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Merged
zasweq merged 10 commits into from
May 31, 2024
Merged

interop/xds: Interop client and server changes for CSM Observability #7280

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65dfe2b
Interop client and server changes for CSM Observability
zasweq May 29, 2024
082b078
Responded to Doug's comments
zasweq May 30, 2024
e432a12
Switch port
zasweq May 30, 2024
88f2fef
Fix?
zasweq May 30, 2024
68b63b9
Remove pretty
zasweq May 30, 2024
41262c1
Thanks Doug
zasweq May 30, 2024
c2e6647
Responded to Doug's comments
zasweq May 31, 2024
4c66137
Add Prometheus address env var
zasweq May 31, 2024
4484a86
Switch to build .
zasweq May 31, 2024
e818269
go mod tidy
zasweq May 31, 2024
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4 changes: 2 additions & 2 deletions interop/xds/client/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -24,13 +24,13 @@ COPY . .

# Build a static binary without cgo so that we can copy just the binary in the
# final image, and can get rid of Go compiler and gRPC-Go dependencies.
RUN go build -tags osusergo,netgo interop/xds/client/client.go
RUN cd interop/xds/client && go build -tags osusergo,netgo .

# Second stage of the build which copies over only the client binary and skips
# the Go compiler and gRPC repo from the earlier stage. This significantly
# reduces the docker image size.
FROM alpine
COPY --from=build /go/src/grpc-go/client .
COPY --from=build /go/src/grpc-go/interop/xds/client/client .
ENV GRPC_GO_LOG_VERBOSITY_LEVEL=99
ENV GRPC_GO_LOG_SEVERITY_LEVEL="info"
ENV GRPC_GO_LOG_FORMATTER="json"
Expand Down
72 changes: 60 additions & 12 deletions interop/xds/client/client.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@ import (
"fmt"
"log"
"net"
"net/http"
"os"
"strings"
"sync"
"sync/atomic"
Expand All @@ -35,15 +37,21 @@ import (
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/credentials/xds"
"google.golang.org/grpc/grpclog"
_ "google.golang.org/grpc/interop/xds" // to register Custom LB.
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/reflection"
"google.golang.org/grpc/stats/opentelemetry"
"google.golang.org/grpc/stats/opentelemetry/csm"
"google.golang.org/grpc/status"
_ "google.golang.org/grpc/xds"

testgrpc "google.golang.org/grpc/interop/grpc_testing"
testpb "google.golang.org/grpc/interop/grpc_testing"
_ "google.golang.org/grpc/interop/xds" // to register Custom LB.

"github.com/prometheus/client_golang/prometheus/promhttp"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/sdk/metric"
)

func init() {
Expand Down Expand Up @@ -169,16 +177,19 @@ func (as *accumulatedStats) finishRPC(rpcType string, err error) {
}

var (
failOnFailedRPC = flag.Bool("fail_on_failed_rpc", false, "Fail client if any RPCs fail after first success")
numChannels = flag.Int("num_channels", 1, "Num of channels")
printResponse = flag.Bool("print_response", false, "Write RPC response to stdout")
qps = flag.Int("qps", 1, "QPS per channel, for each type of RPC")
rpc = flag.String("rpc", "UnaryCall", "Types of RPCs to make, ',' separated string. RPCs can be EmptyCall or UnaryCall. Deprecated: Use Configure RPC to XdsUpdateClientConfigureServiceServer instead.")
rpcMetadata = flag.String("metadata", "", "The metadata to send with RPC, in format EmptyCall:key1:value1,UnaryCall:key2:value2. Deprecated: Use Configure RPC to XdsUpdateClientConfigureServiceServer instead.")
rpcTimeout = flag.Duration("rpc_timeout", 20*time.Second, "Per RPC timeout")
server = flag.String("server", "localhost:8080", "Address of server to connect to")
statsPort = flag.Int("stats_port", 8081, "Port to expose peer distribution stats service")
secureMode = flag.Bool("secure_mode", false, "If true, retrieve security configuration from the management server. Else, use insecure credentials.")
failOnFailedRPC = flag.Bool("fail_on_failed_rpc", false, "Fail client if any RPCs fail after first success")
numChannels = flag.Int("num_channels", 1, "Num of channels")
printResponse = flag.Bool("print_response", false, "Write RPC response to stdout")
qps = flag.Int("qps", 1, "QPS per channel, for each type of RPC")
rpc = flag.String("rpc", "UnaryCall", "Types of RPCs to make, ',' separated string. RPCs can be EmptyCall or UnaryCall. Deprecated: Use Configure RPC to XdsUpdateClientConfigureServiceServer instead.")
rpcMetadata = flag.String("metadata", "", "The metadata to send with RPC, in format EmptyCall:key1:value1,UnaryCall:key2:value2. Deprecated: Use Configure RPC to XdsUpdateClientConfigureServiceServer instead.")
rpcTimeout = flag.Duration("rpc_timeout", 20*time.Second, "Per RPC timeout")
server = flag.String("server", "localhost:8080", "Address of server to connect to")
statsPort = flag.Int("stats_port", 8081, "Port to expose peer distribution stats service")
secureMode = flag.Bool("secure_mode", false, "If true, retrieve security configuration from the management server. Else, use insecure credentials.")
enableCSMObservability = flag.Bool("enable_csm_observability", false, "Whether to enable CSM Observability")
requestPayloadSize = flag.Int("request_payload_size", 0, "Ask the server to respond with SimpleResponse.payload.body of the given length (may not be implemented on the server).")
responsePayloadSize = flag.Int("response_payload_size", 0, "Ask the server to respond with SimpleResponse.payload.body of the given length (may not be implemented on the server).")

