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
|
// Copyright 2020 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.persistence;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.ClusterSpec;
import com.yahoo.config.provision.HostName;
import com.yahoo.config.provision.zone.ZoneId;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.controller.application.EndpointId;
import com.yahoo.vespa.hosted.controller.routing.GlobalRouting;
import com.yahoo.vespa.hosted.controller.routing.RoutingPolicy;
import com.yahoo.vespa.hosted.controller.routing.RoutingPolicyId;
import com.yahoo.vespa.hosted.controller.routing.Status;
import java.time.Instant;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
/**
* Serializer and deserializer for a {@link RoutingPolicy}.
*
* @author mortent
* @author mpolden
*/
public class RoutingPolicySerializer {
// WARNING: Since there are multiple servers in a ZooKeeper cluster and they upgrade one by one
// (and rewrite all nodes on startup), changes to the serialized format must be made
// such that what is serialized on version N+1 can be read by version N:
// - ADDING FIELDS: Always ok
// - REMOVING FIELDS: Stop reading the field first. Stop writing it on a later version.
// - CHANGING THE FORMAT OF A FIELD: Don't do it bro.
private static final String routingPoliciesField = "routingPolicies";
private static final String clusterField = "cluster";
private static final String canonicalNameField = "canonicalName";
private static final String zoneField = "zone";
private static final String dnsZoneField = "dnsZone";
private static final String rotationsField = "rotations";
private static final String loadBalancerActiveField = "active";
private static final String globalRoutingField = "globalRouting";
private static final String agentField = "agent";
private static final String changedAtField = "changedAt";
private static final String statusField = "status";
public Slime toSlime(Map<RoutingPolicyId, RoutingPolicy> routingPolicies) {
var slime = new Slime();
var root = slime.setObject();
var policyArray = root.setArray(routingPoliciesField);
routingPolicies.values().forEach(policy -> {
var policyObject = policyArray.addObject();
policyObject.setString(clusterField, policy.id().cluster().value());
policyObject.setString(zoneField, policy.id().zone().value());
policyObject.setString(canonicalNameField, policy.canonicalName().value());
policy.dnsZone().ifPresent(dnsZone -> policyObject.setString(dnsZoneField, dnsZone));
var rotationArray = policyObject.setArray(rotationsField);
policy.endpoints().forEach(endpointId -> {
rotationArray.addString(endpointId.id());
});
policyObject.setBool(loadBalancerActiveField, policy.status().isActive());
globalRoutingToSlime(policy.status().globalRouting(), policyObject.setObject(globalRoutingField));
});
return slime;
}
public Map<RoutingPolicyId, RoutingPolicy> fromSlime(ApplicationId owner, Slime slime) {
var policies = new LinkedHashMap<RoutingPolicyId, RoutingPolicy>();
var root = slime.get();
var field = root.field(routingPoliciesField);
field.traverse((ArrayTraverser) (i, inspect) -> {
var endpointIds = new LinkedHashSet<EndpointId>();
inspect.field(rotationsField).traverse((ArrayTraverser) (j, endpointId) -> endpointIds.add(EndpointId.of(endpointId.asString())));
var id = new RoutingPolicyId(owner,
ClusterSpec.Id.from(inspect.field(clusterField).asString()),
ZoneId.from(inspect.field(zoneField).asString()));
policies.put(id, new RoutingPolicy(id,
HostName.from(inspect.field(canonicalNameField).asString()),
Serializers.optionalString(inspect.field(dnsZoneField)),
endpointIds,
new Status(inspect.field(loadBalancerActiveField).asBool(),
globalRoutingFromSlime(inspect.field(globalRoutingField)))));
});
return Collections.unmodifiableMap(policies);
}
public void globalRoutingToSlime(GlobalRouting globalRouting, Cursor object) {
object.setString(statusField, globalRouting.status().name());
object.setString(agentField, globalRouting.agent().name());
object.setLong(changedAtField, globalRouting.changedAt().toEpochMilli());
}
public GlobalRouting globalRoutingFromSlime(Inspector object) {
if (!object.valid()) return GlobalRouting.DEFAULT_STATUS;
var status = GlobalRouting.Status.valueOf(object.field(statusField).asString());
var agent = GlobalRouting.Agent.valueOf(object.field(agentField).asString());
var changedAt = Serializers.optionalInstant(object.field(changedAtField)).orElse(Instant.EPOCH);
return new GlobalRouting(status, agent, changedAt);
}
}
|
