Vendor main dependencies.

vendor/github.com/vulcand/oxy/roundrobin/stickysessions.go

@@ -0,0 +1,57 @@
+// package stickysession is a mixin for load balancers that implements layer 7 (http cookie) session affinity
+package roundrobin
+
+import (
+	"net/http"
+	"net/url"
+)
+
+type StickySession struct {
+	cookiename string
+}
+
+func NewStickySession(c string) *StickySession {
+	return &StickySession{c}
+}
+
+// GetBackend returns the backend URL stored in the sticky cookie, iff the backend is still in the valid list of servers.
+func (s *StickySession) GetBackend(req *http.Request, servers []*url.URL) (*url.URL, bool, error) {
+	cookie, err := req.Cookie(s.cookiename)
+	switch err {
+	case nil:
+	case http.ErrNoCookie:
+		return nil, false, nil
+	default:
+		return nil, false, err
+	}
+
+	s_url, err := url.Parse(cookie.Value)
+	if err != nil {
+		return nil, false, err
+	}
+
+	if s.isBackendAlive(s_url, servers) {
+		return s_url, true, nil
+	} else {
+		return nil, false, nil
+	}
+}
+
+func (s *StickySession) StickBackend(backend *url.URL, w *http.ResponseWriter) {
+	c := &http.Cookie{Name: s.cookiename, Value: backend.String()}
+	http.SetCookie(*w, c)
+	return
+}
+
+func (s *StickySession) isBackendAlive(needle *url.URL, haystack []*url.URL) bool {
+	if len(haystack) == 0 {
+		return false
+	}
+
+	for _, s := range haystack {
+		if sameURL(needle, s) {
+			return true
+		}
+	}
+	return false
+}