/// <summary>
/// Resolves a single component connection. If connections are configured to be
/// retrieved from Discovery service it finds a IDiscovery and resolves the connection there.
/// </summary>
/// <param name="correlationId">(optional) transaction id to trace execution through call chain.</param>
/// <returns>resolved connection parameters or null if nothing was found.</returns>
public async Task <ConnectionParams> ResolveAsync(string correlationId)
{
if (_connections.Count == 0)
{
return(null);
}
// Return connection that doesn't require discovery
foreach (var connection in _connections)
{
if (!connection.UseDiscovery)
{
return(connection);
}
}
// Return connection that require discovery
foreach (var connection in _connections)
{
if (connection.UseDiscovery)
{
var resolvedConnection = await ResolveInDiscoveryAsync(correlationId, connection);
if (resolvedConnection != null)
{
// Merge configured and new parameters
resolvedConnection = new ConnectionParams(ConfigParams.MergeConfigs(connection, resolvedConnection));
return(resolvedConnection);
}
}
}
return(null);
}
/// <summary>
/// Resolves all component connection. If connections are configured to be
/// retrieved from Discovery service it finds a IDiscovery and resolves the connection there.
/// </summary>
/// <param name="correlationId">(optional) transaction id to trace execution through call chain.</param>
/// <returns>a list of resolved connections.</returns>
public async Task <List <ConnectionParams> > ResolveAllAsync(string correlationId)
{
var resolved = new List <ConnectionParams>();
var toResolve = new List <ConnectionParams>();
// Sort connections
foreach (var connection in _connections)
{
if (connection.UseDiscovery)
{
toResolve.Add(connection);
}
else
{
resolved.Add(connection);
}
}
// Resolve addresses that require that
if (toResolve.Count <= 0)
{
return(resolved);
}
foreach (var connection in toResolve)
{
var resolvedConnections = await ResolveAllInDiscoveryAsync(correlationId, connection);
foreach (var resolvedConnection in resolvedConnections)
{
// Merge configured and new parameters
var localResolvedConnection = new ConnectionParams(ConfigParams.MergeConfigs(connection, resolvedConnection));
resolved.Add(localResolvedConnection);
}
}
return(resolved);
}
private string ComposeUri(List <ConnectionParams> connections, CredentialParams credential)
{
// If there is a uri then return it immediately
foreach (var connection in connections)
{
var fullUri = connection.GetAsNullableString("uri");//connection.Uri;
if (fullUri != null)
{
return(fullUri);
}
}
// Define hosts
var hosts = "";
foreach (var connection in connections)
{
var host = connection.Host;
var port = connection.Port;
if (hosts.Length > 0)
{
hosts += ",";
}
hosts += host + (port == 0 ? "" : ":" + port);
}
// Define database
var database = "";
foreach (var connection in connections)
{
database = connection.GetAsNullableString("database") ?? database;
}
if (database.Length > 0)
{
database = "/" + database;
}
// Define authentication part
var auth = "";
if (credential != null)
{
var username = credential.Username;
if (username != null)
{
var password = credential.Password;
if (password != null)
{
auth = username + ":" + password + "@";
}
else
{
auth = username + "@";
}
}
}
// Define additional parameters parameters
var options = ConfigParams.MergeConfigs(connections.ToArray()).Override(credential);
options.Remove("uri");
options.Remove("host");
options.Remove("port");
options.Remove("database");
options.Remove("username");
options.Remove("password");
var parameters = "";
var keys = options.Keys;
foreach (var key in keys)
{
if (parameters.Length > 0)
{
parameters += "&";
}
parameters += key;
var value = options.GetAsString(key);
if (value != null)
{
parameters += "=" + value;
}
}
if (parameters.Length > 0)
{
parameters = "?" + parameters;
}
// Compose uri
var uri = "mongodb://" + auth + hosts + database + parameters;
return(uri);
}
public static AzureStorageConnectionParams MergeConfigs(params ConfigParams[] configs)
{
var config = ConfigParams.MergeConfigs(configs);
return(new AzureStorageConnectionParams(config));
}