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Marc Nijdam 2019-12-15 07:14:42 -04:00
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.rebar3
_*
.eunit
*.o
*.beam
*.plt
*.swp
*.swo
.erlang.cookie
ebin
log
erl_crash.dump
.rebar
logs
_build
.idea
*.iml
rebar3.crashdump
.DS_Store
.env

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CONTRIBUTING.md Normal file
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### How to Contribute to this repository
We value contributions from the community and will do everything we
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our way or a bug to report:
* **Contributing Code**: If you have new code or a bug fix, fork this
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* **Reporting Bugs**: Open an issue [against this
repo](https://github.com/helium/blockchain-api/issues) with as
much detail as you can. At the very least you'll include steps to
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This project is intended to be a safe, welcoming space for
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[Contributor Covenant Code of
Conduct](http://contributor-covenant.org/).
Above all, thank you for taking the time to be a part of the Helium
community.

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.PHONY: compile
REBAR=./rebar3
compile:
$(REBAR) escriptize
typecheck:
$(REBAR) do dialyzer,xref
clean:
$(REBAR) clean

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README.md Normal file
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psql_migration
=====
An escript to help with Postgres migrations.
This is inspired by the similarly named [pgsql_migration](https://github.com/artemeff/pgsql_migration) and the excellent tooling offered by [diesel](http://diesel.rs).
Build
-----
$ ./rebar3 escriptize
Run
---
The script will look for a `DATABASE_URL` environment variable for connectivity details a running Postgres and suports `.env` file to hold that variable.
Run the script with:
$ _build/default/bin/psql_migration
See the help output for more details on options and commands.

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{erl_opts,
[
debug_info,
warnings_as_errors
]}.
{deps,
[
{envloader, {git, "https://github.com/nuex/envloader.git", {branch, "master"}}},
{eql, {git, "git://github.com/artemeff/eql.git", {tag, "0.1.0"}}},
getopt,
epgsql
]}.
{escript_incl_apps, [psql_migration]}.
{escript_main_app, psql_migration}.
{escript_name, psql_migration}.
{escript_emu_args, "%%! +sbtu +A1\n"}.
%% Profiles
{profiles, [{test,
[{erl_opts, [debug_info]}
]}]}.

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{"1.1.0",
[{<<"envloader">>,
{git,"https://github.com/nuex/envloader.git",
{ref,"27a97e04f35c554995467b9236d8ae0188d468c7"}},
0},
{<<"epgsql">>,{pkg,<<"epgsql">>,<<"4.3.0">>},0},
{<<"eql">>,
{git,"git://github.com/artemeff/eql.git",
{ref,"a6727a3f878bfdd06648b7a886cbd2c0630db172"}},
0},
{<<"getopt">>,{pkg,<<"getopt">>,<<"1.0.1">>},0}]}.
[
{pkg_hash,[
{<<"epgsql">>, <<"26D9CF04D74773D1DC4DA24AD39E926B34E107232591FE1866EFDFBC0A098396">>},
{<<"getopt">>, <<"C73A9FA687B217F2FF79F68A3B637711BB1936E712B521D8CE466B29CBF7808A">>}]}
].

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{application, psql_migration,
[{description, "A script to manage Postgres migrations"},
{vsn, "0.1.0"},
{registered, []},
{applications,
[kernel,
stdlib,
getopt,
epgsql,
eql,
envloader
]},
{env,[]},
{modules, []},
{licenses, ["Apache 2.0"]},
{links, []}
]}.

