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+/*
+* Copyright (c) 2022 Vaughn Nugent
+*
+* Library: VNLib
+* Package: VNLib.Data.Caching
+* File: ClientExtensions.cs
+*
+* ClientExtensions.cs is part of VNLib.Data.Caching which is part of the larger
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Data.Caching is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* VNLib.Data.Caching is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program. If not, see https://www.gnu.org/licenses/.
+*/
+
+using System;
+using System.IO;
+using System.Linq;
+using System.Buffers;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+using VNLib.Utils.Logging;
+using VNLib.Net.Messaging.FBM;
+using VNLib.Net.Messaging.FBM.Client;
+using VNLib.Net.Messaging.FBM.Server;
+using VNLib.Data.Caching.Exceptions;
+
+using static VNLib.Data.Caching.Constants;
+
+namespace VNLib.Data.Caching
+{
+
+ /// <summary>
+ /// Provides caching extension methods for <see cref="FBMClient"/>
+ /// </summary>
+ public static class ClientExtensions
+ {
+ private static readonly JsonSerializerOptions LocalOptions = new()
+ {
+ DictionaryKeyPolicy = JsonNamingPolicy.CamelCase,
+ NumberHandling = JsonNumberHandling.Strict,
+ ReadCommentHandling = JsonCommentHandling.Disallow,
+ WriteIndented = false,
+ DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
+ IgnoreReadOnlyFields = true,
+ PropertyNameCaseInsensitive = true,
+ IncludeFields = false,
+
+ //Use small buffers
+ DefaultBufferSize = 128
+ };
+
+ private static void LogDebug(this FBMClient client, string message, params object?[] args)
+ {
+ if (client.Config.DebugLog != null)
+ {
+ client.Config.DebugLog.Debug($"[CACHE] : {message}", args);
+ }
+ }
+
+ /// <summary>
+ /// Gets an object from the server if it exists
+ /// </summary>
+ /// <typeparam name="T"></typeparam>
+ /// <param name="client"></param>
+ /// <param name="objectId">The id of the object to get</param>
+ /// <param name="cancellationToken">A token to cancel the operation</param>
+ /// <returns>A task that completes to return the results of the response payload</returns>
+ /// <exception cref="JsonException"></exception>
+ /// <exception cref="OutOfMemoryException"></exception>
+ /// <exception cref="InvalidStatusException"></exception>
+ /// <exception cref="ObjectDisposedException"></exception>
+ /// <exception cref="InvalidResponseException"></exception>
+ public static async Task<T?> GetObjectAsync<T>(this FBMClient client, string objectId, CancellationToken cancellationToken = default)
+ {
+ _ = client ?? throw new ArgumentNullException(nameof(client));
+
+ client.LogDebug("Getting object {id}", objectId);
+
+ //Rent a new request
+ FBMRequest request = client.RentRequest();
+ try
+ {
+ //Set action as get/create
+ request.WriteHeader(HeaderCommand.Action, Actions.Get);
+ //Set session-id header
+ request.WriteHeader(Constants.ObjectId, objectId);
+
+ //Make request
+ using FBMResponse response = await client.SendAsync(request, cancellationToken);
+
+ response.ThrowIfNotSet();
+ //Get the status code
+ ReadOnlyMemory<char> status = response.Headers.FirstOrDefault(static a => a.Key == HeaderCommand.Status).Value;
+ if (status.Span.Equals(ResponseCodes.Okay, StringComparison.Ordinal))
+ {
+ return JsonSerializer.Deserialize<T>(response.ResponseBody, LocalOptions);
+ }
+ //Session may not exist on the server yet
+ if (status.Span.Equals(ResponseCodes.NotFound, StringComparison.Ordinal))
+ {
+ return default;
+ }
+ throw new InvalidStatusException("Invalid status code recived for object get request", status.ToString());
+ }
+ finally
+ {
+ client.ReturnRequest(request);
+ }
+ }
+
+ /// <summary>
+ /// Updates the state of the object, and optionally updates the ID of the object. The data
+ /// parameter is serialized, buffered, and streamed to the remote server
+ /// </summary>
+ /// <typeparam name="T"></typeparam>
+ /// <param name="client"></param>
+ /// <param name="objectId">The id of the object to update or replace</param>
