private static void DeleteAllEntriesFromSampleTable(TableStorageDataServiceContext svc, string tableName)
{
IEnumerable <SampleEntity> res;
TableStorageDataServiceQuery <SampleEntity> q;
Console.WriteLine("Deleting all entities from the table...");
Console.WriteLine("This can take a while...");
var qResult = from c in svc.CreateQuery <SampleEntity>(tableName)
select c;
q = new TableStorageDataServiceQuery <SampleEntity>(qResult as DataServiceQuery <SampleEntity>);
res = q.ExecuteAllWithRetries();
int i = 0;
foreach (SampleEntity s in res)
{
svc.DeleteObject(s);
svc.SaveChangesWithRetries();
if (++i % 50 == 0)
{
Console.WriteLine("Deleted element " + i);
}
}
}
public override bool IsUserInRole(string username, string roleName)
{
SecUtility.CheckParameter(ref roleName, true, true, true, MaxTableRoleNameLength, "rolename");
SecUtility.CheckParameter(ref username, true, false, true, Constants.MaxTableUsernameLength, "username");
if (username.Length < 1)
{
return(false);
}
try
{
TableStorageDataServiceContext svc = CreateDataServiceContext();
DataServiceQuery <RoleRow> queryObj = svc.CreateQuery <RoleRow>(_tableName);
IEnumerable <RoleRow> query = from user in queryObj
where (user.PartitionKey == SecUtility.CombineToKey(_applicationName, username) ||
user.PartitionKey == SecUtility.CombineToKey(_applicationName, string.Empty)) &&
user.RowKey == SecUtility.Escape(roleName)
select user;
TableStorageDataServiceQuery <RoleRow> q = new TableStorageDataServiceQuery <RoleRow>(query as DataServiceQuery <RoleRow>, _tableRetry);
IEnumerable <RoleRow> userRows = q.ExecuteWithRetries();
if (userRows == null)
{
throw new ProviderException(string.Format(CultureInfo.InstalledUICulture, "The role {0} does not exist.", roleName));
}
List <RoleRow> l = new List <RoleRow>(userRows);
if (l.Count == 0)
{
throw new ProviderException(string.Format(CultureInfo.InstalledUICulture, "The role {0} does not exist.", roleName));
}
RoleRow row;
if (IsStaleRole(l, out row))
{
throw new ProviderException(string.Format(CultureInfo.InstalledUICulture, "The role {0} does not exist.", roleName));
}
if (l.Count > 2)
{
throw new ProviderException("User name appears twice in the same role!");
}
if (l.Count == 1)
{
Debug.Assert(string.IsNullOrEmpty(l.ElementAt(0).UserName));
return(false);
}
return(true);
}
catch (InvalidOperationException e)
{
throw new ProviderException("Error while accessing the data store.", e);
}
}
public override string[] GetRolesForUser(string username)
{
SecUtility.CheckParameter(ref username, true, false, true, Constants.MaxTableUsernameLength, "username");
if (username.Length < 1)
{
return(new string[0]);
}
try
{
TableStorageDataServiceContext svc = CreateDataServiceContext();
DataServiceQuery <RoleRow> queryObj = svc.CreateQuery <RoleRow>(_tableName);
IEnumerable <RoleRow> query = from user in queryObj
where user.PartitionKey == SecUtility.CombineToKey(_applicationName, username) ||
user.PartitionKey == SecUtility.CombineToKey(_applicationName, string.Empty)
select user;
TableStorageDataServiceQuery <RoleRow> q = new TableStorageDataServiceQuery <RoleRow>(query as DataServiceQuery <RoleRow>, _tableRetry);
IEnumerable <RoleRow> userRows = q.ExecuteAllWithRetries();
if (userRows == null)
{
return(new string[0]);
}
List <RoleRow> l = new List <RoleRow>(userRows);
if (l.Count == 0)
{
return(new string[0]);
}
List <string> ret = new List <string>();
foreach (RoleRow user in l)
{
if (!string.IsNullOrEmpty(user.UserName) && !IsStaleRole(l, user.RoleName))
{
ret.Add(user.RoleName);
}
}
return(ret.ToArray());
}
catch (InvalidOperationException e)
{
throw new ProviderException("Error while accessing the data store.", e);
}
}
public override string[] GetUsersInRole(string roleName)
{
SecUtility.CheckParameter(ref roleName, true, true, true, MaxTableRoleNameLength, "rolename");
try
{
TableStorageDataServiceContext svc = CreateDataServiceContext();
DataServiceQuery <RoleRow> queryObj = svc.CreateQuery <RoleRow>(_tableName);
IEnumerable <RoleRow> query = from user in queryObj
where user.PartitionKey.CompareTo(SecUtility.EscapedFirst(_applicationName)) >= 0 &&
user.PartitionKey.CompareTo(SecUtility.NextComparisonString(SecUtility.EscapedFirst(_applicationName))) < 0 &&
