index.community/backend/lib/graph/cache.ex

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2019-08-21 15:47:45 +00:00
defmodule Graph.Cache do
@moduledoc false
use Nebulex.Cache,
otp_app: :backend,
adapter: Nebulex.Adapters.Local
alias Backend.{Api, Crawl, Edge, Instance, MostRecentCrawl, Repo}
alias __MODULE__
require Logger
import Ecto.Query
@spec get_graph(String.t() | nil) :: %{
nodes: [Instance.t()],
edges: [Edge.t()]
}
def get_graph(domain \\ nil) do
key =
if domain != nil do
"graph_" <> domain
else
"graph"
end
case Cache.get(key) do
nil ->
Appsignal.increment_counter("graph_cache.misses", 1)
Logger.debug("Graph cache: miss")
nodes = Api.list_nodes(domain)
edges = Api.list_edges(domain)
# Cache for 10 minutes
Cache.set(key, %{nodes: nodes, edges: edges}, ttl: 600)
%{nodes: nodes, edges: edges}
data ->
Appsignal.increment_counter("graph_cache.hits", 1)
Logger.debug("Graph cache: hit")
data
end
end
@spec get_instance_with_peers(String.t()) :: Instance.t()
def get_instance_with_peers(domain) do
key = "instance_" <> domain
case Cache.get(key) do
nil ->
Appsignal.increment_counter("instance_cache.misses", 1)
Logger.debug("Instance cache: miss")
instance = Api.get_instance_with_peers(domain)
# Cache for one minute
Cache.set(key, instance, ttl: 60)
instance
data ->
Appsignal.increment_counter("instance_cache.hits", 1)
Logger.debug("Instance cache: hit")
data
end
end
@spec get_last_crawl(String.t()) :: Crawl.t() | nil
def get_last_crawl(domain) do
key = "most_recent_crawl_" <> domain
most_recent_crawl_subquery =
MostRecentCrawl
|> select([mrc], %{
most_recent_id: mrc.crawl_id
})
|> where([mrc], mrc.instance_domain == ^domain)
case Cache.get(key) do
nil ->
Appsignal.increment_counter("most_recent_crawl_cache.misses", 1)
Logger.debug("Most recent crawl cache: miss")
crawl =
Crawl
|> join(:inner, [c], mrc in subquery(most_recent_crawl_subquery),
on: c.id == mrc.most_recent_id
)
|> Repo.one()
# Cache for one minute
Cache.set(key, crawl, ttl: 60)
data ->
Appsignal.increment_counter("most_recent_crawl_cache.hits", 1)
Logger.debug("Most recent crawl cache: hit")
data
end
end
end