docs: Restish cli guide

docs/api/restish.md

@@ -0,0 +1,262 @@
+# Using Restish as a CLI
+
+The pgEdge Control Plane makes use of a tool called [Restish](https://rest.sh) to get a CLI-like experience against the Control Plane's HTTP API. Restish is a generic, open-source REST client that turns any [OpenAPI](openapi.md)-described API into a set of generated commands, complete with shell completion and readable output.
+
+Jump to what you're trying to do:
+
+- **[Quickstart](#quickstart)** — install Restish and run your first command against a cluster.
+- **[Managing Multiple Environments](#managing-multiple-environments)** — one cluster isn't enough, or you want a persistent setup you (and your team, if you have one) can reuse instead of reconnecting by hand every time.
+- **[Managing Database Configuration as Files](#managing-database-configuration-as-files)** — commit database specs to source control instead of typing JSON inline.
+
+## Quickstart
+
+If you already have a Control Plane cluster running (see the
+[installation quickstart](../installation/quickstart.md) if not), you can
+be running commands against it in three steps:
+
+First, install Restish:
+
+```sh
+brew install restish
+```
+
+Then connect Restish to your cluster:
+
+!!! warning
+
+    Only connect this way to clusters and databases you're okay with experimenting on. See [Managing Multiple Environments](#managing-multiple-environments)
+    before connecting Restish to anything production.
+
+
+```sh
+restish api connect pgedge http://localhost:3000
+```
+
+Then run your first command:
+
+```sh
+restish pgedge list-databases
+```
+
+That's enough to start experimenting — `restish pgedge --help` lists every
+generated command, and once you have a database config file (see
+[Managing Database Configuration as Files](#managing-database-configuration-as-files)
+below), `restish pgedge create-database < your-file.json` creates one.
+
+See the [Restish install guide](https://rest.sh/docs/getting-started/install/)
+for other install options, including release archives, containers, and
+building from source.
+
+## Managing Multiple Environments
+
+Restish doesn't enforce any naming convention for the APIs you connect to.
+We recommend using Restish's **profiles** feature: one API registration, `pgedge`, holds a profile per environment, and each profile can override the base URL (and, if you need it later, auth or other per-environment request details).
+
+**Use descriptive cluster names.** Every cluster has its own durable `id`,
+set at initialization and returned by `get-cluster`. `init-cluster` takes
+an optional `cluster_id` query parameter. Setting it to something descriptive will allow you to keep track of multiple different clusters.
+
+```sh
+curl "http://host1.internal:3000/v1/cluster/init?cluster_id=production"
+```
+
+Then select that cluster with a matching profile:
+
+```sh
+restish -p production pgedge list-databases
+restish -p staging pgedge list-databases
+```
+
+**Leave the `default` profile pointed at something safe.** Restish falls
+back to the `default` profile whenever you don't pass `-p`/`--rsh-profile`
+or set `RSH_PROFILE`, so be sure to point `default` at your local or informal cluster.
+
+```sh
+restish pgedge list-databases   # default profile: local/informal cluster
+```
+
+!!! note
+
+    A cluster is made up of multiple hosts, each with its own host ID
+    (e.g. `host-1`). Any of them can serve a request for the whole
+    cluster, which is why one `base_url` per environment is enough for
+    routine use — you don't need a profile per host. To target a specific
+    host directly (retrying against a different one, or comparing behavior
+    across hosts while debugging), give it its own profile the same way:
+    `-p production-host-1`.
+
+### Persisting Connections in a Project Config
+
+Register `pgedge` once, with a profile per environment, in a `.restish.json`
+file at the root of your infrastructure repo, instead of re-running
+`restish api connect` by hand every time you check it out. Restish
+discovers this file by walking up from your current directory:
+
+```jsonc
+{
+  "apis": {
+    "pgedge": {
+      "base_url": "http://host1.internal:3000",
+      "profiles": {
+        "default": {},
+        "staging": {
+          "base_url": "http://host1.staging.internal:3000"
+        },
+        "production": {
+          "base_url": "https://host1.prod.internal:3000"
+        }
+      }
+    }
+  }
+}
+```
+
+The top-level `base_url` is what the `default` profile falls back to — the
+same safe-fallback rule described above, expressed as config instead of
+prose. `staging` and `production` each override it, and only take effect
+when you pass `-p`.
+
+Commit this file, then run the following once per checkout:
+
+```sh
+restish config trust
+```
+
+Restish records that trust decision outside the repo, keyed to the file's
+contents, so your connections and profiles are ready every time you check
+out the repo. If working with a team, everyone ends up with the same
+setup without manually running `restish api connect` or keeping a personal
+copy in sync.
+
+!!! note
+
+    A project config only honors the `apis` and `theme` keys — nothing