+ /// <param name="newId">An optional parameter to specify a new ID for the old object</param>
+ /// <param name="data">The payload data to serialize and set as the data state of the session</param>
+ /// <param name="cancellationToken">A token to cancel the operation</param>
+ /// <returns>A task that resolves when the server responds</returns>
+ /// <exception cref="JsonException"></exception>
+ /// <exception cref="OutOfMemoryException"></exception>
+ /// <exception cref="InvalidStatusException"></exception>
+ /// <exception cref="ObjectDisposedException"></exception>
+ /// <exception cref="InvalidResponseException"></exception>
+ /// <exception cref="MessageTooLargeException"></exception>
+ /// <exception cref="ObjectNotFoundException"></exception>
+ public static async Task AddOrUpdateObjectAsync<T>(this FBMClient client, string objectId, string? newId, T data, CancellationToken cancellationToken = default)
+ {
+ _ = client ?? throw new ArgumentNullException(nameof(client));
+
+ client.LogDebug("Updating object {id}, newid {nid}", objectId, newId);
+
+ //Rent a new request
+ FBMRequest request = client.RentRequest();
+ try
+ {
+ //Set action as get/create
+ request.WriteHeader(HeaderCommand.Action, Actions.AddOrUpdate);
+ //Set session-id header
+ request.WriteHeader(Constants.ObjectId, objectId);
+ //if new-id set, set the new-id header
+ if (!string.IsNullOrWhiteSpace(newId))
+ {
+ request.WriteHeader(Constants.NewObjectId, newId);
+ }
+ //Get the body writer for the message
+ IBufferWriter<byte> bodyWriter = request.GetBodyWriter();
+ //Write json data to the message
+ using (Utf8JsonWriter jsonWriter = new(bodyWriter))
+ {
+ JsonSerializer.Serialize(jsonWriter, data, LocalOptions);
+ }
+
+ //Make request
+ using FBMResponse response = await client.SendAsync(request, cancellationToken);
+
+ response.ThrowIfNotSet();
+ //Get the status code
+ ReadOnlyMemory<char> status = response.Headers.FirstOrDefault(static a => a.Key == HeaderCommand.Status).Value;
+ //Check status code
+ if (status.Span.Equals(ResponseCodes.Okay, StringComparison.OrdinalIgnoreCase))
+ {
+ return;
+ }
+ else if(status.Span.Equals(ResponseCodes.NotFound, StringComparison.OrdinalIgnoreCase))
+ {
+ throw new ObjectNotFoundException($"object {objectId} not found on remote server");
+ }
+ //Invalid status
+ throw new InvalidStatusException("Invalid status code recived for object upsert request", status.ToString());
+ }
+ finally
+ {
+ //Return the request(clears data and reset)
+ client.ReturnRequest(request);
+ }
+ }
+
+ /// <summary>
+ /// Asynchronously deletes an object in the remote store
+ /// </summary>
+ /// <param name="client"></param>
+ /// <param name="objectId">The id of the object to update or replace</param>
+ /// <param name="cancellationToken">A token to cancel the operation</param>
+ /// <returns>A task that resolves when the operation has completed</returns>
+ /// <exception cref="InvalidStatusException"></exception>
+ /// <exception cref="ObjectDisposedException"></exception>
+ /// <exception cref="InvalidResponseException"></exception>
+ /// <exception cref="ObjectNotFoundException"></exception>
+ public static async Task DeleteObjectAsync(this FBMClient client, string objectId, CancellationToken cancellationToken = default)
+ {
+ _ = client ?? throw new ArgumentNullException(nameof(client));
+
+ client.LogDebug("Deleting object {id}", objectId);
+ //Rent a new request
+ FBMRequest request = client.RentRequest();
+ try
+ {
+ //Set action as delete
+ request.WriteHeader(HeaderCommand.Action, Actions.Delete);
+ //Set session-id header
+ request.WriteHeader(Constants.ObjectId, objectId);
+
+ //Make request
+ using FBMResponse response = await client.SendAsync(request, cancellationToken);
+
+ response.ThrowIfNotSet();
+ //Get the status code
+ ReadOnlyMemory<char> status = response.Headers.FirstOrDefault(static a => a.Key == HeaderCommand.Status).Value;
+ if (status.Span.Equals(ResponseCodes.Okay, StringComparison.Ordinal))
