From edf10b970be7fc65257d987537386bc962ee397f Mon Sep 17 00:00:00 2001
From: Pavel Gross <p.gross@yadro.com>
Date: Mon, 10 Jun 2024 11:11:09 +0300
Subject: [PATCH] [#4] sample for custom Client Cut

Signed-off-by: Pavel Gross <p.gross@yadro.com>
---
 README.md | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 75 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 832b42f..542a544 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ using FrostFS.SDK.ModelsV2;
 using FrostFS.SDK.ModelsV2.Enums;
 using FrostFS.SDK.ModelsV2.Netmap;
 
-var fsClient = new Client(<your_key>, <your_host>);
+var fsClient = Client.GetInstance(<your_key>, <your_host>);
 
 // List containers
 var containersIds = await fsClient.ListContainersAsync();
@@ -55,7 +55,7 @@ using FrostFS.SDK.ModelsV2;
 using FrostFS.SDK.ModelsV2.Enums;
 using FrostFS.SDK.ModelsV2.Netmap;
 
-var fsClient = new Client(<your_key>, <your_host>);
+var fsClient = Client.GetInstance(<your_key>, <your_host>);
 
 // Search regular objects
 var objectsIds = await fsClient.SearchObjectAsync(
@@ -77,4 +77,77 @@ var objHeader = await fsClient.GetObjectHeadAsync(cId, oId);
 
 // Get object
 var obj = await fsClient.GetObjectAsync(cId, oId);
+```
+
+### Custom client cut
+```csharp
+
+using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ModelsV2;
+using FrostFS.SDK.ModelsV2.Enums;
+using FrostFS.SDK.ModelsV2.Netmap;
+using FrostFS.SDK.ClientV2.Extensions;
+using FrostFS.SDK.ClientV2.Interfaces;
+
+var fsClient = Client.GetInstance(<your_key>, <your_host>);
+
+ContainerId containerId = <containerId>;
+string fileName = <fileName>;
+
+await PutObjectClientCut(fsClient, containerId, fileName);
+
+static async Task<ObjectId?> PutObjectClientCut(IFrostFSClient fsClient, ContainerId containerId, string fileName)
+{
+    List<ObjectId> sentObjectIds = [];
+    FrostFS.SDK.ModelsV2.Object? currentObject;
+
+    var partSize = 1024 * 1024;
+    var buffer = new byte[partSize];
+
+    var largeObject = new LargeObject(containerId);
+    
+    var split = new Split();
+   
+    var fileInfo = new FileInfo(fileName);
+    var fullLength = (ulong)fileInfo.Length;
+    var fileNameAttribute = new ObjectAttribute("fileName", fileInfo.Name);
+    
+    using var stream = File.OpenRead(fileName);
+    while (true)
+    {
+        var bytesCount = await stream.ReadAsync(buffer.AsMemory(0, partSize));
+
+        split.Previous = sentObjectIds.LastOrDefault();
+
+        largeObject.AppendBlock(buffer, bytesCount);
+     
+        currentObject = new FrostFS.SDK.ModelsV2.Object(containerId, buffer)
+            .AddAttribute(fileNameAttribute)
+            .SetSplit(split);
+   
+        if (largeObject.PayloadLength == fullLength)
+            break;
+
+        var objectId = await fsClient.PutSingleObjectAsync(currentObject);
+        sentObjectIds.Add(objectId);
+    }
+
+    if (sentObjectIds.Any())
+    {
+        largeObject.CalculateHash();
+
+        var linkObject = new LinkObject(containerId, split.SplitId, largeObject)
+            .AddChildren(sentObjectIds);
+
+        _ = await fsClient.PutSingleObjectAsync(linkObject);
+
+        currentObject.SetParent(largeObject);
+       _ = await fsClient.PutSingleObjectAsync(currentObject);
+
+        return currentObject.GetParentId();
+    }
+
+     return await fsClient.PutSingleObjectAsync(currentObject);
+}
+
 ```
\ No newline at end of file