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/**
* Copyright 2013 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 the "License";
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
$(function () {
/**
* Polyfills
*/
(function(){
if (!String.prototype.endsWith) {
String.prototype.endsWith = function(search, this_len) {
if (this_len === undefined || this_len > this.length) {
this_len = this.length;
}
return this.substring(this_len - search.length, this_len) === search;
};
}
if (window.NodeList && !NodeList.prototype.forEach) {
NodeList.prototype.forEach = Array.prototype.forEach;
}
})();
/**
* Continuously update the server time view with the actual backend time.
*/
(function() {
var failures = 0;
var timerId = window.setInterval(function() {
$.ajax({
url: "logviewer/serverTime",
dataType: "json",
global : false,
error: function() {
if (++ failures > 10) {
// Bail after 10 successive error responses from the server.
window.clearInterval(timerId);
}
},
success: function(data) {
failures = 0;
$("#serverTime").text(data.time);
}
});
}, 1000);
})();
var KEY_ENTER = 13,
KEY_A = 65,
NEWLINE = /\r?\n/,
LINES_PER_MB = 14000, // approximate number of log viewer lines per MB log data.
PATTERN_SECTION_START = /\*(TRACE|DEBUG|INFO|WARN|ERROR)\*/,
PATTERN_REQUEST_START = /^(.* )\[(\d+)]( -> (GET|POST|PUT|HEAD|DELETE) .*)$/,
PATTERN_REQUEST_END = /^(.* )\[(\d+)]( <- \d+ .*)$/,
textDecoder = new TextDecoder("UTF-8"),
tailSocket,
tailDomNode = document.getElementById("tail"),
$logfile = $("#logfile"),
$amount = $("#amount"),
$followButton = $("#followButton"),
$downloadCurrentLogfile = $("#downloadCurrentLogfile"),
$downloadAllLogfiles = $("#downloadAllLogfiles"),
$grep = $("#grep");
/**
* Enable chosen-select on the logfile dropdown.
*/
$logfile.chosen({width : "16em"});
/**
* Enable download behaviors for the download buttons.
*/
$downloadCurrentLogfile.click(function() {
if ($logfile.val()) {
window.open("logviewer/download?file=" + $logfile.val());
}
return false;
});
$downloadAllLogfiles.click(function() {
window.open("logviewer/download");
return false;
});
/**
* Represents the Tail view and the related operations.
*/
var Tail = {
/**
* The known types of logfiles.
*/
LogType: Object.freeze({
ERROR_LOG: 0,
REQUEST_LOG: 1,
ACCESS_LOG: 2
}),
/**
* The regular expression to apply to all log entries (hide elements not matching)
*/
filterExpression : undefined,
/**
* The amount of entries in the tail view to keep.
*/
scrollBackBuffer : (parseFloat($amount.val()) || 0.1) * LINES_PER_MB,
/**
* The currently tailed log file type.
*/
logType: undefined,
/**
* The buffered remained of a line not yet terminated.
*/
buffer: "",
/**
* The currently open section (logically connected lines of a logfile, e.g. a stacktrace), if any.
*/
currentSection: undefined,
followMode: false,
/**
* Clears the log excerpt and re-sets any associated state.
*/
clear: function () {
tailDomNode.innerHTML = "";
this.buffer = "";
this.currentSection = undefined;
},
/**
* Send meta-info about the tail process itself to the tail, e.g. a notification
* when log file rotation occurs.
*/
info: function (text) {
tailDomNode.appendChild(document.createElement("br"));
tailDomNode.appendChild(
document.createTextNode(' ----------------- ' + text + ' ----------------- ')
);
tailDomNode.appendChild(document.createElement("br"));
tailDomNode.appendChild(document.createElement("br"));
this.followUp();
},
/**
* Add a message to the tail.
