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eventstore
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Event store using PostgreSQL for persistence.
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Files
lib/event_store/storage/create_stream.ex
defmodule EventStore.Storage.CreateStream do
@moduledoc false
require Logger
alias EventStore.Sql.Statements
def execute(conn, stream_uuid, opts) do
Logger.debug("Attempting to create stream #{stream_uuid}")
{schema, opts} = Keyword.pop(opts, :schema)
conn
|> Postgrex.query(Statements.create_stream(schema), [stream_uuid], opts)
|> handle_response(stream_uuid)
end
defp handle_response({:ok, %Postgrex.Result{rows: [[stream_id]]}}, stream_uuid) do
Logger.debug(fn -> "Created stream #{inspect(stream_uuid)} (id: #{stream_id})" end)
{:ok, stream_id}
end
defp handle_response(
{:error, %Postgrex.Error{postgres: %{code: :unique_violation}}},
stream_uuid
) do
Logger.warn("Failed to create stream #{inspect(stream_uuid)}, already exists")
{:error, :stream_exists}
end
defp handle_response({:error, error}, stream_uuid) do
Logger.warn("Failed to create stream #{inspect(stream_uuid)} due to: " <> inspect(error))
{:error, error}
end
end