/
FilterConfigParser.java
155 lines (136 loc) · 5.74 KB
/
FilterConfigParser.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.causalclustering.load_balancing.plugins.server_policies;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import org.neo4j.causalclustering.load_balancing.filters.Filter;
import org.neo4j.causalclustering.load_balancing.filters.FilterChain;
import org.neo4j.causalclustering.load_balancing.filters.FirstValidRule;
import org.neo4j.causalclustering.load_balancing.filters.IdentityFilter;
import org.neo4j.causalclustering.load_balancing.filters.MinimumCountFilter;
import static java.lang.String.format;
class FilterConfigParser
{
private static Filter<ServerInfo> filterFor( String filterName, String[] args ) throws InvalidFilterSpecification
{
switch ( filterName )
{
case "tags":
if ( args.length < 1 )
{
throw new InvalidFilterSpecification( format( "Invalid number of arguments for filter '%s': %d", filterName, args.length ) );
}
for ( String tag : args )
{
if ( tag.matches( "\\W" ) )
{
throw new InvalidFilterSpecification( format( "Invalid tag for filter '%s': '%s'", filterName, tag ) );
}
}
return new AnyTagFilter( args );
case "min":
if ( args.length != 1 )
{
throw new InvalidFilterSpecification( format( "Invalid number of arguments for filter '%s': %d", filterName, args.length ) );
}
int minCount;
try
{
minCount = Integer.parseInt( args[0] );
}
catch ( NumberFormatException e )
{
throw new InvalidFilterSpecification( format( "Invalid argument for filter '%s': '%s'", filterName, args[0] ), e );
}
return new MinimumCountFilter<>( minCount );
case "all":
if ( args.length != 0 )
{
throw new InvalidFilterSpecification( format( "Invalid number of arguments for filter '%s': %d", filterName, args.length ) );
}
return IdentityFilter.as();
default:
throw new InvalidFilterSpecification( "Unknown filter: " + filterName );
}
}
static Filter<ServerInfo> parse( String filterConfig ) throws InvalidFilterSpecification
{
if ( filterConfig.length() == 0 )
{
throw new InvalidFilterSpecification( "Filter config is empty" );
}
List<FilterChain<ServerInfo>> rules = new ArrayList<>();
String[] ruleSpecs = filterConfig.split( ";" );
if ( ruleSpecs.length == 0 )
{
throw new InvalidFilterSpecification( "No rules specified" );
}
for ( String ruleSpec : ruleSpecs )
{
ruleSpec = ruleSpec.trim();
List<Filter<ServerInfo>> filterChain = new ArrayList<>();
String[] filterSpecs = ruleSpec.split( "->" );
for ( String filterSpec : filterSpecs )
{
filterSpec = filterSpec.trim();
String namePart;
String argsPart;
{
String[] nameAndArgs = filterSpec.split( "\\(", 0 );
if ( nameAndArgs.length != 2 )
{
throw new InvalidFilterSpecification( format( "Syntax error filter specification: '%s'", filterSpec ) );
}
namePart = nameAndArgs[0].trim();
argsPart = nameAndArgs[1].trim();
}
if ( !argsPart.endsWith( ")" ) )
{
throw new InvalidFilterSpecification( format( "No closing parenthesis: '%s'", filterSpec ) );
}
argsPart = argsPart.substring( 0, argsPart.length() - 1 );
String filterName = namePart.trim();
if ( !filterName.matches( "\\w+" ) )
{
throw new InvalidFilterSpecification( format( "Syntax error filter name: '%s'", filterName ) );
}
String[] nonEmptyArgs = Arrays.stream(
argsPart.split( "," ) )
.map( String::trim )
.filter( s -> !s.isEmpty() )
.collect( Collectors.toList() )
.toArray( new String[0] );
for ( String arg : nonEmptyArgs )
{
if ( !arg.matches( "\\w+" ) )
{
throw new InvalidFilterSpecification( format( "Syntax error argument: '%s'", arg ) );
}
}
Filter<ServerInfo> filter = filterFor( filterName, nonEmptyArgs );
filterChain.add( filter );
}
rules.add( new FilterChain<>( filterChain ) );
}
return new FirstValidRule<>( rules );
}
}