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docs(gateway): document per-agent static frontend split mode

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iris 2026-06-01 17:24:28 +02:00 • committed by mara
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docs/gateway.md
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@ -234,6 +234,79 @@ State lives at `/var/lib/nixos-containers/hive-forge/var/lib/forgejo/`
and survives container restart / host reboot. To wipe, destroy the
container.
## Per-agent static frontend split
When `services.hyperhive.frontend` is configured, hive-c0re injects
`HIVE_AGENT_FRONTEND_DIR = "${cfg.frontend}/agent"` into its service
environment. The nginx include generator (`gateway_nginx::write`) reads
this variable and, when set, emits split location blocks per agent
instead of the legacy single-proxy block.
**Location priority for `/agent/<name>/...`:**
```nginx
# 1. Compiled assets — content-addressed nix store path, cache forever
location ^~ /agent/<name>/static/ {
alias <frontend>/static/;
expires 1y;
add_header Cache-Control "public, immutable, max-age=31536000";
}
# 2. Static dist + proxy fallback for dynamic paths
location /agent/<name>/ {
alias <frontend>/;
try_files $uri $uri.html $uri/index.html @<name>_dynamic;
}
# 3. Proxy catchall — API, events, icon, send, login, …
location @<name>_dynamic {
proxy_pass <upstream>;
proxy_set_header X-Forwarded-Prefix /agent/<name>;
proxy_intercept_errors on;
error_page 502 503 504 = /__hive_agent_unreachable;
# … (full proxy header block)
}
```
**`try_files` resolution** (nginx applies the `alias` mapping before
checking file existence):
| request | resolved | outcome |
| --- | --- | --- |
| `/agent/iris/` | `<frontend>/index.html` | main agent page |
| `/agent/iris/stats` | `<frontend>/stats.html` | stats page |
| `/agent/iris/screen` | `<frontend>/screen.html` | screen page |
| `/agent/iris/static/app.js` | caught by `^~` block first | served with immutable cache |
| `/agent/iris/api/state` | no file match → `@iris_dynamic` | proxied to agent daemon |
| `/agent/iris/events/live` | no file match → `@iris_dynamic` | proxied (SSE) |
Adding a new HTML page to the frontend dist (`dist/<page>.html`)
automatically makes it reachable at `/agent/<name>/<page>` — no
generator change needed.
**Why `^~` for `/static/`**: the `^~` prefix gives this block higher
priority than the plain prefix `location /agent/<name>/`, so compiled
JS/CSS assets skip `try_files` entirely and get the immutable cache
headers. Nix store paths are content-addressed — the hash changes on
any content change — so `max-age=31536000` is safe.
**Why nix store is reachable from the gateway container**: nspawn
containers bind-mount `/nix/store` read-only by default. The
`HIVE_AGENT_FRONTEND_DIR` path is a nix store path baked in at
hive-c0re build time — the same path is visible to both c0re (writing
`agents.conf`) and the gateway nginx (serving files from it).
**Graceful degradation**: if `HIVE_AGENT_FRONTEND_DIR` is empty or
unset (e.g. a build that predates `cfg.frontend`), each agent gets the
legacy single-proxy block and all traffic is forwarded to the agent
daemon as before.
**`extraFiles`**: per-agent `hyperhive.frontend.extraFiles` are in
`mergedDist`, not in the base `cfg.frontend` dist. They are not under
the nix-store `alias` path, so requests for them fall through
`try_files` to `@<name>_dynamic` and are served by the agent daemon
as before.
## Per-agent error pages
`/agent/<name>/` requests hit two failure modes; both get static