/
data.go
525 lines (425 loc) · 12.6 KB
/
data.go
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package runner
import (
"encoding/json"
"errors"
"fmt"
"io"
"strings"
"sync"
"text/template"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
"github.com/jhump/protoreflect/desc"
"github.com/jhump/protoreflect/dynamic"
"google.golang.org/grpc/metadata"
)
// TODO move to own pacakge?
// TODO add tests
// TODO expose public API utilizing only proto API and not dynamic
// ErrEndStream is a signal from message providers that worker should close the stream
// It should not be used for erronous states
var ErrEndStream = errors.New("ending stream")
// ErrLastMessage is a signal from message providers that the returned payload is the last one of the stream
// This is optional but encouraged for optimized performance
// Message payload returned along with this error must be valid and may not be nil
var ErrLastMessage = errors.New("last message")
// DataProviderFunc is the interface for providing data for calls
// For unary and server streaming calls it should return an array with a single element
// For client and bidi streaming calls it should return an array of messages to be used
type DataProviderFunc func(*CallData) ([]*dynamic.Message, error)
// MetadataProviderFunc is the interface for providing metadadata for calls
type MetadataProviderFunc func(*CallData) (*metadata.MD, error)
// StreamMessageProviderFunc is the interface for providing a message for every message send in the course of a streaming call
type StreamMessageProviderFunc func(*CallData) (*dynamic.Message, error)
// StreamRecvMsgInterceptFunc is an interface for function invoked when we receive a stream message
// Clients can return ErrEndStream to end the call early
type StreamRecvMsgInterceptFunc func(*dynamic.Message, error) error
type dataProvider struct {
binary bool
data []byte
mtd *desc.MethodDescriptor
dataFunc BinaryDataFunc
arrayJSONData []string
hasActions bool
// cached messages only for binary
mutex sync.RWMutex
cachedMessages []*dynamic.Message
}
type mdProvider struct {
metadata []byte
preseed metadata.MD
}
func newDataProvider(mtd *desc.MethodDescriptor,
binary bool, dataFunc BinaryDataFunc, data []byte,
funcs template.FuncMap) (*dataProvider, error) {
dp := dataProvider{
binary: binary,
dataFunc: dataFunc,
mtd: mtd,
data: data,
cachedMessages: nil,
}
// fill in JSON string array data for optimization for non client-streaming
var err error
dp.arrayJSONData = nil
if !dp.binary {
if strings.IndexRune(string(data), '[') == 0 { // it's an array
var dat []map[string]interface{}
if err := json.Unmarshal(data, &dat); err != nil {
return nil, err
}
dp.arrayJSONData = make([]string, len(dat))
for i, d := range dat {
var strd []byte
if strd, err = json.Marshal(d); err != nil {
return nil, err
}
dp.arrayJSONData[i] = string(strd)
}
}
}
// Test if we can preseed data
ctd := newCallData(mtd, funcs, "", 0)
ha, err := ctd.hasAction(string(dp.data))
if err != nil {
return nil, err
}
dp.hasActions = ha
if !ha {
if len(dp.arrayJSONData) > 0 {
dp.mutex.Lock()
dp.cachedMessages = make([]*dynamic.Message, len(dp.arrayJSONData))
dp.mutex.Unlock()
}
_, err := dp.getDataForCall(ctd)
if err != nil {
return nil, err
}
}
return &dp, nil
}
func (dp *dataProvider) getDataForCall(ctd *CallData) ([]*dynamic.Message, error) {
var inputs []*dynamic.Message
var err error
// try the optimized path for JSON data for non client-streaming
if !dp.binary && !dp.mtd.IsClientStreaming() && len(dp.arrayJSONData) > 0 {
indx := int(ctd.RequestNumber % int64(len(dp.arrayJSONData))) // we want to start from inputs[0] so dec reqNum
if inputs, err = dp.getMessages(ctd, indx, []byte(dp.arrayJSONData[indx])); err != nil {
return nil, err
}
} else if inputs, err = dp.getMessages(ctd, -1, dp.data); err != nil {
return nil, err
}
if !dp.mtd.IsClientStreaming() {
inputIdx := int(ctd.RequestNumber % int64(len(inputs)))
unaryInput := inputs[inputIdx]
return []*dynamic.Message{unaryInput}, nil
}
return inputs, nil
}
func (dp *dataProvider) getMessages(ctd *CallData, i int, inputData []byte) ([]*dynamic.Message, error) {
var inputs []*dynamic.Message
var err error
dp.mutex.RLock()
if dp.cachedMessages != nil {
if (i < 0 && len(dp.cachedMessages) > 0 && dp.cachedMessages[0] != nil) ||
(i >= 0 && i < len(dp.cachedMessages) && dp.cachedMessages[i] != nil) {
defer dp.mutex.RUnlock()
return dp.cachedMessages, nil
}
}
dp.mutex.RUnlock()
if !dp.binary {
data := inputData
if dp.hasActions {
cdata, err := ctd.ExecuteData(string(inputData))
if err != nil {
return nil, err
}
data = cdata
}
inputs, err = createPayloadsFromJSON(string(data), dp.mtd)
if err != nil {
return nil, err
}
// only cache JSON data if there are no template actions
if !dp.hasActions {
dp.mutex.Lock()
if i < 0 {
dp.cachedMessages = inputs
} else {
if i >= cap(dp.cachedMessages) {
nc := make([]*dynamic.Message, len(dp.cachedMessages), (cap(dp.cachedMessages) + i + 1))
copy(nc, dp.cachedMessages)
dp.cachedMessages = nc
}
if i < len(dp.cachedMessages) {
dp.cachedMessages[i] = inputs[0]
} else {
dp.cachedMessages = append(dp.cachedMessages, inputs...)
