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util/progresstracking: add Ticker, NewWriter, and CountingWriter

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Add three new helpers to the existing progresstracking package:

  - Ticker: spawns a 1 Hz goroutine that calls a report function with
    the current value of an atomic counter and a total. Returns a stop
    function (safe to call multiple times via sync.OnceFunc) that fires
    one final report and blocks until the goroutine exits.

  - NewWriter: wraps an io.Writer and calls onProgress at most once per
    interval with the cumulative byte count.

  - CountingWriter: an io.Writer that atomically counts bytes written,
    for use with Ticker.

These will be used by the appliance flash and OTA update code in
subsequent commits.

Updates #1866

Change-Id: If353cea6506f5351b6fb19bfdb7bc9b78fe7855e
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2026-07-01 10:02:05 -07:00
committed by Brad Fitzpatrick
parent d0fcb668d5
commit a8f3c861a4
7 changed files with 122 additions and 111 deletions
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cmd/tailscaled/depaware.txt
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@@ -469,7 +469,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
W 💣 tailscale.com/util/osdiag/internal/wsc from tailscale.com/util/osdiag
tailscale.com/util/osshare from tailscale.com/cmd/tailscaled+
tailscale.com/util/osuser from tailscale.com/ipn/ipnlocal+
tailscale.com/util/progresstracking from tailscale.com/feature/taildrop
tailscale.com/util/progresstracking from tailscale.com/feature/taildrop+
tailscale.com/util/race from tailscale.com/net/dns/resolver
tailscale.com/util/racebuild from tailscale.com/logpolicy
tailscale.com/util/rands from tailscale.com/ipn/ipnlocal+