Merge pull request 'add ratelimit to ingress' (#1) from feature/ingress-ratelimit into master

Reviewed-on: #1

src/main/cljc/dda/c4k_common/ingress.cljc

@@ -1,11 +1,9 @@
 (ns dda.c4k-common.ingress
   (:require
    [clojure.spec.alpha :as s]
-   #?(:cljs [shadow.resource :as rc])
    #?(:clj [orchestra.core :refer [defn-spec]]
       :cljs [orchestra.core :refer-macros [defn-spec]])
-   #?(:clj [clojure.edn :as edn]
+   #?(:cljs [dda.c4k-common.macros :refer-macros [inline-resources]])
-      :cljs [cljs.reader :as edn])
    [dda.c4k-common.yaml :as yaml]
    [dda.c4k-common.common :as cm]
    [dda.c4k-common.predicate :as pred]))
@@ -17,26 +15,28 @@
 (s/def ::cert-name string?)
 (s/def ::service-port pos-int?)
 (s/def ::fqdns (s/coll-of pred/fqdn-string?))
+(s/def ::average-rate pos-int?)
+(s/def ::burst-rate pos-int?)
 
 (def simple-ingress? (s/keys :req-un [::fqdns ::service-name ::service-port]
-                             :opt-un [::issuer]))
+                             :opt-un [::issuer ::average-rate]))
 
 (def ingress? (s/keys :req-un [::fqdns ::app-name ::ingress-name ::service-name ::service-port]
-                      :opt-un [::issuer ::cert-name]))
+                      :opt-un [::issuer ::cert-name ::rate-limit-name]))
 
 (def certificate? (s/keys :req-un [::fqdns ::app-name ::cert-name]
                           :opt-un [::issuer]))
 
-; TODO: use this default consistently
+(def rate-limit-config? (s/keys :req-un [::rate-limit-name
-(def ingress-defaults {:issuer "staging"})
+                                         ::average-rate
+                                         ::burst-rate]))
+
+(def simple-ingress-defaults {:issuer "staging"
+                              :average-rate 10})
 
 #?(:cljs
    (defmethod yaml/load-resource :ingress [resource-name]
-     (case resource-name
+     (get (inline-resources "ingress") resource-name)))
-       "ingress/host-rule.yaml" (rc/inline "ingress/host-rule.yaml")
-       "ingress/certificate.yaml" (rc/inline "ingress/certificate.yaml")
-       "ingress/ingress.yaml" (rc/inline "ingress/ingress.yaml")
-       (throw (js/Error. "Undefined Resource!")))))
 
 (defn-spec generate-host-rule  pred/map-or-seq?
   [service-name ::service-name
@@ -48,16 +48,14 @@
    (cm/replace-all-matching-values-by-new-value "SERVICE_PORT" service-port)
    (cm/replace-all-matching-values-by-new-value "SERVICE_NAME" service-name)))
 
-(defn-spec generate-ingress pred/map-or-seq?
+(defn-spec generate-rate-limit-middleware pred/map-or-seq?
-  [config ingress?]
+  [config rate-limit-config?]
-  (let [{:keys [ingress-name cert-name service-name service-port fqdns app-name]} config]
+  (let [{:keys [rate-limit-name average-rate burst-rate]} config]
     (->
-     (yaml/load-as-edn "ingress/ingress.yaml")
+     (yaml/load-as-edn "ingress/middleware-ratelimit.yaml")
-     (assoc-in [:metadata :name] ingress-name)
+     (assoc-in [:metadata :name] (str rate-limit-name "-ratelimit"))
-     (assoc-in [:metadata :labels :app.kubernetes.part-of] app-name)
+     (assoc-in [:spec :rateLimit :average] average-rate)
-     (assoc-in [:spec :tls 0 :secretName] cert-name)
+     (assoc-in [:spec :rateLimit :burst] burst-rate))))
-     (assoc-in [:spec :tls 0 :hosts] fqdns)
-     (assoc-in [:spec :rules] (mapv (partial generate-host-rule service-name service-port) fqdns)))))
 
 (defn-spec generate-certificate pred/map-or-seq?
   [config certificate?]
@@ -73,13 +71,49 @@
      (assoc-in [:spec :dnsNames] fqdns)
      (assoc-in [:spec :issuerRef :name] letsencrypt-issuer))))
 
