fix(netflow): изолировать коллектор IPFIX и срезать раздувание базы

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/services/mikrotik.ts

@@ -11,6 +11,16 @@ import type {
   FirewallFamily, FirewallTable,
 } from "../types/server.js"
 
+const MAX_ROS_BODY_BYTES = 8 * 1024 * 1024
+
+function appendRosBody(body: string, chunk: string, req?: http.ClientRequest): string {
+  if (body.length + chunk.length > MAX_ROS_BODY_BYTES) {
+    req?.destroy(new Error("RouterOS: ответ больше 8 МиБ"))
+    return body
+  }
+  return body + chunk
+}
+
 // ── connection params ─────────────────────────────────────────────────────────
 
 export interface MikrotikConnectParams {
@@ -52,7 +62,7 @@ function rosRequest(
     const req = lib.request(options, (res) => {
       let body = ""
       res.setEncoding("utf8")
-      res.on("data", (chunk: string) => { body += chunk })
+      res.on("data", (chunk: string) => { body = appendRosBody(body, chunk, req) })
       res.on("end", () => {
         clearTimeout(timer)
         if (!res.statusCode || res.statusCode < 200 || res.statusCode >= 300) {
@@ -135,7 +145,7 @@ function rosPost(
     req = lib.request(options, (res) => {
       let buf = ""
       res.setEncoding("utf8")
-      res.on("data", (chunk: string) => { buf += chunk })
+      res.on("data", (chunk: string) => { buf = appendRosBody(buf, chunk, req) })
       res.on("end", () => {
         settle(() => {
           if (!res.statusCode || res.statusCode < 200 || res.statusCode >= 300) {
@@ -189,7 +199,7 @@ function rosPut(
     const req = lib.request(options, (res) => {
       let buf = ""
       res.setEncoding("utf8")
-      res.on("data", (chunk: string) => { buf += chunk })
+      res.on("data", (chunk: string) => { buf = appendRosBody(buf, chunk, req) })
       res.on("end", () => {
         clearTimeout(timer)
         if (!res.statusCode || res.statusCode < 200 || res.statusCode >= 300) {
@@ -239,7 +249,7 @@ function rosDelete(
     const req = lib.request(options, (res) => {
       let body = ""
       res.setEncoding("utf8")
-      res.on("data", (chunk: string) => { body += chunk })
+      res.on("data", (chunk: string) => { body = appendRosBody(body, chunk, req) })
       res.on("end", () => {
         clearTimeout(timer)
         if (!res.statusCode || res.statusCode < 200 || res.statusCode >= 300) {
@@ -289,7 +299,7 @@ function rosPatch(
     const req = lib.request(options, (res) => {
       let buf = ""
       res.setEncoding("utf8")
-      res.on("data", (chunk: string) => { buf += chunk })
+      res.on("data", (chunk: string) => { buf = appendRosBody(buf, chunk, req) })
       res.on("end", () => {
         clearTimeout(timer)
         if (!res.statusCode || res.statusCode < 200 || res.statusCode >= 300) {