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riptide
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A data first framework for building realtime applications
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lib/riptide/store/store_lmdb.ex
defmodule Riptide.Store.LMDB do
@moduledoc false
@behaviour Riptide.Store
@delimiter "×"
def init(directory: directory) do
{:ok, env} = Bridge.LMDB.open_env(directory)
Application.put_env(:riptide, {__MODULE__, directory}, env)
:ok
end
def env(directory: directory) do
Application.get_env(:riptide, {__MODULE__, directory})
end
def mutation(merges, deletes, opts) do
env = env(opts)
Bridge.LMDB.batch_write(
env,
Enum.map(merges, fn {path, value} ->
{encode_path(path), Jason.encode!(value)}
end),
Enum.flat_map(deletes, fn {path, _} ->
env
|> iterate(path, %{})
|> Enum.map(fn {path, _val} -> path end)
end)
)
end
def query(layers, opts) do
env = env(opts)
layers
|> Stream.map(fn {path, opts} ->
{
path,
env
|> iterate(path, opts)
|> Stream.map(fn {path, value} -> {decode_path(path), Jason.decode!(value)} end)
}
end)
end
def iterate(env, path, opts) do
combined = Enum.join(path, @delimiter)
{min, max} = Riptide.Store.Prefix.range(combined, opts)
min = Enum.join(min, @delimiter)
max = Enum.join(max, @delimiter)
{:ok, tx} = Bridge.LMDB.txn_read_new(env)
exact =
tx
|> Bridge.LMDB.get(min)
|> case do
{:ok, value} -> [{min, value}]
_ -> []
end
:ok = Bridge.LMDB.txn_read_abort(tx)
Stream.concat(
exact,
Bridge.LMDB.stream(env, min <> @delimiter, max)
)
end
def encode_path(path) do
Enum.join(path, @delimiter)
end
def decode_path(input) do
String.split(input, @delimiter)
end
end