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feat(transport): add google-c2p dependence to DirectPath (#1260)
DirectPath is migrating to Traffic Director, and we want to setup E2E tests based on TD for Bigtable and Spanner. This PR:
1. Update grpc-go version to 1.41.0, which has RING_HASH LB policy support;
2. Add the google-c2p resolver dependence to google-api-go-client;
3. Add an environment variable GOOGLE_CLOUD_ENABLE_DIRECT_PATH_XDS to enable using DirectPath over TD;
Corresponding PR in gax-java: googleapis/gax-java#1521.

Also note that currently there is a bug in grpc-go, and fix is grpc/grpc-go#4889. I have verified that with this fix Bigtable E2E test over DirectPath Traffic Director can pass. This PR has been merged to grpc-go and will release in grpc-go 1.42.0, which will be the minimal version for supporting `google-c2p` URI scheme.
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mohanli-ml committed Oct 28, 2021
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16 changes: 16 additions & 0 deletions go.sum
Expand Up @@ -46,26 +46,34 @@ cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
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Expand Down Expand Up @@ -138,6 +146,7 @@ github.com/google/pprof v0.0.0-20210601050228-01bbb1931b22/go.mod h1:kpwsk12EmLe
github.com/google/pprof v0.0.0-20210609004039-a478d1d731e9/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
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github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
Expand All @@ -152,17 +161,22 @@ github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:
github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
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github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
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github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
Expand Down Expand Up @@ -536,10 +550,12 @@ google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQ
google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
Expand Down
52 changes: 29 additions & 23 deletions transport/grpc/dial.go
Expand Up @@ -12,6 +12,8 @@ import (
"crypto/tls"
"errors"
"log"
"net"
"os"
"strings"

"cloud.google.com/go/compute/metadata"
Expand All @@ -29,6 +31,9 @@ import (
_ "google.golang.org/grpc/balancer/grpclb"
)

// Check env to decide if using google-c2p resolver for DirectPath traffic.
const enableDirectPathXds = "GOOGLE_CLOUD_ENABLE_DIRECT_PATH_XDS"

// Set at init time by dial_appengine.go. If nil, we're not on App Engine.
var appengineDialerHook func(context.Context) grpc.DialOption

Expand Down Expand Up @@ -134,23 +139,32 @@ func dial(ctx context.Context, insecure bool, o *internal.DialSettings) (*grpc.C
o.QuotaProject = internal.QuotaProjectFromCreds(creds)
}

// Attempt Direct Path only if:
// * The endpoint is a host:port (or dns:///host:port).
// * Credentials are obtained via GCE metadata server, using the default
// service account.
// Attempt Direct Path:
if o.EnableDirectPath && checkDirectPathEndPoint(endpoint) && isTokenSourceDirectPathCompatible(creds.TokenSource, o) && metadata.OnGCE() {
if !strings.HasPrefix(endpoint, "dns:///") {
endpoint = "dns:///" + endpoint
}
grpcOpts = []grpc.DialOption{
grpc.WithCredentialsBundle(
grpcgoogle.NewComputeEngineCredentials(),
),
// For now all DirectPath go clients will be using the following lb config, but in future
// when different services need different configs, then we should change this to a
// per-service config.
grpc.WithDisableServiceConfig(),
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig":[{"grpclb":{"childPolicy":[{"pick_first":{}}]}}]}`),
grpc.WithCredentialsBundle(grpcgoogle.NewComputeEngineCredentials())}
if timeoutDialerOption != nil {
grpcOpts = append(grpcOpts, timeoutDialerOption)
}
// Check if google-c2p resolver is enabled for DirectPath
// TODO(mohanli): remove grpc version guard once google-api-go-client is able to depends on the latest grpc
if grpc.Version >= "1.42" && strings.EqualFold(os.Getenv(enableDirectPathXds), "true") {
// google-c2p resolver target must not have a port number
if addr, _, err := net.SplitHostPort(endpoint); err == nil {
endpoint = "google-c2p:///" + addr
} else {
endpoint = "google-c2p:///" + endpoint
}
} else {
if !strings.HasPrefix(endpoint, "dns:///") {
endpoint = "dns:///" + endpoint
}
grpcOpts = append(grpcOpts,
// For now all DirectPath go clients will be using the following lb config, but in future
// when different services need different configs, then we should change this to a
// per-service config.
grpc.WithDisableServiceConfig(),
grpc.WithDefaultServiceConfig(`{"loadBalancingConfig":[{"grpclb":{"childPolicy":[{"pick_first":{}}]}}]}`))
}
// TODO(cbro): add support for system parameters (quota project, request reason) via chained interceptor.
} else {
Expand Down Expand Up @@ -183,14 +197,6 @@ func dial(ctx context.Context, insecure bool, o *internal.DialSettings) (*grpc.C
grpcOpts = append(grpcOpts, grpc.WithUserAgent(o.UserAgent))
}

// TODO(weiranf): This socketopt dialer will be used by default at some
// point when isDirectPathEnabled will default to true, we guard it by
// the Directpath env var for now once we can introspect user defined
// dialer (https://github.com/grpc/grpc-go/issues/2795).
if timeoutDialerOption != nil && o.EnableDirectPath && checkDirectPathEndPoint(endpoint) && metadata.OnGCE() {
grpcOpts = append(grpcOpts, timeoutDialerOption)
}

return grpc.DialContext(ctx, endpoint, grpcOpts...)
}

Expand Down
17 changes: 17 additions & 0 deletions transport/grpc/dial_enablexds.go
@@ -0,0 +1,17 @@
// Copyright 2021 Google LLC.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package grpc supports network connections to GRPC servers.
// This package is not intended for use by end developers. Use the
// google.golang.org/api/option package to configure API clients.

//go:build enablexds
// +build enablexds

package grpc

import (
// Install google-c2p resolver, which is required for direct path.
_ "google.golang.org/grpc/xds/googledirectpath"
)

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