fix: unregister timer when snowflake etcd keepalive failed (#8556)

Fixes #8520

apisix/plugins/request-id.lua

@@ -129,6 +129,7 @@ local function gen_data_machine(max_number)
                     if err4 then
                         snowflake_inited = nil
                         data_machine = nil
+                        timers.unregister_timer("plugin#request-id")
                         core.log.error("snowflake data_machine: " .. id .." lease failed.")
                     end
                     start_at = now

t/plugin/request-id-reload-bugfix.t

@@ -0,0 +1,117 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+use t::APISIX 'no_plan';
+
+log_level('warn');
+repeat_each(1);
+no_long_string();
+no_root_location();
+
+add_block_preprocessor(sub {
+    my ($block) = @_;
+
+    if (!$block->request) {
+        $block->set_value("request", "GET /t");
+    }
+
+    my $extra_init_by_lua = <<_EOC_;
+    local core = require("apisix.core")
+    local orig_new = core.etcd.new
+    core.etcd.new = function(...)
+        local cli, prefix = orig_new(...)
+        cli.keepalive = function(...)
+            return false, "test error"
+        end
+        -- only simulate error once
+        -- because reload would redo init()
+        core.etcd.new = orig_new
+        return cli, prefix
+    end
+
+    local timers = require("apisix.timers")
+    local orig_unregister = timers.unregister_timer
+    unregister_cnt = 0
+    timers.unregister_timer = function(name, privileged)
+        core.log.error("unregister timer: ", name)
+        unregister_cnt = unregister_cnt + 1
+        return orig_unregister(name, privileged)
+    end
+_EOC_
+
+    $block->set_value("extra_init_by_lua", $extra_init_by_lua);
+});
+
+run_tests;
+
+__DATA__
+
+=== TEST 1: unregister timer when etcd keepalive failed
+--- yaml_config
+plugins:
+    - request-id
+plugin_attr:
+    request-id:
+        snowflake:
+            enable: true
+            data_machine_interval: 1
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/routes/1',
+                 ngx.HTTP_PUT,
+                 [[{
+                        "plugins": {
+                            "request-id": {
+                                "algorithm": "snowflake"
+                            }
+                        },
+                        "upstream": {
+                            "nodes": {
+                                "127.0.0.1:1982": 1
+                            },
+                            "type": "roundrobin"
+                        },
+                        "uri": "/opentracing"
+                }]]
+                )
+            if code >= 300 then
+                ngx.status = code
+                return
+            end
+
+            -- wait for keepalive fails
+            ngx.sleep(2)
+
+            local code = t('/apisix/admin/plugins/reload',
+                ngx.HTTP_PUT)
+            if code >= 300 then
+                ngx.status = code
+                return
+            end
+
+            ngx.sleep(2)
+            ngx.log(ngx.ERR, unregister_cnt)
+            if unregister_cnt ~= 1 then
+                ngx.status = 500
+            end
+        }
+    }
+--- timeout: 5
+--- error_log
+lease failed
+unregister timer: plugin#request-id