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package com.it_jaros.jscanner;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class ProgressBar {
private final List<Progress> hosts = new ArrayList<>();
private final ReentrantLock lock = new ReentrantLock();
private final ScheduledExecutorService ui = Executors.newSingleThreadScheduledExecutor();
private final boolean quiet;
private final int columnWidth = ProgressBar.getColumnWidth();
public ProgressBar(boolean quiet) {
this.quiet = quiet;
}
private static int getColumnWidth() {
try {
Process process = new ProcessBuilder("sh", "-c", "stty size < /dev/tty").start();
try (BufferedReader reader = new BufferedReader(
new InputStreamReader(process.getInputStream()))) {
String line = reader.readLine();
if (line != null && !line.isBlank()) {
Matcher matcher = Pattern.compile("^\\d+\\s+(\\d+)").matcher(line.trim());
if (matcher.matches()) {
return Integer.parseInt(matcher.group(1));
}
}
}
} catch (Exception ignored) {
// does not matter why it did not work
}
return 120;
}
public void start() {
if (!quiet) {
System.out.print("Scanning targets...\n\n");
}
// although we don't print anything, we still need to
// gc all the done hosts
ui.scheduleAtFixedRate(() -> {
lock.lock();
drawProgress(false);
lock.unlock();
}, 1, 500, TimeUnit.MILLISECONDS);
}
private void drawProgress(boolean last) {
// find and print finished hosts one last time
for (Iterator<Progress> it = hosts.iterator(); it.hasNext(); ) {
Progress p = it.next();
if (p.done().get() == p.total()) {
it.remove();
drawBar(p);
}
}
// the more progressed the host the more up it is
hosts.sort(Comparator.comparingInt((Progress p) -> p.done().get()).reversed());
for (Progress progress : hosts) {
drawBar(progress);
}
if (!last) {
// move cursor up again
if (!quiet) {
System.out.print("\u001b[" + hosts.size() + "A");
}
}
}
public void add(Progress progress) {
lock.lock();
hosts.add(progress);
lock.unlock();
}
private void drawBar(Progress progress) {
if (quiet) return;
System.out.print("\u001b[2K\r"); // clear whole line
System.out.println(createBar(
progress.host(),
progress.open().get(),
progress.filtered().get(),
progress.done().get(),
progress.total()));
}
public String createBar(String label, int open, int filtered, int done, int total) {
int terminalWidth = columnWidth;
int bracketWidth = terminalWidth / 3;
double pct = total == 0 ? 1.0 : (done / (double) total);
int percent = (int) (pct * 100);
String statsLeft = String.format("open:%d filtered:%d (%d/%d)", open, filtered, done, total);
String statsRight = String.format("%3d%%", percent);
int filled = (int) (pct * bracketWidth);
String brackets = "[" + "#".repeat(filled) + "-".repeat(bracketWidth - filled) + "]";
int spacesBetween = terminalWidth - bracketWidth - (label + statsLeft + statsRight).length() - 5;
return String.format("%s%s%s %s %s", label, " ".repeat(spacesBetween), statsLeft, brackets, statsRight);
}
public void stop() {
ui.shutdown();
try {
ui.awaitTermination(1, TimeUnit.SECONDS);
// we need to draw one last time for the 100% to appear
drawProgress(true);
} catch (InterruptedException ignored) {
Thread.currentThread().interrupt();
}
}
}
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