public async Task<BatchSet> GetChanges(string bucketName, Filter query, int limit, string anchor, string uploadAnchor)
{
var db = client.GetDatabase("local");
var collection = db.GetCollection<BsonDocument>("oplog.rs");
var filterBuilder = Builders<BsonDocument>.Filter;
FilterDefinition<BsonDocument> filter = filterBuilder.Eq("ns", DbName + "." + bucketName);
if (anchor != null)
{
filter = filter & filterBuilder.Gt("ts", new BsonTimestamp(Convert.ToInt64(anchor)));
}
var docs = await collection.Find(filter).Limit(limit).ToListAsync();
BatchSet bs = new BatchSet();
SyncLogItem logItem = null;
if (docs != null && docs.Count > 0 && !string.IsNullOrEmpty(uploadAnchor))
{
logItem = await GetSyncLogItem(uploadAnchor);
}
int i = 0;
foreach (var doc in docs)
{
if (i == docs.Count - 1)
{
bs.Anchor = doc["ts"].AsBsonTimestamp.ToString();
}
i++;
if (doc["op"] == "i" || doc["op"] == "u")
{
this.AddChangedDoc(bs, doc, logItem, query);
}
else if (doc["op"] == "d")
{
this.AddDeletedDoc(bs, doc, logItem);
}
}
return bs;
}
private bool OutOfFilter(Filter query, BsonDocument nestedDoc)
{
if (query == null)
return false;
string tagName = query.TagName;
if (query.TagName == "key")
{
tagName = "_id";
}
if (!nestedDoc.Names.Contains(tagName))
{
return true;
}
IComparable docValue = (IComparable)BsonTypeMapper.MapToDotNetValue(nestedDoc[tagName]);
if (query.Value != null && docValue.CompareTo((IComparable)query.Value) != 0)
{
return true;
}
if (query.Start != null && docValue.CompareTo((IComparable)query.Start) < 0)
return true;
if (query.End != null && docValue.CompareTo((IComparable)query.End) > 0)
return true;
return false;
}
private void AddChangedDoc(BatchSet bs, BsonDocument doc, SyncLogItem logItem, Filter query)
{
if (bs.ChangedDocuments == null)
bs.ChangedDocuments = new List<SiaqodbDocument>();
var nestedDoc = doc["o"].AsBsonDocument;
if (logItem != null && logItem.KeyVersion != null && logItem.KeyVersion.ContainsKey(nestedDoc["_id"].AsString) && logItem.KeyVersion[nestedDoc["_id"].AsString] == nestedDoc["_rev"].AsString)
return;
if (OutOfFilter(query, nestedDoc))
return;
SiaqodbDocument siaqodbDoc = Mapper.ToSiaqodbDocument(nestedDoc);
bs.ChangedDocuments.Add(siaqodbDoc);
}
private bool OutOfFilter(Filter query, CouchDBDocument co)
{
if (query == null)
return false;
string tagName = query.TagName;
if (query.TagName == "key")
{
tagName = "_id";
}
else if (!co.tags.Keys.Contains(tagName))
{
return true;
}
IComparable docValue = null;
if (query.TagName == "key")
{
docValue = co._id;
}
else
{
docValue = co.tags[tagName] as IComparable;
}
if (query.Value != null && docValue.CompareTo((IComparable)query.Value) != 0)
{
return true;
}
if (query.Start != null && docValue.CompareTo((IComparable)query.Start) < 0)
return true;
if (query.End != null && docValue.CompareTo((IComparable)query.End) > 0)
return true;
return false;
}
private void AddChangedDoc(BatchSet changeSet, ChangesResponse<string>.Row row, SyncLogItem logItem, Filter query, MyCouch.Serialization.ISerializer serializer)
{
if (changeSet.ChangedDocuments == null)
changeSet.ChangedDocuments = new List<SiaqodbDocument>();
CouchDBDocument co = serializer.Deserialize<CouchDBDocument>(row.IncludedDoc);
if (co._id.StartsWith("_design/"))
return;
//check uploaded anchor- means cliet just uploaded this record and we should not return back
if (logItem != null && logItem.KeyVersion != null && logItem.KeyVersion.ContainsKey(co._id) && logItem.KeyVersion[co._id] == co._rev)
return;
if (OutOfFilter(query, co))
return;
changeSet.ChangedDocuments.Add(Mapper.ToSiaqodbDocument(co));
}
public async Task<BatchSet> GetChanges(string bucketName, Filter query, int limit, string anchor,string uploadAnchor)
{
using (var client = new MyCouchClient(DbServerUrl, bucketName))
{
GetChangesRequest changesReq = new GetChangesRequest();
changesReq.Since = anchor;
changesReq.Limit = limit;
changesReq.IncludeDocs = true;
var response = await client.Changes.GetAsync(changesReq);
if (response.IsSuccess)
{
BatchSet changeSet = new BatchSet();
if (response.Results != null)
{
SyncLogItem logItem = await this.GetSyncLogItem(uploadAnchor);
foreach (var row in response.Results)
{
if (row.Deleted)
{
this.AddDeletedDoc(changeSet, row, logItem);
}
else
{
this.AddChangedDoc(changeSet, row, logItem, query,client.Serializer );
}
}
changeSet.Anchor = response.LastSeq;
}
return changeSet;
}
else CheckBucketNotFound(bucketName, response);
return null;
}
}
