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// Copyright 2018 Google Inc.
//
// 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 state
import (
"fmt"
"io"
"io/ioutil"
"strings"
"github.com/golang/protobuf/proto"
pb "gvisor.googlesource.com/gvisor/pkg/state/object_go_proto"
)
// format formats a single object, for pretty-printing.
func format(graph uint64, depth int, object *pb.Object, html bool) (string, bool) {
switch x := object.GetValue().(type) {
case *pb.Object_BoolValue:
return fmt.Sprintf("%t", x.BoolValue), x.BoolValue != false
case *pb.Object_StringValue:
return fmt.Sprintf("\"%s\"", x.StringValue), x.StringValue != ""
case *pb.Object_Int64Value:
return fmt.Sprintf("%d", x.Int64Value), x.Int64Value != 0
case *pb.Object_Uint64Value:
return fmt.Sprintf("%du", x.Uint64Value), x.Uint64Value != 0
case *pb.Object_DoubleValue:
return fmt.Sprintf("%f", x.DoubleValue), x.DoubleValue != 0.0
case *pb.Object_RefValue:
if x.RefValue == 0 {
return "nil", false
}
ref := fmt.Sprintf("g%dr%d", graph, x.RefValue)
if html {
ref = fmt.Sprintf("<a href=#%s>%s</a>", ref, ref)
}
return ref, true
case *pb.Object_SliceValue:
if x.SliceValue.RefValue == 0 {
return "nil", false
}
ref := fmt.Sprintf("g%dr%d", graph, x.SliceValue.RefValue)
if html {
ref = fmt.Sprintf("<a href=#%s>%s</a>", ref, ref)
}
return fmt.Sprintf("%s[:%d:%d]", ref, x.SliceValue.Length, x.SliceValue.Capacity), true
case *pb.Object_ArrayValue:
if len(x.ArrayValue.Contents) == 0 {
return "[]", false
}
items := make([]string, 0, len(x.ArrayValue.Contents)+2)
zeros := make([]string, 0) // used to eliminate zero entries.
items = append(items, "[")
tabs := "\n" + strings.Repeat("\t", depth)
for i := 0; i < len(x.ArrayValue.Contents); i++ {
item, ok := format(graph, depth+1, x.ArrayValue.Contents[i], html)
if ok {
if len(zeros) > 0 {
items = append(items, zeros...)
zeros = nil
}
items = append(items, fmt.Sprintf("\t%s,", item))
} else {
zeros = append(zeros, fmt.Sprintf("\t%s,", item))
}
}
if len(zeros) > 0 {
items = append(items, fmt.Sprintf("\t... (%d zero),", len(zeros)))
}
items = append(items, "]")
return strings.Join(items, tabs), len(zeros) < len(x.ArrayValue.Contents)
case *pb.Object_StructValue:
if len(x.StructValue.Fields) == 0 {
return "struct{}", false
}
items := make([]string, 0, len(x.StructValue.Fields)+2)
items = append(items, "struct{")
tabs := "\n" + strings.Repeat("\t", depth)
allZero := true
for _, field := range x.StructValue.Fields {
element, ok := format(graph, depth+1, field.Value, html)
allZero = allZero && !ok
items = append(items, fmt.Sprintf("\t%s: %s,", field.Name, element))
}
items = append(items, "}")
return strings.Join(items, tabs), !allZero
case *pb.Object_MapValue:
if len(x.MapValue.Keys) == 0 {
return "map{}", false
}
items := make([]string, 0, len(x.MapValue.Keys)+2)
items = append(items, "map{")
tabs := "\n" + strings.Repeat("\t", depth)
for i := 0; i < len(x.MapValue.Keys); i++ {
key, _ := format(graph, depth+1, x.MapValue.Keys[i], html)
value, _ := format(graph, depth+1, x.MapValue.Values[i], html)
items = append(items, fmt.Sprintf("\t%s: %s,", key, value))
}
items = append(items, "}")
return strings.Join(items, tabs), true
case *pb.Object_InterfaceValue:
if x.InterfaceValue.Type == "" {
return "interface(nil){}", false
}
element, _ := format(graph, depth+1, x.InterfaceValue.Value, html)
return fmt.Sprintf("interface(\"%s\"){%s}", x.InterfaceValue.Type, element), true
}
// Should not happen, but tolerate.
return fmt.Sprintf("(unknown proto type: %T)", object.GetValue()), true
}
// PrettyPrint reads the state stream from r, and pretty prints to w.
func PrettyPrint(w io.Writer, r io.Reader, html bool) error {
var (
// current graph ID.
graph uint64
// current object ID.
id uint64
)
if html {
fmt.Fprintf(w, "<pre>")
defer fmt.Fprintf(w, "</pre>")
}
for {
// Find the first object to begin generation.
length, object, err := ReadHeader(r)
if err == io.EOF {
// Nothing else to do.
break
} else if err != nil {
return err
}
if !object {
// Increment the graph number & reset the ID.
graph++
id = 0
if length > 0 {
fmt.Fprintf(w, "(%d bytes non-object data)\n", length)
io.Copy(ioutil.Discard, &io.LimitedReader{
R: r,
N: int64(length),
})
}
continue
}
// Read & unmarshal the object.
buf := make([]byte, length)
for done := 0; done < len(buf); {
n, err := r.Read(buf[done:])
done += n
if n == 0 && err != nil {
return err
}
}
obj := new(pb.Object)
if err := proto.Unmarshal(buf, obj); err != nil {
return err
}
id++ // First object must be one.
str, _ := format(graph, 0, obj, html)
tag := fmt.Sprintf("g%dr%d", graph, id)
if html {
tag = fmt.Sprintf("<a name=%s>%s</a>", tag, tag)
}
if _, err := fmt.Fprintf(w, "%s = %s\n", tag, str); err != nil {
return err
}
}
return nil
}
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