user.RowKey == SecUtility.Escape(roleName)
select user;
TableStorageDataServiceQuery <RoleRow> q = new TableStorageDataServiceQuery <RoleRow>(query as DataServiceQuery <RoleRow>, _tableRetry);
IEnumerable <RoleRow> userRows = q.ExecuteAllWithRetries();
if (userRows == null)
{
// role does not exist; we are supposed to throw an exception here
throw new ProviderException(string.Format(CultureInfo.InstalledUICulture, "The role {0} does not exist!", roleName));
}
List <RoleRow> l = new List <RoleRow>(userRows);
if (l.Count == 0 || IsStaleRole(l, roleName))
{
throw new ProviderException(string.Format(CultureInfo.InstalledUICulture, "The role {0} does not exist!", roleName));
}
List <string> ret = new List <string>();
foreach (RoleRow user in l)
{
if (!string.IsNullOrEmpty(user.UserName))
{
ret.Add(user.UserName);
}
}
return(ret.ToArray());
}
catch (InvalidOperationException e)
{
throw new ProviderException("Error while accessing the data store.", e);
}
}
public override bool RoleExists(string roleName)
{
SecUtility.CheckParameter(ref roleName, true, true, true, MaxTableRoleNameLength, "rolename");
try
{
TableStorageDataServiceContext svc = CreateDataServiceContext();
DataServiceQuery <RoleRow> queryObj = svc.CreateQuery <RoleRow>(_tableName);
IEnumerable <RoleRow> query = from role in queryObj
where role.PartitionKey == SecUtility.CombineToKey(_applicationName, string.Empty) &&
role.RowKey == SecUtility.Escape(roleName)
select role;
TableStorageDataServiceQuery <RoleRow> q = new TableStorageDataServiceQuery <RoleRow>(query as DataServiceQuery <RoleRow>, _tableRetry);
try
{
// this query addresses exactly one result
// we thus should get an exception if there is no element
q.ExecuteWithRetries();
return(true);
}
catch (DataServiceQueryException e)
{
HttpStatusCode s;
if (TableStorageHelpers.EvaluateException(e, out s) && s == HttpStatusCode.NotFound)
{
return(false);
}
else
{
throw;
}
}
}
catch (InvalidOperationException e)
{
throw new ProviderException("Error while accessing the data store.", e);
}
}
// the username to match can be in a format that varies between providers
// for this implementation, a syntax similar to the one used in the SQL provider is applied
// "user%" will return all users in a role that start with the string "user"
// the % sign can only appear at the end of the usernameToMatch parameter
// because the current version of the table storage service does not support StartsWith in LINQ queries,
// calling this function can cause significant network trafic when '%' is used in the usernameToMach
// parameter
public override string[] FindUsersInRole(string roleName, string usernameToMatch)
{
SecUtility.CheckParameter(ref roleName, true, true, true, MaxTableRoleNameLength, "rolename");
SecUtility.CheckParameter(ref usernameToMatch, true, true, false, Constants.MaxTableUsernameLength, "usernameToMatch");
bool startswith = false;
if (usernameToMatch.Contains('%'))
{
if (usernameToMatch.IndexOf('%') != usernameToMatch.Length - 1)
{
throw new ArgumentException("The TableStorageRoleProvider only supports search strings that contain '%' as the last character!");
}
usernameToMatch = usernameToMatch.Substring(0, usernameToMatch.Length - 1);
startswith = true;
}
try
{
TableStorageDataServiceContext svc = CreateDataServiceContext();
DataServiceQuery <RoleRow> queryObj = svc.CreateQuery <RoleRow>(_tableName);
IEnumerable <RoleRow> query;
if (startswith && string.IsNullOrEmpty(usernameToMatch))
{
// get all users in the role
query = from userRole in queryObj
where userRole.PartitionKey.CompareTo(SecUtility.EscapedFirst(_applicationName)) >= 0 &&
userRole.PartitionKey.CompareTo(SecUtility.NextComparisonString(SecUtility.EscapedFirst(_applicationName))) < 0 &&
userRole.RowKey == SecUtility.Escape(roleName)
select userRole;
}
else if (startswith)
{
// get all users in the role that start with the specified string (we cannot restrict the query more because StartsWith is not supported)
// we cannot include the username to search for in the key, because the key might e escaped
query = from userRole in queryObj
where userRole.PartitionKey.CompareTo(SecUtility.EscapedFirst(_applicationName)) >= 0 &&
