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Implementation carried over from v1.
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masiton
2025-07-05 05:11:04 +02:00
commit 9766124241
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14
code/MessengerApi.QueryClient.Example/MessengerApi.QueryClient.Example.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\MessengerApi.QueryClient\MessengerApi.QueryClient.csproj" />
</ItemGroup>
</Project>

59
code/MessengerApi.QueryClient.Example/Program.cs Normal file
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using MessengerApi.Model;
using MessengerApi.Model.Messages;
using portaloggy;
namespace MessengerApi.Example
{
internal class Program
{
static void Main(string[] args)
{
var logger = new ConsoleLogger() { IsMessageSeverityColoringEnabled = true};
var httpClient = new HttpClient();
// Client 1 will demonstrate querying approach.
var client1 = new QueryClient(
new Credentials(
"aab8f7e9-ad13-4bf8-bb2e-0cd93d81adc0",
"http://localhost:5259"),
httpClient,
logger);
// Client 2 is subscription client waiting for the queries.
var client2 = new SubscriptionClient(
new Credentials(
"8f73f683-7cb3-40df-998e-6e604aef0e53",
"http://localhost:5259"),
httpClient,
logger);
var user1 = Guid.Parse("f696442b-e8dc-4074-b34f-94bcece8e74b");
var user2 = Guid.Parse("15d97720-f5b7-47aa-9c1a-71f98b0b9248");
// Subscribe client 2 to questions.
var client2Subscription = client2.Subscribe("TEST");
client2Subscription.OnMessage += (s, m) =>
{
logger.Info($"Received subscribed message - {m.Payload}");
client2.SendMessage(new OutboxMessage
{
ToUserId = m.Sender,
Payload = "ANSWER",
PayloadType = m.PayloadType
});
};
// Demonstrate query pipeline. Client 1 sends query and waits for response.
// Client 2 is subscribed to those messages and will send an answer right away.
var answer = client1.Query(new OutboxMessage
{
ToUserId = user2,
PayloadType = "TEST",
Payload = "QUESTION"
}).GetAwaiter().GetResult();
logger.Info($"Received answer message to my query with payload: {answer.Payload}.");
}
}
}

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code/MessengerApi.QueryClient.sln Normal file
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code/MessengerApi.QueryClient/MessengerApi.QueryClient.csproj Normal file
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<PropertyGroup>
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<AssemblyVersion>$([System.DateTime]::UtcNow.ToString("yyyy.MM.dd.HHmm"))</AssemblyVersion>
<PackageVersion>$([System.DateTime]::UtcNow.ToString("yyyy.MM.dd.HHmm"))</PackageVersion>
<GeneratePackageOnBuild>True</GeneratePackageOnBuild>
<Title>$(AssemblyName)</Title>
<BaseOutputPath>..\out\</BaseOutputPath>
<PackageTags>logging;log;logger</PackageTags>
<PackageLicenseExpression>mit-0</PackageLicenseExpression>
<ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="MessengerApi.SubscriptionClient" />
<PackageReference Include="portaloggy" />
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code/MessengerApi.QueryClient/QueryClient.cs Normal file
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using portaloggy;
using MessengerApi.Model.Messages;
using MessengerApi.Model;
namespace MessengerApi
{
public interface IQueryClient : IDisposable
{
Task<InboxMessage> Query(OutboxMessage message);
}
public class QueryClient : SubscriptionClient, IQueryClient
{
private readonly int _timeoutInSeconds;
public QueryClient(
Credentials credentials,
HttpClient httpClient = null,
ILogger logger = null,
int maximumPermittedWaitTimeInSeconds = 10) :base(credentials, httpClient, logger)
{
this._timeoutInSeconds = maximumPermittedWaitTimeInSeconds;
}
public async Task<InboxMessage> Query(OutboxMessage message)
{
try
{
var messageTypeMask = $"{message.PayloadType}-{Guid.NewGuid()}";
var maskedMessage = new OutboxMessage
{
Payload = message.Payload,
LifespanInSeconds = message.LifespanInSeconds,
PayloadType = messageTypeMask,
ToUserId = message.ToUserId
};
var cts = new CancellationTokenSource(TimeSpan.FromSeconds(this._timeoutInSeconds));
var sub = this.Subscribe(messageTypeMask);
var result = (InboxMessage)null;
sub.OnMessage += (source, message) =>
{
result = message;
cts.Cancel();
};
this.SendMessage(maskedMessage);
while (!cts.IsCancellationRequested)
{
await Task.Delay(TimeSpan.FromSeconds(1));
}
this.Unsubscribe(sub);
if (result == null)
{
throw new InvalidOperationException("Couldn't retrieve response.");
}
result.PayloadType = message.PayloadType;
return result;
}
catch
{
throw;
}
}
}
}