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Posted to commits@aurora.apache.org by wf...@apache.org on 2013/12/31 22:19:59 UTC
[06/51] [partial] Rename twitter* and com.twitter to apache and
org.apache directories to preserve all file history before the refactor.
http://git-wip-us.apache.org/repos/asf/incubator-aurora/blob/bc1635df/src/main/python/twitter/thermos/observer/http/assets/jquery.pailer.js
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diff --git a/src/main/python/twitter/thermos/observer/http/assets/jquery.pailer.js b/src/main/python/twitter/thermos/observer/http/assets/jquery.pailer.js
deleted file mode 100644
index 5962f9e..0000000
--- a/src/main/python/twitter/thermos/observer/http/assets/jquery.pailer.js
+++ /dev/null
@@ -1,317 +0,0 @@
-// A jQuery plugin for PAging and taILing data (i.e., a
-// 'PAILer'). Paging occurs when scrolling reaches the "top" and
-// tailing occurs when scrolling has reached the "bottom".
-
-// A 'read' function must be provided for reading the data (in
-// bytes). This function should expect an "options" object with the
-// fields 'offset' and 'length' set for reading the data. The result
-// from of the function should be a "promise" like value which has a
-// 'success' and 'error' callback which each take a function. An
-// object with at least two fields defined ('offset' and 'length') is
-// expected on success. A third field, 'data' may be provided if
-// 'length' is greater than 0. If the offset requested is greater than
-// the available offset, the result should be an object with the
-// 'offset' field set to the available offset (i.e., the length of the
-// data) and the 'length' field set to 0.
-
-// The plugin prepends, appends, and updates the "html" component of
-// the elements specified in the jQuery selector (e.g., doing
-// $('#data').pailer(...) means that data will be updated within
-// $('#data') via $('#data').prepend(...) and $('#data').append(...)
-// and $('#data').html(...) calls).
-
-// An indicator paragraph element (i.e., <p>) can be specified that
-// the plugin will write text to describing any status/errors that
-// have been encountered.
-
-// Data will automagically get truncated at some specified length,
-// configurable via the 'truncate-length' option. Likewise, the amount
-// of data paged in at a time can be configured via the 'page-size'
-// option.
-
-// Example:
-// HTML:
-// <div id="data" style="white-space:pre-wrap;"></div>
-//
-// <div style="position: absolute; left: 5px; top: 0px;">
-// <p id="indicator"></p>
-// </div>
-// Javascript:
-// $('#data').pailer({
-// 'read': function(options) {
-// var settings = $.extend({
-// 'offset': -1,
-// 'length': -1
-// }, options);
-// var url = '/url/for/data'
-// + '?offset=' + settings.offset
-// + '&length=' + settings.length;
-// return $.getJSON(url);
-// },
-// 'indicator': $('#indicator')
-// });
-
-(function($) {
- function Pailer(read, element, indicator, page_size, truncate_length) {
- var this_ = this;
-
- this_.read = read;
- this_.element = element;
- this_.indicator = indicator;
- this_.initialized = false;
- this_.start = -1;
- this_.end = -1;
- this_.paging = false;
- this_.tailing = true;
-
- page_size || $.error('Expecting page_size to be defined');
- truncate_length || $.error('Expecting truncate_length to be defined');
-
- this_.page_size = page_size;
- this_.truncate_length = truncate_length;
-
- this_.element.css('overflow', 'auto');
-
- this_.element.scroll(function () {
- var scrollTop = this_.element.scrollTop();
- var height = this_.element.height();
- var scrollHeight = this_.element[0].scrollHeight;
-
- if (scrollTop == 0) {
- this_.page();
- } else if (scrollTop + height >= scrollHeight) {
- if (!this_.tailing) {
- this_.tailing = true;
- this_.tail();
- }
- } else {
- this_.tailing = false;
- }
- });
- }
-
-
- Pailer.prototype.initialize = function() {
- var this_ = this;
-
- // Set an indicator while we load the data.
- this_.indicate('(LOADING)');
-
- this_.read({'offset': -1})
- .success(function(data) {
- this_.indicate('');
-
- // Get the last page of data.
- if (data.offset > this_.page_size) {
- this_.start = this_.end = data.offset - this_.page_size;
- } else {
- this_.start = this_.end = 0;
- }
-
- this_.initialized = true;
- this_.element.html('');
- setTimeout(function() { this_.tail(); }, 0);
- })
- .error(function() {
- this_.indicate('(FAILED TO INITIALIZE ... RETRYING)');
- setTimeout(function() {
- this_.indicate('');
- this_.initialize();
- }, 1000);
- });
- }
-
-
- Pailer.prototype.page = function() {
- var this_ = this;
-
- if (!this_.initialized) {
- return;
- }
-
- if (this_.paging) {
- return;
- }
-
- this_.paging = true;
- this_.indicate('(PAGING)');
-
- if (this_.start == 0) {
- this_.paging = false;
- this_.indicate('(AT BEGINNING OF FILE)');
- setTimeout(function() { this_.indicate(''); }, 1000);
- return;
- }
-
- var offset = this_.start - this_.page_size;
- var length = this_.page_size;
-
- if (offset < 0) {
- offset = 0;
- length = this_.start;
- }
-
- // Buffer the data in case what gets read is less than 'length'.
