Make proxy_next_upstream_tries configurable (#2232)

* Make proxy_next_upstream_tries configurable

* Code generation

docs/user-guide/annotations.md

@@ -42,6 +42,7 @@ The following annotations are supported:
 |[nginx.ingress.kubernetes.io/proxy-send-timeout](#custom-timeouts)|number|
 |[nginx.ingress.kubernetes.io/proxy-read-timeout](#custom-timeouts)|number|
 |[nginx.ingress.kubernetes.io/proxy-next-upstream](#custom-timeouts)|string|
+|[nginx.ingress.kubernetes.io/proxy-next-upstream-tries](#custom-timeouts)|number|
 |[nginx.ingress.kubernetes.io/proxy-request-buffering](#custom-timeouts)|string|
 |[nginx.ingress.kubernetes.io/proxy-redirect-from](#proxy-redirect)|string|
 |[nginx.ingress.kubernetes.io/proxy-redirect-to](#proxy-redirect)|string|
@@ -405,6 +406,7 @@ In some scenarios is required to have different values. To allow this we provide
 - `nginx.ingress.kubernetes.io/proxy-send-timeout`
 - `nginx.ingress.kubernetes.io/proxy-read-timeout`
 - `nginx.ingress.kubernetes.io/proxy-next-upstream`
+- `nginx.ingress.kubernetes.io/proxy-next-upstream-tries`
 - `nginx.ingress.kubernetes.io/proxy-request-buffering`
 
 ### Proxy redirect

docs/user-guide/configmap.md

@@ -123,6 +123,7 @@ The following table shows a configuration option's name, type, and the default v
 |[proxy-cookie-path](#proxy-cookie-path)|string|"off"|
 |[proxy-cookie-domain](#proxy-cookie-domain)|string|"off"|
 |[proxy-next-upstream](#proxy-next-upstream)|string|"error timeout invalid_header http_502 http_503 http_504"|
+|[proxy-next-upstream-tries](#proxy-next-upstream-tries)|int|0|
 |[proxy-redirect-from](#proxy-redirect-from)|string|"off"|
 |[proxy-request-buffering](#proxy-request-buffering)|string|"on"|
 |[ssl-redirect](#ssl-redirect)|bool|"true"|
@@ -676,6 +677,10 @@ Sets a text that [should be changed in the domain attribute](http://nginx.org/en
 
 Specifies in [which cases](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream) a request should be passed to the next server.
 
+## proxy-next-upstream-tries
+
+Limit the number of [possible tries](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream_tries) a request should be passed to the next server.
+
 ## proxy-redirect-from
 
 Sets the original text that should be changed in the "Location" and "Refresh" header fields of a proxied server response. Default: off.

internal/ingress/annotations/proxy/main.go

@@ -33,6 +33,7 @@ type Config struct {
 	CookieDomain      string `json:"cookieDomain"`
 	CookiePath        string `json:"cookiePath"`
 	NextUpstream      string `json:"nextUpstream"`
+	NextUpstreamTries int    `json:"nextUpstreamTries"`
 	ProxyRedirectFrom string `json:"proxyRedirectFrom"`
 	ProxyRedirectTo   string `json:"proxyRedirectTo"`
 	RequestBuffering  string `json:"requestBuffering"`
@@ -71,6 +72,9 @@ func (l1 *Config) Equal(l2 *Config) bool {
 	if l1.NextUpstream != l2.NextUpstream {
 		return false
 	}
+	if l1.NextUpstreamTries != l2.NextUpstreamTries {
+		return false
+	}
 	if l1.RequestBuffering != l2.RequestBuffering {
 		return false
 	}
@@ -141,6 +145,11 @@ func (a proxy) Parse(ing *extensions.Ingress) (interface{}, error) {
 		nu = defBackend.ProxyNextUpstream
 	}
 
+	nut, err := parser.GetIntAnnotation("proxy-next-upstream-tries", ing)
+	if err != nil {
+		nut = defBackend.ProxyNextUpstreamTries
+	}
+
 	rb, err := parser.GetStringAnnotation("proxy-request-buffering", ing)
 	if err != nil || rb == "" {
 		rb = defBackend.ProxyRequestBuffering
@@ -161,5 +170,5 @@ func (a proxy) Parse(ing *extensions.Ingress) (interface{}, error) {
 		pb = defBackend.ProxyBuffering
 	}
 
