📖 add public api docs (#1331)

* public api docs

Signed-off-by: everettraven <[email protected]>

* post rebase fixes

Signed-off-by: everettraven <[email protected]>

* address nits

Signed-off-by: everettraven <[email protected]>

* Update docs/api-reference/catalogd-webserver.md

Co-authored-by: Joe Lanford <[email protected]>

---------

Signed-off-by: everettraven <[email protected]>
Co-authored-by: Joe Lanford <[email protected]>

Author: everettraven

docs/api-reference/catalogd-webserver.md

@@ -0,0 +1,88 @@
+# Catalogd web server
+
+[Catalogd](https://github.com/operator-framework/catalogd), the OLM v1 component for making catalog contents available on cluster, includes
+a web server that serves catalog contents to clients via an HTTP(S) endpoint.
+
+The endpoint to retrieve this information is provided in the `.status.contentURL` of a `ClusterCatalog` resource.
+As an example:
+
+```yaml
+    contentURL: https://catalogd-service.olmv1-system.svc/catalogs/operatorhubio/all.json
+```
+
+!!! note
+
+    The value of the `.status.contentURL` field in a `ClusterCatalog` resource is an arbitrary string value and can change at any time.
+    While there are no guarantees on the exact value of this field, it will always be a URL that resolves successfully for clients using
+    it to make a request from within the cluster.
+
+## Interacting With the Server
+
+### Supported HTTP Methods
+
+The HTTP request methods supported by the catalogd web server are:
+
+- [GET](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/GET)
+- [HEAD](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/HEAD)
+
+### Response Format
+
+Responses are encoded as a [JSON Lines](https://jsonlines.org/) stream of [File-Based Catalog](https://olm.operatorframework.io/docs/reference/file-based-catalogs) (FBC) [Meta](https://olm.operatorframework.io/docs/reference/file-based-catalogs/#schema) objects delimited by newlines.
+
+??? example "Example JSON-encoded FBC snippet"
+
+    ```json
+    {
+        "schema": "olm.package",
+        "name": "cockroachdb",
+        "defaultChannel": "stable-v6.x",
+    }
+    {
+        "schema": "olm.channel",
+        "name": "stable-v6.x",
+        "package": "cockroachdb",
+        "entries": [
+            {
+                "name": "cockroachdb.v6.0.0",
+                "skipRange": "<6.0.0"
+            }
+        ]
+    }
+    {
+        "schema": "olm.bundle",
+        "name": "cockroachdb.v6.0.0",
+        "package": "cockroachdb",
+        "image": "quay.io/openshift-community-operators/cockroachdb@sha256:d3016b1507515fc7712f9c47fd9082baf9ccb070aaab58ed0ef6e5abdedde8ba",
+        "properties": [
+            {
+                "type": "olm.package",
+                "value": {
+                    "packageName": "cockroachdb",
+                    "version": "6.0.0"
+                }
+            },
+        ],
+    }
+    ```
+
+    Corresponding JSON lines response:
+    ```jsonlines
+    {"schema":"olm.package","name":"cockroachdb","defaultChannel":"stable-v6.x"}
+    {"schema":"olm.channel","name":"stable-v6.x","package":"cockroachdb","entries":[{"name":"cockroachdb.v6.0.0","skipRange":"<6.0.0"}]}
+    {"schema":"olm.bundle","name":"cockroachdb.v6.0.0","package":"cockroachdb","image":"quay.io/openshift-community-operators/cockroachdb@sha256:d3016b1507515fc7712f9c47fd9082baf9ccb070aaab58ed0ef6e5abdedde8ba","properties":[{"type":"olm.package","value":{"packageName":"cockroachdb","version":"6.0.0"}}]}
+    ```
+
+### Compression Support
+
+The `catalogd` web server supports gzip compression of responses, which can significantly reduce associated network traffic.  In order to signal that the client handles compressed responses, the client must include `Accept-Encoding: gzip` as a header in the HTTP request.
+
+The web server will include a `Content-Encoding: gzip` header in compressed responses.
+
+!!! note
+
+    Only catalogs whose uncompressed response body would result in a response size greater than 1400 bytes will be compressed.
+
+### Cache Header Support
+
+For clients interested in caching the information returned from the `catalogd` web server, the `Last-Modified` header is set
+on responses and the `If-Modified-Since` header is supported for requests.

docs/project/public-api.md

@@ -0,0 +1,12 @@
+# Public API
+The public API of OLM v1 is as follows:
+
+- Kubernetes APIs. For more information on these APIs, see:
+    - [operator-controller API reference](./api/operator-controller-api-reference.md)
+    - [catalogd API reference](./api/catalogd-api-reference.md)
+- `Catalogd` web server. For more information on what this includes, see the [catalogd web server documentation](./api/catalogd-webserver.md)
+
+!!! warning
+
+    Only what is mentioned in the above documentation references is considered part of the public API
+    and follows SemVer. Anything not mentioned in the above references is prone to breaking changes.

mkdocs.yml

@@ -25,6 +25,7 @@ nav:
     - Design Decisions: project/olmv1_design_decisions.md
     - Limitations: project/olmv1_limitations.md
     - Roadmap: project/olmv1_roadmap.md
+    - Public API: project/public-api.md
   - Getting Started: getting-started/olmv1_getting_started.md
   - Tutorials:
     - Add a Catalog: tutorials/add-catalog.md
@@ -49,6 +50,7 @@ nav:
   - API Reference:
     - Operator Controller API reference: api-reference/operator-controller-api-reference.md
     - CatalogD API reference: api-reference/catalogd-api-reference.md
+    - CatalogD Web Server reference: api-reference/catalogd-webserver.md
   - Contribute:
     - Contributing: contribute/contributing.md
     - Developing OLM v1: contribute/developer.md