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Add sharded DNS publishing capability

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This enables sharded DNS publishing on a per-TLD basis. Instead of a TLD-wide lock, the sharded scheme locks each update on the shard number, allowing parallel writes to DNS.

We allow N (the number of shards) to be 0 or 1 for no sharding, and N > 1 for an N-way sharding scheme. Unless explicitly set, all TLDs default to a numShards of 0, so we don't have to reload all registry objects explicitly.

WARNING: This will change the lock name upon deployment for the PublishDnsAction from "<TLD> Dns Updates" to "<TLD> Dns Updates shard 0". This may cause concurrency issues if the underlying DNSWriter is not parallel-write tolerant (currently all production usages are ZonemanWriter, which is parallel-tolerant, so no issues are expected).

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=187525655
This commit is contained in:
larryruili 2018-03-01 13:33:46 -08:00 • committed by jianglai
parent 24799b394d
commit fa989e754b
16 changed files with 474 additions and 64 deletions
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31
java/google/registry/util/DomainNameUtils.java
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@ -18,7 +18,9 @@ import static com.google.common.base.Preconditions.checkArgument;
import static google.registry.util.PreconditionsUtils.checkArgumentNotNull;
import com.google.common.base.Ascii;
import com.google.common.base.Joiner;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import com.google.common.net.InternetDomainName;
/** Utility methods related to domain names. */
@ -78,5 +80,34 @@ public final class DomainNameUtils {
return domainName.parent().toString();
}
/**
* Returns the second level domain name for a fully qualified host name under a given tld.
*
* <p>This function is merely a string parsing utility, and does not verify if the tld is operated
* by the registry.
*
* @throws IllegalArgumentException if either argument is null or empty, or the domain name is not
* under the tld
*/
public static String getSecondLevelDomain(String hostName, String tld) {
checkArgument(
!Strings.isNullOrEmpty(hostName),
"hostName cannot be null or empty");
checkArgument(!Strings.isNullOrEmpty(tld), "tld cannot be null or empty");
ImmutableList<String> domainParts = InternetDomainName.from(hostName).parts();
ImmutableList<String> tldParts = InternetDomainName.from(tld).parts();
checkArgument(
domainParts.size() > tldParts.size(),
"hostName must be at least one level below the tld");
checkArgument(
domainParts
.subList(domainParts.size() - tldParts.size(), domainParts.size())
.equals(tldParts),
"hostName must be under the tld");
ImmutableList<String> sldParts =
domainParts.subList(domainParts.size() - tldParts.size() - 1, domainParts.size());
return Joiner.on(".").join(sldParts);
}
private DomainNameUtils() {}
}