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// Copyright 2021 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"encoding/json"
"fmt"
"go/types"
"os"
"strings"
)
type driverResponse struct {
// NotHandled is returned if the request can't be handled by the current
// driver. If an external driver returns a response with NotHandled, the
// rest of the driverResponse is ignored, and go/packages will fallback
// to the next driver. If go/packages is extended in the future to support
// lists of multiple drivers, go/packages will fall back to the next driver.
NotHandled bool
// Sizes, if not nil, is the types.Sizes to use when type checking.
Sizes *types.StdSizes
// Roots is the set of package IDs that make up the root packages.
// We have to encode this separately because when we encode a single package
// we cannot know if it is one of the roots as that requires knowledge of the
// graph it is part of.
Roots []string `json:",omitempty"`
// Packages is the full set of packages in the graph.
// The packages are not connected into a graph.
// The Imports if populated will be stubs that only have their ID set.
// Imports will be connected and then type and syntax information added in a
// later pass (see refine).
Packages []*FlatPackage
}
var (
// Injected via x_defs.
rulesGoRepositoryName string
goDefaultAspect = rulesGoRepositoryName + "//go/tools/gopackagesdriver:aspect.bzl%go_pkg_info_aspect"
bazelBin = getenvDefault("GOPACKAGESDRIVER_BAZEL", "bazel")
bazelStartupFlags = strings.Fields(os.Getenv("GOPACKAGESDRIVER_BAZEL_FLAGS"))
bazelQueryFlags = strings.Fields(os.Getenv("GOPACKAGESDRIVER_BAZEL_QUERY_FLAGS"))
bazelQueryScope = getenvDefault("GOPACKAGESDRIVER_BAZEL_QUERY_SCOPE", "")
bazelBuildFlags = strings.Fields(os.Getenv("GOPACKAGESDRIVER_BAZEL_BUILD_FLAGS"))
workspaceRoot = os.Getenv("BUILD_WORKSPACE_DIRECTORY")
additionalAspects = strings.Fields(os.Getenv("GOPACKAGESDRIVER_BAZEL_ADDTL_ASPECTS"))
additionalKinds = strings.Fields(os.Getenv("GOPACKAGESDRIVER_BAZEL_KINDS"))
emptyResponse = &driverResponse{
NotHandled: true,
Sizes: types.SizesFor("gc", "amd64").(*types.StdSizes),
Roots: []string{},
Packages: []*FlatPackage{},
}
)
func run() (*driverResponse, error) {
ctx, cancel := signalContext(context.Background(), os.Interrupt)
defer cancel()
queries := os.Args[1:]
request, err := ReadDriverRequest(os.Stdin)
if err != nil {
return emptyResponse, fmt.Errorf("unable to read request: %w", err)
}
bazel, err := NewBazel(ctx, bazelBin, workspaceRoot, bazelStartupFlags)
if err != nil {
return emptyResponse, fmt.Errorf("unable to create bazel instance: %w", err)
}
bazelJsonBuilder, err := NewBazelJSONBuilder(bazel, request.Tests)
if err != nil {
return emptyResponse, fmt.Errorf("unable to build JSON files: %w", err)
}
labels, err := bazelJsonBuilder.Labels(ctx, queries)
if err != nil {
return emptyResponse, fmt.Errorf("unable to lookup package: %w", err)
}
jsonFiles, err := bazelJsonBuilder.Build(ctx, labels, request.Mode)
if err != nil {
return emptyResponse, fmt.Errorf("unable to build JSON files: %w", err)
}
driver, err := NewJSONPackagesDriver(jsonFiles, bazelJsonBuilder.PathResolver())
if err != nil {
return emptyResponse, fmt.Errorf("unable to load JSON files: %w", err)
}
// Note: we are returning all files required to build a specific package.
// For file queries (`file=`), this means that the CompiledGoFiles will
// include more than the only file being specified.
return driver.GetResponse(labels), nil
}
func main() {
response, err := run()
if err := json.NewEncoder(os.Stdout).Encode(response); err != nil {
fmt.Fprintf(os.Stderr, "unable to encode response: %v", err)
}
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v", err)
// gopls will check the packages driver exit code, and if there is an
// error, it will fall back to go list. Obviously we don't want that,
// so force a 0 exit code.
os.Exit(0)
}
}
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