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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
-module(rebar_prv_update).
-behaviour(provider).
-export([init/1,
do/1,
format_error/1]).
-include("rebar.hrl").
-include_lib("providers/include/providers.hrl").
-define(PROVIDER, update).
-define(DEPS, []).
%% ===================================================================
%% Public API
%% ===================================================================
-spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
init(State) ->
State1 = rebar_state:add_provider(State, providers:create([{name, ?PROVIDER},
{module, ?MODULE},
{bare, false},
{deps, ?DEPS},
{example, "rebar3 update"},
{short_desc, "Update package index."},
{desc, "Update package index."},
{opts, []}])),
{ok, State1}.
-spec do(rebar_state:t()) -> {ok, rebar_state:t()} | {error, string()}.
do(State) ->
?INFO("Updating package index...", []),
try
Url = rebar_state:get(State, rebar_packages_cdn, "https://s3.amazonaws.com/s3.hex.pm/registry.ets.gz"),
TmpDir = ec_file:insecure_mkdtemp(),
TmpFile = filename:join(TmpDir, "packages.gz"),
HexFile = filename:join(TmpDir, "packages"),
{ok, _RequestId} = httpc:request(get, {Url, []},
[], [{stream, TmpFile}, {sync, true}]),
{ok, Data} = file:read_file(TmpFile),
Unzipped = zlib:gunzip(Data),
ok = file:write_file(HexFile, Unzipped),
{Dict, Graph} = hex_to_graph(HexFile),
write_registry(Dict, Graph, State),
ok
catch
_E:_C ->
throw(?PRV_ERROR(package_index_write))
end,
{ok, State}.
-spec format_error(any()) -> iolist().
format_error(package_index_write) ->
"Failed to write package index.".
write_registry(Dict, {digraph, Edges, Vertices, Neighbors, _}, State) ->
Dir = rebar_dir:global_cache_dir(State),
RegistryDir = filename:join(Dir, "packages"),
filelib:ensure_dir(filename:join(RegistryDir, "dummy")),
ets:tab2file(Edges, filename:join(RegistryDir, "edges")),
ets:tab2file(Vertices, filename:join(RegistryDir, "vertices")),
ets:tab2file(Neighbors, filename:join(RegistryDir, "neighbors")),
file:write_file(filename:join(RegistryDir, "dict"), term_to_binary(Dict)).
hex_to_graph(Filename) ->
{ok, T} = ets:file2tab(Filename),
Graph = digraph:new(),
ets:foldl(fun({Pkg, [Versions]}, ok) when is_binary(Pkg), is_list(Versions) ->
lists:foreach(fun(Version) ->
digraph:add_vertex(Graph, {Pkg, Version}, 1)
end, Versions);
(_, ok) ->
ok
end, ok, T),
Dict1 = ets:foldl(fun({{Pkg, PkgVsn}, [Deps | _]}, Dict) ->
DepsList = update_graph(Pkg, PkgVsn, Deps, T, Graph),
dict:store({Pkg, PkgVsn}, DepsList, Dict);
(_, Dict) ->
Dict
end, dict:new(), T),
{Dict1, Graph}.
update_graph(Pkg, PkgVsn, Deps, HexRegistry, Graph) ->
lists:foldl(fun([Dep, DepVsn, _, _], DepsListAcc) ->
case DepVsn of
<<"~> ", Vsn/binary>> ->
HighestDepVsn = find_highest_matching(Dep, Vsn, HexRegistry),
digraph:add_edge(Graph, {Pkg, PkgVsn}, {Dep, HighestDepVsn}),
[{Dep, DepVsn} | DepsListAcc];
Vsn ->
digraph:add_edge(Graph, {Pkg, PkgVsn}, {Dep, Vsn}),
[{Dep, Vsn} | DepsListAcc]
end
end, [], Deps).
%% Hex supports use of ~> to specify the version required for a dependency.
%% Since rebar3 requires exact versions to choose from we find the highest
%% available version of the dep that passes the constraint.
%% `~>` will never include pre-release versions of its upper bound.
%% It can also be used to set an upper bound on only the major
%% version part. See the table below for `~>` requirements and
%% their corresponding translation.
%% `~>` | Translation
%% :------------- | :---------------------
%% `~> 2.0.0` | `>= 2.0.0 and < 2.1.0`
%% `~> 2.1.2` | `>= 2.1.2 and < 2.2.0`
%% `~> 2.1.3-dev` | `>= 2.1.3-dev and < 2.2.0`
%% `~> 2.0` | `>= 2.0.0 and < 3.0.0`
%% `~> 2.1` | `>= 2.1.0 and < 3.0.0`
find_highest_matching(Dep, Constraint, T) ->
case ets:lookup(T, Dep) of
[{Dep, [[Vsn]]}] ->
case ec_semver:pes(Vsn, Constraint) of
true ->
Vsn;
false ->
?WARN("Only existing version of ~s is ~s which does not match constraint ~~> ~s. "
"Using anyway, but it is not guarenteed to work.", [Dep, Vsn, Constraint]),
Vsn
end;
[{Dep, [[HeadVsn | VsnTail]]}] ->
lists:foldl(fun(Version, Highest) ->
case ec_semver:pes(Version, Constraint) andalso
ec_semver:gt(Version, Highest) of
true ->
Version;
false ->
Highest
end
end, HeadVsn, VsnTail)
end.
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