public async Task <E2EUser> GetUserById(string userId)
{
Guid.Parse(userId);
await SemaphoreSlim.WaitAsync();
try
{
var contact = await this.contacts.Get(userId);
Debug.Assert(contact.Id == userId);
E2EUser user = E2EUserSerializer.Deserialize(contact.CryptographicInformation);
if (user == null) // for example, when the contact has just been added
{
user = new E2EUser {
DynamicPrivateDecryptionKeys = new Dictionary <long, byte[]>()
}
}
;
user.UserId = userId;
user.StaticPublicKey = contact.StaticPublicKey;
return(user);
}
finally
{
SemaphoreSlim.Release();
}
}
public async Task UpdateUser(E2EUser user)
{
Guid.Parse(user.UserId);
await SemaphoreSlim.WaitAsync();
try
{
Identity contact = await this.contacts.Get(user.UserId);
var serialized = E2EUserSerializer.Serialize(user);
contact.CryptographicInformation = serialized;
await this.contacts.Update(contact);
}
finally
{
SemaphoreSlim.Release();
}
}