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Event store using PostgreSQL for persistence.
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lib/event_store/snapshots/snapshotter.ex
defmodule EventStore.Snapshots.Snapshotter do
@moduledoc """
Record and read snapshots of process state
"""
use GenServer
require Logger
alias EventStore.Snapshots.{SnapshotData,Snapshotter}
alias EventStore.Storage
defstruct serializer: nil
def start_link(serializer) do
GenServer.start_link(__MODULE__, %Snapshotter{
serializer: serializer
}, name: __MODULE__)
end
def init(%Snapshotter{} = state) do
{:ok, state}
end
@doc """
Read a snapshot, if available, for a given source
"""
def read_snapshot(source_uuid) do
GenServer.call(__MODULE__, {:read_snapshot, source_uuid})
end
@doc """
Record a snapshot of the data and metadata for a given source
Returns `:ok` on success
"""
def record_snapshot(%SnapshotData{} = snapshot) do
GenServer.call(__MODULE__, {:record_snapshot, snapshot})
end
def handle_call({:read_snapshot, source_uuid}, _from, %Snapshotter{serializer: serializer} = state) do
reply = case Storage.read_snapshot(source_uuid) do
{:ok, snapshot} -> {:ok, deserialize_snapshot(snapshot, serializer)}
reply -> reply
end
{:reply, reply, state}
end
def handle_call({:record_snapshot, %SnapshotData{} = snapshot}, _from, %Snapshotter{serializer: serializer} = state) do
reply =
snapshot
|> serialize_snapshot(serializer)
|> Storage.record_snapshot
{:reply, reply, state}
end
defp serialize_snapshot(%SnapshotData{data: data, metadata: metadata} = snapshot, serializer) do
%SnapshotData{snapshot |
data: serializer.serialize(data),
metadata: serializer.serialize(metadata)
}
end
defp deserialize_snapshot(%SnapshotData{source_type: source_type, data: data, metadata: metadata} = snapshot, serializer) do
%SnapshotData{snapshot |
data: serializer.deserialize(data, type: source_type),
metadata: serializer.deserialize(metadata, [])
}
end
end