add docs for ratelimit invert match headers

Signed-off-by: Rudrakh Panigrahi <rudrakh97@gmail.com>
envoyproxy · Oct 21, 2024 · c286335 · c286335
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diff --git a/api/v1alpha1/ratelimit_types.go b/api/v1alpha1/ratelimit_types.go
@@ -166,7 +166,6 @@ type HeaderMatch struct { // TODO: zhaohuabing this type could be replaced with
 	//
 	// +optional
 	// +kubebuilder:default=false
-	// +notImplementedHide
 	Invert *bool `json:"invert,omitempty"`
 }
 

diff --git a/site/content/en/latest/tasks/traffic/global-rate-limit.md b/site/content/en/latest/tasks/traffic/global-rate-limit.md
@@ -433,11 +433,11 @@ server: envoy
 
 ```
 
-## Rate Limit Distinct Users 
+## Rate Limit Distinct Users Except Admin 
 
 Here is an example of a rate limit implemented by the application developer to limit distinct users who can be differentiated based on the 
 value in the `x-user-id` header. Here, user `one` (recognised from the traffic flow using the header `x-user-id` and value `one`) will be rate limited at 3 requests/hour
-and so will user `two` (recognised from the traffic flow using the header `x-user-id` and value `two`).
+and so will user `two` (recognised from the traffic flow using the header `x-user-id` and value `two`). But if `x-user-id` is `admin`, it will not be rate limited even beyond 3 requests/hour.
 
 {{< tabpane text=true >}}
 {{% tab header="Apply from stdin" %}}
@@ -461,6 +461,9 @@ spec:
         - headers:
           - type: Distinct
             name: x-user-id
+          - name: x-user-id
+            value: admin
+            invert: true
         limit:
           requests: 3
           unit: Hour
@@ -636,6 +639,47 @@ transfer-encoding: chunked
 
 ```
 
+But when the value for header `x-user-id` is set to `admin` and 4 requests are sent, all 4 of them should respond with 200 OK.
+
+```shell
+for i in {1..4}; do curl -I --header "Host: ratelimit.example" --header "x-user-id: admin" http://${GATEWAY_HOST}/get ; sleep 1; done
+```
+
+```console
+HTTP/1.1 200 OK
+content-type: application/json
+x-content-type-options: nosniff
+date: Wed, 08 Feb 2023 02:33:31 GMT
+content-length: 460
+x-envoy-upstream-service-time: 4
+server: envoy
+
+HTTP/1.1 200 OK
+content-type: application/json
+x-content-type-options: nosniff
+date: Wed, 08 Feb 2023 02:33:32 GMT
+content-length: 460
+x-envoy-upstream-service-time: 2
+server: envoy
+
+HTTP/1.1 200 OK
+content-type: application/json
+x-content-type-options: nosniff
+date: Wed, 08 Feb 2023 02:33:33 GMT
+content-length: 460
+x-envoy-upstream-service-time: 0
+server: envoy
+
+HTTP/1.1 200 OK
+content-type: application/json
+x-content-type-options: nosniff
+date: Wed, 08 Feb 2023 02:33:33 GMT
+content-length: 460
+x-envoy-upstream-service-time: 0
+server: envoy
+
+```
+
 ## Rate Limit All Requests 
 
 This example shows you how to rate limit all requests matching the HTTPRoute rule at 3 requests/Hour by leaving the `clientSelectors` field unset.
@@ -809,7 +853,7 @@ spec:
   targetRefs:
   - group: gateway.networking.k8s.io
     kind: HTTPRoute
-    name: http-ratelimit 
+    name: http-ratelimit
   rateLimit:
     type: Global
     global:
@@ -858,7 +902,7 @@ spec:
   targetRefs:
   - group: gateway.networking.k8s.io
     kind: HTTPRoute
-    name: http-ratelimit 
+    name: http-ratelimit
   rateLimit:
     type: Global
     global:

