1 files changed, 300 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/go.uber.org/atomic@v1.7.0/internal/gen-atomicwrapper/main.go b/dependencies/pkg/mod/go.uber.org/atomic@v1.7.0/internal/gen-atomicwrapper/main.go
new file mode 100644
index 0000000..862c411
--- /dev/null
+++ b/dependencies/pkg/mod/go.uber.org/atomic@v1.7.0/internal/gen-atomicwrapper/main.go
@@ -0,0 +1,300 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+// gen-atomicwrapper generates wrapper types around other atomic types.
+//
+// It supports plugging in functions which convert the value inside the atomic
+// type to the user-facing value. For example,
+//
+// Given, atomic.Value and the functions,
+//
+//  func packString(string) interface{}
+//  func unpackString(interface{}) string
+//
+// We can run the following command:
+//
+//  gen-atomicwrapper -name String -wrapped Value \
+//    -type string -pack fromString -unpack tostring
+//
+// This wil generate approximately,
+//
+//  type String struct{ v Value }
+//
+//  func (s *String) Load() string {
+//    return unpackString(v.Load())
+//  }
+//
+//  func (s *String) Store(s string) {
+//    return s.v.Store(packString(s))
+//  }
+//
+// The packing/unpacking logic allows the stored value to be different from
+// the user-facing value.
+//
+// Without -pack and -unpack, the output will be cast to the target type,
+// defaulting to the zero value.
+package main
+
+import (
+	"bytes"
+	"errors"
+	"flag"
+	"fmt"
+	"go/format"
+	"io"
+	"log"
+	"os"
+	"sort"
+	"strings"
+	"text/template"
+)
+
+func main() {
+	log.SetFlags(0)
+	if err := run(os.Args[1:]); err != nil {
+		log.Fatalf("%+v", err)
+	}
+}
+
+type stringList []string
+
+func (sl *stringList) String() string {
+	return strings.Join(*sl, ",")
+}
+
+func (sl *stringList) Set(s string) error {
+	for _, i := range strings.Split(s, ",") {
+		*sl = append(*sl, strings.TrimSpace(i))
+	}
+	return nil
+}
+
+func run(args []string) error {
+	var opts struct {
+		Name    string
+		Wrapped string
+		Type    string
+
+		Imports      stringList
+		Pack, Unpack string
+
+		CAS  bool
+		Swap bool
+		JSON bool
+
+		File string
+	}
+
+	flag := flag.NewFlagSet("gen-atomicwrapper", flag.ContinueOnError)
+
+	// Required flags
+	flag.StringVar(&opts.Name, "name", "",
+		"name of the generated type (e.g. Duration)")
+	flag.StringVar(&opts.Wrapped, "wrapped", "",
+		"name of the wrapped atomic (e.g. Int64)")
+	flag.StringVar(&opts.Type, "type", "",
+		"name of the type exposed by the atomic (e.g. time.Duration)")
+
+	// Optional flags
+	flag.Var(&opts.Imports, "imports",
+		"comma separated list of imports to add")
+	flag.StringVar(&opts.Pack, "pack", "",
+		"function to transform values with before storage")
+	flag.StringVar(&opts.Unpack, "unpack", "",
+		"function to reverse packing on loading")
+	flag.StringVar(&opts.File, "file", "",
+		"output file path (default: stdout)")
+
+	// Switches for individual methods. Underlying atomics must support
+	// these.
+	flag.BoolVar(&opts.CAS, "cas", false,
+		"generate a `CAS(old, new) bool` method; requires -pack")
+	flag.BoolVar(&opts.Swap, "swap", false,
+		"generate a `Swap(new) old` method; requires -pack and -unpack")
+	flag.BoolVar(&opts.JSON, "json", false,
+		"generate `MarshalJSON/UnmarshJSON` methods")
+
+	if err := flag.Parse(args); err != nil {
+		return err
+	}
+
+	if len(opts.Name) == 0 || len(opts.Wrapped) == 0 || len(opts.Type) == 0 {
+		return errors.New("flags -name, -wrapped, and -type are required")
+	}
+
+	if (len(opts.Pack) == 0) != (len(opts.Unpack) == 0) {
+		return errors.New("either both, or neither of -pack and -unpack must be specified")
+	}
+
+	if opts.CAS && len(opts.Pack) == 0 {
+		return errors.New("flag -cas requires -pack")
+	}
+
+	if opts.Swap && len(opts.Pack) == 0 {
+		return errors.New("flag -swap requires -pack and -unpack")
+	}
+
+	var w io.Writer = os.Stdout
+	if file := opts.File; len(file) > 0 {
+		f, err := os.Create(file)
+		if err != nil {
+			return fmt.Errorf("create %q: %v", file, err)
+		}
+		defer f.Close()
+
+		w = f
+	}
+
+	// Import encoding/json if needed.
