SERVER-28120 persist config.collections entries on shards for the collections that the shards possess

1 files changed, 160 insertions, 0 deletions

diff --git a/src/mongo/s/catalog/type_shard_collection.cpp b/src/mongo/s/catalog/type_shard_collection.cpp
new file mode 100644
index 00000000000..e1c2a067be6
--- /dev/null
+++ b/src/mongo/s/catalog/type_shard_collection.cpp
@@ -0,0 +1,160 @@
+/**
+ *    Copyright (C) 2017 10gen Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    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/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects
+ *    for all of the code used other than as permitted herein. If you modify
+ *    file(s) with this exception, you may extend this exception to your
+ *    version of the file(s), but you are not obligated to do so. If you do not
+ *    wish to do so, delete this exception statement from your version. If you
+ *    delete this exception statement from all source files in the program,
+ *    then also delete it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/s/catalog/type_shard_collection.h"
+
+#include "mongo/base/status_with.h"
+#include "mongo/bson/bsonobj.h"
+#include "mongo/bson/bsonobjbuilder.h"
+#include "mongo/bson/util/bson_extract.h"
+#include "mongo/s/catalog/type_collection.h"
+#include "mongo/util/assert_util.h"
+
+namespace mongo {
+
+const std::string ShardCollectionType::ConfigNS = "config.collections";
+
+const BSONField<std::string> ShardCollectionType::uuid("_id");
+const BSONField<std::string> ShardCollectionType::ns("ns");
+const BSONField<BSONObj> ShardCollectionType::keyPattern("key");
+const BSONField<OID> ShardCollectionType::lastConsistentCollectionVersionEpoch(
+    "lastConsistentCollectionVersionEpoch");
+const BSONField<Date_t> ShardCollectionType::lastConsistentCollectionVersion(
+    "lastConsistentCollectionVersion");
+
+ShardCollectionType::ShardCollectionType(const CollectionType& collectionType)
+    : ShardCollectionType(
+          collectionType.getNs(), collectionType.getNs(), collectionType.getKeyPattern()) {}
+
+ShardCollectionType::ShardCollectionType(const NamespaceString& uuid,
+                                         const NamespaceString& ns,
+                                         const KeyPattern& keyPattern)
+    : _uuid(uuid), _ns(ns), _keyPattern(keyPattern.toBSON()) {}
+
+StatusWith<ShardCollectionType> ShardCollectionType::fromBSON(const BSONObj& source) {
+    NamespaceString uuidNss;
+    {
+        std::string uuidString;
+        Status status = bsonExtractStringField(source, uuid.name(), &uuidString);
+        if (!status.isOK()) {
+            return status;
+        }
+        uuidNss = NamespaceString{uuidString};
+    }
+
+    NamespaceString nsNss;
+    {
+        std::string nsString;
+        Status status = bsonExtractStringField(source, ns.name(), &nsString);
+        if (!status.isOK()) {
+            return status;
+        }
+        nsNss = NamespaceString{nsString};
+    }
+
+    BSONElement collKeyPattern;
+    Status status = bsonExtractTypedField(source, keyPattern.name(), Object, &collKeyPattern);
+    if (!status.isOK()) {
+        return status;
+    }
+    BSONObj obj = collKeyPattern.Obj();
+    if (obj.isEmpty()) {
+        return Status(ErrorCodes::ShardKeyNotFound,
+                      str::stream() << "Empty shard key. Failed to parse: " << source.toString());
+    }
+    KeyPattern pattern(obj.getOwned());
+
+    ShardCollectionType shardCollectionType(uuidNss, nsNss, pattern);
+
+    {
+        auto statusWithChunkVersion = ChunkVersion::parseFromBSONWithFieldForCommands(
+            source, lastConsistentCollectionVersion.name());
+        if (statusWithChunkVersion.isOK()) {
+            ChunkVersion collVersion = std::move(statusWithChunkVersion.getValue());
+            shardCollectionType.setLastConsistentCollectionVersion(std::move(collVersion));
+        } else if (statusWithChunkVersion == ErrorCodes::NoSuchKey) {
+            // May not be set yet, which is okay.
+        } else {
+            return statusWithChunkVersion.getStatus();
+        }
+    }
+
+    return shardCollectionType;
+}
+
+bool ShardCollectionType::isLastConsistentCollectionVersionSet() const {
+    return _lastConsistentCollectionVersion.is_initialized();
+}
+
+BSONObj ShardCollectionType::toBSON() const {
+    BSONObjBuilder builder;
+
+    builder.append(uuid.name(), _uuid.toString());
+    builder.append(ns.name(), _ns.toString());
+    builder.append(keyPattern.name(), _keyPattern.toBSON());
+
+    if (_lastConsistentCollectionVersion) {
+        _lastConsistentCollectionVersion->appendWithFieldForCommands(
+            &builder, lastConsistentCollectionVersion.name());
+    }
+
+    return builder.obj();
+}
+
+std::string ShardCollectionType::toString() const {
+    return toBSON().toString();
+}
+
+void ShardCollectionType::setUUID(const NamespaceString& uuid) {
+    invariant(uuid.isValid());
+    _uuid = uuid;
+}
+
+void ShardCollectionType::setNs(const NamespaceString& ns) {
+    invariant(ns.isValid());
+    _ns = ns;
+}
+
+void ShardCollectionType::setKeyPattern(const KeyPattern& keyPattern) {
+    invariant(!keyPattern.toBSON().isEmpty());
+    _keyPattern = keyPattern;
+}
+
+void ShardCollectionType::setLastConsistentCollectionVersion(
+    const ChunkVersion& lastConsistentCollectionVersion) {
+    _lastConsistentCollectionVersion = lastConsistentCollectionVersion;
+}
+
+const OID ShardCollectionType::getLastConsistentCollectionVersionEpoch() const {
+    invariant(_lastConsistentCollectionVersion);
+    return _lastConsistentCollectionVersion->epoch();
+}
+
+}  // namespace mongo