use node:net to directly send 4lw commands for zookeeper health check

Signed-off-by: Aayush Gupta <aayu.gupta.96@gmail.com>

package-lock.json

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-        "node_modules/strip-dirs": {
-            "version": "2.1.0",
-            "resolved": "https://registry.npmjs.org/strip-dirs/-/strip-dirs-2.1.0.tgz",
-            "integrity": "sha512-JOCxOeKLm2CAS73y/U4ZeZPTkE+gNVCzKt7Eox84Iej1LT/2pTWYpZKJuxwQpvX1LiZb1xokNR7RLfuBAa7T3g==",
-            "dependencies": {
-                "is-natural-number": "^4.0.1"
-            }
-        },
         "node_modules/strip-final-newline": {
             "version": "2.0.0",
             "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-2.0.0.tgz",
@@ -15325,59 +15062,6 @@
                 "node": ">=10"
             }
         },
-        "node_modules/tar-stream": {
-            "version": "1.6.2",
-            "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.6.2.tgz",
-            "integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==",
-            "dependencies": {
-                "bl": "^1.0.0",
-                "buffer-alloc": "^1.2.0",
-                "end-of-stream": "^1.0.0",
-                "fs-constants": "^1.0.0",
-                "readable-stream": "^2.3.0",
-                "to-buffer": "^1.1.1",
-                "xtend": "^4.0.0"
-            },
-            "engines": {
-                "node": ">= 0.8.0"
-            }
-        },
-        "node_modules/tar-stream/node_modules/bl": {
-            "version": "1.2.3",
-            "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.3.tgz",
-            "integrity": "sha512-pvcNpa0UU69UT341rO6AYy4FVAIkUHuZXRIWbq+zHnsVcRzDDjIAhGuuYoi0d//cwIwtt4pkpKycWEfjdV+vww==",
-            "dependencies": {
-                "readable-stream": "^2.3.5",
-                "safe-buffer": "^5.1.1"
-            }
-        },
-        "node_modules/tar-stream/node_modules/isarray": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
-            "integrity": "sha512-VLghIWNM6ELQzo7zwmcg0NmTVyWKYjvIeM83yjp0wRDTmUnrM678fQbcKBo6n2CJEF0szoG//ytg+TKla89ALQ=="
-        },
-        "node_modules/tar-stream/node_modules/readable-stream": {
-            "version": "2.3.8",
-            "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.8.tgz",
-            "integrity": "sha512-8p0AUk4XODgIewSi0l8Epjs+EVnWiK7NoDIEGU0HhE7+ZyY8D1IMY7odu5lRrFXGg71L15KG8QrPmum45RTtdA==",
-            "dependencies": {
-                "core-util-is": "~1.0.0",
-                "inherits": "~2.0.3",
-                "isarray": "~1.0.0",
-                "process-nextick-args": "~2.0.0",
-                "safe-buffer": "~5.1.1",
-                "string_decoder": "~1.1.1",
-                "util-deprecate": "~1.0.1"
-            }
-        },
-        "node_modules/tar-stream/node_modules/string_decoder": {
-            "version": "1.1.1",
-            "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
-            "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
-            "dependencies": {
-                "safe-buffer": "~5.1.0"
-            }
-        },
         "node_modules/tar/node_modules/minipass": {
             "version": "5.0.0",
             "resolved": "https://registry.npmjs.org/minipass/-/minipass-5.0.0.tgz",
@@ -15596,7 +15280,8 @@
         "node_modules/through": {
             "version": "2.3.8",
             "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
-            "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg=="
+            "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg==",
+            "dev": true
         },
         "node_modules/tildify": {
             "version": "2.0.0",
@@ -15630,11 +15315,6 @@
             "integrity": "sha512-3f0uOEAQwIqGuWW2MVzYg8fV/QNnc/IpuJNG837rLuczAaLVHslWHZQj4IGiEl5Hs3kkbhwL9Ab7Hrsmuj+Smw==",
             "dev": true
         },
-        "node_modules/to-buffer": {
-            "version": "1.1.1",
-            "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz",
-            "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg=="
-        },
         "node_modules/to-fast-properties": {
             "version": "2.0.0",
             "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -15910,15 +15590,6 @@
                 "url": "https://github.com/sponsors/ljharb"
             }
         },
-        "node_modules/unbzip2-stream": {
-            "version": "1.4.3",
-            "resolved": "https://registry.npmjs.org/unbzip2-stream/-/unbzip2-stream-1.4.3.tgz",
-            "integrity": "sha512-mlExGW4w71ebDJviH16lQLtZS32VKqsSfk80GCfUlwT/4/hNRFsoscrF/c++9xinkMzECL1uL9DDwXqFWkruPg==",
-            "dependencies": {
-                "buffer": "^5.2.1",
-                "through": "^2.3.8"
-            }
-        },
         "node_modules/underscore": {
             "version": "1.13.6",
             "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.6.tgz",
@@ -16737,6 +16408,7 @@
             "version": "2.10.0",
             "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
             "integrity": "sha512-p4a9I6X6nu6IhoGmBqAcbJy1mlC4j27vEPZX9F4L4/vZT3Lyq1VkFHw/V/PUcB9Buo+DG3iHkT0x3Qya58zc3g==",
+            "dev": true,
             "dependencies": {
                 "buffer-crc32": "~0.2.3",
                 "fd-slicer": "~1.1.0"
@@ -16753,23 +16425,6 @@
             "funding": {
                 "url": "https://github.com/sponsors/sindresorhus"
             }
-        },
-        "node_modules/zookeeper": {
-            "version": "6.0.0",
-            "resolved": "https://registry.npmjs.org/zookeeper/-/zookeeper-6.0.0.tgz",
-            "integrity": "sha512-Z35PpQ8aKmkKaGwtMHRJecobeNXDMIQiH3wkJYe7/Zn8Cps9SFd+gc/r24YXzb5y02IDBa7tkZKnekRZgx9tGA==",
-            "hasInstallScript": true,
-            "dependencies": {
-                "async": "3.2.x",
-                "decompress": "4.2.x",
-                "decompress-targz": "4.1.x",
-                "nan": "2.x",
-                "node-gyp-build": "^4.2.3",
-                "shelljs": "0.8.x"
-            },
-            "engines": {
-                "node": ">=14.15.4"
-            }
         }
     }
 }

