feat(docker): Gracefully reload Caddy configuration

CaddyManager.Services/Docker/DockerService.cs

@@ -15,12 +15,8 @@ public class DockerService(IConfigurationsService configurationsService) : IDock
     /// Method to get the container id of the Caddy container by the name configured
     /// </summary>
     /// <returns></returns>
-    private async Task<string> GetCaddyContainerId()
+    private async Task<string> GetCaddyContainerId(IDockerClient client)
     {
-        var client = new DockerClientConfiguration(new Uri(Configuration.DockerHostWithEnvCheck)).CreateClient();
-
-        if (client == null) return string.Empty;
-        
         var containers = await client.Containers.ListContainersAsync(new ContainersListParameters
         {
             All = true
@@ -30,19 +26,75 @@ public class DockerService(IConfigurationsService configurationsService) : IDock
             ?.ID ?? string.Empty;
 
     }
-    
+
+    private IDockerClient CreateClient() =>
+        new DockerClientConfiguration(new Uri(Configuration.DockerHostWithEnvCheck)).CreateClient();
+
     /// <inheritdoc />
     public async Task RestartCaddyContainerAsync()
     {
-        var containerId = await GetCaddyContainerId();
-        
-        if (string.IsNullOrEmpty(containerId)) return;
-        
-        var client = new DockerClientConfiguration(new Uri(Configuration.DockerHostWithEnvCheck)).CreateClient();
+        using var client = CreateClient();
 
-        if (client != null)
+        var containerId = await GetCaddyContainerId(client);
+
+        if (string.IsNullOrEmpty(containerId)) return;
+
+        await client.Containers.RestartContainerAsync(containerId, new ContainerRestartParameters());
+    }
+
+    /// <inheritdoc />
+    public async Task<CaddyReloadResponse> ReloadCaddyContainerAsync()
+    {
+        try
         {
-            await client.Containers.RestartContainerAsync(containerId, new ContainerRestartParameters());
+            using var client = CreateClient();
+
+            var containerId = await GetCaddyContainerId(client);
+
+            if (string.IsNullOrEmpty(containerId))
+            {
+                return new CaddyReloadResponse
+                {
+                    Message = $"Caddy container '{Configuration.CaddyContainerName}' was not found"
+                };
+            }
+
+            var exec = await client.Exec.ExecCreateContainerAsync(containerId, new ContainerExecCreateParameters
+            {
+                Cmd = ["caddy", "reload", "--config", Configuration.CaddyConfigPathInContainer],
+                AttachStdout = true,
+                AttachStderr = true
+            });
+
+            string stdout, stderr;
+
+            using (var stream = await client.Exec.StartAndAttachContainerExecAsync(exec.ID, false))
+            {
+                (stdout, stderr) = await stream.ReadOutputToEndAsync(CancellationToken.None);
+            }
+
+            var inspection = await client.Exec.InspectContainerExecAsync(exec.ID);
+
+            if (inspection.ExitCode == 0)
+            {
+                return new CaddyReloadResponse { Success = true };
+            }
+
+            // Caddy reports errors on stderr, interleaved with its structured JSON progress logs which are noise here
+            var output = string.Join(Environment.NewLine, $"{stderr}{Environment.NewLine}{stdout}"
+                .Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
+                .Where(line => !line.StartsWith('{')));
+
+            return new CaddyReloadResponse
+            {
+                Message = string.IsNullOrWhiteSpace(output)
+                    ? $"Caddy reload failed with exit code {inspection.ExitCode}"
+                    : output.Trim()
+            };
+        }
+        catch (Exception e)
+        {
+            return new CaddyReloadResponse { Message = e.Message };
         }
     }
 }