*/
add: function (text) {
function linkRequestLog(match, config) {
var link = document.createElement("a"),
div = document.createElement("div");
link.textContent = '[' + match[2] + ']';
config.attributes.forEach(function(attribute) {
link.setAttribute(attribute.name, attribute.value);
});
div.appendChild(document.createTextNode(match[1]));
div.appendChild(link);
div.appendChild(document.createTextNode(match[3]));
div.appendChild(document.createElement("br"));
return div;
}
var lines = (this.buffer + text).split(NEWLINE);
for (var i = 0; i < lines.length - 1; ++i) {
/**
* Convert each line of text into a new text DOM node. This non-normalized approach
* (many small text nodes instead of one large text node) has many advantages: It significantly increases performance
* as it allows the browser to only render the text nodes currently in view and allows to easily take single lines
* of text and highlight them, e.g. for highlighting errors.
*
* @type {Text}
*/
var textNode = document.createTextNode(lines[i]);
var textContentForPatternMatching = textNode.nodeValue;
// Enable section detection if we know we are in an error.log or the logfile type is not known.
if (this.logType === Tail.LogType.ERROR_LOG || this.logType === undefined) {
// An interrelated entry, e.g. an error stack trace, was detected before and is not yet finished
if (this.currentSection) {
var firstChar = textNode.nodeValue.charAt(0);
// The first character is a tab or not a number -> consider it part of a stack trace.
if (firstChar === '\t' || (firstChar * 0) !== 0) {
// Add the node to the existing section
this.currentSection.appendChild(textNode);
this.currentSection.appendChild(document.createElement("br"));
// The section might be hidden as it did not yet contain a match for the grep expression.
// Make it visible in case the grep expression matches after new data is added.
this.filterExpression &&
this.currentSection.style.display === "none" &&
this.filterExpression.test(this.currentSection.textContent) &&
(this.currentSection.style.display = "");
continue;
}
// The text is not part of the current section -> end the section
this.currentSection = undefined;
}
// A new interrelated section is detected.
var match = PATTERN_SECTION_START.exec(textContentForPatternMatching);
if (match !== null) {
this.logType = Tail.LogType.ERROR_LOG;
// Create a new div that will hold all elements of the logged entry, including stack traces
this.currentSection = document.createElement("div");
this.currentSection.className = match[1].toLowerCase();
// Add the current text to the newly created section
this.currentSection.appendChild(textNode);
this.currentSection.appendChild(document.createElement("br"));
// Add the newly created section to the log view
this.addToTail(this.currentSection);
continue;
}
}
if (this.logType === Tail.LogType.REQUEST_LOG || this.logType === undefined) {
var requestStartMatch = PATTERN_REQUEST_START.exec(textContentForPatternMatching);
if (requestStartMatch != null) {
this.logType = Tail.LogType.REQUEST_LOG;
var id = requestStartMatch[2];
var logLine = linkRequestLog(requestStartMatch, { attributes: [
{name : "href", value: '#res' + id},
{name : "name", value: 'req' + id}
]});
logLine.id = 'req' + id;
logLine.nebaRequestId = 'res' + id;
logLine.onmouseover = function () {
var responseLine = document.getElementById(this.nebaRequestId);
this.title = responseLine ? responseLine.textContent : "No response for this request found in the current log excerpt.";
};
this.addToTail(logLine);
continue;
}
var requestEndMatch = PATTERN_REQUEST_END.exec(textContentForPatternMatching);
if (requestEndMatch != null) {
this.logType = Tail.LogType.REQUEST_LOG;
var id = requestEndMatch[2];
var requestLine = document.getElementById('req' + id);
var logLine = linkRequestLog(requestEndMatch, { attributes: [
{name : "href", value: '#req' + id},
{name : "name", value: 'res' + id}
]});
logLine.id = 'res' + id;
logLine.title = requestLine ? requestLine.textContent : "No request for this response found in the current log excerpt.";
this.addToTail(logLine);
continue;
}
}
// Simply append the line
var div = document.createElement("div");
div.appendChild(textNode);
this.addToTail(div);
}
if (lines[lines.length - 1]) {
this.buffer = lines[lines.length - 1];
} else {
this.buffer = "";
}
this.followUp();
},
/**
* Adds a new node to the tail view. removes old nodes with regards to the
* scroll back buffer and calculates the nodes visibility based on the grep regex.