userRole.PartitionKey.CompareTo(SecUtility.NextComparisonString(SecUtility.EscapedFirst(_applicationName))) < 0 &&
userRole.RowKey == SecUtility.Escape(roleName) &&
(userRole.UserName.CompareTo(usernameToMatch) >= 0 || userRole.UserName == string.Empty)
select userRole;
}
else
{
// get a specific user
query = from userRole in queryObj
where (userRole.PartitionKey == SecUtility.CombineToKey(_applicationName, usernameToMatch) ||
userRole.PartitionKey == SecUtility.CombineToKey(_applicationName, string.Empty)) &&
userRole.RowKey == SecUtility.Escape(roleName)
select userRole;
}
TableStorageDataServiceQuery <RoleRow> q = new TableStorageDataServiceQuery <RoleRow>(query as DataServiceQuery <RoleRow>, _tableRetry);
IEnumerable <RoleRow> userRows = q.ExecuteAllWithRetries();
if (userRows == null)
{
throw new ProviderException("The role does not exist!");
}
List <RoleRow> l = new List <RoleRow>(userRows);
if (l.Count == 0)
{
// the role does not exist
throw new ProviderException("The role does not exist!");
}
RoleRow role;
if (IsStaleRole(l, out role))
{
throw new ProviderException("The role does not exist!");
}
List <string> ret = new List <string>();
foreach (RoleRow row in l)
{
if (row != role)
{
if (startswith && !string.IsNullOrEmpty(usernameToMatch) && !row.UserName.StartsWith(usernameToMatch, StringComparison.Ordinal))
{
continue;
}
ret.Add(row.UserName);
}
}
return(ret.ToArray());
}
catch (InvalidOperationException e)
{
throw new ProviderException("Error while accessing the data store.", e);
}
}
public override bool DeleteRole(string roleName, bool throwOnPopulatedRole)
{
SecUtility.CheckParameter(ref roleName, true, true, true, MaxTableRoleNameLength, "rolename");
try
{
TableStorageDataServiceContext svc = CreateDataServiceContext();
DataServiceQuery <RoleRow> queryObj = svc.CreateQuery <RoleRow>(_tableName);
IEnumerable <RoleRow> query = from userRole in queryObj
where userRole.PartitionKey.CompareTo(SecUtility.EscapedFirst(_applicationName)) >= 0 &&
userRole.PartitionKey.CompareTo(SecUtility.NextComparisonString(SecUtility.EscapedFirst(_applicationName))) < 0 &&
userRole.RowKey == SecUtility.Escape(roleName)
select userRole;
TableStorageDataServiceQuery <RoleRow> q = new TableStorageDataServiceQuery <RoleRow>(query as DataServiceQuery <RoleRow>, _tableRetry);
IEnumerable <RoleRow> userRows = q.ExecuteAllWithRetries();
if (userRows == null)
{
return(false);
}
List <RoleRow> l = new List <RoleRow>(userRows);
if (l.Count == 0)
{
// the role does not exist
return(false);
}
RoleRow role;
if (IsStaleRole(l, out role))
{
return(false);
}
if (l.Count > 1 && throwOnPopulatedRole)
{
throw new ProviderException("Cannot delete populated role.");
}
svc.DeleteObject(role);
svc.SaveChangesWithRetries();
// lets try to remove all remaining elements in the role
foreach (RoleRow row in l)
{
if (row != role)
{
try
{
svc.DeleteObject(row);
svc.SaveChangesWithRetries();
}
catch (InvalidOperationException ex)
{
HttpStatusCode status;
if (TableStorageHelpers.EvaluateException(ex, out status) && (status == HttpStatusCode.NoContent || status == HttpStatusCode.NotFound))
{
// this element already was already deleted by another process or during a failed retry
// this is not a fatal error; continue deleting elements
Log.Write(EventKind.Warning, string.Format(CultureInfo.InstalledUICulture, "The user {0} does not exist in the role {1}.", row.UserName, row.RoleName));
}
else
{
throw new ProviderException(string.Format(CultureInfo.InstalledUICulture, "Error deleting user {0} from role {1}.", row.UserName, row.RoleName));
}
}
}
}
return(true);
}
catch (InvalidOperationException e)
{
throw new ProviderException("Error while accessing the data store.", e);
}
}
// shows alternative ways of generating DataServiceContext objects
internal static void RunSamples2()
{
StorageAccountInfo account = null;
try
{
account = StorageAccountInfo.GetDefaultTableStorageAccountFromConfiguration();
TableStorage tableStorage = TableStorage.Create(account);
tableStorage.RetryPolicy = RetryPolicies.RetryN(3, TimeSpan.FromSeconds(1));
// the DataServiceContext object inherits its retry policy from tableStorage in this case
TableStorageDataServiceContext svc = tableStorage.GetDataServiceContext();