- var buffer = '';
-
- var read = function(offset, length) {
- this_.read({'offset': offset, 'length': length})
- .success(function(data) {
- if (data.length < length) {
- buffer += data.data;
- read(offset + data.length, length - data.length);
- } else if (data.length > 0) {
- this_.indicate('(PAGED)');
- setTimeout(function() { this_.indicate(''); }, 1000);
-
- // Prepend buffer onto data.
- data.offset -= buffer.length;
- data.data = buffer + data.data;
- data.length = data.data.length;
-
- // Truncate to the first newline (unless this is the beginning).
- if (data.offset != 0) {
- var index = data.data.indexOf('\n') + 1;
- data.offset += index;
- data.data = data.data.substring(index);
- data.length -= index;
- }
-
- this_.start = data.offset;
-
- var scrollTop = this_.element.scrollTop();
- var scrollHeight = this_.element[0].scrollHeight;
-
- this_.element.prepend(data.data);
-
- scrollTop += this_.element[0].scrollHeight - scrollHeight;
- this_.element.scrollTop(scrollTop);
-
- this_.paging = false;
- }
- })
- .error(function() {
- this_.indicate('(FAILED TO PAGE ... RETRYING)');
- setTimeout(function() {
- this_.indicate('');
- this_.page();
- }, 1000);
- });
- }
-
- read(offset, length);
- }
-
-
- Pailer.prototype.tail = function() {
- var this_ = this;
-
- if (!this_.initialized) {
- return;
- }
-
- this_.read({'offset': this_.end, 'length': this_.truncate_length})
- .success(function(data) {
- var scrollTop = this_.element.scrollTop();
- var height = this_.element.height();
- var scrollHeight = this_.element[0].scrollHeight;
-
- // Check if we are still at the bottom (since this event might
- // have fired before the scroll event has been dispatched).
- if (scrollTop + height < scrollHeight) {
- this_.tailing = false;
- return;
- }
-
- if (data.length > 0) {
- // Truncate to the first newline if this is the first time
- // (and we aren't reading from the beginning of the log).
- if (this_.start == this_.end && data.offset != 0) {
- var index = data.data.indexOf('\n') + 1;
- data.offset += index;
- data.data = data.data.substring(index);
- data.length -= index;
- this_.start = data.offset; // Adjust the actual start too!
- }
-
- this_.end = data.offset + data.length;
-
- this_.element.append(data.data);
-
- scrollTop += this_.element[0].scrollHeight - scrollHeight;
- this_.element.scrollTop(scrollTop);
-
- // Also, only if we're at the bottom, truncate data so that we
- // don't consume too much memory. TODO(benh): Only do
- // truncations if we've been at the bottom for a while.
- this_.truncate();
- }
-
- // Tail immediately if we got as much data as requested (since
- // this probably means we've waited around a while). The
- // alternative here would be to not get data in chunks, but the
- // potential issue here is that we might end up requesting GB of
- // log data at a time ... the right solution here might be to do
- // a request to determine the new ending offset and then request
- // the proper length.
- if (data.length == this_.truncate_length) {
- setTimeout(function() { this_.tail(); }, 0);
- } else {
- setTimeout(function() { this_.tail(); }, 1000);
- }
- })
- .error(function() {
- this_.indicate('(FAILED TO TAIL ... RETRYING)');
- this_.initialized = false;
- setTimeout(function() {
- this_.indicate('');
- this_.initialize();
- }, 1000);
- });
- }
-
-
- Pailer.prototype.indicate = function(text) {
- var this_ = this;
-
- if (this_.indicator) {
- this_.indicator.text(text);
- }
- }
-
-
- Pailer.prototype.truncate = function() {
- var this_ = this;
-
- var length = this_.element.html().length;
- if (length >= this_.truncate_length) {
- var index = length - this_.truncate_length;
- this_.start = this_.end - this_.truncate_length;
- this_.element.html(this_.element.html().substring(index));
- }
- }
-
- $.fn.pailer = function(options) {
- var settings = $.extend({
- 'read': function() { return {
- 'success': function() {},
- 'error': function(f) { f(); }
- }},
- 'page_size': 8 * 4096, // 8 "pages".
- 'truncate_length': 50000
- }, options);
-
- this.each(function() {
- var pailer = $.data(this, 'pailer');
- if (!pailer) {
- pailer = new Pailer(settings.read,
- $(this),
- settings.indicator,
- settings.page_size,
- settings.truncate_length);
- $.data(this, 'pailer', pailer);
- pailer.initialize();
- }
- });
- }
-})(jQuery);