Zac Bergquist 25ee7b1343 Convert tsh play to a streaming API (#34547) ...

* Convert tsh play to use the new streaming API

Instead of downloading the entire session before starting playback,
tsh now streams the recording directly to the terminal. This results
in a significant reduction in "time to first byte" when playing back
large session recordings.

This has the side effect of making playback of SSH consistent with
that of desktop sessions (we no longer "skip" dead time for SSH
sessions and instead play them back at true speed). Additionally,
a new CLI flag was added to support configurable playback speeds.

Fixes #10579
Closes #11385
Updates gravitational/teleport-private#1024

* Start to phase out the GetSessionEvents API

- Mark the old HTTP client implementations as not implemented.
  Nothing is calling these, but they remain for now until we can
  fully remove them from the ClientI interface.
- Move `tsh play --format=json` over to a streaming approach.
  This ensures that we don't load the entire session into memory
  before converting it to JSON/YAML format.

* Clean up terminal escape codes

- Move more utilities into lib/client.Terminal
- Stop timestamping the frame by moving the cursor and writing
  to the terminal - this is racy. Write the timestamp to the
  terminal title instead.

* Update changelog

* Move terminal functions from Unix to common build

This is valid because we initialize terminals on Windows with
ENABLE_VIRTUAL_TERMINAL_PROCESSING, so the same escape sequences
that work on Unix will also work on Windows.

This matches Microsoft's recommendation to use virtual terminal
sequences over the Windows Console API [1].

For more info, see: https://learn.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences

[1] https://learn.microsoft.com/en-us/windows/console/classic-vs-vt

2024-01-02 19:57:12 +00:00

..

session.go

Convert tsh play to a streaming API (#34547)

2024-01-02 19:57:12 +00:00