+(defn-spec generate-ingress pred/map-or-seq?
+  [config ingress?]
+  (let [{:keys [ingress-name cert-name service-name service-port fqdns app-name rate-limit-name]} config]
+    (->
+     (yaml/load-as-edn "ingress/ingress.yaml")
+     (assoc-in [:metadata :name] ingress-name)
+     (assoc-in [:metadata :labels :app.kubernetes.part-of] app-name)
+     (assoc-in [:metadata :annotations] 
+               {:traefik.ingress.kubernetes.io/router.entrypoints 
+                "web, websecure"
+                :traefik.ingress.kubernetes.io/router.middlewares 
+                (if rate-limit-name
+                  (str "default-redirect-https@kubernetescrd, " rate-limit-name "-ratelimit@kubernetescrd")
+                  "default-redirect-https@kubernetescrd")
+                :metallb.universe.tf/address-pool "public"})
+     (assoc-in [:spec :tls 0 :secretName] cert-name)
+     (assoc-in [:spec :tls 0 :hosts] fqdns)
+     (assoc-in [:spec :rules] 
+               (mapv (partial generate-host-rule service-name service-port) fqdns)))))
+
 (defn-spec generate-ingress-and-cert any?
   [simple-ingress-config simple-ingress?]
   (let [{:keys [service-name]} simple-ingress-config
         config (merge {:app-name service-name
                        :ingress-name service-name
                        :cert-name service-name}
-                      ingress-defaults
+                      simple-ingress-defaults
                       simple-ingress-config)]
     [(generate-certificate config)
      (generate-ingress config)]))
+
+(defn-spec generate-simple-ingress any?
+  [simple-ingress-config simple-ingress?]
+  (let [{:keys [service-name]} simple-ingress-config
+        config (merge {:app-name service-name
+                       :ingress-name service-name
+                       :cert-name service-name
+                       :rate-limit-name service-name}
+                      simple-ingress-defaults
+                      simple-ingress-config)
+        {:keys [average-rate]} config]
+    [(generate-certificate config)
+     (generate-rate-limit-middleware {:rate-limit-name service-name
+                                      :average-rate average-rate 
+                                      :burst-rate average-rate})
+     (generate-ingress config)]))

src/main/resources/ingress/ingress.yaml

@@ -1,10 +1,7 @@
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
-  name: c4k-common-https-ingress
   namespace: default
-  labels:
-    app.kubernetes.part-of: c4k-common-app
   annotations:
     traefik.ingress.kubernetes.io/router.entrypoints: web, websecure
     traefik.ingress.kubernetes.io/router.middlewares: default-redirect-https@kubernetescrd

src/main/resources/ingress/middleware-ratelimit.yaml

@@ -0,0 +1,8 @@
+apiVersion: traefik.containo.us/v1alpha1
+kind: Middleware
+metadata:
+  name: ratelimit
+spec:
+  rateLimit:
+    average: AVG
+    burst: BRS

src/test/clj/dda/c4k_common/macros_test.clj

@@ -4,7 +4,7 @@
    [dda.c4k-common.macros :refer [inline-resources]]))
 
 (deftest should-count-inline-resources
-  (is (= 3 (count (inline-resources "ingress")))))
+  (is (= 4 (count (inline-resources "ingress")))))
 
 (deftest should-inline-resources
   (let [resource-path (fn [name] (str "dda/c4k_common/inline_resources_test/" name))]

src/test/cljc/dda/c4k_common/ingress_test.cljc

@@ -20,12 +20,39 @@
              {:service {:name "myservice", :port {:number 3000}}}}]}}
          (cut/generate-host-rule "myservice" 3000 "test.com"))))
 
