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Adding ability to query tenants from an Electric API
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| defmodule Electric.ControlPlane do | ||
| @moduledoc """ | ||
| Functions that interact with the control plane that exists outside Electric. | ||
| """ | ||
| require Logger | ||
|
|
||
| defstruct [ | ||
| :base_url, | ||
| :auth, | ||
| paths: %{ | ||
| "tenant_shape" => %{ | ||
| "url" => "/v1/shape", | ||
| "params" => %{ | ||
| "offset" => "-1", | ||
| "table" => "databases", | ||
| "where" => "electric_url ILIKE '%%{instance_id}'", | ||
| "select" => "id,connection_url" | ||
| } | ||
| } | ||
| } | ||
| ] | ||
|
|
||
| @type t() :: %__MODULE__{ | ||
| base_url: String.t(), | ||
| auth: nil | String.t() | {:basic, String.t()} | {:bearer, String.t()}, | ||
| paths: %{optional(String.t()) => map()} | ||
| } | ||
|
|
||
| @spec list_tenants(t(), keyword()) :: | ||
| {:ok, included :: list(map()), deleted :: list(map())} | {:error, :unreachable} | ||
| def list_tenants(%__MODULE__{} = plane, opts) do | ||
| %{electric_instance_id: instance_id} = | ||
| Keyword.get_lazy(opts, :app_config, fn -> Electric.Application.Configuration.get() end) | ||
|
|
||
| plane | ||
| |> build_req("tenant_shape", instance_id) | ||
| |> read_electric_api_until_done() | ||
| |> case do | ||
| {:ok, result} when is_list(result) -> | ||
| # We expect the control plane to fulfill the Electric API, so we can decode it here from the complete response | ||
| {ins_acc, del_acc} = | ||
| result | ||
| |> Stream.reject(&get_in(&1, ["headers", "control"])) | ||
| |> Stream.map( | ||
| &{get_in(&1, ["headers", "operation"]), Map.fetch!(&1, "key"), | ||
| Map.fetch!(&1, "value")} | ||
| ) | ||
| |> collect_ops() | ||
|
|
||
| {:ok, Map.values(ins_acc), Map.values(del_acc)} | ||
|
|
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| {:ok, %Req.Response{status: status, body: body}} -> | ||
| Logger.error( | ||
| "Could not reach the control plane while trying to list tenants. Latest response has status #{status} and body #{inspect(body)}" | ||
| ) | ||
|
|
||
| {:error, :unreachable} | ||
|
|
||
| {:error, error} -> | ||
| Logger.error( | ||
| "Could not reach the control plane while trying to list tenants. Latest response was #{inspect(error)}" | ||
| ) | ||
|
|
||
| {:error, :unreachable} | ||
| end | ||
| end | ||
|
|
||
| # We need to read the Electric stream until complete | ||
| defp read_electric_api_until_done(req, agg \\ []) do | ||
| with {:ok, %Req.Response{status: 200} = resp} <- | ||
| Req.get(req, max_retries: 4, retry_delay: 1_000) do | ||
| if Req.Response.get_header(resp, "electric-up-to-date") != [] do | ||
| {:ok, agg ++ resp.body} | ||
| else | ||
| [electric_handle] = Req.Response.get_header(resp, "electric-handle") | ||
| [electric_offset] = Req.Response.get_header(resp, "electric-offset") | ||
|
|
||
| req | ||
| |> Req.merge(params: [handle: electric_handle, offset: electric_offset]) | ||
| |> read_electric_api_until_done(agg ++ resp.body) | ||
| end | ||
| end | ||
| end | ||
|
|
||
| defp build_req(%__MODULE__{} = plane, path_name, instance_id) do | ||
| %{"url" => url} = path_spec = Map.fetch!(plane.paths, path_name) | ||
| url = insert_instance_id(url, instance_id) | ||
|
|
||
| params = | ||
| path_spec | ||
| |> Map.get("params", []) | ||
| |> Enum.map(fn {k, v} -> {k, insert_instance_id(v, instance_id)} end) | ||
|
|
||
| headers = | ||
| path_spec | ||
| |> Map.get("headers", []) | ||
| |> Enum.map(fn {k, v} -> {k, insert_instance_id(v, instance_id)} end) | ||
|
|
||
| Req.new( | ||
| base_url: plane.base_url, | ||
| url: url, | ||
| params: params, | ||
| auth: plane.auth, | ||
| headers: headers | ||
| ) | ||
| end | ||
|
|
||
| defp insert_instance_id(string, instance_id), | ||
| do: String.replace(string, "%{instance_id}", instance_id) | ||
|
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||
| @spec collect_ops(list({String.t(), String.t(), %{String.t() => String.t()}})) :: | ||
| {map(), map()} | ||
| defp collect_ops(ops) do | ||
| Enum.reduce(ops, {%{}, %{}}, fn | ||
| {"insert", key, value}, {ins_acc, del_acc} -> | ||
| {Map.put(ins_acc, key, value), del_acc} | ||
|
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| {"update", key, value}, {ins_acc, del_acc} -> | ||
| {Map.update!(ins_acc, key, &Map.merge(&1, value)), del_acc} | ||
|
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||
| {"delete", key, value}, {ins_acc, del_acc} -> | ||
| {Map.delete(ins_acc, key), Map.put(del_acc, key, value)} | ||
| end) | ||
| end | ||
| end |
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