private async Task StoreConfigRecordAsync(
IDocumentClient client,
DocumentDbConfig dbConfig,
ServiceConfigRecord newRecord,
Document existingDocument)
{
var collectionUri = GetDocumentCollectionUri(dbConfig);
if (existingDocument == null)
{
// No record exists yet. Use the creation method to ensure failure if another process has modified the
// record that a failure is produced.
await client.CreateDocumentAsync(collectionUri, newRecord);
}
else
{
// Add IfMatch header to ensure the record has not been changed by another process.
RequestOptions options = new RequestOptions
{
AccessCondition = new AccessCondition
{
Condition = existingDocument.ETag,
Type = AccessConditionType.IfMatch
}
};
await client.UpsertDocumentAsync(collectionUri, newRecord, options);
}
}
private async Task EnsureServiceConfigAsync(
IDocumentClient client,
DocumentDbConfig dbConfig,
string configSignature,
List <DocumentStoreConfig> configs)
{
var existingDocument = await GetConfigRecordAsync(client, dbConfig);
if (existingDocument != null)
{
// Config already exists.
ServiceConfigRecord existingConfigRecord = (dynamic)existingDocument;
if (existingConfigRecord.Signature == configSignature)
{
// No changes to the config. Nothing to do.
return;
}
// Config has been updated. Perform an update.
await UpdateCollectionConfigAsync(client, dbConfig, configs);
}
// There has been a config change. Update the config record.
var configRecordId = GetConfigRecordId();
var configRecord = new ServiceConfigRecord
{
Id = configRecordId,
Signature = configSignature,
PartitionKey = configRecordId
};
// Update the store config record.
await StoreConfigRecordAsync(client, dbConfig, configRecord, existingDocument);
}
