NBSOPSNEBIUS-25: report ExternalEndpointUnexpectedExit on vhost-serve…

…r crashes (#288)

* NBSOPSNEBIUS-25: report ExternalEndpointUnexpectedExit on vhost-server crashes

cloud/blockstore/libs/diagnostics/critical_events.h

@@ -51,6 +51,7 @@ namespace NCloud::NBlockStore {
     xxx(DiskRegistryDeviceNotFoundSoft)                                        \
     xxx(DiskRegistrySourceDiskNotFound)                                        \
     xxx(EndpointSwitchFailure)                                                 \
+    xxx(ExternalEndpointUnexpectedExit)                                        \
     xxx(DiskAgentSessionCacheUpdateError)                                      \
     xxx(DiskAgentSessionCacheRestoreError)                                     \
     xxx(BlockDigestMismatchInBlob)                                             \

cloud/blockstore/libs/endpoints_vhost/external_vhost_server.cpp

@@ -2,6 +2,7 @@
 #include "external_endpoint_stats.h"
 
 #include <cloud/blockstore/libs/common/device_path.h>
+#include <cloud/blockstore/libs/diagnostics/critical_events.h>
 #include <cloud/blockstore/libs/diagnostics/server_stats.h>
 #include <cloud/blockstore/libs/endpoints/endpoint_listener.h>
 
@@ -485,7 +486,10 @@ class TEndpoint final
                 break;
             }
 
-            // TODO: limiter
+            ReportExternalEndpointUnexpectedExit(TStringBuilder()
+                << "External endpoint for a disk " << Stats.DiskId.Quote()
+                << " and a client " << Stats.ClientId.Quote()
+                << " unexpectedly stopped: " << FormatError(error));
 
             auto process = RestartProcess();
             if (!process) {

cloud/blockstore/libs/server/config.cpp

@@ -116,19 +116,15 @@ template <>
 TVector<TString> ConvertValue(
     const google::protobuf::RepeatedPtrField<TString>& value)
 {
-    TVector<TString> v;
-    for (const auto& x : value) {
-        v.push_back(x);
-    }
-    return v;
+    return { value.begin(), value.end() };
 }
 
 template <>
 TVector<TCertificate> ConvertValue(
     const google::protobuf::RepeatedPtrField<NCloud::NProto::TCertificate>& value)
 {
     TVector<TCertificate> v;
-    for (const auto& x : value) {
+    for (const auto& x: value) {
         v.push_back({x.GetCertFile(), x.GetCertPrivateKeyFile()});
     }
     return v;

cloud/blockstore/public/sdk/python/client/base_client.py

@@ -41,6 +41,8 @@
     "execute_action",
     "kick_endpoint",
     "cms_action",
+    "update_disk_registry_config",
+    "describe_disk_registry_config",
 ]
 
 

cloud/blockstore/public/sdk/python/client/safe_client.py

@@ -2,6 +2,8 @@
 
 import cloud.blockstore.public.sdk.python.protos as protos
 
+from google.protobuf.json_format import ParseDict
+
 from .error import _handle_errors
 
 
@@ -901,3 +903,69 @@ def cms_action(
             trace_id,
             request_timeout)
         return response
+
+    @_handle_errors
+    def update_disk_registry_config_async(
+            self,
+            config,
+            idempotence_id=None,
+            timestamp=None,
+            trace_id=None,
+            request_timeout=None):
+
+        request = ParseDict(config, protos.TUpdateDiskRegistryConfigRequest())
+
+        return self.__impl.update_disk_registry_config_async(
+            request,
+            idempotence_id,
+            timestamp,
+            trace_id,
+            request_timeout)
+
+    @_handle_errors
+    def update_disk_registry_config(
+            self,
+            config,
+            idempotence_id=None,
+            timestamp=None,
+            trace_id=None,
+            request_timeout=None):
+
+        request = ParseDict(config, protos.TUpdateDiskRegistryConfigRequest())
+
+        return self.__impl.update_disk_registry_config(
+            request,
+            idempotence_id,
+            timestamp,
+            trace_id,
+            request_timeout)
+
+    @_handle_errors
+    def describe_disk_registry_config_async(
+            self,
+            idempotence_id=None,
+            timestamp=None,
+            trace_id=None,
+            request_timeout=None):
+
+        return self.__impl.describe_disk_registry_config_async(
+            protos.TDescribeDiskRegistryConfigRequest(),
+            idempotence_id,
+            timestamp,
+            trace_id,
+            request_timeout)
+
+    @_handle_errors
+    def describe_disk_registry_config(
+            self,
+            idempotence_id=None,
+            timestamp=None,
+            trace_id=None,
+            request_timeout=None):
+
+        return self.__impl.describe_disk_registry_config(
+            protos.TDescribeDiskRegistryConfigRequest(),
+            idempotence_id,
+            timestamp,
+            trace_id,
+            request_timeout)