rpcCfgs atomic.Value

Expand Down Expand Up @@ -368,6 +379,35 @@ func parseRPCMetadata(rpcMetadataStr string, rpcs []string) []*rpcConfig {

func main() {
flag.Parse()
if *enableCSMObservability {
exporter, err := prometheus.New()
if err != nil {
logger.Fatalf("Failed to start prometheus exporter: %v", err)
}
provider := metric.NewMeterProvider(
metric.WithReader(exporter),
)
var addr string
var ok bool
if addr, ok = os.LookupEnv("OTEL_EXPORTER_PROMETHEUS_HOST"); !ok {
addr = ""
}
var port string
if port, ok = os.LookupEnv("OTEL_EXPORTER_PROMETHEUS_PORT"); !ok {
port = "9464"
}
go func() {
if err := http.ListenAndServe(addr+":"+port, promhttp.Handler()); err != nil {
logger.Fatalf("error listening: %v", err)
}
}()

ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
cleanup := csm.EnableObservability(ctx, opentelemetry.Options{MetricsOptions: opentelemetry.MetricsOptions{MeterProvider: provider}})
defer cleanup()
}

rpcCfgs.Store(parseRPCMetadata(*rpcMetadata, parseRPCTypes(*rpc)))

lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *statsPort))
Expand Down Expand Up @@ -430,8 +470,16 @@ func makeOneRPC(c testgrpc.TestServiceClient, cfg *rpcConfig) (*peer.Peer, *rpcI
accStats.startRPC(cfg.typ)
switch cfg.typ {
case unaryCall:
sr := &testpb.SimpleRequest{FillServerId: true}
if *requestPayloadSize > 0 {
sr.Payload = &testpb.Payload{Body: make([]byte, *requestPayloadSize)}
}
if *responsePayloadSize > 0 {
sr.ResponseSize = int32(*responsePayloadSize)
}
sr.ResponseSize = int32(*responsePayloadSize)
var resp *testpb.SimpleResponse
resp, err = c.UnaryCall(ctx, &testpb.SimpleRequest{FillServerId: true}, grpc.Peer(&p), grpc.Header(&header))
resp, err = c.UnaryCall(ctx, sr, grpc.Peer(&p), grpc.Header(&header))
// For UnaryCall, also read hostname from response, in case the server
// isn't updated to send headers.
if resp != nil {
Expand Down
46 changes: 46 additions & 0 deletions interop/xds/go.mod
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Original file line number Diff line number Diff line change
@@ -0,0 +1,46 @@
module google.golang.org/grpc/interop/xds

go 1.21.0

replace google.golang.org/grpc => ../..

replace google.golang.org/grpc/stats/opentelemetry => ../../stats/opentelemetry

require (
github.com/prometheus/client_golang v1.19.1
go.opentelemetry.io/otel/exporters/prometheus v0.49.0
go.opentelemetry.io/otel/sdk/metric v1.27.0
google.golang.org/grpc v1.64.0
google.golang.org/grpc/stats/opentelemetry v0.0.0-20240523232201-f7d3d3eecbee
)