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-module(psql_migration).
%% API exports
-export([main/1]).
%%====================================================================
%% API functions
%%====================================================================
-define(OPTS,
[
{help, $h, "help", undefined, "Print this help text"},
{dir, $d, "dir", {string, "migrations"}, "Migration folder"},
{env, $e, "env", {string, ".env"}, "Environment file to search for DATABASE_URL"}
]).
%% escript Entry point
main(Args) ->
handle_command(getopt:parse(?OPTS, Args)).
usage(ExitCode) ->
getopt:usage(?OPTS, "psql_migration",
"<command>",
[
{"new <name>", "Create a new migration"},
{"list", "List migrations indicating which have been applied"},
{"run", "Run all migrations"},
{"revert", "Revert the last migration"}
]),
halt(ExitCode).
handle_command({error, Error}) ->
io:format("~p~n~n", [Error]),
usage(1);
handle_command({ok, {[help | _], _}}) ->
usage(0);
handle_command({ok, {Args, ["list"]}}) ->
Applied = applied_migrations(Args),
Available = available_migrations(Args),
IsApplied = fun(Mig) ->
case lists:member(Mig, Applied) of
true -> "X";
_ -> " "
end
end,
io:format("Migrations:~n"),
[io:format(" [~s] ~s~n", [IsApplied(Entry), Entry]) || {Entry, _} <- Available];
handle_command({ok, {Args, ["new", Name]}}) ->
Dir = target_dir(Args),
Timestamp = erlang:system_time(seconds),
MigrationName = [integer_to_list(Timestamp), "-", Name, ".sql"],
Filename = filename:join(Dir, MigrationName),
C = ["-- ", Filename, "\n",
"-- :up\n",
"-- Up migration\n\n",
"-- :down\n",
"-- Down migration\n"
],
file:write_file(Filename, list_to_binary(C), [exclusive]),
io:format("Created migration: ~s~n", [Filename]);
handle_command({ok, {Args, ["run"]}}) ->
Available = available_migrations(Args),
case open_connection(Args) of
{ok, Conn} ->
Applied = applied_migrations(Conn),
ToApply = lists:filter(fun ({Mig, _}) -> not lists:member(Mig, Applied) end, Available),
Results = apply_migrations(up, ToApply, Conn),
report_migrations(up, Results);
{error, Error} ->
io:format("Failed to connect to database: ~p~n", [Error]),
halt(1)
end;
handle_command({ok, {Args, ["revert"]}}) ->
Available = available_migrations(Args),
case open_connection(Args) of
{ok, Conn} ->
case applied_migrations(Conn) of
[] ->
io:format("No applied migrations to revert"),
halt(1);
Applied ->
LastApplied = lists:last(Applied),
case lists:keyfind(LastApplied, 1, Available) of
false ->
io:format("Migration ~p can not be found~n", [LastApplied]),
halt(1);
Migration ->
Results = apply_migrations(down, [Migration], Conn),
report_migrations(down, Results)
end
end;
{error, Error} ->
io:format("Failed to connect to database: ~p~n", [Error]),
halt(1)
end;
handle_command({ok, {_, _}}) ->
usage(1).
%% Utils
open_connection(Args) ->
envloader:load(dot_env(Args)),
URL = os:getenv("DATABASE_URL"),
ParseOpts = [{scheme_defaults, [{postgres, 5432}]}],
case http_uri:parse(URL, ParseOpts) of
{error, Error} ->
{error, Error};
{ok, {postgres, UserPass, Host, Port, Database, _}} ->
[User, Pass] = string:split(UserPass, ":"),
OpenOpts = #{ port => Port,
database => string:slice(Database, 1)},
epgsql:connect(Host, User, Pass, OpenOpts);
{ok, {Schema, _, _, _, _, _}} ->
{error, {unsupported_schema, Schema}}
end.
target_dir(Args) ->
case lists:keyfind(dir, 1, Args) of
false -> ".";
{dir, Dir} ->
filelib:ensure_dir(Dir),
Dir
end.
dot_env(Args) ->
case lists:keyfind(env, 1, Args) of
false -> ".env";
{env, DotEnv} -> DotEnv
end.
-spec report_migrations(up | down, [{Version::string(), ok | {error, term()}}]) -> ok.
report_migrations(_, L) when length(L) == 0 ->
io:format("No migrations were run~n");
report_migrations(up, Results) ->
[io:format("Applied ~s: ~p~n", [V, R]) || {V, R} <- Results];
report_migrations(down, Results) ->
[io:format("Reverted ~s: ~p~n", [V, R]) || {V, R} <- Results].
-define(DRIVER, epgsql).
record_migration(up, Conn, V) ->
?DRIVER:equery(Conn, "INSERT INTO __migrations (id) VALUES ($1)", [V]);
record_migration(down, Conn, V) ->
?DRIVER:equery(Conn, "DELETE FROM __migrations WHERE id = $1", [V]).
apply_migrations(Type, Migrations, Conn) ->
Results = lists:foldl(fun(_, [{_, {error, _}} | _]=Acc) ->
Acc;
(Migration={Version, _}, Acc) ->
case apply_migration(Type, Migration, Conn) of
ok -> [{Version, ok} | Acc];
{error, Error} -> [{Version, {error, Error}}]
end
end, [], Migrations),
lists:reverse(Results).
apply_migration(Type, {Version, Migration}, Conn) ->
Query = eql:get_query(Type, Migration),
?DRIVER:squery(Conn, "BEGIN;"),
case if_ok(?DRIVER:squery(Conn, Query)) of
ok ->
record_migration(Type, Conn, Version),
?DRIVER:squery(Conn, "COMMIT;"),
ok;
{error, Error} ->
?DRIVER:squery(Conn, "ROLLBACK;"),
{error, Error}
end.
if_ok(Rs) when is_list(Rs) ->
Result = lists:map(fun(R) -> if_ok(R) end, Rs),
case lists:keyfind(error, 1, Result) of
false -> ok;
Error -> Error
end;
if_ok({ok, _}) -> ok;
if_ok({ok, _, _}) -> ok;
if_ok({ok, _, _, _}) -> ok;
if_ok({error, {error,error,_,_,Descr,_}}) -> {error, Descr};
if_ok(Error) -> {error, Error}.
available_migrations(Args) ->
Dir = target_dir(Args),
{ok, Files} = file:list_dir(Dir),
lists:map(fun(Filename) ->
{ok, Migs} = eql:compile(filename:join([Dir, Filename])),
{filename:rootname(Filename), Migs}
end, lists:usort(Files)).
applied_migrations(Args) when is_list(Args) ->
case open_connection(Args) of
{ok, Conn} ->
applied_migrations(Conn);
{error, Error} ->
{error, Error}
end;
applied_migrations(Conn) ->
case ?DRIVER:squery(Conn, "SELECT id FROM __migrations ORDER by id ASC") of
{ok, _, Migs} -> [binary_to_list(Mig) || {Mig} <- Migs];
{error, {error, error, <<"42P01">>, _, _, _}} ->
%% init migrations and restart
{ok, _, _} = ?DRIVER:squery(Conn,
"CREATE TABLE __migrations ("
"id VARCHAR(255) PRIMARY KEY,"
"datetime TIMESTAMP DEFAULT CURRENT_TIMESTAMP)"),
applied_migrations(Conn)
end.