public async Task MasterElectionIntegrationTest()
{
var nodeA = new Master("A", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(10));
var nodeB = new Master("B", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(10));
var nodeC = new Master("C", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(10));
Link(nodeA, nodeB, nodeC);
var A = nodeA.GetMaster();
var B = nodeB.GetMaster();
var C = nodeC.GetMaster();
await A; await B; await C;
//sometimes two different masters get elected for the first two rounds
//when two nodes startup very close together so wait until we've checked
//the master a second time
A = nodeA.GetMaster();
B = nodeB.GetMaster();
C = nodeC.GetMaster();
Assert.AreEqual(await A, await B);
Assert.AreEqual(await B, await C);
var master = await A;
DateTime start = DateTime.UtcNow;
while (DateTime.UtcNow.Subtract(start) < TimeSpan.FromSeconds(30))
{
await Task.Delay(200);
MastersLive(master, nodeA, nodeB, nodeC);
Console.WriteLine("Correct At: " + DateTime.UtcNow.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ssK"));
}
}
public async Task TestMasterElection()
{
var nodeA = new Master("A", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(20));
var nodeB = new Master("B", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(20));
var nodeC = new Master("C", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(20));
Link(nodeA, nodeB, nodeC);
var A = nodeA.GetMaster();
var B = nodeB.GetMaster();
var C = nodeC.GetMaster();
Assert.AreEqual(await A, await B);
Assert.AreEqual(await B, await C);
MastersMatch(nodeA, nodeB, nodeC);
}
public async Task MasterElectionIntegrationTest2()
{
DateTime Start = DateTime.UtcNow;
Console.WriteLine("Start: " + Start.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ssK") + " (+0ms)");
var nodeA = new Master("A", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(20));
var nodeB = new Master("B", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(20));
var nodeC = new Master("C", 3, TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(20));
Link(nodeA, nodeB, nodeC);
//the one that goes first is always elected if everyone else waits
Assert.AreEqual("A", await nodeA.GetMaster());
Assert.AreEqual("A", await nodeB.GetMaster());
Assert.AreEqual("A", await nodeC.GetMaster());
nodeA.Connected = false;
DateTime KillTime = DateTime.UtcNow;
Console.WriteLine("Master Killed: " + KillTime.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ssK") + " (+" + KillTime.Subtract(Start).TotalMilliseconds + "ms)");
var leaseExpired = false;
string master;
while (!leaseExpired && nodeB.TryGetMaster(out master)) await Task.Yield();
DateTime LeaseExpireTime = DateTime.UtcNow;
Console.WriteLine("Lease Expired: " + LeaseExpireTime.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ssK") + " (+" + LeaseExpireTime.Subtract(Start).TotalMilliseconds + "ms)");
master = await nodeB.GetMaster();
Console.WriteLine("New Master: " + master);
DateTime End = DateTime.UtcNow;
Console.WriteLine("New Master Elected: " + End.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ssK") + " (+" + End.Subtract(Start).TotalMilliseconds + "ms)");
}