require (
cel.dev/expr v0.15.0 // indirect
cloud.google.com/go/compute/metadata v0.3.0 // indirect
github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.23.0 // indirect
github.com/beorn7/perks v1.0.1 // indirect
github.com/census-instrumentation/opencensus-proto v0.4.1 // indirect
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b // indirect
github.com/envoyproxy/go-control-plane v0.12.0 // indirect
github.com/envoyproxy/protoc-gen-validate v1.0.4 // indirect
github.com/go-logr/logr v1.4.2 // indirect
github.com/go-logr/stdr v1.2.2 // indirect
github.com/golang/protobuf v1.5.4 // indirect
github.com/prometheus/client_model v0.6.1 // indirect
github.com/prometheus/common v0.53.0 // indirect
github.com/prometheus/procfs v0.15.0 // indirect
go.opentelemetry.io/contrib/detectors/gcp v1.27.0 // indirect
go.opentelemetry.io/otel v1.27.0 // indirect
go.opentelemetry.io/otel/metric v1.27.0 // indirect
go.opentelemetry.io/otel/sdk v1.27.0 // indirect
go.opentelemetry.io/otel/trace v1.27.0 // indirect
golang.org/x/net v0.25.0 // indirect
golang.org/x/oauth2 v0.20.0 // indirect
golang.org/x/sync v0.7.0 // indirect
golang.org/x/sys v0.20.0 // indirect
golang.org/x/text v0.15.0 // indirect
google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 // indirect
google.golang.org/protobuf v1.34.1 // indirect
)
75 changes: 75 additions & 0 deletions interop/xds/go.sum
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Original file line number Diff line number Diff line change
@@ -0,0 +1,75 @@
cel.dev/expr v0.15.0 h1:O1jzfJCQBfL5BFoYktaxwIhuttaQPsVWerH9/EEKx0w=
cel.dev/expr v0.15.0/go.mod h1:TRSuuV7DlVCE/uwv5QbAiW/v8l5O8C4eEPHeu7gf7Sg=
cloud.google.com/go/compute/metadata v0.3.0 h1:Tz+eQXMEqDIKRsmY3cHTL6FVaynIjX2QxYC4trgAKZc=
cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.23.0 h1:yRhWveg9NbJcJYoJL4FoSauT2dxnt4N9MIAJ7tvU/mQ=
github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.23.0/go.mod h1:p2puVVSKjQ84Qb1gzw2XHLs34WQyHTYFZLaVxypAFYs=
github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/census-instrumentation/opencensus-proto v0.4.1 h1:iKLQ0xPNFxR/2hzXZMrBo8f1j86j5WHzznCCQxV/b8g=
github.com/census-instrumentation/opencensus-proto v0.4.1/go.mod h1:4T9NM4+4Vw91VeyqjLS6ao50K5bOcLKN6Q42XnYaRYw=
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b h1:ga8SEFjZ60pxLcmhnThWgvH2wg8376yUJmPhEH4H3kw=
github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b/go.mod h1:W+zGtBO5Y1IgJhy4+A9GOqVhqLpfZi+vwmdNXUehLA8=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/envoyproxy/go-control-plane v0.12.0 h1:4X+VP1GHd1Mhj6IB5mMeGbLCleqxjletLK6K0rbxyZI=
github.com/envoyproxy/go-control-plane v0.12.0/go.mod h1:ZBTaoJ23lqITozF0M6G4/IragXCQKCnYbmlmtHvwRG0=
github.com/envoyproxy/protoc-gen-validate v1.0.4 h1:gVPz/FMfvh57HdSJQyvBtF00j8JU4zdyUgIUNhlgg0A=
github.com/envoyproxy/protoc-gen-validate v1.0.4/go.mod h1:qys6tmnRsYrQqIhm2bvKZH4Blx/1gTIZ2UKVY1M+Yew=
github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/client_golang v1.19.1 h1:wZWJDwK+NameRJuPGDhlnFgx8e8HN3XHQeLaYJFJBOE=
github.com/prometheus/client_golang v1.19.1/go.mod h1:mP78NwGzrVks5S2H6ab8+ZZGJLZUq1hoULYBAYBw1Ho=
github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
github.com/prometheus/common v0.53.0 h1:U2pL9w9nmJwJDa4qqLQ3ZaePJ6ZTwt7cMD3AG3+aLCE=
