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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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| // Copyright 2021 Google LLC. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
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| // 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. | ||
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| //go:build enablexds | ||
| // +build enablexds | ||
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| package grpc | ||
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| import ( | ||
| // Install google-c2p resolver, which is required for direct path. | ||
| _ "google.golang.org/grpc/xds/googledirectpath" | ||
| ) |