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defmodule ExPrometheusIo.Query do
def process(query, query_opts, query_ref, owner) do
build_url(query, query_opts)
|> URI.encode
|> fetch_json()
|> Poison.decode
|> send_results(query_ref, owner)
end
@http Application.get_env(:ex_prometheus_io, :http_client) || :httpc
defp fetch_json(uri) do
{:ok, {_, _, body}} = @http.request(uri |> String.to_char_list())
body
end
def endpoint(:query), do: build_endpoint("query")
def endpoint(:range), do: build_endpoint("query_range")
def endpoint(:series), do: build_endpoint("series")
defp build_endpoint(endpoint) do
"http://" <> prometheus_host <> "/api/v1/#{endpoint}"
end
def build_url(query, opts) when query in [:query, :range, :series] do
endpoint(query) <> "?" <> query_params(query, opts)
end
def query_params(:query, query_parameter) do
query_time = :os.system_time(:seconds)
"query=#{query_parameter}&time=#{query_time}"
end
def query_params(:range, {topic, start_ts, end_ts, step}) do
"query=#{topic}"
<> "&start=#{start_ts}"
<> "&end=#{end_ts}"
<> "&step=#{step}"
end
def query_params(:series, {matches}) when is_list(matches) do
matches
|> Enum.map(fn(match) -> "match[]=#{match}" end)
|> Enum.join("&")
end
defp send_results({:error, :invalid} = results, query_ref, owner) do
send(owner, {:prometheus_results, query_ref, results})
end
defp send_results(
{:ok, %{"status" => "success", "data" => results}}, query_ref, owner) do
send(owner, {:prometheus_results, query_ref, results})
end
defp send_results({:ok, %{"error" => message}}, query_ref, owner) do
send(owner, {:prometheus_results, query_ref, {:error, message}})
end
defp prometheus_host do
Application.fetch_env!(:ex_prometheus_io, :hostname)
end
end
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