API products might represent an entire product with many APIs, such as a pet store, or a large feature within the product that you want to treat separately, such as a checkout cart.

Before you begin

Create ApiDocs, which includes prerequisite steps to install Gloo Portal and to deploy OpenAPI services.

About API products

API products are what your users find and use in your developer portal. The API products might represent an entire product with many APIs, such as a pet store, or a large feature within the product that you want to treat separately, such as a checkout cart. Each API product might represent a particular version of your API.

API products target the route that the backing app is available on. This way, you have greater flexibility in how you structure your API products. To bundle your APIs into an API product, you use a Gloo RouteTable custom resource.

By using a Gloo route table, you can automatically add apps via Kubernetes labels or specify them at more fine-grained levels. You also get more advanced networking control, such as matching, redirect, rewrite, direct response, and forwarding actions. This way, you can set up complex rules for how your API products behave under different circumstances.

Choose the API product strategy that’s right for your developer portal.

  • One API product per developer portal: For smaller or test use cases, you might just have one API product that you want to expose in a developer portal. In this case, you can create just one route table to represent that API product. See Bundle your APIs into an API product.
  • Multiple API products per developer portal: For many use cases, your developer portal exposes several API products. To support this setup, see Create a domain-level route table for multiple API products. This approach uses route delegation.

The API products are exposed through the ingress gateway that you set up. Your end users can access these API products securely via the ingress gateway by logging into the developer portal frontend that you deploy later.

With the examples in this guide, you can build a flexible API product setup as shown in the following diagram.

Figure: API product routing overview
Figure: API product routing overview
  1. The APIs are the apps that you previously deployed, and represent the destinations that you can route requests to. Each app has a corresponding Gloo ApiDoc that defines the OpenAPI spec.
  2. The API products include the routing rules to the backing API services.
    • The Tracks API product represents a single microservice, the tracks API.
    • The Petstore API product represents three microservices, the pets, store, and users APIs. Gloo can stitch together these services into a single schema to bundle and share these APIs as a single API product in the developer portal.
  3. You create more routing rules for the host domain, api.example.com, that you want to use for all your API products. Requests to this host domain are delegated to the routes of the Tracks and Petstore API products.
  4. The gateway routes ingress requests from your end users along the api.example.com host to the matching route for the APIs in each API product.

Create API products

The following steps set up the scenario described in the About API products section. This setup includes several API products that are exposed under the same host domain. You can adapt these steps to your particular requirements, such as creating more API products, configuring several different host domains, or replacing the HTTP gateway with an HTTPS gateway.

Step 1: Bundle your APIs into an API product

Configure the portal metadata and routing rules for the apps that you previously deployed. This way, Gloo knows which backing APIs to use to serve information for requests along particular paths.

The following steps create two API products:

  • The Tracks API product represents a single microservice, the tracks API.
  • The Petstore API product represents three microservices, the pets, store, and users APIs. Gloo can stitch together these services into a single schema to bundle and share these APIs as a single API product in the developer portal.

  1. Decide on the information for your Tracks API product to display in the end-user facing API documentation in your developer portal. For more information about each setting, see the API docs.

      
  portalMetadata:
    title: "Catstronauts REST API"
    description: "REST API for Catstronauts to retrieve data for tracks, authors and modules."
    termsOfService: "You must authenticate to use this API! And other Terms of Service."
    contact: "support@example.com"
    license: "License info, such as MIT"

  2. Create a route table to represent an API Product for a single API, such as your tracks app.

      kubectl apply -f - << EOF
apiVersion: networking.gloo.solo.io/v2
kind: RouteTable
metadata:
  name: tracks-rt
  namespace: gloo-mesh-gateways
  labels:
     portal: dev-portal
     api: tracks
spec:
  http:
  - name: tracks-api
    labels:
      usagePlans: dev-portal
    matchers:
    - uri:
        prefix: /
    forwardTo:
      pathRewrite: /
      destinations:
      - ref:
          name: tracks-rest-api
          namespace: tracks
        port:
          number: 5000
  portalMetadata:
    title: "Catstronauts REST API"
    description: "REST API for Catstronauts to retrieve data for tracks, authors and modules."
    termsOfService: "You must authenticate to use this API! And other Terms of Service."
    contact: "support@example.com"
    license: "License info, such as MIT"
EOF

    Review the following table to understand this configuration. For more information, see the API docs.

    SettingDescription
    NamespaceCreate the route table in the same namespace, or import it into the same Gloo workspace as the ingress gateway. In this example, the route table is in the same namespace as the ingress gateway, gloo-mesh-gateways.
    LabelsInclude labels to help select this route table with other portal resources later. This example has two labels. The portal: dev-portal label can be used to associate this route table as part of the dev-portal collection of Gloo resources, while the api: tracks label can be used to associate this route table more specifically with the Tracks API.
    HTTP name and labelsName your route and add a label that you can use to apply the policies of your usage plan to the route later. In this example, the tracks-api route has a usagePlans: dev-portal label.
    HTTP matchers and forwardTo for the routeFor each app that you want to expose APIs for, define the route matchers that you want the APIs to be available on. This example defines the / route for the tracks-rest-api. Then, these routes are available on the matching host, such as api.example.com/.
    Portal metadataA set of key-value pairs that describe your API, which you put together in the previous step. Later, your developer portal displays this information in the end-user facing API documentation.