cloud/blockstore/tests/external_endpoint/test.py

@@ -0,0 +1,245 @@
+import os
+import pytest
+import requests
+import stat
+import tempfile
+import time
+
+from cloud.blockstore.public.sdk.python.client import CreateClient, \
+    ClientError
+from cloud.blockstore.public.sdk.python.protos import TCmsActionRequest, \
+    TAction, STORAGE_MEDIA_SSD_LOCAL, IPC_VHOST
+
+from cloud.blockstore.tests.python.lib.config import NbsConfigurator, \
+    generate_disk_agent_txt
+from cloud.blockstore.tests.python.lib.daemon import start_ydb, start_nbs, \
+    start_disk_agent, get_fqdn
+
+import yatest.common as yatest_common
+
+from contrib.ydb.tests.library.common.yatest_common import PortManager
+from contrib.ydb.tests.library.harness.kikimr_runner import get_unique_path_for_current_test, \
+    ensure_path_exists
+
+from library.python.retry import retry
+
+
+DEVICE_SIZE = 1024**2
+KNOWN_DEVICE_POOLS = {
+    "KnownDevicePools": [
+        {"Name": "1Mb", "Kind": "DEVICE_POOL_KIND_LOCAL", "AllocationUnit": DEVICE_SIZE},
+    ]}
+
+
+@pytest.fixture(name='data_path')
+def create_data_path():
+
+    p = get_unique_path_for_current_test(
+        output_path=yatest_common.output_path(),
+        sub_folder="data")
+
+    p = os.path.join(p, "dev", "disk", "by-partlabel")
+    ensure_path_exists(p)
+
+    return p
+
+
+@pytest.fixture(autouse=True)
+def create_device_files(data_path):
+
+    for i in range(6):
+        with open(os.path.join(data_path, f"NVMENBS{i + 1:02}"), 'wb') as f:
+            f.seek(DEVICE_SIZE-1)
+            f.write(b'\0')
+            f.flush()
+
+
+@pytest.fixture(name='disk_agent_configurator')
+def create_disk_agent_configurator(ydb, data_path):
+
+    configurator = NbsConfigurator(ydb, 'disk-agent')
+    configurator.generate_default_nbs_configs()
+
+    disk_agent_config = generate_disk_agent_txt(
+        agent_id='',
+        device_erase_method='DEVICE_ERASE_METHOD_NONE',  # speed up tests
+        storage_discovery_config={
+            "PathConfigs": [{
+                "PathRegExp": f"{data_path}/NVMENBS([0-9]+)",
+                "PoolConfigs": [{
+                    "PoolName": "1Mb",
+                    "MinSize": DEVICE_SIZE,
+                    "MaxSize": DEVICE_SIZE
+                }]}]
+            })
+
+    configurator.files["disk-agent"] = disk_agent_config
+
+    return configurator
+
+
+@pytest.fixture(name='ydb')
+def start_ydb_cluster():
+
+    ydb_cluster = start_ydb()
+
+    yield ydb_cluster
+
+    ydb_cluster.stop()
+
+
+@pytest.fixture(name='fake_vhost_server')
+def setup_fake_vhost_server_script():
+
+    class Script:
+
+        def __init__(self, port, path):
+            self.port = port
+            self.path = path
+
+    port = PortManager().get_port()
+    binary_path = yatest_common.binary_path(
+        "cloud/blockstore/tools/testing/fake-vhost-server/fake-vhost-server")
+
+    with tempfile.NamedTemporaryFile(mode='w') as script:
+        script.write("\n".join([
+            "#!/bin/bash",
+            f"exec {binary_path} --port {port} $@"
+        ]))
+
+        os.chmod(script.name, os.stat(script.name).st_mode | stat.S_IXUSR)
+
+        script.file.close()
+
+        yield Script(port, script.name)
+
+
+@pytest.fixture(name='nbs')
+def start_nbs_daemon(ydb, fake_vhost_server):
+
+    cfg = NbsConfigurator(ydb)
+    cfg.generate_default_nbs_configs()
+
+    server = cfg.files["server"].ServerConfig
