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ExESDB is a reincarnation of rabbitmq/khepri, specialized for use as a BEAM-native event store.
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Files
lib/ex_esdb/store_worker.ex
defmodule ExESDB.StoreWorker do
@moduledoc """
A GenServer wrapper around :khepri to act as a distributed event store.
Inspired by EventStoreDB's API.
"""
use GenServer
require Logger
alias ExESDB.Themes, as: Themes
alias ExESDB.StoreNaming
defp start_khepri(opts) do
store = opts[:store_id]
timeout = opts[:timeout]
data_dir = opts[:data_dir]
:khepri.start(data_dir, store, timeout)
end
# Client API
@doc """
Get the current state of the store.
## Returns
- `{:ok, state}` if successful.
- `{:error, reason}` if unsuccessful.
"""
def get_state(store_id \\ nil),
do:
GenServer.call(
StoreNaming.genserver_name(__MODULE__, store_id),
{:get_state}
)
## CALLBACKS
@impl true
def handle_call({:get_state}, _from, state) do
{:reply, {:ok, state}, state}
end
#### PLUMBING
def child_spec(opts) do
store_id = StoreNaming.extract_store_id(opts)
%{
id: StoreNaming.child_spec_id(__MODULE__, store_id),
start: {__MODULE__, :start_link, [opts]},
restart: :permanent,
shutdown: 10_000,
type: :worker
}
end
def start_link(opts) do
store_id = StoreNaming.extract_store_id(opts)
name = StoreNaming.genserver_name(__MODULE__, store_id)
GenServer.start_link(
__MODULE__,
opts,
name: name
)
end
# Server Callbacks
@impl true
def init(opts) do
IO.puts(Themes.store(self(), "is UP."))
Process.flag(:trap_exit, true)
case start_khepri(opts) do
{:ok, store} ->
Logger.debug("Started store: #{inspect(store)}")
{:ok, [config: opts, store: store]}
reason ->
Logger.error("Failed to start khepri. reason: #{inspect(reason)}")
{:error, [config: opts, store: nil]}
end
end
@impl true
def terminate(reason, [config: opts, store: store]) do
IO.puts(Themes.store(self(), "⚠️ Shutting down gracefully. Reason: #{inspect(reason)}"))
# Stop Khepri store gracefully if it was started
if store do
store_id = opts[:store_id]
Logger.info("Stopping Khepri store: #{inspect(store_id)}")
case :khepri.stop(store_id) do
:ok ->
Logger.info("Successfully stopped Khepri store: #{inspect(store_id)}")
{:error, reason} ->
Logger.warning("Failed to stop Khepri store #{inspect(store_id)}: #{inspect(reason)}")
other ->
Logger.warning("Unexpected response stopping Khepri store #{inspect(store_id)}: #{inspect(other)}")
end
end
:ok
end
def terminate(reason, _state) do
IO.puts(Themes.store(self(), "⚠️ Shutting down gracefully. Reason: #{inspect(reason)}"))
:ok
end
end