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Event store using PostgreSQL for persistence.
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lib/event_store/storage/snapshot.ex
defmodule EventStore.Storage.Snapshot do
@moduledoc """
Record serialized snapshot data.
"""
require Logger
alias EventStore.Snapshots.SnapshotData
alias EventStore.Sql.Statements
alias EventStore.Storage.Snapshot
def read_snapshot(conn, source_uuid) do
Snapshot.QueryGetSnapshot.execute(conn, source_uuid)
end
def record_snapshot(conn, %SnapshotData{} = snapshot) do
Snapshot.RecordSnapshot.execute(conn, snapshot)
end
defmodule QueryGetSnapshot do
def execute(conn, source_uuid) do
conn
|> Postgrex.query(Statements.query_get_snapshot, [source_uuid])
|> handle_response
end
defp handle_response({:ok, %Postgrex.Result{num_rows: 0}}) do
{:error, :snapshot_not_found}
end
defp handle_response({:ok, %Postgrex.Result{rows: [row]}}) do
{:ok, to_snapshot_from_row(row)}
end
defp to_snapshot_from_row([source_uuid, source_version, source_type, data, metadata, created_at]) do
%SnapshotData{
source_uuid: source_uuid,
source_version: source_version,
source_type: source_type,
data: data,
metadata: metadata,
created_at: created_at
}
end
end
defmodule RecordSnapshot do
def execute(conn, %SnapshotData{source_uuid: source_uuid, source_version: source_version, source_type: source_type, data: data, metadata: metadata}) do
conn
|> Postgrex.query(Statements.record_snapshot, [source_uuid, source_version, source_type, data, metadata])
|> handle_response(source_uuid, source_version)
end
defp handle_response({:ok, _result}, _source_uuid, _source_version) do
:ok
end
defp handle_response({:error, error}, source_uuid, source_version) do
Logger.warn "failed to record snapshot for source \"#{source_uuid}\" at version \"#{source_version}\" due to: #{inspect error}"
{:error, error}
end
end
end