package.json

@@ -143,8 +143,7 @@
         "tcp-ping": "~0.1.1",
         "thirty-two": "~1.0.2",
         "tough-cookie": "~4.1.3",
-        "ws": "^8.13.0",
+        "ws": "^8.13.0"
-        "zookeeper": "^6.0.0"
     },
     "devDependencies": {
         "@actions/github": "~5.0.1",

server/util-server.js

@@ -23,7 +23,7 @@ const radiusClient = require("node-radius-client");
 const redis = require("redis");
 const oidc = require("openid-client");
 const tls = require("tls");
-const ZooKeeper = require("zookeeper");
+const net = require("node:net");
 
 const {
     dictionaries: {
@@ -1167,38 +1167,48 @@ module.exports.axiosAbortSignal = (timeoutMs) => {
 };
 
 /**
- * Attempt to connect to the given zookeeper host under the given timeout.
+ * Connects to zookeeper host and sends "ruok", if response is "imok", then host is UP.
  * @param {string} zookeeperHost - The connection string for a single host in the form 'host:port'
  * @param {number} timeoutMs - Timeout in milliseconds under which connection must be established.
- * @returns {Promise<any>} The result of connection attempt
+ * @returns {Promise<any>} The result of connection check
  */
 exports.zookeeperConnect = function (zookeeperHost, timeoutMs = 5000) {
+    const hostPort = zookeeperHost.split(":");
+    const host = hostPort.shift();
+    const port = hostPort.shift();
+
     return new Promise((resolve, reject) => {
-        // Seems like zookeeper client behavior is to retry indefitiely on timeout.
+        let socket = net.connect({
-        // So, an explicit timer is needed to prevent the monitor from getting stuck.
+            host: host,
-        const timer = setTimeout(() => {
+            port: port,
-            reject(Error("Zookeeper operation timed out"));
+            timeout: timeoutMs,
-        }, timeoutMs);
+            onread: {
-
+                buffer: Buffer.alloc(1 * 1024), // 1KB fixed to cap very large response
-        const config = {
+                callback: function (nread, buf) {
-            connect: zookeeperHost,
+                    let response = buf.toString("utf8", 0, nread);
-            timeout: timeoutMs, // Causes the client to retry and does not fail.
+                    log.debug("zookeeper", `got response: [${response}]`);
-            debug_level: ZooKeeper.ZOO_LOG_LEVEL_WARN,
+                    if (response === "imok") {
-            host_order_deterministic: false,
+                        resolve("imok");
-        };
-
-        const client = new ZooKeeper(config);
-
-        client.connect(config, (err, _) => {
-            if (err) {
-                clearTimeout(timer);
-                reject(err);
                     } else {
-                clearTimeout(timer);
+                        reject(Error("zookeeper did not respond with imok"));
-                resolve("Successfully connected");
                     }
+                },
+            },
+        });
 
-            client.close();
+        socket.once("error", function (err) {
+            log.debug("zookeeper", `error connecting to zookeeper [${err.message}]`);
+            reject(err);
+        });
+
+        socket.on("connect", function () {
+            log.debug("zookeeper", `connected to zookeeper: ${host}:${port}`);
+            socket.write(`ruok\n`, (err) => {
+                if (err) {
+                    log.debug("zookeeper", `error while writing to host [${err.message}]`);
+                    reject(err);
+                }
+            });
         });
     });
 };