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server_options.go
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server_options.go
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package server
import (
"context"
"fmt"
"net/http"
"github.com/fnproject/fn/api/common"
"github.com/gin-gonic/gin"
"github.com/sirupsen/logrus"
)
// Option is a func that allows configuring a Server
type Option func(context.Context, *Server) error
// RIDProvider is used to generate request IDs
type RIDProvider struct {
HeaderName string // The name of the header where the reques id is stored in the incoming request
RIDGenerator func(string) string // Function to generate the requestID
}
// WithRIDProvider will generate request ids for each http request using the
// given generator.
func WithRIDProvider(ridProvider *RIDProvider) Option {
return func(ctx context.Context, s *Server) error {
s.Router.Use(withRIDProvider(ridProvider))
return nil
}
}
func withRIDProvider(ridp *RIDProvider) func(c *gin.Context) {
return func(c *gin.Context) {
rid := ridp.RIDGenerator(c.Request.Header.Get(ridp.HeaderName))
ctx := common.WithRequestID(c.Request.Context(), rid)
// We set the rid in the common logger so it is always logged when the common logger is used
l := common.Logger(ctx).WithFields(logrus.Fields{common.RequestIDContextKey: rid})
ctx = common.WithLogger(ctx, l)
c.Request = c.Request.WithContext(ctx)
c.Next()
}
}
// EnableShutdownEndpoint adds /shutdown to initiate a shutdown of an fn server.
func EnableShutdownEndpoint(ctx context.Context, halt context.CancelFunc) Option {
return func(ctx context.Context, s *Server) error {
s.Router.GET("/shutdown", s.handleShutdown(halt))
return nil
}
}
// LimitRequestBody wraps every http request to limit its size to the specified max bytes.
func LimitRequestBody(max int64) Option {
return func(ctx context.Context, s *Server) error {
if max > 0 {
s.Router.Use(limitRequestBody(max))
}
return nil
}
}
func limitRequestBody(max int64) func(c *gin.Context) {
return func(c *gin.Context) {
cl := int64(c.Request.ContentLength)
if cl > max {
// try to deny this quickly, instead of just letting it get lopped off
handleErrorResponse(c, errTooBig{cl, max})
c.Abort()
return
}
// if no Content-Length specified, limit how many bytes we read and error
// if we hit the max (intercontinental anti-air missile defense system).
// read http.MaxBytesReader for gritty details..
c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, max)
c.Next()
}
}
// models.APIError
type errTooBig struct {
n, max int64
}
func (e errTooBig) Code() int { return http.StatusRequestEntityTooLarge }
func (e errTooBig) Error() string {
return fmt.Sprintf("Content-Length too large for this server, %d > max %d", e.n, e.max)
}