RPI-Clock/ntp-tail at main · jkeychan/RPI-Clock · GitHub

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#!/usr/bin/env python3
"""Tail NTP tracking log and print live formatted updates."""
import json
import subprocess
import sys

FIX = {1: "none", 2: "2D", 3: "3D"}

HDR = ("%-20s  %9s  %9s  %9s  %8s  %6s  %7s  %5s  %5s  %3s  %4s  %7s  %s"
       % ("TIME", "SYS_ns", "RMS_us", "PPS_ns", "JIT_ns", "TEMP", "GW_ms",
          "HDOP", "TDOP", "SAT", "FIX", "SCORE", "REF"))

proc = subprocess.Popen(
    ["tail", "-f", "/var/log/ntp-tracking/tracking.jsonl"],
    stdout=subprocess.PIPE, text=True
)
print(HDR, flush=True)
try:
    for line in proc.stdout:
        d = json.loads(line.strip())
        so     = d.get("sys_offset_ns") or 0
        rms    = d.get("rms_offset_us") or 0
        pps    = d.get("pps_offset_ns") or 0
        j      = d.get("pps_jitter_ns") or 0
        temp   = d.get("temp_c", "?")
        gw     = d.get("ping_gw_ms", "?")
        hdop   = d.get("gps_hdop")
        tdop   = d.get("gps_tdop")
        sats   = d.get("gps_sats")
        fix    = FIX.get(d.get("gps_fix"), "?")
        ref    = d.get("ref", "?")
        score  = d.get("ntppool_score")
        hdop_s  = "%5.2f" % hdop  if hdop  is not None else "    ?"
        tdop_s  = "%5.1f" % tdop  if tdop  is not None else "    ?"
        sats_s  = "%3d"   % sats  if sats  is not None else "  ?"
        score_s = "%7.2f" % score if score is not None else "      ?"
        print("%-20s  %+9d  %9.1f  %+9d  %8.1f  %6s  %7s  %s  %s  %s  %4s  %s  %s"
              % (d["ts"], so, rms, pps, j, temp, gw,
                 hdop_s, tdop_s, sats_s, fix, score_s, ref), flush=True)
except KeyboardInterrupt:
    proc.terminate()