*/
addToTail: function(node) {
Tail.filterExpression && node.style && (node.style.display = Tail.filterExpression.test(node.textContent) ? "" : "none");
tailDomNode.appendChild(node);
// Limit number of entries to scrollback buffer
while (tailDomNode.childNodes.length > this.scrollBackBuffer) {
tailDomNode.childNodes.item(0).remove()
}
},
updateFilterExpressionFromUserInput : function() {
if ($grep.val() === "") {
Tail.filterExpression = undefined;
$grep.css("border", "1px solid transparent")
.attr("title", "");
Tail.showAllTailEntries();
return;
}
try {
Tail.filterExpression = new RegExp($grep.val());
Tail.applyFilterExpression();
$grep.css("border", "1px solid green")
.attr("title", "")
} catch (e) {
Tail.filterExpression = undefined;
$grep.css("border", "1px solid red")
.attr("title", "Invalid regular expression: " + e.message);
}
},
/**
* Applies a new or changed filter expression to all nodes
* of the tail view.
*/
applyFilterExpression: function() {
var expression = Tail.filterExpression;
expression && tailDomNode.childNodes.forEach(function(node) {
node.style && (node.style.display = expression.test(node.textContent) ? "" : "none");
});
},
showAllTailEntries : function() {
tailDomNode.childNodes.forEach(function(node) {
node.style && (node.style.display = "");
});
},
/**
* When follow mode is on, scroll to the bottom of the views.
*/
followUp: function () {
Tail.followMode &&
(tailDomNode.scrollTop = tailDomNode.scrollHeight);
},
/**
* Whether to follow the log file additions.
* @returns {boolean} whether follow mode is on.
*/
toggleFollowMode: function () {
Tail.followMode = !Tail.followMode;
if (Tail.followMode) {
Tail.clear();
followSelectedLogFile();
} else {
stopFollowing();
}
Tail.followUp();
return Tail.followMode;
},
updateScrollbackBufferSize: function() {
Tail.scrollBackBuffer = (parseFloat($amount.val()) || 0.1) * LINES_PER_MB;
}
};
adjustViewsToScreenHeight();
restrictCopyAllToLogView();
try {
tailSocket = createSocket();
tailSocket.onopen = function () {
initUiBehavior();
updateFromRequestParameters();
}
} catch (e) {
console && console.log(e);
Tail.info("Unable to open server connection: " + e.message)
}
/**
* Binds the log viewer behavior to the UI elements (such as buttons) once
* a websocket connection was successfully established.
*/
function initUiBehavior() {
$logfile.change(function () {
if ($logfile.val()) {
logfileParametersChanged();
}
return false;
});
$grep.keydown(function (event) {
return event.which !== KEY_ENTER;
});
$grep.keyup(function() {
// De-bounce handling: Do not apply the filter expression upon
// every character that is being typed, but a certain amount of time after
// the last key press
$grep.timer && window.clearTimeout($grep.timer);
$grep.timer = window.setTimeout(Tail.updateFilterExpressionFromUserInput, 300);
});
Tail.updateFilterExpressionFromUserInput();
$amount.change(Tail.updateScrollbackBufferSize);
$followButton.click(function () {
Tail.toggleFollowMode() ? activeStyle($followButton) : inactiveStyle($followButton);
return false;
});
$amount.keydown(function (event) {
if (event.which === KEY_ENTER) {
logfileParametersChanged();
return false;
}
return true;
});
}
function activeStyle($button) {
$button.css("background", "palegreen").css("font-weight", "bold")
}
function inactiveStyle($button) {
$button.css("background", "").css("font-weight", "")
}
/**
* Creates a new websocket and initializes message and error handling.
