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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 false
require Logger
alias EventStore.Snapshots.SnapshotData
alias EventStore.Sql.Statements
def read_snapshot(conn, source_uuid, opts) do
{schema, opts} = Keyword.pop(opts, :schema)
query = Statements.query_snapshot(schema)
case Postgrex.query(conn, query, [source_uuid], opts) do
{:ok, %Postgrex.Result{num_rows: 0}} ->
{:error, :snapshot_not_found}
{:ok, %Postgrex.Result{rows: [row]}} ->
{:ok, to_snapshot_from_row(row)}
{:error, error} = reply ->
Logger.warning(fn ->
"Failed to read snapshot for source \"#{source_uuid}\" due to: #{inspect(error)}"
end)
reply
end
end
def record_snapshot(conn, %SnapshotData{} = snapshot, opts) do
%SnapshotData{
source_uuid: source_uuid,
source_version: source_version,
source_type: source_type,
data: data,
metadata: metadata
} = snapshot
{schema, opts} = Keyword.pop(opts, :schema)
query = Statements.insert_snapshot(schema)
params = [source_uuid, source_version, source_type, data, metadata]
case Postgrex.query(conn, query, params, opts) do
{:ok, _result} ->
:ok
{:error, error} = reply ->
Logger.warning(
"Failed to record snapshot for source \"#{source_uuid}\" at version \"#{source_version}\" due to: " <>
inspect(error)
)
reply
end
end
def delete_snapshot(conn, source_uuid, opts) do
{schema, opts} = Keyword.pop(opts, :schema)
query = Statements.delete_snapshot(schema)
case Postgrex.query(conn, query, [source_uuid], opts) do
{:ok, _result} ->
:ok
{:error, error} = reply ->
Logger.warning(
"Failed to delete snapshot for source \"#{source_uuid}\" due to: " <> inspect(error)
)
reply
end
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