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builder.go
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builder.go
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// Copyright 2018 Istio Authors.
//
// 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 dynamic
import (
"fmt"
"sort"
"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
"istio.io/api/policy/v1beta1"
"istio.io/istio/mixer/pkg/lang/compiled"
"istio.io/istio/mixer/pkg/protobuf/yaml"
"istio.io/istio/mixer/pkg/runtime/lang"
istiolog "istio.io/istio/pkg/log"
)
var (
builderLog = istiolog.RegisterScope("grpcAdapter", "dynamic proto encoder debugging", 0)
)
type (
// Builder builds encoder based on data
Builder struct {
resolver yaml.Resolver
compiler lang.Compiler
skipUnknown bool
namedTypes map[string]NamedEncoderBuilderFunc
}
// NamedEncoderBuilderFunc funcs have a special way to process input for encoding specific types
// for example istio...Value field accepts user input in a specific way
NamedEncoderBuilderFunc func(m *descriptor.DescriptorProto, fd *descriptor.FieldDescriptorProto, v interface{}, compiler lang.Compiler) (Encoder, error)
)
// NewEncoderBuilder creates an EncoderBuilder.
func NewEncoderBuilder(resolver yaml.Resolver, compiler lang.Compiler, skipUnknown bool) *Builder {
return &Builder{
resolver: resolver,
compiler: compiler,
skipUnknown: skipUnknown,
namedTypes: valueTypeBuilderFuncs(),
}
}
// BuildWithLength builds an Encoder that also encodes length of the top level message.
func (c Builder) BuildWithLength(msgName string, data map[string]interface{}) (Encoder, error) {
m := c.resolver.ResolveMessage(msgName)
if m == nil {
return nil, fmt.Errorf("cannot resolve message '%s'", msgName)
}
return c.buildMessage(m, data, false)
}
// Build builds an Encoder
func (c Builder) Build(msgName string, data map[string]interface{}) (Encoder, error) {
m := c.resolver.ResolveMessage(msgName)
if m == nil {
return nil, fmt.Errorf("cannot resolve message '%s'", msgName)
}
return c.buildMessage(m, data, true)
}
func (c Builder) buildMessage(md *descriptor.DescriptorProto, data map[string]interface{}, skipEncodeLength bool) (Encoder, error) {
me := messageEncoder{
skipEncodeLength: skipEncodeLength,
}
isMap := md.GetOptions().GetMapEntry()
// sort keys so that processing is done in a deterministic order.
// It makes logs deterministic.
keys := make([]string, 0, len(data))
for k := range data {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
var err error
v := data[k]
fd := yaml.FindFieldByName(md, k)
if fd == nil {
if c.skipUnknown {
builderLog.Debugf("skipping key=%s from message %s", k, md.GetName())
continue
}
return nil, fmt.Errorf("fieldEncoder '%s' not found in message '%s'", k, md.GetName())
}
// If the input already has an encoder
// just use it
if de, ok := v.(Encoder); ok {
fld := makeField(fd)
fld.encoder = []Encoder{de}
me.fields = append(me.fields, fld)
continue
}
// if the message is a map, key is never
// treated as an expression.
noExpr := isMap && k == "key"
switch fd.GetType() {
case descriptor.FieldDescriptorProto_TYPE_STRING:
var ma []interface{}
var ok bool
if fd.IsRepeated() {
if ma, ok = v.([]interface{}); !ok {
return nil, fmt.Errorf("unable to process %s: %v, got %T, want: []interface{}", fd.GetName(), v, v)
}
} else {
ma = []interface{}{v}
}
for _, vv := range ma {
var fld *fieldEncoder
if fld, err = c.buildPrimitiveField(vv, fd, noExpr); err != nil {
return nil, fmt.Errorf("unable to encode fieldEncoder %s: %v. %v", fd.GetName(), v, err)
}
me.fields = append(me.fields, fld)
}
// primitives
case descriptor.FieldDescriptorProto_TYPE_DOUBLE,
descriptor.FieldDescriptorProto_TYPE_FLOAT,
descriptor.FieldDescriptorProto_TYPE_INT64,
descriptor.FieldDescriptorProto_TYPE_UINT64,
descriptor.FieldDescriptorProto_TYPE_INT32,
descriptor.FieldDescriptorProto_TYPE_FIXED64,
descriptor.FieldDescriptorProto_TYPE_FIXED32,
descriptor.FieldDescriptorProto_TYPE_BOOL,
descriptor.FieldDescriptorProto_TYPE_UINT32,
descriptor.FieldDescriptorProto_TYPE_SFIXED32,
descriptor.FieldDescriptorProto_TYPE_SFIXED64,
descriptor.FieldDescriptorProto_TYPE_SINT32,
descriptor.FieldDescriptorProto_TYPE_SINT64,
descriptor.FieldDescriptorProto_TYPE_ENUM:
packed := fd.IsPacked() || fd.IsPacked3()
if fd.IsRepeated() && !packed {
return nil, fmt.Errorf("unpacked primitives not supported: %v", fd)
}
var fld *fieldEncoder
if fld, err = c.buildPrimitiveField(v, fd, noExpr); err != nil {
return nil, fmt.Errorf("unable to encode fieldEncoder: %v. %v", fd, err)
}
me.fields = append(me.fields, fld)
case descriptor.FieldDescriptorProto_TYPE_MESSAGE:
m := c.resolver.ResolveMessage(fd.GetTypeName())
if m == nil {
return nil, fmt.Errorf("unable to resolve message '%s'", fd.GetTypeName())
}
var ma []interface{}
var ok bool
if m.GetOptions().GetMapEntry() { // this is a Map
ma, err = convertMapToMapentry(v)
if err != nil {
return nil, fmt.Errorf("unable to process: %v, %v", fd, err)
}
} else if fd.IsRepeated() { // map entry is always repeated.
