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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>
101 lines
3.7 KiB
Elixir
101 lines
3.7 KiB
Elixir
defmodule BerrypodWeb.AnalyticsHook do
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@moduledoc """
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LiveView on_mount hook for analytics — Layer 2 of the progressive pipeline.
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Reads analytics data from the session (set by the Plugs.Analytics plug) and
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tracks subsequent SPA navigations via handle_params. Skips the initial mount
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since the plug already recorded that pageview.
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Also handles the `analytics:screen` event from the JS hook (Layer 3) to
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capture screen width for device classification.
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"""
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import Phoenix.Component, only: [assign: 3]
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import Phoenix.LiveView, only: [attach_hook: 4, connected?: 1]
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alias Berrypod.Analytics
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def on_mount(:track, _params, session, socket) do
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socket =
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socket
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|> assign(:analytics_visitor_hash, session["analytics_visitor_hash"])
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|> assign(:analytics_browser, session["analytics_browser"])
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|> assign(:analytics_os, session["analytics_os"])
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|> assign(:analytics_referrer, session["analytics_referrer"])
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|> assign(:analytics_referrer_source, session["analytics_referrer_source"])
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|> assign(:analytics_utm_source, session["analytics_utm_source"])
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|> assign(:analytics_utm_medium, session["analytics_utm_medium"])
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|> assign(:analytics_utm_campaign, session["analytics_utm_campaign"])
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|> assign(:analytics_screen_size, session["analytics_screen_size"])
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|> assign(:analytics_country_code, session["country_code"])
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|> assign(:analytics_initial_mount, true)
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socket =
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if connected?(socket) and socket.assigns.analytics_visitor_hash do
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socket
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|> attach_hook(:analytics_params, :handle_params, &handle_analytics_params/3)
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|> attach_hook(:analytics_events, :handle_event, &handle_analytics_event/3)
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else
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socket
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end
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{:cont, socket}
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end
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defp handle_analytics_params(_params, uri, socket) do
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# Skip the initial mount — the plug already recorded this pageview
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if socket.assigns.analytics_initial_mount do
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{:cont, assign(socket, :analytics_initial_mount, false)}
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else
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# Skip if admin user is browsing
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if admin?(socket) do
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{:cont, socket}
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else
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pathname = URI.parse(uri).path
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Analytics.track_pageview(%{
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pathname: pathname,
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visitor_hash: socket.assigns.analytics_visitor_hash,
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referrer: socket.assigns.analytics_referrer,
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referrer_source: socket.assigns.analytics_referrer_source,
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utm_source: socket.assigns.analytics_utm_source,
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utm_medium: socket.assigns.analytics_utm_medium,
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utm_campaign: socket.assigns.analytics_utm_campaign,
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country_code: socket.assigns.analytics_country_code,
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screen_size: socket.assigns.analytics_screen_size,
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browser: socket.assigns.analytics_browser,
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os: socket.assigns.analytics_os
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})
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# Clear referrer/UTMs after first SPA navigation — they only apply to the entry
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{:cont,
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socket
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|> assign(:analytics_referrer, nil)
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|> assign(:analytics_referrer_source, nil)
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|> assign(:analytics_utm_source, nil)
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|> assign(:analytics_utm_medium, nil)
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|> assign(:analytics_utm_campaign, nil)}
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end
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end
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end
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defp handle_analytics_event("analytics:screen", %{"width" => width}, socket)
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when is_integer(width) do
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screen_size = classify_screen(width)
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{:cont, assign(socket, :analytics_screen_size, screen_size)}
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end
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defp handle_analytics_event(_event, _params, socket), do: {:cont, socket}
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defp classify_screen(width) when width < 768, do: "mobile"
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defp classify_screen(width) when width < 1024, do: "tablet"
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defp classify_screen(_width), do: "desktop"
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defp admin?(socket) do
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case socket.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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end
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