  3. Decide on the information for your Pet Store API product, which is a collection of several microservices that you previously deployed. Later, your developer portal displays this information in the end-user facing API documentation. For more information, see the API docs.

      
  portalMetadata:
    title: "Pet Store REST API"
    description: "Totally awesome API for all things pets!"
    termsOfService: "You must authenticate to use this API! And other Terms of Service."
    contact: "support@example.com"
    license: "License info, such as MIT"

  4. Create a route table that represents the Pet Store API product for your pets, users, and store API microservices.

      kubectl apply -f - << EOF
apiVersion: networking.gloo.solo.io/v2
kind: RouteTable
metadata:
  name: petstore-rt
  namespace: gloo-mesh-gateways
  labels:
     portal: dev-portal
     api: petstore
spec:
  http:
  - name: pets-api
    labels:
      usagePlans: dev-portal
    matchers:
    - uri:
        prefix: /pet
    forwardTo:
      destinations:
      - ref:
          name: pets-rest-api
          namespace: pets
        port:
          number: 5000
  - name: users-api
    labels:
      usagePlans: dev-portal
    matchers:
    - uri:
        prefix: /user
    forwardTo:
      destinations:
      - ref:
          name: users-rest-api
          namespace: users
        port:
          number: 5000
  - name: store-api
    labels:
      usagePlans: dev-portal       
    matchers:
    - uri:
        prefix: /store
    forwardTo:
      destinations:
      - ref:
          name: store-rest-api
          namespace: store
        port:
          number: 5000
  portalMetadata:
    title: "Pet Store REST API"
    description: "Totally awesome API for all things pets!"
    termsOfService: "You must authenticate to use this API! And other Terms of Service."
    contact: "support@example.com"
    license: "License info, such as MIT"
EOF

    Review the following table to understand this configuration. For more information, see the description from the previous step and the API docs.

    SettingDescription
    HTTP name and labelsName your route and add a label that you can use to apply the policies of your usage plan to the route later. In this example, each route has a usagePlans: dev-portal label.
    HTTP matchers and forwardTo for the routeFor each app that you want to expose APIs for, define the route matchers that you want the APIs to be available on. This example defines three routes: /pet, /user, and /store. These routes correspond to three APIs that you previously deployed, which Gloo can then stitch together into a single schema to build the Petstore API product. Then, these routes are available on the matching host, such as api.example.com/pet, api.example.com/users, or api.example.com/store.
    Portal metadataA set of key-value pairs that describe your API, which you put together in the previous step. Later, your developer portal displays this information in the end-user facing API documentation.

  5. To configure the domain that you want your API products exposed on, continue to the next step.

Step 2: Create a domain-level route table for multiple API products

For many use cases, your developer portal exposes several API products. To support this setup, you can create one overarching route table for the domain of your developer portal. Then, you can delegate matching routes along certain API paths to other route tables that represent that API product.

This way, you have one main route table for the domain that you can use to expose all of the API products that it includes, such as when you create a usage plan. You can easily add more API products by delegating to more route tables. You also still keep the flexibility to apply usage plans to the particular API product’s route tables within the overarching domain’s route table, for more granular control.

  1. Create individual route tables for each API product that you want to expose.

  2. Create a route table for the domain that you want your API products to be exposed on. This route table delegates the routing rules for matching HTTP routes to the route tables that you previously created. Note that the following example does not set any portal metadata, because that information is set per API product in the delegated route tables.

      kubectl apply -f - << EOF
apiVersion: networking.gloo.solo.io/v2
kind: RouteTable
metadata:
  name: api-example-com-rt
  namespace: gloo-mesh-gateways
spec:
  hosts:
  - api.example.com
  virtualGateways:
  - name: istio-ingressgateway
    namespace: gloo-mesh-gateways
  http:
  - matchers:
    - uri:
        prefix: /trackapi
    delegate:
      routeTables:
        - labels:
            api: tracks
  - matchers:
    - uri:
        prefix: /petstore
    delegate:
      routeTables:
        - labels:
            api: petstore
EOF

    Review the following table to understand this configuration. For more information, see the API docs.

    SettingDescription
    NamespaceCreate the route table in the same namespace or import it into the same Gloo workspace as the ingress gateway. In this example, the route table is in the same namespace as the ingress gateway, gloo-mesh-gateways.
    HostsAdd the host domains that you want the API products to be exposed on, such as api.example.com.
    Virtual gatewaySelect the ingress gateway with the host that you want to use to expose your apps’ APIs. In this example, the default ingress gateway is selected.
    HTTP matchers and delegationsFor each API product that you want to expose on the host domain, set up matchers and delegated route tables. In this example, requests that match /trackapi are delegated to the Tracks route table. Requests that match /petstore are delegated to the Petstore route table.

