1 files changed, 59 insertions, 0 deletions
diff --git a/go/tools/gopackagesdriver/json_packages_driver.go b/go/tools/gopackagesdriver/json_packages_driver.go
new file mode 100644
index 00000000..9bbf3408
--- /dev/null
+++ b/go/tools/gopackagesdriver/json_packages_driver.go
@@ -0,0 +1,59 @@
+// 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 (
+	"fmt"
+	"go/types"
+)
+
+type JSONPackagesDriver struct {
+	registry *PackageRegistry
+}
+
+func NewJSONPackagesDriver(jsonFiles []string, prf PathResolverFunc) (*JSONPackagesDriver, error) {
+	jpd := &JSONPackagesDriver{
+		registry: NewPackageRegistry(),
+	}
+
+	for _, f := range jsonFiles {
+		if err := WalkFlatPackagesFromJSON(f, func(pkg *FlatPackage) {
+			jpd.registry.Add(pkg)
+		}); err != nil {
+			return nil, fmt.Errorf("unable to walk json: %w", err)
+		}
+	}
+
+	if err := jpd.registry.ResolvePaths(prf); err != nil {
+		return nil, fmt.Errorf("unable to resolve paths: %w", err)
+	}
+
+	if err := jpd.registry.ResolveImports(); err != nil {
+		return nil, fmt.Errorf("unable to resolve paths: %w", err)
+	}
+
+	return jpd, nil
+}
+
+func (b *JSONPackagesDriver) GetResponse(labels []string) *driverResponse {
+	rootPkgs, packages := b.registry.Match(labels)
+
+	return &driverResponse{
+		NotHandled: false,
+		Sizes:      types.SizesFor("gc", "amd64").(*types.StdSizes),
+		Roots:      rootPkgs,
+		Packages:   packages,
+	}
+}