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![Nguyễn Thái Ngọc Duy](/assets/img/avatar_default.png)
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
258 lines
6.1 KiB
C
258 lines
6.1 KiB
C
/*
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* Simple text-based progress display module for GIT
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*
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* Copyright (c) 2007 by Nicolas Pitre <nico@fluxnic.net>
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*
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* This code is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "git-compat-util.h"
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#include "gettext.h"
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#include "progress.h"
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#include "strbuf.h"
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#define TP_IDX_MAX 8
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struct throughput {
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off_t curr_total;
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off_t prev_total;
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struct timeval prev_tv;
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unsigned int avg_bytes;
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unsigned int avg_misecs;
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unsigned int last_bytes[TP_IDX_MAX];
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unsigned int last_misecs[TP_IDX_MAX];
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unsigned int idx;
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char display[32];
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};
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struct progress {
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const char *title;
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int last_value;
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unsigned total;
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unsigned last_percent;
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unsigned delay;
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unsigned delayed_percent_treshold;
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struct throughput *throughput;
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};
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static volatile sig_atomic_t progress_update;
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static void progress_interval(int signum)
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{
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progress_update = 1;
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}
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static void set_progress_signal(void)
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{
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struct sigaction sa;
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struct itimerval v;
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progress_update = 0;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = progress_interval;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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sigaction(SIGALRM, &sa, NULL);
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v.it_interval.tv_sec = 1;
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v.it_interval.tv_usec = 0;
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v.it_value = v.it_interval;
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setitimer(ITIMER_REAL, &v, NULL);
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}
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static void clear_progress_signal(void)
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{
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struct itimerval v = {{0,},};
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setitimer(ITIMER_REAL, &v, NULL);
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signal(SIGALRM, SIG_IGN);
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progress_update = 0;
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}
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static int display(struct progress *progress, unsigned n, const char *done)
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{
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const char *eol, *tp;
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if (progress->delay) {
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if (!progress_update || --progress->delay)
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return 0;
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if (progress->total) {
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unsigned percent = n * 100 / progress->total;
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if (percent > progress->delayed_percent_treshold) {
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/* inhibit this progress report entirely */
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clear_progress_signal();
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progress->delay = -1;
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progress->total = 0;
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return 0;
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}
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}
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}
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progress->last_value = n;
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tp = (progress->throughput) ? progress->throughput->display : "";
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eol = done ? done : " \r";
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if (progress->total) {
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unsigned percent = n * 100 / progress->total;
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if (percent != progress->last_percent || progress_update) {
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progress->last_percent = percent;
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fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
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progress->title, percent, n,
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progress->total, tp, eol);
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fflush(stderr);
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progress_update = 0;
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return 1;
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}
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} else if (progress_update) {
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fprintf(stderr, "%s: %u%s%s", progress->title, n, tp, eol);
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fflush(stderr);
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progress_update = 0;
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return 1;
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}
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return 0;
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}
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static void throughput_string(struct strbuf *buf, off_t total,
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unsigned int rate)
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{
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strbuf_addstr(buf, ", ");
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strbuf_humanise_bytes(buf, total);
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strbuf_addstr(buf, " | ");
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strbuf_humanise_bytes(buf, rate * 1024);
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strbuf_addstr(buf, "/s");
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}
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void display_throughput(struct progress *progress, off_t total)
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{
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struct throughput *tp;
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struct timeval tv;
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unsigned int misecs;
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if (!progress)
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return;
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tp = progress->throughput;
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gettimeofday(&tv, NULL);
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if (!tp) {
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progress->throughput = tp = calloc(1, sizeof(*tp));
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if (tp) {
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tp->prev_total = tp->curr_total = total;
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tp->prev_tv = tv;
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}
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return;
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}
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tp->curr_total = total;
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/*
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* We have x = bytes and y = microsecs. We want z = KiB/s:
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*
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* z = (x / 1024) / (y / 1000000)
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* z = x / y * 1000000 / 1024
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* z = x / (y * 1024 / 1000000)
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* z = x / y'
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*
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* To simplify things we'll keep track of misecs, or 1024th of a sec
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* obtained with:
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*
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* y' = y * 1024 / 1000000
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* y' = y / (1000000 / 1024)
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* y' = y / 977
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*/
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misecs = (tv.tv_sec - tp->prev_tv.tv_sec) * 1024;
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misecs += (int)(tv.tv_usec - tp->prev_tv.tv_usec) / 977;
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if (misecs > 512) {
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struct strbuf buf = STRBUF_INIT;
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unsigned int count, rate;
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count = total - tp->prev_total;
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tp->prev_total = total;
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tp->prev_tv = tv;
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tp->avg_bytes += count;
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tp->avg_misecs += misecs;
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rate = tp->avg_bytes / tp->avg_misecs;
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tp->avg_bytes -= tp->last_bytes[tp->idx];
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tp->avg_misecs -= tp->last_misecs[tp->idx];
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tp->last_bytes[tp->idx] = count;
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tp->last_misecs[tp->idx] = misecs;
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tp->idx = (tp->idx + 1) % TP_IDX_MAX;
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throughput_string(&buf, total, rate);
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strncpy(tp->display, buf.buf, sizeof(tp->display));
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strbuf_release(&buf);
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if (progress->last_value != -1 && progress_update)
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display(progress, progress->last_value, NULL);
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}
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}
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int display_progress(struct progress *progress, unsigned n)
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{
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return progress ? display(progress, n, NULL) : 0;
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}
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struct progress *start_progress_delay(const char *title, unsigned total,
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unsigned percent_treshold, unsigned delay)
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{
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struct progress *progress = malloc(sizeof(*progress));
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if (!progress) {
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/* unlikely, but here's a good fallback */
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fprintf(stderr, "%s...\n", title);
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fflush(stderr);
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return NULL;
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}
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progress->title = title;
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progress->total = total;
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progress->last_value = -1;
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progress->last_percent = -1;
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progress->delayed_percent_treshold = percent_treshold;
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progress->delay = delay;
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progress->throughput = NULL;
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set_progress_signal();
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return progress;
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}
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struct progress *start_progress(const char *title, unsigned total)
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{
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return start_progress_delay(title, total, 0, 0);
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}
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void stop_progress(struct progress **p_progress)
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{
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stop_progress_msg(p_progress, _("done"));
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}
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void stop_progress_msg(struct progress **p_progress, const char *msg)
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{
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struct progress *progress = *p_progress;
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if (!progress)
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return;
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*p_progress = NULL;
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if (progress->last_value != -1) {
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/* Force the last update */
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char buf[128], *bufp;
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size_t len = strlen(msg) + 5;
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struct throughput *tp = progress->throughput;
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bufp = (len < sizeof(buf)) ? buf : xmalloc(len + 1);
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if (tp) {
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struct strbuf strbuf = STRBUF_INIT;
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unsigned int rate = !tp->avg_misecs ? 0 :
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tp->avg_bytes / tp->avg_misecs;
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throughput_string(&strbuf, tp->curr_total, rate);
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strncpy(tp->display, strbuf.buf, sizeof(tp->display));
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strbuf_release(&strbuf);
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}
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progress_update = 1;
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sprintf(bufp, ", %s.\n", msg);
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display(progress, progress->last_value, bufp);
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if (buf != bufp)
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free(bufp);
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}
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clear_progress_signal();
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free(progress->throughput);
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free(progress);
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}
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