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R3704/hadoop-2.3.0-src/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.js
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explorer.js
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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() {
"use strict";
// The chunk size of tailing the files, i.e., how many bytes will be shown
// in the preview.
var TAIL_CHUNK_SIZE = 32768;
var helpers = {
'helper_to_permission': function(chunk, ctx, bodies, params) {
var p = ctx.current().permission;
var dir = ctx.current().type == 'DIRECTORY' ? 'd' : '-';
var symbols = [ '---', '--x', '-w-', '-wx', 'r--', 'r-x', 'rw-', 'rwx' ];
var sticky = p > 1000;
var res = "";
for (var i = 0; i < 3; ++i) {
res = symbols[(p % 10)] + res;
p = Math.floor(p / 10);
}
if (sticky) {
var otherExec = ((ctx.current().permission % 10) & 1) == 1;
res = res.substr(0, res.length - 1) + (otherExec ? 't' : 'T');
}
chunk.write(dir + res);
return chunk;
}
};
var base = dust.makeBase(helpers);
var current_directory = "";
function show_err_msg(msg) {
$('#alert-panel-body').html(msg);
$('#alert-panel').show();
}
function network_error_handler(url) {
return function (jqxhr, text, err) {
var msg = '<p>Failed to retreive data from ' + url + ', cause: ' + err + '</p>';
if (url.indexOf('/webhdfs/v1') === 0) {
msg += '<p>WebHDFS might be disabled. WebHDFS is required to browse the filesystem.</p>';
}
show_err_msg(msg);
};
}
function append_path(prefix, s) {
var l = prefix.length;
var p = l > 0 && prefix[l - 1] == '/' ? prefix.substring(0, l - 1) : prefix;
return p + '/' + s;
}
function get_response(data, type) {
return data[type] !== undefined ? data[type] : null;
}
function get_response_err_msg(data) {
var msg = data.RemoteException !== undefined ? data.RemoteException.message : "";
return msg;
}
function view_file_details(path, abs_path) {
function show_block_info(blocks) {
var menus = $('#file-info-blockinfo-list');
menus.empty();
menus.data("blocks", blocks);
menus.change(function() {
var d = $(this).data('blocks')[$(this).val()];
if (d === undefined) {
return;
}
dust.render('block-info', d, function(err, out) {
$('#file-info-blockinfo-body').html(out);
});
});
for (var i = 0; i < blocks.length; ++i) {
var item = $('<option value="' + i + '">Block ' + i + '</option>');
menus.append(item);
}
menus.change();
}
var url = '/webhdfs/v1' + abs_path + '?op=GET_BLOCK_LOCATIONS';
$.ajax({"url": url, "crossDomain": true}).done(function(data) {
var d = get_response(data, "LocatedBlocks");
if (d === null) {
show_err_msg(get_response_err_msg(data));
return;
}
$('#file-info-tail').hide();
$('#file-info-title').text("File information - " + path);
var download_url = '/webhdfs/v1' + abs_path + '/?op=OPEN';
$('#file-info-download').attr('href', download_url);
$('#file-info-preview').click(function() {
var offset = d.fileLength - TAIL_CHUNK_SIZE;
var url = offset > 0 ? download_url + '&offset=' + offset : download_url;
$.get(url, function(t) {
$('#file-info-preview-body').val(t);
$('#file-info-tail').show();
}, "text").error(network_error_handler(url));
});
if (d.fileLength > 0) {
show_block_info(d.locatedBlocks);
$('#file-info-blockinfo-panel').show();
} else {
$('#file-info-blockinfo-panel').hide();
}
$('#file-info').modal();
}).error(network_error_handler(url));
}
function browse_directory(dir) {
var url = '/webhdfs/v1' + dir + '?op=LISTSTATUS';
$.get(url, function(data) {
var d = get_response(data, "FileStatuses");
if (d === null) {
show_err_msg(get_response_err_msg(data));
return;
}
current_directory = dir;
$('#directory').val(dir);
dust.render('explorer', base.push(d), function(err, out) {
$('#panel').html(out);
$('.explorer-browse-links').click(function() {
var type = $(this).attr('inode-type');
var path = $(this).attr('inode-path');
var abs_path = append_path(current_directory, path);
if (type == 'DIRECTORY') {
browse_directory(abs_path);
} else {
view_file_details(path, abs_path);
}
});
});
}).error(network_error_handler(url));
}
function init() {
dust.loadSource(dust.compile($('#tmpl-explorer').html(), 'explorer'));
dust.loadSource(dust.compile($('#tmpl-block-info').html(), 'block-info'));
var b = function() { browse_directory($('#directory').val()); };
$('#btn-nav-directory').click(b);
browse_directory('/');
}
init();
})();
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