Graham McIntire
578b4ede86
- Add ContactMapController serving /api/contacts/map with pre-gzipped JSON from Microwaveprop.Cache. Browsers handle Content-Encoding: gzip natively; payload drops from 5.7 MB raw to 1.5 MB on the wire (73%). Cache TTL 10 min, invalidated on contact insert alongside the other contact-map cache keys. - Move contact map payload out of the LiveView's initial HTML entirely. Shell renders with the filter chrome (count + band list); the hook fetches contacts from the HTTP endpoint in parallel with map init. This also avoids Phoenix.Socket's 64 KB frame limit (push_event would have required chunked transfer or a global frame size bump). - Parallelize ContactLive.Show hydrate: five independent DB loads (weather, solar, hrrr_path, terrain, iemre) now run concurrently via Task.async + Task.await_many. Total latency drops from sum(each) to max(each), cutting contact show hydrate time roughly 5x.
53 lines
1.6 KiB
Elixir
53 lines
1.6 KiB
Elixir
defmodule MicrowavepropWeb.ContactMapController do
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@moduledoc """
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Serves the contact map JSON payload as a standalone HTTP endpoint. Keeps
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the ~5 MB blob out of the `/contacts/map` LiveView's initial HTML response
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and lets the browser's native `Content-Encoding: gzip` handling do the
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compression. The payload itself is served from `Microwaveprop.Cache` via
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`Radio.contact_map_payload/0`.
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"""
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use MicrowavepropWeb, :controller
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alias Microwaveprop.Cache
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alias Microwaveprop.Radio
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@cache_key {__MODULE__, :gzipped_payload}
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@cache_ttl_ms 10 * 60 * 1_000
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@spec show(Plug.Conn.t(), map()) :: Plug.Conn.t()
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def show(conn, _params) do
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{body, encoding} = gzipped_or_plain_body(conn)
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conn
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|> put_resp_content_type("application/json")
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|> maybe_put_encoding(encoding)
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|> put_resp_header("cache-control", "public, max-age=60")
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|> send_resp(200, body)
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end
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defp gzipped_or_plain_body(conn) do
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if accepts_gzip?(conn) do
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{gzipped_payload(), :gzip}
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else
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%{json: iodata} = Radio.contact_map_payload()
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{IO.iodata_to_binary(iodata), :identity}
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end
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end
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defp gzipped_payload do
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Cache.fetch_or_store(@cache_key, @cache_ttl_ms, fn ->
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%{json: iodata} = Radio.contact_map_payload()
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:zlib.gzip(IO.iodata_to_binary(iodata))
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end)
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end
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defp accepts_gzip?(conn) do
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case get_req_header(conn, "accept-encoding") do
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[value | _] -> String.contains?(value, "gzip")
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_ -> false
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end
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end
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defp maybe_put_encoding(conn, :gzip), do: put_resp_header(conn, "content-encoding", "gzip")
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defp maybe_put_encoding(conn, :identity), do: conn
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end
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