Graham McIntire
bbe5bde145
Phoenix 1.8 app that scrapes ammunition retailers (Lucky Gunner, SGAmmo) for price data and displays historical price trends. - Data model: retailers, calibers, products, price snapshots - Scraper infrastructure with Req, Floki, realistic browser headers - Oban-scheduled scrape jobs (every 4h with randomized delays) - LiveView pages: homepage with category cards, caliber detail with price table, Chart.js price history, and price stats banner - 18 seeded calibers across handgun/rifle/rimfire/shotgun categories - 77 tests
71 lines
2.1 KiB
Elixir
71 lines
2.1 KiB
Elixir
defmodule Ammoprices.Scraping.Runner do
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@moduledoc false
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alias Ammoprices.Catalog
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alias Ammoprices.Prices
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alias Ammoprices.Scraping.HttpClient
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def run(scraper, caliber) do
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retailer = Catalog.get_retailer_by_slug!(scraper.retailer_slug())
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case scraper.category_url(caliber) do
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nil ->
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{:ok, %{products_count: 0, snapshots_count: 0}}
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path ->
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url = retailer.base_url <> path
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do_scrape(scraper, retailer, caliber, url)
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end
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end
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defp do_scrape(scraper, retailer, caliber, url) do
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case HttpClient.get(url) do
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{:ok, %{status: 200, body: body}} ->
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now = DateTime.truncate(DateTime.utc_now(), :second)
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parsed = scraper.parse_products(body)
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results =
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Enum.map(parsed, fn product_data ->
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product_attrs = %{
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title: product_data.title,
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url: product_data.url,
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brand: product_data.brand,
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grain_weight: product_data.grain_weight,
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round_count: product_data.round_count,
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casing: product_data.casing,
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condition: "new",
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in_stock: product_data.in_stock,
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last_seen_at: now
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}
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case Catalog.upsert_product(retailer.id, caliber.id, product_attrs) do
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{:ok, product} ->
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snapshot_attrs = %{
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price_cents: product_data.price_cents,
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price_per_round_cents: product_data.price_per_round_cents,
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in_stock: product_data.in_stock,
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recorded_at: now
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}
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{:ok, _snapshot} = Prices.create_snapshot(product.id, snapshot_attrs)
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:ok
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{:error, _changeset} ->
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:error
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end
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end)
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successful = Enum.count(results, &(&1 == :ok))
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Catalog.update_retailer(retailer, %{last_scraped_at: now})
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{:ok, %{products_count: successful, snapshots_count: successful}}
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{:ok, %{status: status}} ->
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{:error, "HTTP #{status}"}
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{:error, reason} ->
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{:error, reason}
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end
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end
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end
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