+(deftest should-generate-certificate
+  (is (= {:apiVersion "cert-manager.io/v1",
+          :kind "Certificate",
+          :metadata {:name "test-io-cert",
+                     :namespace "default",
+                     :labels {:app.kubernetes.part-of "c4k-common-app"}},
+          :spec
+          {:secretName "test-io-cert",
+           :commonName "test.de",
+           :duration "2160h",
+           :renewBefore "720h",
+           :dnsNames ["test.de" "test.org" "www.test.de" "www.test.org"],
+           :issuerRef {:name "prod", :kind "ClusterIssuer"}}}
+         (cut/generate-certificate {:fqdns ["test.de" "test.org" "www.test.de" "www.test.org"]
+                                    :app-name "c4k-common-app"
+                                    :cert-name "test-io-cert"
+                                    :issuer "prod"}))))
+
+(deftest should-generate-middleware-ratelimit
+  (is (= {:apiVersion "traefik.containo.us/v1alpha1",
+          :kind "Middleware",
+          :metadata {:name "normal-ratelimit"},
+          :spec {:rateLimit {:average 10, :burst 5}}}
+         (cut/generate-rate-limit-middleware {:rate-limit-name "normal"
+                                              :average-rate 10, :burst-rate 5}))))
+
 (deftest should-generate-ingress
   (is (= {:apiVersion "networking.k8s.io/v1",
           :kind "Ingress",
           :metadata
-          {:name "test-io-https-ingress",
+          {
            :namespace "default",
+           :name "test-io-https-ingress",
            :labels {:app.kubernetes.part-of "c4k-common-app"},
            :annotations {:traefik.ingress.kubernetes.io/router.entrypoints
                          "web, websecure"
@@ -40,6 +67,22 @@
                   :ingress-name "test-io-https-ingress"
                   :fqdns ["test.de" "www.test.de" "test-it.de"
                           "www.test-it.de"]}) :spec)))
+  (is (= {
+          :name "test-io-https-ingress",
+          :namespace "default",
+          :labels {:app.kubernetes.part-of "c4k-common-app"},
+          :annotations {:traefik.ingress.kubernetes.io/router.entrypoints
+                        "web, websecure"
+                        :traefik.ingress.kubernetes.io/router.middlewares
+                        "default-redirect-https@kubernetescrd, normal-ratelimit@kubernetescrd",
+                        :metallb.universe.tf/address-pool "public"}}
+         (:metadata (cut/generate-ingress
+                     {:service-name "test-io-service"
+                      :app-name "c4k-common-app"
+                      :service-port 80
+                      :ingress-name "test-io-https-ingress"
+                      :rate-limit-name "normal"
+                      :fqdns ["test.de"]}))))
   (is (= {:tls
           [{:hosts
             ["test.de" "www.test.de" "test-it.de" "www.test-it.de"],
@@ -66,25 +109,6 @@
                                        :fqdns ["test.de" "www.test.de"
                                                "test-it.de"
                                                "www.test-it.de"]})))))
-
-(deftest should-generate-certificate
-  (is (= {:apiVersion "cert-manager.io/v1",
-          :kind "Certificate",
-          :metadata {:name "test-io-cert",
-                     :namespace "default",
-                     :labels {:app.kubernetes.part-of "c4k-common-app"}},
-          :spec
-          {:secretName "test-io-cert",
-           :commonName "test.de",
-           :duration "2160h",
-           :renewBefore "720h",
-           :dnsNames ["test.de" "test.org" "www.test.de" "www.test.org"],
-           :issuerRef {:name "prod", :kind "ClusterIssuer"}}}
-         (cut/generate-certificate {:fqdns ["test.de" "test.org" "www.test.de" "www.test.org"]
-                                    :app-name "c4k-common-app"
-                                    :cert-name "test-io-cert"
-                                    :issuer "prod"}))))
-
 (deftest should-generate-ingress-and-cert
   (is (= [{:apiVersion "cert-manager.io/v1",
            :kind "Certificate",
@@ -122,3 +146,45 @@
          (cut/generate-ingress-and-cert {:fqdns ["test.jit.si"]
                                           :service-name "web"
                                           :service-port 80}))))
+
+(deftest should-generate-simple-ingress
+  (is (= [{:apiVersion "cert-manager.io/v1",
+           :kind "Certificate",
+           :metadata
+           {:name "web",
+            :labels {:app.kubernetes.part-of "web"},
+            :namespace "default"},
+           :spec
+           {:secretName "web",
+            :commonName "test.jit.si",
+            :duration "2160h",
+            :renewBefore "720h",
+            :dnsNames ["test.jit.si"],
+            :issuerRef {:name "staging", :kind "ClusterIssuer"}}}
+          {:apiVersion "traefik.containo.us/v1alpha1",
+           :kind "Middleware",
+           :metadata {:name "web-ratelimit"},
+           :spec {:rateLimit {:average 10, :burst 10}}}
+          {:apiVersion "networking.k8s.io/v1",
+           :kind "Ingress",
+           :metadata
+           {:name "web",
+            :namespace "default",
+            :labels {:app.kubernetes.part-of "web"},
+            :annotations
+            {:traefik.ingress.kubernetes.io/router.entrypoints "web, websecure",
+             :traefik.ingress.kubernetes.io/router.middlewares
+             "default-redirect-https@kubernetescrd, web-ratelimit@kubernetescrd",
+             :metallb.universe.tf/address-pool "public"}},
+           :spec
+           {:tls [{:hosts ["test.jit.si"], :secretName "web"}],
+            :rules
+            [{:host "test.jit.si",
+              :http {:paths [{:path "/",
+                              :pathType "Prefix",
+                              :backend
+                              {:service {:name "web",
+                                         :port {:number 80}}}}]}}]}}]
+         (cut/generate-simple-ingress {:fqdns ["test.jit.si"]
+                                       :service-name "web"
+                                       :service-port 80}))))

src/test/cljs/dda/c4k_common/macros_test.cljs

@@ -4,7 +4,7 @@
    [dda.c4k-common.macros :refer-macros [inline-resources]]))
 
 (deftest should-count-inline-resources
-  (is (= 3 (count (inline-resources "ingress")))))
+  (is (= 4 (count (inline-resources "ingress")))))
 
 (deftest should-inline-resources
   (let [resource-path (fn [name] (str "dda/c4k_common/inline_resources_test/" name))]