ma, ok = v.([]interface{})
if !ok {
return nil, fmt.Errorf("unable to process: %v, got %T, want: []interface{}", fd, v)
}
} else {
ma = []interface{}{v}
}
// now maps, messages and repeated messages all look the same.
if err = c.buildMessageField(ma, m, fd, &me); err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("field type not supported '%v'", fd.GetType())
}
}
// sorting fields is recommended
sort.SliceStable(me.fields, func(i, j int) bool {
return me.fields[i].number < me.fields[j].number
})
return me, nil
}
// buildStaticEncoder builds static encoder with special case for enum.
func buildStaticEncoder(val interface{}, fd *descriptor.FieldDescriptorProto, e *descriptor.EnumDescriptorProto) (Encoder, error) {
var enc Encoder
var err error
if fd.IsEnum() {
pe := &staticEncoder{name: fd.GetName()}
// EncodeEnum accepts strings and ints.
pe.encodedData, err = EncodeEnum(val, pe.encodedData, e.Value)
enc = pe
} else {
enc, err = BuildPrimitiveEncoder(val, fd)
}
return enc, err
}
// buildDynamicEncoder builds dynamic encoder with special case for enum.
func buildDynamicEncoder(sval string, fd *descriptor.FieldDescriptorProto, e *descriptor.EnumDescriptorProto, c lang.Compiler) (Encoder, error) {
var err error
var expr compiled.Expression
var vt v1beta1.ValueType
if expr, vt, err = c.Compile(sval); err != nil {
return nil, err
}
if fd.IsEnum() {
// enums can be expressed as String or INT only
if !(vt == v1beta1.INT64 || vt == v1beta1.STRING) {
return nil, fmt.Errorf("field:%v enum %v is of type:%v. want INT64 or STRING", fd.GetName(), sval, vt)
}
return &eEnumEncoder{
expr: expr,
enumValues: e.Value,
}, nil
}
return BuildPrimitiveEvalEncoder(expr, vt, fd)
}
// buildPrimitiveField handles encoding of single and repeated packed primitives
// if noExpr is true create static encoder.
func (c Builder) buildPrimitiveField(v interface{}, fd *descriptor.FieldDescriptorProto, noExpr bool) (*fieldEncoder, error) {
fld := makeField(fd)
enum := c.resolver.ResolveEnum(fd.GetTypeName())
if fd.IsEnum() && enum == nil {
return nil, fmt.Errorf("unable to resolve enum: %v for field %v", fd.GetTypeName(), fd.GetName())
}
va, packed := v.([]interface{})
if !packed {
va = []interface{}{v}
}
for _, vl := range va {
val, isConstString := transformQuotedString(vl)
sval, isString := val.(string)
var err error
var enc Encoder
// if compiler is nil, everything is considered noExpr
if noExpr || isConstString || !isString || c.compiler == nil {
enc, err = buildStaticEncoder(val, fd, enum)
} else {
enc, err = buildDynamicEncoder(sval, fd, enum, c.compiler)
}
if err != nil {
return nil, fmt.Errorf("unable to build primitve encoder for:%v %v. %v", fld.name, val, err)
}
// now enc != nil
fld.encoder = append(fld.encoder, enc)
}
return fld, nil
}
func (c Builder) buildMessageField(ma []interface{}, m *descriptor.DescriptorProto,
fd *descriptor.FieldDescriptorProto, me *messageEncoder) error {
namedBuilder := c.namedTypes[fd.GetTypeName()]
for _, vv := range ma {
var de Encoder
var err error
if namedBuilder != nil {
de, err = namedBuilder(m, fd, vv, c.compiler)
} else {
var ok bool
var vq map[string]interface{}
if vq, ok = vv.(map[string]interface{}); !ok {
return fmt.Errorf("unable to process: %v, got %T, want: map[string]interface{}", fd, vv)
}
de, err = c.buildMessage(m, vq, false)
}
if err != nil {
return fmt.Errorf("unable to build message field: %v, %v", fd.GetName(), err)
}
fld := makeField(fd)
fld.encoder = []Encoder{de}
me.fields = append(me.fields, fld)
}
return nil
}
// convertMapToMapentry converts {k:v} into { "key": k, "value": v }
func convertMapToMapentry(data interface{}) ([]interface{}, error) {
md, ok := data.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("incorrect map type:%T, want:map[string]interface{}", data)
}
res := make([]interface{}, 0, len(md))
for k, v := range md {
res = append(res, map[string]interface{}{
"key": k,
"value": v,
})
}
return res, nil
}