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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/storage/database.ex
defmodule EventStore.Storage.Database do
require Logger
def create(config) do
database = Keyword.fetch!(config, :database)
encoding = Keyword.get(config, :encoding, "UTF8")
{output, status} = run_with_psql(config, "CREATE DATABASE \"#{database}\" ENCODING='#{encoding}'")
cond do
status == 0 -> :ok
String.contains?(output, "42P04") -> {:error, :already_up}
true -> {:error, output}
end
end
def drop(config) do
database = Keyword.fetch!(config, :database)
{output, status} = run_with_psql(config, "DROP DATABASE \"#{database}\"")
cond do
status == 0 -> :ok
String.contains?(output, "3D000") -> {:error, :already_down}
true -> {:error, output}
end
end
defp run_with_psql(config, sql_command) do
unless System.find_executable("psql") do
raise "could not find executable `psql` in path, " <>
"please guarantee it is available before running event_store mix commands"
end
env =
if password = config[:password] do
[{"PGPASSWORD", password}]
else
[]
end
env = [{"PGCONNECT_TIMEOUT", "10"} | env]
args = []
args = case config[:username] do
nil -> args
username -> ["-U", username | args]
end
args = case config[:port] do
nil -> args
port -> ["-p", to_string(port) | args]
end
host = config[:hostname] || System.get_env("PGHOST") || "localhost"
args = args ++ ["--quiet",
"--host", host,
"--no-password",
"--set", "ON_ERROR_STOP=1",
"--set", "VERBOSITY=verbose",
"--no-psqlrc",
"-d", "template1",
"-c", sql_command]
System.cmd("psql", args, env: env, stderr_to_stdout: true)
end
end