private async Task UpsertExistingNodeReturnsTrue(IDgraphClient client)
{
var upsertResult =
await client.Upsert(
nameof(User.Username),
GraphValue.BuildStringValue(User1.Username),
JsonConvert.SerializeObject(User1));
AssertResultIsSuccess(upsertResult);
var(node, existing) = upsertResult.Value;
existing.Should().BeTrue();
string.Format("0x{0:x}", node.UID).Should().Be(User1.uid);
}
private async Task UpsertNewNodeReturnsFalse(IDgraphClient client)
{
User1.uid = "_:myBlank";
var upsertResult =
await client.Upsert(
nameof(User.Username),
GraphValue.BuildStringValue(User1.Username),
JsonConvert.SerializeObject(User1),
"myBlank");
AssertResultIsSuccess(upsertResult);
var(node, existing) = upsertResult.Value;
existing.Should().BeFalse();
User1.uid = string.Format("0x{0:x}", node.UID);
}
private async Task ConcurrentUpsertsWorkCorrectly(IDgraphClient client)
{
var user2 = MintAUser("User2");
user2.uid = "_:myBlank";
var predicate = nameof(User.Username);
var username = GraphValue.BuildStringValue(user2.Username);
var json = JsonConvert.SerializeObject(user2);
var tasks = Enumerable.Range(0, 10).
Select(i => client.Upsert(
predicate,
username,
json,
"myBlank"));
var results = await Task.WhenAll(tasks.ToList());
foreach (var result in results)
{
AssertResultIsSuccess(result);
}
// Only one upsert should have acually written a value
results.Select(r => r.Value.existing).Where(exists => !exists).Count().Should().Be(1);
// Only one uid is ever seen
var theUids = results.Select(r => r.Value.node.UID).Distinct();
theUids.Count().Should().Be(1);
// There's only one copy of user2 in the DB
var queryResult = await client.QueryWithVars(
UsersByName,
new Dictionary <string, string> {
{ "$name", user2.Username }
});
AssertResultIsSuccess(queryResult);
var users = (JArray)JObject.Parse(queryResult.Value) ["q"];
users.Count.Should().Be(1);
var user = users[0].ToObject <User>();
string.Format("0x{0:x}", theUids.First()).Should().Be(user.uid);
user.Username.Should().Be(user2.Username);
}
static async Task Main(string[] args)
{
using (IDgraphClient client = DgraphDotNet.Clients.NewDgraphClient()) {
client.Connect("127.0.0.1:9080");
await client.AlterSchema(
"Username: string @index(hash) .\n"
+ "Password: password .");
var schemaResult = await client.SchemaQuery();
if (schemaResult.IsFailed)
{
Console.WriteLine($"Something went wrong getting schema.");
return;
}
Console.WriteLine("Queried schema and got :");
foreach (var predicate in schemaResult.Value.Schema)
{
Console.WriteLine(predicate.ToString());
}
while (true)
{
Console.WriteLine("Hi, please enter your new username");
var username = Console.ReadLine();
// use Upsert to test for a node and value, and create if
// not already in the graph as an atomic operation.
var result = await client.Upsert(
"Username",
GraphValue.BuildStringValue(username),
$"{{\"uid\": \"_:myBlank\", \"Username\": \"{username}\"}}",
"myBlank");
if (result.IsFailed)
{
Console.WriteLine("Something went wrong : " + result);
continue;
}
var(node, existed) = result.Value;
if (existed)
{
Console.WriteLine("This user already existed. Try another username.");
continue;
}
Console.WriteLine("Hi, please enter a password for the new user");
var password = Console.ReadLine();
using (var txn = client.NewTransaction()) {
var mutation = txn.NewMutation();
var property = Clients.BuildProperty(node, "Password", GraphValue.BuildPasswordValue(password));
if (property.IsFailed)
{
// ... something went wrong
Console.Write("uhh");
}
else
{
mutation.AddProperty(property.Value);
var err = await mutation.Submit();
if (err.IsFailed)
{
// ... something went wrong
Console.Write(err);
}
}
await txn.Commit();
}
}
}
}