69 lines
2.0 KiB
Elixir
69 lines
2.0 KiB
Elixir
defmodule Backend.Api do
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alias Backend.{Crawl, Edge, Instance, Repo}
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import Ecto.Query
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@spec list_instances() :: [Instance.t()]
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def list_instances() do
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Instance
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|> Repo.all()
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end
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@spec get_instance!(String.t()) :: Instance.t()
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def get_instance!(domain) do
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Instance
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|> preload(:peers)
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|> Repo.get_by!(domain: domain)
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end
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@doc """
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Returns a list of instances that
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* have at least one successful crawl
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* have a user count (required to give the instance a size on the graph)
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"""
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@spec list_nodes() :: [Instance.t()]
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def list_nodes() do
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crawl_subquery =
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Crawl
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|> select([c], %{
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instance_domain: c.instance_domain,
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crawl_count: count(c.id)
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})
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|> where([c], is_nil(c.error))
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|> group_by([c], c.instance_domain)
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Instance
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|> join(:inner, [i], c in subquery(crawl_subquery), on: i.domain == c.instance_domain)
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|> where(
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[i, c],
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c.crawl_count > 0 and not is_nil(i.user_count) and not is_nil(i.x) and not is_nil(i.y)
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)
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|> select([c], [:domain, :user_count, :x, :y])
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|> Repo.all()
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end
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@spec list_edges() :: [Edge.t()]
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def list_edges() do
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crawl_subquery =
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Crawl
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|> select([c], %{
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instance_domain: c.instance_domain,
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crawl_count: count(c.id)
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})
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|> where([c], is_nil(c.error))
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|> group_by([c], c.instance_domain)
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Edge
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|> join(:inner, [e], c1 in subquery(crawl_subquery), on: e.source_domain == c1.instance_domain)
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|> join(:inner, [e], c2 in subquery(crawl_subquery), on: e.target_domain == c2.instance_domain)
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|> join(:inner, [e], i1 in Instance, on: e.source_domain == i1.domain)
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|> join(:inner, [e], i2 in Instance, on: e.target_domain == i2.domain)
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|> select([e], [:id, :source_domain, :target_domain, :weight])
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|> where(
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[e, c1, c2, i1, i2],
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c1.crawl_count > 0 and c2.crawl_count > 0 and not is_nil(i1.x) and not is_nil(i1.y) and
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not is_nil(i2.x) and not is_nil(i2.y) and e.source_domain != e.target_domain
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)
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|> Repo.all()
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end
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end
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