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gin_middlewares.go
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/
gin_middlewares.go
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// This is middleware we're using for the entire server.
package server
import (
"context"
"fmt"
"strconv"
"strings"
"time"
"github.com/fnproject/fn/api"
"github.com/fnproject/fn/api/common"
"github.com/gin-contrib/cors"
"github.com/gin-gonic/gin"
"github.com/sirupsen/logrus"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
"go.opencensus.io/tag"
"go.opencensus.io/trace"
)
var (
pathKey = common.MakeKey("path")
methodKey = common.MakeKey("method")
statusKey = common.MakeKey("status")
whodunitKey = common.MakeKey("blame")
apiRequestCountMeasure = common.MakeMeasure("api/request_count", "Count of API requests started", stats.UnitDimensionless)
apiResponseCountMeasure = common.MakeMeasure("api/response_count", "API response count", stats.UnitDimensionless)
apiLatencyMeasure = common.MakeMeasure("api/latency", "Latency distribution of API requests", stats.UnitMilliseconds)
APIViewsGetPath = DefaultAPIViewsGetPath
)
func optionalCorsWrap(r *gin.Engine) {
// By default no CORS are allowed unless one
// or more Origins are defined by the API_CORS
// environment variable.
corsStr := getEnv(EnvAPICORSOrigins, "")
if len(corsStr) > 0 {
origins := strings.Split(strings.Replace(corsStr, " ", "", -1), ",")
corsConfig := cors.DefaultConfig()
if origins[0] == "*" {
corsConfig.AllowAllOrigins = true
} else {
corsConfig.AllowOrigins = origins
}
corsHeaders := getEnv(EnvAPICORSHeaders, "")
if len(corsHeaders) > 0 {
headers := strings.Split(strings.Replace(corsHeaders, " ", "", -1), ",")
corsConfig.AllowHeaders = headers
}
corsConfig.AllowMethods = []string{"GET", "POST", "PUT", "HEAD", "DELETE"}
logrus.Infof("CORS enabled for domains: %s", origins)
r.Use(cors.New(corsConfig))
}
}
// we should use http grr
func traceWrap(c *gin.Context) {
appIDKey, err := tag.NewKey("fn.app_id")
if err != nil {
logrus.Fatal(err)
}
fnKey, err := tag.NewKey("fn.fn_id")
if err != nil {
logrus.Fatal(err)
}
ctx, err := tag.New(c.Request.Context(),
tag.Insert(appIDKey, c.Param(api.AppID)),
tag.Insert(fnKey, c.Param(api.FnID)),
)
if err != nil {
logrus.Fatal(err)
}
// TODO inspect opencensus more and see if we need to define a header ourselves
// to trigger per-request spans (we will want this), we can set sampler here per request.
ctx, span := trace.StartSpan(ctx, "serve_http")
defer span.End()
// spans like these, not tags
span.AddAttributes(
trace.StringAttribute("fn.app_id", c.Param(api.AppID)),
trace.StringAttribute("fn.fn_id", c.Param(api.FnID)),
)
c.Request = c.Request.WithContext(ctx)
c.Next()
}
func RegisterAPIViews(tagKeys []string, dist []float64) {
// default tags for request and response
reqTags := []tag.Key{pathKey, methodKey}
respTags := []tag.Key{pathKey, methodKey, statusKey, whodunitKey}
// add extra tags if not already in default tags for req/resp
for _, key := range tagKeys {
if key != pathKey.Name() && key != methodKey.Name() && key != statusKey.Name() && key != whodunitKey.Name() {
respTags = append(respTags, common.MakeKey(key))
}
if key != pathKey.Name() && key != methodKey.Name() {
reqTags = append(reqTags, common.MakeKey(key))
}
}
err := view.Register(
common.CreateViewWithTags(apiRequestCountMeasure, view.Count(), reqTags),
common.CreateViewWithTags(apiResponseCountMeasure, view.Count(), respTags),
common.CreateViewWithTags(apiLatencyMeasure, view.Distribution(dist...), respTags),
)
if err != nil {
logrus.WithError(err).Fatal("cannot register view")
}
}
func DefaultAPIViewsGetPath(routes gin.RoutesInfo, c *gin.Context) string {
// get the handler url, example: /v2/apps/:app
url := "invalid"
for _, r := range routes {
if r.Handler == c.HandlerName() {
url = r.Path
break
}
}
return url
}
func apiMetricsWrap(s *Server) {
measure := func(engine *gin.Engine) func(*gin.Context) {
var routes gin.RoutesInfo
return func(c *gin.Context) {
if routes == nil {
routes = engine.Routes()
}
start := time.Now()
ctx, err := tag.New(c.Request.Context(),
tag.Upsert(pathKey, APIViewsGetPath(routes, c)),
tag.Upsert(methodKey, c.Request.Method),
)
if err != nil {
logrus.Fatal(err)
}
stats.Record(ctx, apiRequestCountMeasure.M(0))
c.Next()
status := strconv.Itoa(c.Writer.Status())
ctx, err = tag.New(c.Request.Context(), // important, request context could be mutated by now
tag.Upsert(pathKey, APIViewsGetPath(routes, c)),
tag.Upsert(methodKey, c.Request.Method),
tag.Upsert(statusKey, status),
tag.Insert(whodunitKey, "service"), // only insert this if it doesn't exist
)
if err != nil {
logrus.Fatal(err)
}
stats.Record(ctx, apiResponseCountMeasure.M(0))
stats.Record(ctx, apiLatencyMeasure.M(int64(time.Since(start)/time.Millisecond)))
}
}
r := s.Router
r.Use(measure(r))
if s.svcConfigs[WebServer].Addr != s.svcConfigs[AdminServer].Addr {
a := s.AdminRouter
a.Use(measure(a))
}
}
func panicWrap(c *gin.Context) {
defer func(c *gin.Context) {
if rec := recover(); rec != nil {
err, ok := rec.(error)
if !ok {
err = fmt.Errorf("fn: %v", rec)
}
handleErrorResponse(c, err)
c.Abort()
}
}(c)
c.Next()
}
func loggerWrap(c *gin.Context) {
ctx, _ := common.LoggerWithFields(c.Request.Context(), extractFields(c))
if appID := c.Param(api.AppID); appID != "" {
c.Set(api.AppID, appID)
ctx = ContextWithAppID(ctx, appID)
}
if fnID := c.Param(api.FnID); fnID != "" {
c.Set(api.FnID, fnID)
ctx = ContextWithFnID(ctx, fnID)
}
c.Request = c.Request.WithContext(ctx)
c.Next()
}
type ctxFnIDKey string
func ContextWithFnID(ctx context.Context, fnID string) context.Context {
return context.WithValue(ctx, ctxFnIDKey(api.FnID), fnID)
}
// FnIDFromContext returns the app from a context, if set.
func FnIDFromContext(ctx context.Context) string {
r, _ := ctx.Value(ctxFnIDKey(api.FnID)).(string)
return r
}
type ctxAppIDKey string
func ContextWithAppID(ctx context.Context, appID string) context.Context {
return context.WithValue(ctx, ctxAppIDKey(api.AppID), appID)
}
// AppIDFromContext returns the app from a context, if set.
func AppIDFromContext(ctx context.Context) string {
r, _ := ctx.Value(ctxAppIDKey(api.AppID)).(string)
return r
}