-	return &Config{bs, ct, st, rt, bufs, cd, cp, nu, prf, prt, rb, pb}, nil
+	return &Config{bs, ct, st, rt, bufs, cd, cp, nu, nut, prf, prt, rb, pb}, nil
 }

internal/ingress/annotations/proxy/main_test.go

@@ -77,6 +77,7 @@ func (m mockBackend) GetDefaultBackend() defaults.Backend {
 		ProxyBufferSize:        "10k",
 		ProxyBodySize:          "3k",
 		ProxyNextUpstream:      "error",
+		ProxyNextUpstreamTries: 3,
 		ProxyRequestBuffering:  "on",
 		ProxyBuffering:         "off",
 	}
@@ -92,6 +93,7 @@ func TestProxy(t *testing.T) {
 	data[parser.GetAnnotationWithPrefix("proxy-buffer-size")] = "1k"
 	data[parser.GetAnnotationWithPrefix("proxy-body-size")] = "2k"
 	data[parser.GetAnnotationWithPrefix("proxy-next-upstream")] = "off"
+	data[parser.GetAnnotationWithPrefix("proxy-next-upstream-tries")] = "3"
 	data[parser.GetAnnotationWithPrefix("proxy-request-buffering")] = "off"
 	data[parser.GetAnnotationWithPrefix("proxy-buffering")] = "on"
 	ing.SetAnnotations(data)
@@ -122,6 +124,9 @@ func TestProxy(t *testing.T) {
 	if p.NextUpstream != "off" {
 		t.Errorf("expected off as next-upstream but returned %v", p.NextUpstream)
 	}
+	if p.NextUpstreamTries != 3 {
+		t.Errorf("expected 3 as next-upstream-tries but returned %v", p.NextUpstreamTries)
+	}
 	if p.RequestBuffering != "off" {
 		t.Errorf("expected off as request-buffering but returned %v", p.RequestBuffering)
 	}
@@ -162,6 +167,9 @@ func TestProxyWithNoAnnotation(t *testing.T) {
 	if p.NextUpstream != "error" {
 		t.Errorf("expected error as next-upstream but returned %v", p.NextUpstream)
 	}
+	if p.NextUpstreamTries != 3 {
+		t.Errorf("expected 3 as next-upstream-tries but returned %v", p.NextUpstreamTries)
+	}
 	if p.RequestBuffering != "on" {
 		t.Errorf("expected on as request-buffering but returned %v", p.RequestBuffering)
 	}

internal/ingress/controller/config/config.go

@@ -569,6 +569,7 @@ func NewDefault() Configuration {
 			ProxyCookieDomain:      "off",
 			ProxyCookiePath:        "off",
 			ProxyNextUpstream:      "error timeout invalid_header http_502 http_503 http_504",
+			ProxyNextUpstreamTries: 0,
 			ProxyRequestBuffering:  "on",
 			ProxyRedirectFrom:      "off",
 			SSLRedirect:            true,

internal/ingress/controller/controller.go

@@ -852,6 +852,7 @@ func (n *NGINXController) createServers(data []*extensions.Ingress,
 		CookieDomain:      bdef.ProxyCookieDomain,
 		CookiePath:        bdef.ProxyCookiePath,
 		NextUpstream:      bdef.ProxyNextUpstream,
+		NextUpstreamTries: bdef.ProxyNextUpstreamTries,
 		RequestBuffering:  bdef.ProxyRequestBuffering,
 		ProxyRedirectFrom: bdef.ProxyRedirectFrom,
 		ProxyBuffering:    bdef.ProxyBuffering,

internal/ingress/defaults/main.go

@@ -69,6 +69,10 @@ type Backend struct {
 	// http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream
 	ProxyNextUpstream string `json:"proxy-next-upstream"`
 
+	// Limits the number of possible tries for passing a request to the next server.
+	// https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_next_upstream_tries
+	ProxyNextUpstreamTries int `json:"proxy-next-upstream-tries"`
+
 	// Sets the original text that should be changed in the "Location" and "Refresh" header fields of a proxied server response.
 	// http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_redirect
 	// Default: off

rootfs/etc/nginx/template/nginx.tmpl

@@ -949,6 +949,7 @@ stream {
 
             # In case of errors try the next upstream server before returning an error
             proxy_next_upstream                     {{ buildNextUpstream $location.Proxy.NextUpstream $all.Cfg.RetryNonIdempotent }};
+            proxy_next_upstream_tries               {{ $location.Proxy.NextUpstreamTries }};
 
             {{/* rewrite only works if the content is not compressed */}}
             {{ if $location.Rewrite.AddBaseURL }}