+	if opts.JSON {
+		found := false
+		for _, imp := range opts.Imports {
+			if imp == "encoding/json" {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			opts.Imports = append(opts.Imports, "encoding/json")
+		}
+	}
+
+	sort.Strings([]string(opts.Imports))
+
+	var buff bytes.Buffer
+	if err := _tmpl.Execute(&buff, opts); err != nil {
+		return fmt.Errorf("render template: %v", err)
+	}
+
+	bs, err := format.Source(buff.Bytes())
+	if err != nil {
+		return fmt.Errorf("reformat source: %v", err)
+	}
+
+	_, err = w.Write(bs)
+	return err
+}
+
+var _tmpl = template.Must(template.New("int.go").Parse(`// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package atomic
+
+{{ with .Imports }}
+import (
+	{{ range . -}}
+		{{ printf "%q" . }}
+	{{ end }}
+)
+{{ end }}
+
+// {{ .Name }} is an atomic type-safe wrapper for {{ .Type }} values.
+type {{ .Name }} struct{
+	_ nocmp // disallow non-atomic comparison
+
+	v {{ .Wrapped }}
+}
+
+var _zero{{ .Name }} {{ .Type }}
+
+
+// New{{ .Name }} creates a new {{ .Name }}.
+func New{{ .Name}}(v {{ .Type }}) *{{ .Name }} {
+	x := &{{ .Name }}{}
+	if v != _zero{{ .Name }} {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped {{ .Type }}.
+func (x *{{ .Name }}) Load() {{ .Type }} {
+	{{ if .Unpack -}}
+		return {{ .Unpack }}(x.v.Load())
+	{{- else -}}
+		if v := x.v.Load(); v != nil {
+			return v.({{ .Type }})
+		}
+		return _zero{{ .Name }}
+	{{- end }}
+}
+
+// Store atomically stores the passed {{ .Type }}.
+func (x *{{ .Name }}) Store(v {{ .Type }}) {
+	{{ if .Pack -}}
+		x.v.Store({{ .Pack }}(v))
+	{{- else -}}
+		x.v.Store(v)
+	{{- end }}
+}
+
+{{ if .CAS -}}
+	// CAS is an atomic compare-and-swap for {{ .Type }} values.
+	func (x *{{ .Name }}) CAS(o, n {{ .Type }}) bool {
+		return x.v.CAS({{ .Pack }}(o), {{ .Pack }}(n))
+	}
+{{- end }}
+
+{{ if .Swap -}}
+	// Swap atomically stores the given {{ .Type }} and returns the old
+	// value.
+	func (x *{{ .Name }}) Swap(o {{ .Type }}) {{ .Type }} {
+		return {{ .Unpack }}(x.v.Swap({{ .Pack }}(o)))
+	}
+{{- end }}
+
+{{ if .JSON -}}
+	// MarshalJSON encodes the wrapped {{ .Type }} into JSON.
+	func (x *{{ .Name }}) MarshalJSON() ([]byte, error) {
+		return json.Marshal(x.Load())
+	}
+
+	// UnmarshalJSON decodes a {{ .Type }} from JSON.
+	func (x *{{ .Name }}) UnmarshalJSON(b []byte) error {
+		var v {{ .Type }}
+		if err := json.Unmarshal(b, &v); err != nil {
+			return err
+		}
+		x.Store(v)
+		return nil
+	}
+{{- end }}
+
+`))