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jsonrpc.go
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jsonrpc.go
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// Package jsonrpc provides JSON RPC utilities for serialisation of AWS
// requests and responses.
package jsonrpc
//go:generate go run ../../fixtures/protocol/generate.go ../../fixtures/protocol/input/json.json build_test.go
//go:generate go run ../../fixtures/protocol/generate.go ../../fixtures/protocol/output/json.json unmarshal_test.go
import (
"encoding/json"
"io/ioutil"
"reflect"
"strings"
"github.com/ks3sdklib/aws-sdk-go/aws"
"github.com/ks3sdklib/aws-sdk-go/internal/apierr"
"github.com/ks3sdklib/aws-sdk-go/internal/protocol/json/jsonutil"
)
var emptyJSON = []byte("{}")
// Build builds a JSON payload for a JSON RPC request.
func Build(req *aws.Request) {
var buf []byte
var err error
if req.ParamsFilled() {
v := reflect.ValueOf(req.Params).Elem()
if field, ok := v.Type().FieldByName("SDKShapeTraits"); ok {
if payloadName := field.Tag.Get("payload"); payloadName != "" {
pfield, _ := v.Type().FieldByName(payloadName)
if ptag := pfield.Tag.Get("type"); ptag == "" || ptag == "structure" {
payload := reflect.Indirect(v.FieldByName(payloadName))
if payload.IsValid() && payload.Interface() != nil {
buf, err = jsonutil.BuildJSON(payload.Interface())
}
}
}
}
if err != nil {
req.Error = apierr.New("Marshal", "failed encoding JSON RPC request", err)
return
}
} else {
buf = emptyJSON
}
if req.Service.TargetPrefix != "" || string(buf) != "{}" {
req.SetBufferBody(buf)
}
if req.Service.TargetPrefix != "" {
target := req.Service.TargetPrefix + "." + req.Operation.Name
req.HTTPRequest.Header.Add("X-Amz-Target", target)
}
if req.Service.JSONVersion != "" {
jsonVersion := req.Service.JSONVersion
req.HTTPRequest.Header.Add("Content-Type", "application/x-amz-json-"+jsonVersion)
}
}
// Unmarshal unmarshals a response for a JSON RPC service.
func Unmarshal(req *aws.Request) {
defer req.HTTPResponse.Body.Close()
if req.DataFilled() {
v := reflect.ValueOf(req.Data).Elem()
if field, ok := v.Type().FieldByName("SDKShapeTraits"); ok {
if payloadName := field.Tag.Get("payload"); payloadName != "" {
pfield, _ := v.Type().FieldByName(payloadName)
if ptag := pfield.Tag.Get("type"); ptag == "" || ptag == "structure" {
payload := v.FieldByName(payloadName)
if payload.IsValid() && payload.Interface() != nil {
err := jsonutil.UnmarshalJSON(payload.Interface(), req.HTTPResponse.Body)
if err != nil {
req.Error = apierr.New("Unmarshal", "failed decoding JSON RPC response", err)
}
}
}
}
}
}
return
}
// UnmarshalMeta unmarshals headers from a response for a JSON RPC service.
func UnmarshalMeta(req *aws.Request) {
req.RequestID = req.HTTPResponse.Header.Get("x-amzn-requestid")
}
// UnmarshalError unmarshals an error response for a JSON RPC service.
func UnmarshalError(req *aws.Request) {
defer req.HTTPResponse.Body.Close()
bodyBytes, err := ioutil.ReadAll(req.HTTPResponse.Body)
if err != nil {
req.Error = apierr.New("Unmarshal", "failed reading JSON RPC error response", err)
return
}
if len(bodyBytes) == 0 {
req.Error = apierr.NewRequestError(
apierr.New("Unmarshal", req.HTTPResponse.Status, nil),
req.HTTPResponse.StatusCode,
"",
)
return
}
var jsonErr jsonErrorResponse
if err := json.Unmarshal(bodyBytes, &jsonErr); err != nil {
req.Error = apierr.New("Unmarshal", "failed decoding JSON RPC error response", err)
return
}
codes := strings.SplitN(jsonErr.Code, "#", 2)
req.Error = apierr.NewRequestError(
apierr.New(codes[len(codes)-1], jsonErr.Message, nil),
req.HTTPResponse.StatusCode,
"",
)
}
type jsonErrorResponse struct {
Code string `json:"__type"`
Message string `json:"message"`
}