}
}
dp.mutex.Unlock()
}
} else {
var err error
if dp.dataFunc != nil {
inputData = dp.dataFunc(dp.mtd, ctd)
}
inputs, err = createPayloadsFromBin(inputData, dp.mtd)
if err != nil {
return nil, err
}
// We only cache in case we don't dynamically change the binary message
if dp.dataFunc == nil {
dp.mutex.Lock()
dp.cachedMessages = inputs
dp.mutex.Unlock()
}
}
return inputs, nil
}
func newMetadataProvider(mtd *desc.MethodDescriptor, mdData []byte) (*mdProvider, error) {
// Test if we can preseed data
ctd := newCallData(mtd, nil, "", 0)
ha, err := ctd.hasAction(string(mdData))
if err != nil {
return nil, err
}
var preseed metadata.MD = nil
if !ha {
mdMap, err := ctd.executeMetadata(string(mdData))
if err != nil {
return nil, err
}
if len(mdMap) > 0 {
preseed = metadata.New(mdMap)
}
}
return &mdProvider{metadata: mdData, preseed: preseed}, nil
}
func (dp *mdProvider) getMetadataForCall(ctd *CallData) (*metadata.MD, error) {
if dp.preseed != nil {
return &dp.preseed, nil
}
mdMap, err := ctd.executeMetadata(string(dp.metadata))
if err != nil {
return nil, err
}
if len(mdMap) > 0 {
md := metadata.New(mdMap)
return &md, nil
}
return &metadata.MD{}, nil
}
// creates a message from a map
// marshal to JSON then use jsonpb to marshal to message
// this way we follow protobuf more closely and allow camelCase properties.
func messageFromMap(input *dynamic.Message, data *map[string]interface{}) error {
strData, err := json.Marshal(data)
if err != nil {
return err
}
err = jsonpb.UnmarshalString(string(strData), input)
if err != nil {
return err
}
return nil
}
func createPayloadsFromJSON(data string, mtd *desc.MethodDescriptor) ([]*dynamic.Message, error) {
md := mtd.GetInputType()
var inputs []*dynamic.Message
if len(data) > 0 {
if strings.IndexRune(data, '[') == 0 {
dataArray := make([]map[string]interface{}, 5)
err := json.Unmarshal([]byte(data), &dataArray)
if err != nil {
return nil, fmt.Errorf("Error unmarshalling payload. Data: '%v' Error: %v", data, err.Error())
}
elems := len(dataArray)
if elems > 0 {
inputs = make([]*dynamic.Message, elems)
}
for i, elem := range dataArray {
elemMsg := dynamic.NewMessage(md)
err := messageFromMap(elemMsg, &elem)
if err != nil {
return nil, fmt.Errorf("Error creating message: %v", err.Error())
}
inputs[i] = elemMsg
}
} else {
inputs = make([]*dynamic.Message, 1)
inputs[0] = dynamic.NewMessage(md)
err := jsonpb.UnmarshalString(data, inputs[0])
if err != nil {
return nil, fmt.Errorf("Error creating message from data. Data: '%v' Error: %v", data, err.Error())
}
}
}
return inputs, nil
}
func createPayloadsFromBinSingleMessage(binData []byte, mtd *desc.MethodDescriptor) ([]*dynamic.Message, error) {
inputs := make([]*dynamic.Message, 0, 1)
md := mtd.GetInputType()
// return empty array if no data
if len(binData) == 0 {
return inputs, nil
}
// try to unmarshal input as a single message
singleMessage := dynamic.NewMessage(md)
err := proto.Unmarshal(binData, singleMessage)
if err != nil {
return nil, fmt.Errorf("Error creating message from binary data: %v", err.Error())
}
inputs = append(inputs, singleMessage)
return inputs, nil
}
func createPayloadsFromBinCountDelimited(binData []byte, mtd *desc.MethodDescriptor) ([]*dynamic.Message, error) {
inputs := make([]*dynamic.Message, 0)
md := mtd.GetInputType()
// return empty array if no data
if len(binData) == 0 {
return inputs, nil
}
// try to unmarshal input as several count-delimited messages
buffer := proto.NewBuffer(binData)
for {
msg := dynamic.NewMessage(md)
