
-func (c *Context) recordMetric() {
+func (c *Context) recordMetrics() {
 	if metricApiCounter == nil ||
 		metricApiSummary == nil {
 		return
 	}
+	var h = c.ApiHandler()
+	if h == nil {
+		h = unimplementHandler{c.Context}
+	}
 	var (
-		h       = c.ApiHandler()
 		api     = h.ApiName()
 		appid   = c.AppId
 		costus  = time.Now().Sub(c.starttime).Microseconds()

prometheus.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
+	"strings"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -14,9 +15,10 @@ import (
 var (
 	MetricExporterPusher                         = func() error { return nil }
 	MetricExporterHandler Handler                = nil
-	metricRegistry        *prometheus.Registry   = nil
+	MetricRegistry        *prometheus.Registry   = nil
 	metricApiCounter      *prometheus.CounterVec = nil
 	metricApiSummary      *prometheus.SummaryVec = nil
+	instance              string                 = "--unknown--"
 )
 
 type metricExporterHandler struct {
@@ -39,14 +41,20 @@ func dumpMetricExporterPusher() error {
 	return errors.New("not initilized, forgot call 'SetupMetricsExporterPusher'?")
 }
 
-func InitMetrics() {
-	instance := getInstanceIpAddress()
-	log.Infof("self instance ip: [%s]", instance)
+func InitMetrics(instanceValue string) {
+	if instanceValue == "" {
+		instance = getInstanceIpAddress()
+	} else if ap := strings.Split(instanceValue, ":"); len(ap) == 2 &&
+		ap[0] == "0.0.0.0" || ap[0] == "" {
+		instance = getInstanceIpAddress() + ":" + ap[1]
+	}
+	log.Infof("self instance: [%s]", instance)
+
 	metricApiCounter = prometheus.NewCounterVec(
 		prometheus.CounterOpts{
 			Name: "api_requests_total",
 			Help: "How many HTTP requests processed",
-			ConstLabels: prometheus.Labels{"instance": instance},
+			//ConstLabels: prometheus.Labels{"instance": instance},
 		},
 		[]string{"api", "errcode", "appid"},
 	)
@@ -55,13 +63,14 @@ func InitMetrics() {
 			Name:       "api_requests_summary",
 			Help:       "The api request summary of cost.",
 			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
-			ConstLabels: prometheus.Labels{"instance": instance},
+			//ConstLabels: prometheus.Labels{"instance": instance},
 		},
 		[]string{"api", "errcode", "appid"},
 	)
-	metricRegistry = prometheus.NewRegistry()
-	metricRegistry.MustRegister(metricApiCounter)
-	metricRegistry.MustRegister(metricApiSummary)
+
+	MetricRegistry = prometheus.NewRegistry()
+	MetricRegistry.MustRegister(metricApiCounter)
+	MetricRegistry.MustRegister(metricApiSummary)
 }
 
 func SetupMetricsExporterHandler(apiname string) {
@@ -69,10 +78,10 @@ func SetupMetricsExporterHandler(apiname string) {
 		apiname = "premetheus_metrics_exporter"
 	}
 
-	opt := promhttp.HandlerOpts{Registry: metricRegistry}
+	opt := promhttp.HandlerOpts{Registry: MetricRegistry}
 	MetricExporterHandler = &metricExporterHandler{
 		name:            apiname,
-		promhttpHandler: promhttp.HandlerFor(metricRegistry, opt),
+		promhttpHandler: promhttp.HandlerFor(MetricRegistry, opt),
 	}
 }
 
@@ -81,7 +90,11 @@ func SetupMetricsExporterPusher(pushgateway string, jobname string) {
 		jobname = fmt.Sprintf("api-metrics-job-%s", getExeFilename())
 	}
 
-	var pusher = push.New(pushgateway, jobname).Gatherer(metricRegistry)
+	var pusher = push.
+		New(pushgateway, jobname).
+		Grouping("instance", instance).
+		Gatherer(MetricRegistry)
+
 	MetricExporterPusher = func() error {
 		RecordMetrics("push_metrics_to_prometheus", "0", "selfmonitoring", 1.0)
 		return pusher.Push()

routes.go

@@ -1,5 +1,12 @@
 package api
 
+import (
+	"fmt"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
 // ///////////////////////////////////////////////////////////////////
 // IRouter & IRoutes in gin, we redefine it simple
 // ///////////////////////////////////////////////////////////////////
@@ -40,5 +47,19 @@ type Handler interface {
 type HandlerFunc func(*Context) error
 
 type IRoutes interface {
+	GET(uri string, handler Handler)
 	POST(uri string, handler Handler)
 }
+
+type unimplementHandler struct {
+	c *gin.Context
+}
+
+func (u unimplementHandler) ApiName() string {
+	req := u.c.Request
+	return strings.ToLower(fmt.Sprintf("[%s]%s", req.Method, req.RequestURI))
+}
+
+func (u unimplementHandler) HandlerFunc() HandlerFunc {
+	return DumpHandlerFunc
+}