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fuchsia/third_party/github.com/grpc/grpc-go/refs/heads/upstream/master
commit
216640cad7394846427b78a276dc5371cdca840d
[log]
author
Madhav Bissa <48023579+mbissa@users.noreply.github.com>
Sat Jul 25 02:22:24 2026 +0530
committer
GitHub <noreply@github.com>
Sat Jul 25 02:22:24 2026 +0530
tree
956fa60f3a13d2ad2595dcd5036c0962b980b155
parent
2cb274b7aafb7bd54891ede276c6da0dad7f3c54 [diff]
metadata: re-add MD.String with redaction of sensitive metadata (#9231)

Fixes #7395

MD.String was removed in #7372 because it could leak credentials orother
sensitive metadata when an MD was logged (e.g. via log(md)).etcd, the
main consumer relying on the old behavior, has since stoppeddepending on
it, so it is safe to re-add. This restores MD.String in aredacting form:
it prints keys and values only for a fixed allowlist ofnon-sensitive
gRPC/HTTP2 protocol headers, and omits (best effort) every other
keyentirely (key name included, since a key name may itself be
sensitive),reporting only the count as <N redacted>.

RELEASE NOTES:
* metadata: re-add MD.String, which now prints only an allowlist of
non-sensitive protocol headers and redacts all other metadata, to help
avoid accidentally logging credentials or other sensitive data
2 files changed
tree: 956fa60f3a13d2ad2595dcd5036c0962b980b155
  1. .gemini/
  2. .github/
  3. admin/
  4. attributes/
  5. authz/
  6. backoff/
  7. balancer/
  8. benchmark/
  9. binarylog/
  10. channelz/
  11. cmd/
  12. codes/
  13. connectivity/
  14. credentials/
  15. Documentation/
  16. encoding/
  17. examples/
  18. experimental/
  19. gcp/
  20. grpclog/
  21. health/
  22. internal/
  23. interop/
  24. keepalive/
  25. mem/
  26. metadata/
  27. orca/
  28. peer/
  29. profiling/
  30. reflection/
  31. resolver/
  32. scripts/
  33. security/
  34. serviceconfig/
  35. stats/
  36. status/
  37. tap/
  38. test/
  39. testdata/
  40. xds/
  41. AUTHORS
  42. backoff.go
  43. balancer_wrapper.go
  44. balancer_wrapper_test.go
  45. call.go
  46. clientconn.go
  47. clientconn_authority_test.go
  48. clientconn_disconnect_reason_noplan9.go
  49. clientconn_disconnect_reason_plan9.go
  50. clientconn_parsed_target_test.go
  51. clientconn_test.go
  52. CODE-OF-CONDUCT.md
  53. codec.go
  54. codec_test.go
  55. CONTRIBUTING.md
  56. default_dial_option_server_option_test.go
  57. dial_test.go
  58. dialoptions.go
  59. doc.go
  60. go.mod
  61. go.sum
  62. GOVERNANCE.md
  63. grpc_test.go
  64. interceptor.go
  65. LICENSE
  66. MAINTAINERS.md
  67. Makefile
  68. NOTICE.txt
  69. picker_wrapper.go
  70. picker_wrapper_test.go
  71. preloader.go
  72. producer_ext_test.go
  73. README.md
  74. resolver_balancer_ext_test.go
  75. resolver_test.go
  76. resolver_wrapper.go
  77. rpc_util.go
  78. rpc_util_test.go
  79. SECURITY.md
  80. server.go
  81. server_ext_test.go
  82. server_test.go
  83. service_config.go
  84. service_config_test.go
  85. stream.go
  86. stream_interfaces.go
  87. stream_test.go
  88. trace.go
  89. trace_notrace.go
  90. trace_test.go
  91. trace_withtrace.go
  92. version.go
README.md

gRPC-Go

GoDoc GoReportCard codecov

The Go implementation of gRPC: A high performance, open source, general RPC framework that puts mobile and HTTP/2 first. For more information see the Go gRPC docs, or jump directly into the quick start.

Prerequisites

Installation

Simply add the following import to your code, and then go [build|run|test] will automatically fetch the necessary dependencies:

import "google.golang.org/grpc"

Note: If you are trying to access grpc-go from China, see the FAQ below.

Learn more

FAQ

I/O Timeout Errors

The golang.org domain may be blocked from some countries. go get usually produces an error like the following when this happens:

$ go get -u google.golang.org/grpc
package google.golang.org/grpc: unrecognized import path "google.golang.org/grpc" (https fetch: Get https://google.golang.org/grpc?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)

To build Go code, there are several options:

  • Set up a VPN and access google.golang.org through that.

  • With Go module support: it is possible to use the replace feature of go mod to create aliases for golang.org packages. In your project's directory:

    go mod edit -replace=google.golang.org/grpc=github.com/grpc/grpc-go@latest
go mod tidy
go mod vendor
go build -mod=vendor

    Again, this will need to be done for all transitive dependencies hosted on golang.org as well. For details, refer to golang/go issue #28652.

Compiling error, undefined: grpc.SupportPackageIsVersion

Please update to the latest version of gRPC-Go using go get google.golang.org/grpc.

How to turn on logging

The default logger is controlled by environment variables. Turn everything on like this:

$ export GRPC_GO_LOG_VERBOSITY_LEVEL=99
$ export GRPC_GO_LOG_SEVERITY_LEVEL=info

The RPC failed with error "code = Unavailable desc = transport is closing"

This error means the connection the RPC is using was closed, and there are many possible reasons, including:

  1. mis-configured transport credentials, connection failed on handshaking
  2. bytes disrupted, possibly by a proxy in between
  3. server shutdown
  4. Keepalive parameters caused connection shutdown, for example if you have configured your server to terminate connections regularly to trigger DNS lookups. If this is the case, you may want to increase your MaxConnectionAgeGrace, to allow longer RPC calls to finish.

It can be tricky to debug this because the error happens on the client side but the root cause of the connection being closed is on the server side. Turn on logging on both client and server, and see if there are any transport errors.