+ {
+ return;
+ }
+ else if(status.Span.Equals(ResponseCodes.NotFound, StringComparison.OrdinalIgnoreCase))
+ {
+ throw new ObjectNotFoundException($"object {objectId} not found on remote server");
+ }
+ throw new InvalidStatusException("Invalid status code recived for object get request", status.ToString());
+ }
+ finally
+ {
+ client.ReturnRequest(request);
+ }
+ }
+
+ /// <summary>
+ /// Dequeues a change event from the server event queue for the current connection, or waits until a change happens
+ /// </summary>
+ /// <param name="client"></param>
+ /// <param name="cancellationToken">A token to cancel the deuque operation</param>
+ /// <returns>A <see cref="KeyValuePair{TKey, TValue}"/> that contains the modified object id and optionally its new id</returns>
+ public static async Task<WaitForChangeResult> WaitForChangeAsync(this FBMClient client, CancellationToken cancellationToken = default)
+ {
+ //Rent a new request
+ FBMRequest request = client.RentRequest();
+ try
+ {
+ //Set action as event dequeue to dequeue a change event
+ request.WriteHeader(HeaderCommand.Action, Actions.Dequeue);
+
+ //Make request
+ using FBMResponse response = await client.SendAsync(request, cancellationToken);
+
+ response.ThrowIfNotSet();
+
+ return new()
+ {
+ Status = response.Headers.FirstOrDefault(static a => a.Key == HeaderCommand.Status).Value.ToString(),
+ CurrentId = response.Headers.SingleOrDefault(static v => v.Key == Constants.ObjectId).Value.ToString(),
+ NewId = response.Headers.SingleOrDefault(static v => v.Key == Constants.NewObjectId).Value.ToString()
+ };
+ }
+ finally
+ {
+ client.ReturnRequest(request);
+ }
+ }
+
+ /// <summary>
+ /// Gets the Object-id for the request message, or throws an <see cref="InvalidOperationException"/> if not specified
+ /// </summary>
+ /// <param name="context"></param>
+ /// <returns>The id of the object requested</returns>
+ /// <exception cref="InvalidOperationException"></exception>
+ public static string ObjectId(this FBMContext context)
+ {
+ return context.Request.Headers.First(static kvp => kvp.Key == Constants.ObjectId).Value.ToString();
+ }
+ /// <summary>
+ /// Gets the new ID of the object if specified from the request. Null if the request did not specify an id update
+ /// </summary>
+ /// <param name="context"></param>
+ /// <returns>The new ID of the object if speicifed, null otherwise</returns>
+ public static string? NewObjectId(this FBMContext context)
+ {
+ return context.Request.Headers.FirstOrDefault(static kvp => kvp.Key == Constants.NewObjectId).Value.ToString();
+ }
+ /// <summary>
+ /// Gets the request method for the request
+ /// </summary>
+ /// <param name="context"></param>
+ /// <returns>The request method string</returns>
+ public static string Method(this FBMContext context)
+ {
+ return context.Request.Headers.First(static kvp => kvp.Key == HeaderCommand.Action).Value.ToString();
+ }
+ /// <summary>
+ /// Closes a response with a status code
+ /// </summary>
+ /// <param name="context"></param>
+ /// <param name="responseCode">The status code to send to the client</param>
+ public static void CloseResponse(this FBMContext context, string responseCode)
+ {
+ context.Response.WriteHeader(HeaderCommand.Status, responseCode);
+ }
+
+
+ /// <summary>
+ /// Initializes the worker for a reconnect policy and returns an object that can listen for changes
+ /// and configure the connection as necessary
+ /// </summary>
+ /// <param name="worker"></param>
+ /// <param name="retryDelay">The amount of time to wait between retries</param>
+ /// <param name="serverUri">The uri to reconnect the client to</param>
+ /// <returns>A <see cref="ClientRetryManager{T}"/> for listening for retry events</returns>
+ public static ClientRetryManager<T> SetReconnectPolicy<T>(this T worker, TimeSpan retryDelay, Uri serverUri) where T: IStatefulConnection
+ {
+ //Return new manager
+ return new (worker, retryDelay, serverUri);
+ }
+ }
+}