Add resource usage stats to the compose page (#700)

Co-authored-by: cmcooper1980 <31871143+cmcooper1980@users.noreply.github.com>

backend/dockge-server.ts

@@ -637,6 +637,35 @@ export class DockgeServer {
         return list;
     }
 
+    async getDockerStats() : Promise<Map<string, object>> {
+        let stats = new Map<string, object>();
+
+        try {
+            let res = await childProcessAsync.spawn("docker", [ "stats", "--format", "json", "--no-stream" ], {
+                encoding: "utf-8",
+            });
+
+            if (!res.stdout) {
+                return stats;
+            }
+
+            let lines = res.stdout?.toString().split("\n");
+
+            for (let line of lines) {
+                try {
+                    let obj = JSON.parse(line);
+                    stats.set(obj.Name, obj);
+                } catch (e) {
+                }
+            }
+
+            return stats;
+        } catch (e) {
+            log.error("getDockerStats", e);
+            return stats;
+        }
+    }
+
     get stackDirFullPath() {
         return path.resolve(this.stacksDir);
     }