diff --git a/site/content/en/latest/tasks/traffic/local-rate-limit.md b/site/content/en/latest/tasks/traffic/local-rate-limit.md
@@ -245,6 +245,188 @@ server: envoy
 
 ```
 
+## Rate Limit Specific User Unless within Test Org
+
+Here is an example of a rate limit implemented by the application developer to limit a specific user by matching on a custom `x-user-id` header
+with a value set to `one`. But the user must not be limited if logging in within Test org, determined by custom header `x-org-id` set to `test`.
+
+{{< tabpane text=true >}}
+{{% tab header="Apply from stdin" %}}
+
+```shell
+cat <<EOF | kubectl apply -f -
+apiVersion: gateway.envoyproxy.io/v1alpha1
+kind: BackendTrafficPolicy 
+metadata:
+  name: policy-httproute
+spec:
+  targetRefs:
+  - group: gateway.networking.k8s.io
+    kind: HTTPRoute
+    name: http-ratelimit
+  rateLimit:
+    type: Local
+    local:
+      rules:
+      - clientSelectors:
+        - headers:
+          - name: x-user-id
+            value: one
+          - name: x-org-id
+            value: test
+            invert: true
+        limit:
+          requests: 3
+          unit: Hour
+EOF
+```
+
+{{% /tab %}}
+{{% tab header="Apply from file" %}}
+Save and apply the following resource to your cluster:
+
+```yaml
+---
+apiVersion: gateway.envoyproxy.io/v1alpha1
+kind: BackendTrafficPolicy 
+metadata:
+  name: policy-httproute
+spec:
+  targetRefs:
+  - group: gateway.networking.k8s.io
+    kind: HTTPRoute
+    name: http-ratelimit
+  rateLimit:
+    type: Local
+    local:
+      rules:
+      - clientSelectors:
+        - headers:
+          - name: x-user-id
+            value: one
+          - name: x-org-id
+            value: test
+            invert: true
+        limit:
+          requests: 3
+          unit: Hour
+```
+
+{{% /tab %}}
+{{< /tabpane >}}
+
+### HTTPRoute
+
+{{< tabpane text=true >}}
+{{% tab header="Apply from stdin" %}}
+
+```shell
+cat <<EOF | kubectl apply -f -
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: http-ratelimit
+spec:
+  parentRefs:
+  - name: eg
+  hostnames:
+  - ratelimit.example 
+  rules:
+  - matches:
+    - path:
+        type: PathPrefix
+        value: /
+    backendRefs:
+    - group: ""
+      kind: Service
+      name: backend
+      port: 3000
+EOF
+```
+
+{{% /tab %}}
+{{% tab header="Apply from file" %}}
+Save and apply the following resource to your cluster:
+
+```yaml
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: http-ratelimit
+spec:
+  parentRefs:
+  - name: eg
+  hostnames:
+  - ratelimit.example 
+  rules:
+  - matches:
+    - path:
+        type: PathPrefix
+        value: /
+    backendRefs:
+    - group: ""
+      kind: Service
+      name: backend
+      port: 3000
+```
+
+{{% /tab %}}
+{{< /tabpane >}}
+
+The HTTPRoute status should indicate that it has been accepted and is bound to the example Gateway.
+
+```shell
+kubectl get httproute/http-ratelimit -o yaml
+```
+
+Get the Gateway's address:
+
+```shell
+export GATEWAY_HOST=$(kubectl get gateway/eg -o jsonpath='{.status.addresses[0].value}')
+```
+
+Let's query `ratelimit.example/get` 4 times. We should receive a `200` response from the example Gateway for all the 4 requests, unlike previous example where the last request was rate limited.
+
+```shell
+for i in {1..4}; do curl -I --header "Host: ratelimit.example" --header "x-user-id: one" --header "x-org-id: test" http://${GATEWAY_HOST}/get ; sleep 1; done
+```
+
+```console
+HTTP/1.1 200 OK
+content-type: application/json
+x-content-type-options: nosniff
+date: Wed, 08 Feb 2023 02:33:31 GMT
+content-length: 460
+x-envoy-upstream-service-time: 4
+server: envoy
+
+HTTP/1.1 200 OK
+content-type: application/json
+x-content-type-options: nosniff
+date: Wed, 08 Feb 2023 02:33:32 GMT
+content-length: 460
+x-envoy-upstream-service-time: 2
+server: envoy
+
+HTTP/1.1 200 OK
+content-type: application/json
+x-content-type-options: nosniff
+date: Wed, 08 Feb 2023 02:33:33 GMT
+content-length: 460
+x-envoy-upstream-service-time: 0
+server: envoy
+
+HTTP/1.1 200 OK
+content-type: application/json
+x-content-type-options: nosniff
+date: Wed, 08 Feb 2023 02:33:33 GMT
+content-length: 460
+x-envoy-upstream-service-time: 0
+server: envoy
+
+```
+
 ## Rate Limit All Requests 
 
 This example shows you how to rate limit all requests matching the HTTPRoute rule at 3 requests/Hour by leaving the `clientSelectors` field unset.