err := buffer.DecodeMessage(msg)
if err == io.ErrUnexpectedEOF {
break
}
if err != nil {
return nil, fmt.Errorf("Error creating message from binary data: %v", err.Error())
}
inputs = append(inputs, msg)
}
return inputs, nil
}
func createPayloadsFromBin(binData []byte, mtd *desc.MethodDescriptor) ([]*dynamic.Message, error) {
inputs, err := createPayloadsFromBinCountDelimited(binData, mtd)
if err == nil && len(inputs) > 0 {
return inputs, err
}
return createPayloadsFromBinSingleMessage(binData, mtd)
}
type dynamicMessageProvider struct {
mtd *desc.MethodDescriptor
data []byte
arrayJSONData []string
arrayLen uint
streamCallCount uint
counter uint
indexCounter uint
}
func newDynamicMessageProvider(mtd *desc.MethodDescriptor, data []byte, streamCallCount uint) (*dynamicMessageProvider, error) {
mp := dynamicMessageProvider{
mtd: mtd,
data: data,
arrayJSONData: nil,
streamCallCount: streamCallCount,
}
var err error
if strings.IndexRune(string(data), '[') == 0 { // it's an array
var dat []map[string]interface{}
if err := json.Unmarshal(data, &dat); err != nil {
return nil, err
}
mp.arrayJSONData = make([]string, len(dat))
for i, d := range dat {
var strd []byte
if strd, err = json.Marshal(d); err != nil {
return nil, err
}
mp.arrayJSONData[i] = string(strd)
}
}
mp.arrayLen = uint(len(mp.arrayJSONData))
// Test if we have actions
ctd := newCallData(mtd, nil, "", 0)
ha, err := ctd.hasAction(string(mp.data))
if err != nil {
return nil, err
}
if !ha {
return nil, errors.New("default message provider cannot be used with static data")
}
return &mp, nil
}
func (m *dynamicMessageProvider) GetStreamMessage(parentCallData *CallData) (*dynamic.Message, error) {
isLast := false
if m.streamCallCount > 0 {
if m.counter >= m.streamCallCount {
return nil, ErrEndStream
} else if m.counter >= m.arrayLen {
m.indexCounter = 0
}
isLast = m.counter == m.streamCallCount-1
} else if m.counter >= m.arrayLen {
return nil, ErrEndStream
} else if m.counter == m.arrayLen-1 {
isLast = true
}
ctd := parentCallData.Regenerate()
data := string(m.data)
if m.arrayLen > 0 {
if m.counter >= m.arrayLen {
m.indexCounter = 0
}
data = m.arrayJSONData[m.indexCounter]
}
buf, err := ctd.ExecuteData(data)
if err != nil {
return nil, err
}
md := m.mtd.GetInputType()
msg := dynamic.NewMessage(md)
err = jsonpb.UnmarshalString(string(buf), msg)
if err != nil {
return nil, fmt.Errorf("Error creating message from data. Data: '%v' Error: %v", data, err.Error())
}
m.counter++
m.indexCounter++
if err == nil && isLast {
err = ErrLastMessage
}
return msg, err
}
type staticMessageProvider struct {
inputs []*dynamic.Message
inputLen uint
streamCallCount uint
counter uint
indexCounter uint
}
func newStaticMessageProvider(streamCallCount uint, inputs []*dynamic.Message) (*staticMessageProvider, error) {
return &staticMessageProvider{
streamCallCount: streamCallCount,
inputs: inputs,
inputLen: uint(len(inputs)),
}, nil
}
func (m *staticMessageProvider) GetStreamMessage(parentCallData *CallData) (*dynamic.Message, error) {
isLast := false
if m.streamCallCount > 0 {
if m.counter >= m.streamCallCount {
return nil, ErrEndStream
} else if m.indexCounter == m.inputLen {
m.indexCounter = 0
}
isLast = m.counter == m.streamCallCount-1
} else if m.counter >= m.inputLen {
return nil, ErrEndStream
} else if m.counter == m.inputLen-1 {
isLast = true
}
payload := m.inputs[m.indexCounter]
m.counter++
m.indexCounter++
var err error
if err == nil && isLast {
err = ErrLastMessage
}
return payload, err
}