+    else. Keep it secret-free: the Control Plane's dev and local endpoints
+    don't need auth, so these profiles can stay limited to `base_url` as
+    shown above. If a cluster you connect to does require auth, reference
+    the value as `env:NAME` rather than committing it literally.
+
+If a cluster has [mTLS enabled](../installation/mtls.md), add the CA and
+client certificate paths to that profile. These are file paths, not the
+credentials themselves, so — unlike a token or password — they're fine to
+commit as long as everyone using the file also has the actual `ca.crt`,
+`client.crt`, and `client.key` in place locally:
+
+```jsonc
+"production": {
+  "base_url": "https://host1.prod.internal:3000",
+  "ca_cert": "/opt/pgedge/control-plane/ca.crt",
+  "client_cert": "/opt/pgedge/control-plane/client.crt",
+  "client_key": "/opt/pgedge/control-plane/client.key"
+}
+```
+
+Not every connection belongs in that shared file, though. Anything that's
+ per-machine (eg. a Lima VM IP that's different for every developer, a personal sandbox) should stay out of source control. Restish also
+won't let you add a profile to an API that came from trusted project
+config, so register a personal one under its own name instead, which
+writes to your own local Restish config:
+
+```sh
+restish api connect pgedge-sandbox http://192.168.64.3:3000
+```
+
+If a cluster uses TLS with a private CA, or discovery fails for a
+connection set up this way, pass `--spec` with an explicit URL or local
+file:
+
+```sh
+restish api connect pgedge-sandbox https://192.168.64.3:3000 --spec https://192.168.64.3:3000/v1/openapi.json
+```
+
+Either way you connect something, the same commands work afterward:
+
+```sh
+restish api list                     # every connection you've configured
+restish api inspect pgedge           # the URL, profiles, and spec Restish resolved
+restish api remove pgedge-sandbox    # disconnect (personal connections only)
+restish pgedge --help                # every generated command
+restish pgedge list-databases --help # options for one command
+```
+
+## Managing Database Configuration as Files
+
+Keep one file per database, and use it as the source of truth for that
+database's configuration:
+
+```sh
+mkdir -p databases
+cat > databases/example.json <<'EOF'
+{
+    "id": "example",
+    "spec": {
+        "database_name": "example",
+        "database_users": [
+            {
+                "username": "admin",
+                "password": "password",
+                "db_owner": true,
+                "attributes": ["SUPERUSER", "LOGIN"]
+            }
+        ],
+        "port": 5432,
+        "nodes": [
+            { "name": "n1", "host_ids": ["host-1"] },
+            { "name": "n2", "host_ids": ["host-2"] },
+            { "name": "n3", "host_ids": ["host-3"] }
+        ]
+    }
+}
+EOF
+```
+
+Apply it by piping the file into the generated command, rather than typing
+the JSON body inline:
+
+```sh
+restish pgedge create-database < databases/example.json
+```
+
+Update the same database by editing the file and re-applying it against the
+`update-database` command:
+
+```sh
+restish pgedge update-database example < databases/example.json
+```
+
+To apply the same file to a specific environment instead of your default
+cluster, add the profile you set up in
+[Managing Multiple Environments](#managing-multiple-environments):
+
+```sh
+restish -p staging pgedge create-database < databases/example.json
+restish -p production pgedge update-database example < databases/example.json
+```
+
+This gives you a directory of database configuration files you can commit
+to source control, diff, review in a pull request, and re-apply — the same
+workflow you'd use for any other infrastructure-as-code.
+
+### Handling Secrets
+
+The one field in these files that doesn't belong in source control is
+`database_users[].password` (and, if you're configuring backups,
+credentials like `s3_key_secret`). The Control Plane's update endpoint is
+built to make this easy: **secret fields are only required the first time
+you create a database. On every `update-database` call after that, you can
+leave them out entirely** — the Control Plane keeps whatever value is
+already stored unless you explicitly send a new one. See
+[Updating a Database](../using/update-db.md) for the full behavior.
+
+In practice, that means the default workflow is:
+
+1. Run `create-database` once, with real secret values, from a copy of the
+   file that never gets committed.
+2. Immediately delete the secret fields from `databases/example.json` before
+   committing it.
+3. From then on, `update-database` runs against the secret-free file. If you
+   need to rotate a password, set it in the file for that one apply, then
+   remove it again before committing.
+
+The committed file is always safe to read, diff, and share — it never holds
+a credential past the moment it was first used.

mkdocs.yml

@@ -92,6 +92,7 @@ nav:
   - API:
       - OpenAPI: api/openapi.md
       - API Reference: api/reference.md
+      - Using Restish as a CLI: api/restish.md
   - Development:
       - Development Process: development/development.md
       - Automated End-to-End tests: development/e2e-tests.md