crypto/tls: document that ConnectionState is valid only after handshake

Conn.ConnectionState reports details that are only populated once the
TLS handshake has completed. Callers that read it immediately after
Accept (for example via tls.NewListener) instead observe an
unpopulated ConnectionState whose HandshakeComplete field is false.

Document this precondition on Conn.ConnectionState and point to
ConnectionState.HandshakeComplete and Conn.Handshake, which the first
Conn.Read or Conn.Write runs automatically.

Fixes #79828.

Change-Id: Iad8a446ae45c7eb45efba6f8c1ce50fa727db989
GitHub-Last-Rev: a9ea8721fe40ffaa44bdab16504f04212ce9980b
GitHub-Pull-Request: golang/go#80081
Reviewed-on: https://go-review.googlesource.com/c/go/+/792720
Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
1 file changed
tree: dbf874069967cf1bb99f913bde517e40ed94e71b
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 4.0 Attribution license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

Download and Install

Binary Distributions

Official binary distributions are available at https://go.dev/dl/.

After downloading a binary release, visit https://go.dev/doc/install for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://go.dev/doc/install/source for source installation instructions.

Contributing

Go is the work of thousands of contributors. We appreciate your help!

To contribute, please read the contribution guidelines at https://go.dev/doc/contribute.

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://go.dev/wiki/Questions for a list of places to ask questions about the Go language.