github.com/prometheus/common v0.53.0/go.mod h1:BrxBKv3FWBIGXw89Mg1AeBq7FSyRzXWI3l3e7W3RN5U=
github.com/prometheus/procfs v0.15.0 h1:A82kmvXJq2jTu5YUhSGNlYoxh85zLnKgPz4bMZgI5Ek=
github.com/prometheus/procfs v0.15.0/go.mod h1:Y0RJ/Y5g5wJpkTisOtqwDSo4HwhGmLB4VQSw2sQJLHk=
github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
go.opentelemetry.io/contrib/detectors/gcp v1.27.0 h1:eVfDeFAPnMFZUhNdDZ/BbpEmC7/xxDKTSba5NhJH88s=
go.opentelemetry.io/contrib/detectors/gcp v1.27.0/go.mod h1:amd+4uZxqJAUx7zI1JvygUtAc2EVWtQeyz8D+3161SQ=
go.opentelemetry.io/otel v1.27.0 h1:9BZoF3yMK/O1AafMiQTVu0YDj5Ea4hPhxCs7sGva+cg=
go.opentelemetry.io/otel v1.27.0/go.mod h1:DMpAK8fzYRzs+bi3rS5REupisuqTheUlSZJ1WnZaPAQ=
go.opentelemetry.io/otel/exporters/prometheus v0.49.0 h1:Er5I1g/YhfYv9Affk9nJLfH/+qCCVVg1f2R9AbJfqDQ=
go.opentelemetry.io/otel/exporters/prometheus v0.49.0/go.mod h1:KfQ1wpjf3zsHjzP149P4LyAwWRupc6c7t1ZJ9eXpKQM=
go.opentelemetry.io/otel/metric v1.27.0 h1:hvj3vdEKyeCi4YaYfNjv2NUje8FqKqUY8IlF0FxV/ik=
go.opentelemetry.io/otel/metric v1.27.0/go.mod h1:mVFgmRlhljgBiuk/MP/oKylr4hs85GZAylncepAX/ak=
go.opentelemetry.io/otel/sdk v1.27.0 h1:mlk+/Y1gLPLn84U4tI8d3GNJmGT/eXe3ZuOXN9kTWmI=
go.opentelemetry.io/otel/sdk v1.27.0/go.mod h1:Ha9vbLwJE6W86YstIywK2xFfPjbWlCuwPtMkKdz/Y4A=
go.opentelemetry.io/otel/sdk/metric v1.27.0 h1:5uGNOlpXi+Hbo/DRoI31BSb1v+OGcpv2NemcCrOL8gI=
go.opentelemetry.io/otel/sdk/metric v1.27.0/go.mod h1:we7jJVrYN2kh3mVBlswtPU22K0SA+769l93J6bsyvqw=
go.opentelemetry.io/otel/trace v1.27.0 h1:IqYb813p7cmbHk0a5y6pD5JPakbVfftRXABGt5/Rscw=
go.opentelemetry.io/otel/trace v1.27.0/go.mod h1:6RiD1hkAprV4/q+yd2ln1HG9GoPx39SuvvstaLBl+l4=
golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
golang.org/x/oauth2 v0.20.0 h1:4mQdhULixXKP1rwYBW0vAijoXnkTG0BLCDRzfe1idMo=
golang.org/x/oauth2 v0.20.0/go.mod h1:XYTD2NtWslqkgxebSiOHnXEap4TF09sJSc7H1sXbhtI=
golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157 h1:7whR9kGa5LUwFtpLm2ArCEejtnxlGeLbAyjFY8sGNFw=
google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157/go.mod h1:99sLkeliLXfdj2J75X3Ho+rrVCaJze0uwN7zDDkjPVU=
google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 h1:Zy9XzmMEflZ/MAaA7vNcoebnRAld7FsPW1EeBB7V0m8=
google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157/go.mod h1:EfXuqaE1J41VCDicxHzUDm+8rk+7ZdXzHV0IhO/I6s0=
google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
6 changes: 3 additions & 3 deletions interop/xds/server/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -24,13 +24,13 @@ COPY . .

# Build a static binary without cgo so that we can copy just the binary in the
# final image, and can get rid of the Go compiler and gRPC-Go dependencies.
RUN go build -tags osusergo,netgo interop/xds/server/server.go
RUN cd interop/xds/server && go build -tags osusergo,netgo .

# Second stage of the build which copies over only the client binary and skips
# Second stage of the build which copies over only the server binary and skips
# the Go compiler and gRPC repo from the earlier stage. This significantly
# reduces the docker image size.
FROM alpine
COPY --from=build /go/src/grpc-go/server .
COPY --from=build /go/src/grpc-go/interop/xds/server/server .
ENV GRPC_GO_LOG_VERBOSITY_LEVEL=99
ENV GRPC_GO_LOG_SEVERITY_LEVEL="info"
ENV GRPC_GO_LOG_FORMATTER="json"
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