public void Create(string prefix, string postfix)
{
EtcdCompoundClientFactory factory = new EtcdCompoundClientFactory();
IEtcdCompoundClient client = factory.CreateClient($"{prefix}://127.0.0.1{postfix}");
Assert.IsNotNull(client);
}
public bool CreateLease(string serverUri, long leaseId, long ttl)
{
using (IEtcdCompoundClient client = _etcdCompoundClientFactory.CreateClient(serverUri))
{
_log.Debug($"Creating lease {leaseId} wit ttl {ttl}");
try
{
var leaseGrantResponse = client.LeaseGrant(new LeaseGrantRequest {
TTL = ttl, ID = leaseId
});
if (!String.IsNullOrEmpty(leaseGrantResponse.Error))
{
_log.Error($"Lease id {leaseId}, ttl {ttl}, error creating: {leaseGrantResponse}");
return(false);
}
_log.Info($"Lease {leaseId} created with ttl {ttl}");
_log.Debug(leaseGrantResponse);
return(true);
}
catch (Exception ex)
{
_log.Error($"Lease id {leaseId}, ttl {ttl}, exception creating: {ex}");
return(false);
}
}
}
private string GetKey(IEtcdCompoundClient client, string key)
{
RangeResponse response = client.Get(key);
if (response.Count == 0 || response.Kvs.Count == 0)
{
return(null);
}
return(response.Kvs[0].Value.ToStringUtf8());
}
public Task StartKeepAlive(string serverUri, long leaseId, CancellationToken token)
{
try
{
using (IEtcdCompoundClient client = _etcdCompoundClientFactory.CreateClient(serverUri))
{
return(client.LeaseKeepAlive(leaseId, token));
}
}
catch (Exception ex)
{
_log.Error($"KeepAlive starting failure: {ex}");
return(null);
}
}
public string GetKey(string serverUri, string key)
{
try
{
using (IEtcdCompoundClient client = _etcdCompoundClientFactory.CreateClient(serverUri))
{
return(GetKey(client, key));
}
}
catch (Exception ex)
{
_log.Error($"Get {key} failure: {ex}");
return(null);
}
}
public bool LockLeader(string serverUri, long leaseId)
{
try
{
using (IEtcdCompoundClient client = _etcdCompoundClientFactory.CreateClient(serverUri))
{
var transactionRequest = new TxnRequest();
transactionRequest.Compare.Add
(
new Compare
{
Key = ByteString.CopyFromUtf8(KEY_LEADER_ELECTION),
Target = Compare.Types.CompareTarget.Create,
Result = Compare.Types.CompareResult.Greater,
CreateRevision = 0
}
);
transactionRequest.Failure.Add(new RequestOp
{
RequestPut = new PutRequest
{
Key = ByteString.CopyFromUtf8(KEY_LEADER_ELECTION),
Value = ByteString.CopyFromUtf8(leaseId.ToString()),
Lease = leaseId
}
});
_ = client.Transaction(transactionRequest);
string keyValueInDatabase = GetKey(client, KEY_LEADER_ELECTION);
if (String.IsNullOrEmpty(keyValueInDatabase))
{
return(false);
}
return(Convert.ToInt64(keyValueInDatabase) == leaseId);
}
}
catch (Exception ex)
{
_log.Error($"Leader locking fo lease {leaseId} exception: {ex}");
return(false);
}
}