  3. To create the virtual gateway for the domain that you want your API products to be exposed on, continue to the next step.

Step 3: Create the gateway for your domain

To expose your API products, configure the ingress gateway to listen on a host and forward requests to the route tables.

  1. Create individual route tables for each API product that you want to expose.

  2. Optional: Create a domain-level route table if you want to expose several API products on the same domain.

  3. Create a virtual gateway for the host domain that you want to expose your API products on.

      kubectl apply -f - << EOF
apiVersion: networking.gloo.solo.io/v2
kind: VirtualGateway
metadata:
  name: istio-ingressgateway
  namespace: gloo-mesh-gateways
spec:
  listeners:
    - port:
        number: 80
      http: {}
      allowedRouteTables:
        - host: api.example.com
  workloads:
  - selector:
      labels:
        istio: ingressgateway
      cluster: $CLUSTER_NAME
EOF

    Review the following table to understand this configuration. For more information, see the API docs.

    SettingDescription
    Listener’s allowed route tablesAdd the host domain that matches the route table for the API products that you want to expose. In this example, the api.example.com matches the host in the domain-level route table that you created to expose together your two API products, Tracks and Petstore.

  4. To verify your setup, continue to the next step.

Step 4: Verify your setup

You can use the Gloo UI and the terminal to verify your API product routing setup.

Gloo UI

Review the stitched API schemas for your API products in the Gloo UI.

  1. Launch the Gloo UI.
      meshctl dashboard
  2. From the menu, click the APIs page and verify that you have two API products for both of the route tables that you created, petstore-rt and tracks-rt.
  3. Click one of the API products and verify that you can see the following information:
    • The API Schema that describes your app’s REST APIs. You can also click View OpenAPI to see the stitched schema of the API product in JSON format.
    • The Applied to Destinations shows the backing destinations of all of the apps that are included in the API product.
    • Note that the Portals are not shown yet, because you have not created the Portal resource.

Terminal

Verify that you can access your APIs through the ingress gateway on the host domain that you configured.

  1. Get the external address of your ingress gateway. The steps vary depending on the type of load balancer that backs the ingress gateway.

     ```shell
 export INGRESS_GW_ADDRESS=$(kubectl get svc -n gloo-mesh-gateways istio-ingressgateway -o jsonpath="{.status.loadBalancer.ingress[0]['hostname','ip']}")
 echo $INGRESS_GW_ADDRESS
 ```

    Note: Depending on your environment, you might see <pending> instead of an external IP address. For example, if you are testing locally in kind or minikube, or if you have insufficient permissions in your cloud platform, you can instead port-forward the service port of the ingress gateway:

      kubectl -n gloo-mesh-gateways port-forward deploy/istio-ingressgateway-1-18 8081
  2. In your terminal, send a curl request to both of the API products that you set up. Note that the routes are not yet secured. You secure the routes with rate limiting and external auth policies later as part of your portal’s usage plan.
    • api.example.com is the host that you set in both the domain-level route table and the virtual gateway.
    • /trackapi is the prefix that you set in both the domain-level route table to delegate requests to the tracks-rt route table.
    • /tracks is an endpoint from the tracks API in the tracks-rt route table.
      curl -v --resolve api.example.com:80:${INGRESS_GW_IP} http://api.example.com/trackapi/tracks

    Example output:

      < HTTP/1.1 200 OK
...
[
  {
    "id": "c_0",
    "thumbnail": "https://res.cloudinary.com/dety84pbu/image/upload/v1598465568/nebula_cat_djkt9r.jpg",
    "topic": "Cat-stronomy",
    "authorId": "cat-1",
    "title": "Cat-stronomy, an introduction",
    "description": "Curious to learn what Cat-stronomy is all about? Explore the planetary and celestial alignments and how they have affected our space missions.",
    "numberOfViews": 163,
    "createdAt": "2018-09-10T07:13:53.020Z",
    "length": 2377,
    "modulesCount": 10,
    "modules": [
      "l_0",
      "l_1",
      "l_2",
      "l_3",
      "l_4",
      "l_5",
      "l_6",
      "l_7",
      "l_8",
      "l_9"
    ]
  },
...
    • api.example.com is the host that you set in both the domain-level route table and the virtual gateway.
    • /petstore is the prefix that you set in both the domain-level route table to delegate requests to the petstore-rt route table.
    • /pet, /user, and /order are endpoints from the stitched API schema of the petstore-rt route table. Note that, even though these APIs are served by different backing destinations, they are all available under the same /petstore prefix for the single route table that you set up for this Petstore API product.
      curl -v --resolve api.example.com:80:${INGRESS_GW_IP} http://api.example.com/petstore/pet
curl -v --resolve api.example.com:80:${INGRESS_GW_IP} http://api.example.com/petstore/user
curl -v --resolve api.example.com:80:${INGRESS_GW_IP} http://api.example.com/petstore/store/order

    Example output:

      < HTTP/1.1 200 OK
...
[
  {
    "id": 1,
    "name": "Barky",
    "photoUrls": [
      "image1.jpg"
    ],
...