Add interactive log viewer

assets/javascripts/anser-import.js

@@ -3,3 +3,6 @@ const module = {};
 function ansiToHtml(data) {
   return Anser.linkify(Anser.ansiToHtml(Anser.escapeForHtml(data), {use_classes: true}));
 }
+function ansiToText(data) {
+  return Anser.ansiToText(data);
+}

assets/javascripts/test_result.js

@@ -578,14 +578,97 @@ function setupResult(jobid, state, result, status_url) {
   setInfoPanelClassName(state, result);
 }
 
-function loadEmbeddedLogFiles() {
+function delay(callback, ms) {
+  let timer;
+  return function () {
+    clearTimeout(timer);
+    timer = setTimeout(callback.bind(this, ...arguments), ms || 0);
+  };
+}
+
+function filterLogLines(input) {
+  if (input === undefined) {
+    return;
+  }
+  const string = input.value;
+  let regex = undefined;
+  const match = string.match(/^\/(.*)\/([i]*)$/);
+  if (match) {
+    regex = new RegExp(match[1], match[2]);
+  }
+  displaySearchInfo('Searching…');
+  $('.embedded-logfile').each(function (index, logFileElement) {
+    let content = logFileElement.dataset.content;
+    if (content === undefined) {
+      return;
+    }
+    if (string.length > 0) {
+      const lines = content.split(/\r?\n/);
+      const wanted = [];
+      for (const line of lines) {
+        if (regex) {
+          // For searching for /^something/ we need to remove ansi control characters
+          const text = ansiToText(line);
+          if (text.match(regex)) {
+            wanted.push(line);
+          }
+          continue;
+        }
+        if (line.includes(string)) {
+          wanted.push(line);
+        }
+      }
+      content = wanted.join('\n');
+      displaySearchInfo(`Showing ${wanted.length} / ${lines.length} lines`);
+    } else {
+      displaySearchInfo('');
+    }
+    logFileElement.innerHTML = ansiToHtml(content);
+  });
+  const fullCurrentUrl = window.location.href;
+  const urlParts = fullCurrentUrl.split('#');
+  const currentUrl = urlParts[0];
+  const fragment = urlParts[1];
+  if (string.length > 0) {
+    window.location.href = `${currentUrl}#filter=${encodeURIComponent(string)}`;
+  } else if (fragment) {
+    // leaving off the # here would reload the page
+    window.location.href = currentUrl + '#';
+  }
+}
+
+function filterEmbeddedLogFiles() {
+  const searchBox = document.getElementById('filter-log-file');
+  if (searchBox) {
+    const currentUrl = window.location.href;
+    const fragment = currentUrl.split('#')[1];
+    if (fragment) {
+      const params = fragment.split('&');
+      for (let i = 0; i < params.length; i++) {
+        const keyval = params[i].split('=');
+        if (keyval[0] === 'filter') {
+          searchBox.value = decodeURIComponent(keyval[1]);
+        }
+      }
+    }
+  }
+  const filter = filterLogLines.bind(null, searchBox);
+  loadEmbeddedLogFiles(filter);
+}
+
+function loadEmbeddedLogFiles(filter) {
   $('.embedded-logfile').each(function (index, logFileElement) {
     if (logFileElement.dataset.contentsLoaded) {
       return;
     }
     $.ajax(logFileElement.dataset.src)
       .done(function (response) {
-        logFileElement.innerHTML = ansiToHtml(response);
+        logFileElement.dataset.content = response;
+        if (filter) {
+          filter();
+        } else {
+          logFileElement.innerHTML = ansiToHtml(response);
+        }
         logFileElement.dataset.contentsLoaded = true;
       })
       .fail(function (jqXHR, textStatus, errorThrown) {
@@ -594,6 +677,20 @@ function loadEmbeddedLogFiles() {
   });
 }
 
+window.onload = function () {
+  const searchBox = document.getElementById('filter-log-file');
+  if (!searchBox) {
+    return;
+  }
+  const filter = filterLogLines.bind(null, searchBox);
+  searchBox.addEventListener('keyup', delay(filter), 1000);
+  searchBox.addEventListener('change', filter, false);
+};
+
+function displaySearchInfo(text) {
+  document.getElementById('filter-info').innerHTML = text;
+}
+
 function setCurrentPreviewFromStepLinkIfPossible(stepLink) {
   if (tabConfiguration.details.hasContents && !stepLink.parent().is('.current_preview')) {
     setCurrentPreview(stepLink.parent());

t/ui/18-tests-details.t

@@ -483,6 +483,18 @@ subtest 'misc details: title, favicon, go back, go to source view, go to log vie
 
     wait_for_ajax msg => 'log contents';
     like $driver->find_element('.embedded-logfile .ansi-blue-fg')->get_text, qr/send(autotype|key)/, 'log is colorful';
+    like $driver->find_element('.embedded-logfile')->get_text, qr{/usr/bin/qemu-kvm}, 'qemu-kvm is shown in log viewer';
+
+    $driver->find_element('#filter-log-file')->send_keys('kate');
+    like $driver->find_element('#filter-info')->get_text, qr{Showing 3 / 1292 lines},
+      'Showing filter result info for substring';
+    unlike $driver->find_element('.embedded-logfile')->get_text, qr{/usr/bin/qemu-kvm},
+      'qemu-kvm is not shown when filtering for something else';
+    $driver->find_element('#filter-log-file')->clear;
+    like $driver->find_element('#filter-info')->get_text, qr{^$}, 'Filter result info cleared';
+    $driver->find_element('#filter-log-file')->send_keys('/kate-[12]/');
+    like $driver->find_element('#filter-info')->get_text, qr{Showing 2 / 1292 lines},
+      'Showing filter result info for regex';
 };
 
 my $t = Test::Mojo->new('OpenQA::WebAPI');

templates/webapi/test/logfile.html.ep

@@ -5,11 +5,13 @@
 %= asset $_ for qw(test_result.js anser.js ansi-colors.css)
 % end
 % content_for 'ready_function' => begin
-    loadEmbeddedLogFiles();
+    filterEmbeddedLogFiles();
 % end
 
 % my $url = url_for('test_file', testid => $testid, filename => $filename);
 <div class="corner-buttons" style="margin-top: -5px;">
+<span id="filter-info"></span>
+<input id="filter-log-file" placeholder="substring or /regex/i" type="search">
     <a class="btn btn-light" href=".#downloads">
         <i class="fa fa-chevron-left"></i> Back to job <%= $testid %>
     </a>