Console.WriteLine("Table creation, delete and list samples...");
string sampleTableName = SampleDataServiceContext.SampleTableName;
tableStorage.TryCreateTable(sampleTableName);
DeleteAllEntriesFromSampleTable(svc, sampleTableName);
Console.WriteLine("List all tables in the account.");
IEnumerable <string> tables2 = tableStorage.ListTables();
foreach (string n1 in tables2)
{
Console.WriteLine(n1);
}
Console.WriteLine("Inserting entities into the table...");
SampleEntity t = new SampleEntity("samplepartitionkey", "samplerowkey");
svc.AddObject(sampleTableName, t);
svc.SaveChangesWithRetries();
//Detach the existing entity so that we can demonstrate the server side
//error when you try to insert an same object with the same keys
svc.Detach(t);
// Insert an entity with the same keys
Console.WriteLine("Try to insert the same entity into the table and show how to deal with error conditions.");
t = new SampleEntity("samplepartitionkey", "samplerowkey");
svc.AddObject(sampleTableName, t);
try
{
svc.SaveChangesWithRetries();
// getting here is an error because inserting the same row twice raises an exception
Console.WriteLine("Should not get here. Succeeded inserting two entities with the same keys");
}
catch (Exception e)
{
HttpStatusCode status;
StorageExtendedErrorInformation errorInfo;
if (TableStorageHelpers.EvaluateException(e, out status, out errorInfo) &&
status == HttpStatusCode.Conflict)
{
// the row has already been inserted before, this is expected here
if (errorInfo != null)
{
Console.WriteLine("Attempting to insert row with same keys resulted in error {0} : {1}",
errorInfo.ErrorCode, errorInfo.ErrorMessage);
}
}
else
{
throw;
}
}
svc.Detach(t);
Console.WriteLine("Insert a large item into the table.");
t = new SampleEntity("samplepartitionkey", "samplerowkey1");
t.B = new String('a', 1000);
svc.AddObject(sampleTableName, t);
svc.SaveChangesWithRetries();
Console.WriteLine("Create a normal DataServiceContext object (not TableStorageDataServiceContext) and attach it to a TableStorage object.");
DataServiceContext svc2 = new DataServiceContext(
TableStorage.GetServiceBaseUri(account.BaseUri, account.UsePathStyleUris, account.AccountName));
tableStorage.Attach(svc2);
var qResult = from c in svc2.CreateQuery <SampleEntity>(sampleTableName)
where c.RowKey == "samplerowkey1"
select c;
foreach (SampleEntity cust in qResult)
{
if (cust.B != t.B)
{
Console.WriteLine("Sample failed. Did not read the entity property just written");
}
}
Console.WriteLine("Insert many rows in a table and show the API for dealing with query result pagination.");
int num = 2100;
Console.WriteLine("Inserting {0} rows.", num.ToString(CultureInfo.CurrentUICulture));
for (int i = 0; i < num; i++)
{
t = new SampleEntity("samplestring", i.ToString(CultureInfo.InvariantCulture));
svc.AddObject(sampleTableName, t);
svc.SaveChangesWithRetries();
if ((i + 1) % 50 == 0)
{
Console.WriteLine("Inserted row {0}.", (i + 1).ToString(CultureInfo.CurrentUICulture));
}
}
Console.WriteLine("Executing query that will return many results. This can take a while...");
var qResult2 = from c in svc.CreateQuery <SampleEntity>(sampleTableName)
where c.PartitionKey == "samplestring"
select c;
TableStorageDataServiceQuery <SampleEntity> tableStorageQuery = new TableStorageDataServiceQuery <SampleEntity>(qResult2 as DataServiceQuery <SampleEntity>);
IEnumerable <SampleEntity> res = tableStorageQuery.ExecuteAllWithRetries();
Console.WriteLine("Retrieved query results:");
foreach (SampleEntity entity in res)
{
Console.WriteLine("Partition key: {0}, row key: {1}.", entity.PartitionKey, entity.RowKey);
}
Console.WriteLine("Delete all entries in the sample table.");
DeleteAllEntriesFromSampleTable(tableStorage.GetDataServiceContext(), sampleTableName);
tableStorage.DeleteTable(sampleTableName);
Console.WriteLine("Table samples finished!");
}
catch (DataServiceRequestException dsre)
{
Console.WriteLine("DataServiceRequestException: " + GetExceptionMessage(dsre));
ShowTableStorageErrorMessage(account.BaseUri.ToString());
}
catch (InvalidOperationException ioe)
{
Console.WriteLine("Storage service error: " + GetExceptionMessage(ioe));
ShowTableStorageErrorMessage(account.BaseUri.ToString());
}
}
