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# Copyright 2019 Google LLC.
# SPDX-License-Identifier: Apache-2.0
#
# buildGo provides Nix functions to build Go packages in the style of Bazel's
# rules_go.
{ pkgs ? import <nixpkgs> {}
, ... }:
let
inherit (builtins)
attrNames
baseNameOf
elemAt
filter
map
match
readDir
replaceStrings
toPath;
inherit (pkgs) lib go runCommand fetchFromGitHub protobuf;
# Helpers for low-level Go compiler invocations
spaceOut = lib.concatStringsSep " ";
includeDepSrc = dep: "-I ${dep}";
includeSources = deps: spaceOut (map includeDepSrc deps);
includeDepLib = dep: "-L ${dep}";
includeLibs = deps: spaceOut (map includeDepLib deps);
srcBasename = src: elemAt (match "([a-z0-9]{32}\-)?(.*\.go)" (baseNameOf src)) 1;
srcCopy = path: src: "cp ${src} $out/${path}/${srcBasename src}";
srcList = path: srcs: lib.concatStringsSep "\n" (map (srcCopy path) srcs);
isGoFile = f: (match ".*\.go" f) != null;
isGoTest = f: (match ".*_test\.go" f) != null;
goFileFilter = k: v: (v == "regular") && (isGoFile k) && (!isGoTest k);
goFilesIn = dir:
let files = readDir dir;
goFiles = filter (f: goFileFilter f files."${f}") (attrNames files);
in map (f: dir + "/" + f) goFiles;
allDeps = deps: lib.unique (lib.flatten (deps ++ (map (d: d.goDeps) deps)));
# High-level build functions
# Build a Go program out of the specified files and dependencies.
program = { name, srcs, deps ? [] }:
let uniqueDeps = allDeps deps;
in runCommand name {} ''
${go}/bin/go tool compile -o ${name}.a -trimpath=$PWD -trimpath=${go} ${includeSources uniqueDeps} ${spaceOut srcs}
mkdir -p $out/bin
${go}/bin/go tool link -o $out/bin/${name} -buildid nix ${includeLibs uniqueDeps} ${name}.a
'';
# Build a Go library assembled out of the specified files.
#
# This outputs both the sources and compiled binary, as both are
# needed when downstream packages depend on it.
package = { name, srcs, deps ? [], path ? name }:
let uniqueDeps = allDeps deps;
in (runCommand "golib-${name}" {} ''
mkdir -p $out/${path}
${srcList path (map (s: "${s}") srcs)}
${go}/bin/go tool compile -o $out/${path}.a -trimpath=$PWD -trimpath=${go} -p ${path} ${includeSources uniqueDeps} ${spaceOut srcs}
'') // { goDeps = uniqueDeps; };
# Build a Go library out of the specified protobuf definition.
proto = { name, proto, path ? name, protocFlags ? "", extraDeps ? [] }: package {
inherit name path;
deps = [ goProto ] ++ extraDeps;
srcs = lib.singleton (runCommand "goproto-${name}.pb.go" {} ''
cp ${proto} ${baseNameOf proto}
${protobuf}/bin/protoc --plugin=${protocGo}/bin/protoc-gen-go \
--go_out=${protocFlags}import_path=${baseNameOf path}:. ${baseNameOf proto}
mv *.pb.go $out
'');
};
# Protobuf & gRPC integration requires these dependencies:
proto-go-src = fetchFromGitHub {
owner = "golang";
repo = "protobuf";
rev = "ed6926b37a637426117ccab59282c3839528a700";
sha256 = "0fynqrim022x9xi2bivkw19npbz4316v4yr7mb677s9s36z4dc4h";
};
protoPart = path: deps: package {
inherit deps;
name = replaceStrings ["/"] ["_"] path;
path = "github.com/golang/protobuf/${path}";
srcs = goFilesIn (toPath "${proto-go-src}/${path}");
};
goProto =
let
protobuf = package {
name = "protobuf";
path = "github.com/golang/protobuf/proto";
# TODO(tazjin): How does this build toggle work?
srcs = filter
(f: (match "(.*)/pointer_reflect.go" f) == null)
(goFilesIn (toPath "${proto-go-src}/proto"));
};
type = name: protoPart "ptypes/${name}" [ protobuf ];
descriptor = protoPart "descriptor" [ protobuf ];
ptypes = package {
name = "ptypes";
path = "github.com/golang/protobuf/ptypes";
srcs = goFilesIn (toPath "${proto-go-src}/ptypes");
deps = map type [
"any"
"duration"
"empty"
"struct"
"timestamp"
"wrappers"
];
};
in protobuf // { goDeps = allDeps (protobuf.goDeps ++ [ ptypes ]); };
protocDescriptor = (protoPart "protoc-gen-go/descriptor" [ goProto ]);
protocGo =
let
generator = protoPart "protoc-gen-go/generator" [
(protoPart "protoc-gen-go/generator/internal/remap" [])
(protoPart "protoc-gen-go/plugin" [ protocDescriptor ])
];
grpc = protoPart "protoc-gen-go/grpc" [ generator ];
in program {
name = "protoc-gen-go";
deps = [ goProto grpc generator ];
srcs = filter
(f: (match "(.*)/doc.go" f) == null)
(goFilesIn (toPath "${proto-go-src}/protoc-gen-go"));
};
in {
# Only the high-level builder functions are exposed
inherit program package proto;
}
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