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Three-layer pipeline: Plug for all HTTP requests (no JS needed), LiveView hook for SPA navigations, JS hook for screen width. ETS-backed buffer batches writes to SQLite every 10s. Daily-rotating salt for visitor hashing. Includes admin dashboard with date ranges, visitor trends, top pages, sources, devices, and e-commerce conversion funnel. Oban cron for 12-month data retention. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
113 lines
3.2 KiB
Elixir
113 lines
3.2 KiB
Elixir
defmodule BerrypodWeb.Plugs.Analytics do
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@moduledoc """
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Plug that records a pageview event on every shop HTTP request.
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This is Layer 1 of the progressive analytics pipeline — it fires on every
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GET request regardless of whether JS is enabled. Computes a privacy-friendly
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visitor hash, parses the user agent, extracts referrer and UTM params, and
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buffers the event for batch writing to SQLite.
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Also stores analytics data in the session so the LiveView hook (Layer 2)
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can read it for subsequent SPA navigations.
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"""
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import Plug.Conn
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alias Berrypod.Analytics
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alias Berrypod.Analytics.{Salt, UAParser, Referrer}
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def init(opts), do: opts
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def call(%{method: "GET"} = conn, _opts) do
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ua = get_req_header(conn, "user-agent") |> List.first("")
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{browser, os} = UAParser.parse(ua)
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# Skip bots
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if browser == "Bot" do
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conn
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else
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# Skip if the logged-in admin is browsing
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if admin?(conn) do
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prepare_session(conn, ua, browser, os)
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else
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record_and_prepare(conn, ua, browser, os)
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end
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end
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end
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def call(conn, _opts), do: conn
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defp record_and_prepare(conn, ua, browser, os) do
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visitor_hash = Salt.hash_visitor(conn.remote_ip, ua)
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{referrer, referrer_source} = extract_referrer(conn)
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utm = extract_utms(conn)
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country_code = get_session(conn, "country_code")
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screen_size = get_session(conn, "analytics_screen_size")
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Analytics.track_pageview(%{
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pathname: conn.request_path,
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visitor_hash: visitor_hash,
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referrer: referrer,
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referrer_source: referrer_source,
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utm_source: utm.source,
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utm_medium: utm.medium,
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utm_campaign: utm.campaign,
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country_code: country_code,
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screen_size: screen_size,
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browser: browser,
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os: os
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})
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conn
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|> put_session("analytics_visitor_hash", visitor_hash)
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|> put_session("analytics_browser", browser)
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|> put_session("analytics_os", os)
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|> put_session("analytics_referrer", referrer)
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|> put_session("analytics_referrer_source", referrer_source)
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|> put_session("analytics_utm_source", utm.source)
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|> put_session("analytics_utm_medium", utm.medium)
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|> put_session("analytics_utm_campaign", utm.campaign)
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end
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# Store session data for the hook even when we skip recording for admins
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defp prepare_session(conn, ua, browser, os) do
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visitor_hash = Salt.hash_visitor(conn.remote_ip, ua)
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conn
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|> put_session("analytics_visitor_hash", visitor_hash)
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|> put_session("analytics_browser", browser)
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|> put_session("analytics_os", os)
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end
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defp admin?(conn) do
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case conn.assigns[:current_scope] do
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%{user: %{}} -> true
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_ -> false
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end
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end
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defp extract_referrer(conn) do
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referrer_url = get_req_header(conn, "referer") |> List.first()
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{referrer, source} = Referrer.parse(referrer_url)
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# Don't count self-referrals
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host = conn.host
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if referrer && referrer == host do
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{nil, nil}
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else
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{referrer, source}
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end
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end
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defp extract_utms(conn) do
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params = conn.query_params || %{}
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%{
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source: Map.get(params, "utm_source"),
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medium: Map.get(params, "utm_medium"),
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campaign: Map.get(params, "utm_campaign")
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}
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end
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end
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