feat(api): add endpoint to retrieve container stats

- Introduced a new GET endpoint `/docker/stats/:id` to fetch statistics for a specified container by its ID or route alias.
- Implemented the `Stats` function in the `dockerapi` package to handle the request and return container stats in both JSON and WebSocket formats.
- Added error handling for invalid requests and container not found scenarios.

internal/api/v1/docker/stats.go

@@ -0,0 +1,117 @@
+package dockerapi
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/moby/moby/api/types/container"
+	"github.com/moby/moby/client"
+	"github.com/yusing/godoxy/internal/docker"
+	"github.com/yusing/godoxy/internal/route/routes"
+	"github.com/yusing/godoxy/internal/types"
+	apitypes "github.com/yusing/goutils/apitypes"
+	"github.com/yusing/goutils/http/httpheaders"
+	"github.com/yusing/goutils/http/websocket"
+	"github.com/yusing/goutils/synk"
+	"github.com/yusing/goutils/task"
+)
+
+type ContainerStatsResponse container.StatsResponse // @name ContainerStatsResponse
+
+// @x-id				"stats"
+// @BasePath		/api/v1
+// @Summary		Get container stats
+// @Description	Get container stats by container id
+// @Tags			docker,websocket
+// @Produce		json
+// @Param			id	path		string	true	"Container ID or route alias"
+// @Success		200	{object}	ContainerStatsResponse
+// @Failure		400	{object}	apitypes.ErrorResponse "Invalid request: id is required or route is not a docker container"
+// @Failure		403	{object}	apitypes.ErrorResponse
+// @Failure		404	{object}	apitypes.ErrorResponse "Container not found"
+// @Failure		500	{object}	apitypes.ErrorResponse
+// @Router			/docker/stats/{id} [get]
+func Stats(c *gin.Context) {
+	id := c.Param("id")
+	if id == "" {
+		c.JSON(http.StatusBadRequest, apitypes.Error("id is required"))
+		return
+	}
+
+	dockerCfg, ok := docker.GetDockerCfgByContainerID(id)
+	if !ok {
+		var route types.Route
+		route, ok = routes.GetIncludeExcluded(id)
+		if ok {
+			cont := route.ContainerInfo()
+			if cont == nil {
+				c.JSON(http.StatusBadRequest, apitypes.Error("route is not a docker container"))
+				return
+			}
+			dockerCfg = cont.DockerCfg
+			id = cont.ContainerID
+		}
+	}
+	if !ok {
+		c.JSON(http.StatusNotFound, apitypes.Error("container or route not found"))
+		return
+	}
+
+	dockerClient, err := docker.NewClient(dockerCfg)
+	if err != nil {
+		c.Error(apitypes.InternalServerError(err, "failed to create docker client"))
+		return
+	}
+	defer dockerClient.Close()
+
+	if httpheaders.IsWebsocket(c.Request.Header) {
+		stats, err := dockerClient.ContainerStats(c.Request.Context(), id, client.ContainerStatsOptions{Stream: true})
+		if err != nil {
+			c.Error(apitypes.InternalServerError(err, "failed to get container stats"))
+			return
+		}
+		defer stats.Body.Close()
+
+		manager, err := websocket.NewManagerWithUpgrade(c)
+		if err != nil {
+			c.Error(apitypes.InternalServerError(err, "failed to create websocket manager"))
+			return
+		}
+		defer manager.Close()
+
+		buf := synk.GetSizedBytesPool().GetSized(4096)
+		defer synk.GetSizedBytesPool().Put(buf)
+
+		for {
+			select {
+			case <-manager.Done():
+				return
+			default:
+				_, err = io.CopyBuffer(manager.NewWriter(websocket.TextMessage), stats.Body, buf)
+				if err != nil {
+					if errors.Is(err, context.Canceled) || errors.Is(err, task.ErrProgramExiting) {
+						return
+					}
+					c.Error(apitypes.InternalServerError(err, "failed to copy container stats"))
+					return
+				}
+			}
+		}
+	}
+
+	stats, err := dockerClient.ContainerStats(c.Request.Context(), id, client.ContainerStatsOptions{Stream: false})
+	if err != nil {
+		c.Error(apitypes.InternalServerError(err, "failed to get container stats"))
+		return
+	}
+	defer stats.Body.Close()
+
+	_, err = io.Copy(c.Writer, stats.Body)
+	if err != nil {
+		c.Error(apitypes.InternalServerError(err, "failed to copy container stats"))
+		return
+	}
+}