+    server.VhostEnabled = True
+    server.VhostServerPath = fake_vhost_server.path
+
+    daemon = start_nbs(cfg)
+
+    yield daemon
+
+    daemon.kill()
+
+
+@pytest.fixture(name='disk_agent')
+def start_disk_agent_daemon(ydb, disk_agent_configurator):
+
+    daemon = start_disk_agent(disk_agent_configurator)
+
+    yield daemon
+
+    daemon.kill()
+
+
+@pytest.fixture(autouse=True)
+def setup_env(nbs, disk_agent, data_path):
+
+    client = CreateClient(f"localhost:{nbs.port}")
+    client.execute_action(
+        action="DiskRegistrySetWritableState",
+        input_bytes=str.encode('{"State": true}'))
+
+    client.update_disk_registry_config(KNOWN_DEVICE_POOLS)
+
+    disk_agent.wait_for_registration()
+
+    request = TCmsActionRequest()
+
+    for i in range(2):
+        action = request.Actions.add()
+        action.Type = TAction.ADD_DEVICE
+        action.Host = get_fqdn()
+        action.Device = os.path.join(data_path, f"NVMENBS{i + 1:02}")
+
+    response = client.cms_action(request)
+
+    assert len(response.ActionResults) == 2
+    for r in response.ActionResults:
+        assert r.Result.Code == 0, r
+
+
+def test_external_endpoint(nbs, fake_vhost_server):
+
+    client = CreateClient(f"localhost:{nbs.port}")
+
+    @retry(max_times=10, exception=ClientError)
+    def create_vol0():
+        client.create_volume(
+            disk_id="vol0",
+            block_size=4096,
+            blocks_count=2 * DEVICE_SIZE//4096,
+            storage_media_kind=STORAGE_MEDIA_SSD_LOCAL,
+            storage_pool_name="1Mb")
+
+    vhost_server_url = f"http://localhost:{fake_vhost_server.port}"
+
+    @retry(max_times=10, exception=requests.ConnectionError)
+    def wait_for_vhost_server():
+        r = requests.get(f"{vhost_server_url}/ping").text
+        assert r == "pong"
+
+    create_vol0()
+
+    with tempfile.NamedTemporaryFile() as unix_socket:
+        r = client.start_endpoint(
+            unix_socket_path=unix_socket.name,
+            disk_id="vol0",
+            ipc_type=IPC_VHOST,
+            client_id="test"
+        )
+
+        assert r["Volume"].DiskId == "vol0"
+
+        wait_for_vhost_server()
+
+        r = requests.get(f"{vhost_server_url}/describe").json()
+        devices = r["devices"]
+        assert len(devices) == 2
+
+        for d in devices:
+            assert d[0].find("NVMENBS") != -1
+            assert d[1] == DEVICE_SIZE
+            assert d[2] == 0
+
+        crit = nbs.counters.find({
+            'sensor': 'AppCriticalEvents/ExternalEndpointUnexpectedExit'
+        })
+        assert crit is not None
+        assert crit['value'] == 0
+
+        try:
+            _ = requests.post(f"{vhost_server_url}/terminate", data='{"exit_code": 42}')
+        except requests.ConnectionError:
+            pass
+
+        # wait for the counters to be updated
+        time.sleep(15)
+
+        crit = nbs.counters.find({
+            'sensor': 'AppCriticalEvents/ExternalEndpointUnexpectedExit'
+        })
+        assert crit is not None
+        assert crit['value'] == 1
+
+        wait_for_vhost_server()
+
+        client.stop_endpoint(unix_socket.name)
+
+    # wait for the counters to be updated
+    time.sleep(15)
+
+    crit = nbs.counters.find({
+        'sensor': 'AppCriticalEvents/ExternalEndpointUnexpectedExit'
+    })
+    assert crit is not None
+    assert crit['value'] == 1   # the same value