*
* @returns {WebSocket}
*/
function createSocket() {
var socket = new WebSocket((window.location.protocol === "https:" ? "wss" : "ws") + "://" + window.location.host + "/system/console/logviewer/tail");
socket.onclose = function () {
Tail.info("Connection to server lost. Trying to reconnect ...");
window.setTimeout(function () {
try {
tailSocket = createSocket();
tailSocket.onopen = function() {
Tail.clear();
tailSelectedLogFile();
};
} catch (e) {
console && console.log(e);
Tail.info("Unable to open server connection: " + e.message);
}
}, 2000);
};
socket.onmessage = function (event) {
var data = event.data;
if (data instanceof ArrayBuffer) {
Tail.add(textDecoder.decode(event.data));
} else if (typeof data === 'string') {
if ("pong" === data) {
return;
}
Tail.info(data);
} else if (console) {
console.error("Unsupported data format of websocket response " + data + ".")
}
};
socket.binaryType = "arraybuffer";
window.setInterval(function () {
socket.readyState === WebSocket.OPEN &&
socket.send("ping")
}, 1000);
window.onunload = function () {
if (socket) {
socket.onclose = undefined;
socket.close();
}
};
return socket;
}
/**
* Load selected logfile from the request parameters, e.g. ?file=/my/file&amount=100
*/
function updateFromRequestParameters() {
var queryString = document.location.search;
if (!queryString) {
return;
}
var opts = {};
var requestParameterPattern = /([?&])([^=]+)=([^&?]*)/g,
match;
while ((match = requestParameterPattern.exec(queryString)) !== null) {
opts[match[2]] = decodeURI(match[3]);
}
opts.amount && (parseFloat(opts.amount) > 0) && $amount.val(opts.amount) && Tail.updateScrollbackBufferSize();
if (opts.file) {
$logfile.children().each(function (_, v) {
if (v.value === opts.file) {
$logfile.val(opts.file);
$logfile.trigger("chosen:updated");
}
});
}
tailDomNode.innerHTML = "";
tailSelectedLogFile();
opts.grep && $grep.val(opts.grep) && Tail.updateFilterExpressionFromUserInput();
}
/**
* Re-loads the page with the selected parameters.
*/
function logfileParametersChanged() {
var file = $logfile.val(),
amount = parseFloat($amount.val()),
grep = $grep.val(),
href = document.location.href,
queryPos = Math.max(href.indexOf("?"), href.indexOf("#")),
endPos = queryPos === -1 ? href.length : queryPos;
if (!(file && amount)) {
return;
}
document.location.href = href.substr(0, endPos) + "?file=" + file + '&amount=' + amount + "&grep=" + (grep || "");
}
/**
* Starts tailing the selected log file.
*/
function tailSelectedLogFile() {
var file = $logfile.val(),
amount = $amount.val();
if (!(file && amount)) {
return;
}
tailSocket.send("tail:" + parseFloat(amount) + 'mb:' + file);
}
/**
* Starts following the selected log file.
*/
function followSelectedLogFile() {
var file = $logfile.val(),
amount = $amount.val();
if (!(file && amount)) {
return;
}
tailSocket.send("follow:" + parseFloat(amount) + 'mb:' + file);
}
/**
* Stops following any logfile.
*/
function stopFollowing() {
tailSocket.send("stop");
}
function adjustViewsToScreenHeight() {
tailDomNode.style.height = (screen.height * 0.65) + "px";
}
/**
* Intercepts ctrl + a to create a text selection exclusively spanning the current
* log data view.
*/
function restrictCopyAllToLogView() {
$(document).keydown(function (e) {
if (e.keyCode === KEY_A && e.ctrlKey) {
e.preventDefault();
var range = document.createRange();
range.selectNode(tailDomNode);
var selection = window.getSelection();
selection.removeAllRanges();
selection.addRange(range);
}
});
}
});
