github.com/looshlee/beatles@v0.0.0-20220727174639-742810ab631c/pkg/node/nodename.go (about)

     1  // Copyright 2016-2017 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package node
    16  
    17  import (
    18  	"os"
    19  
    20  	"github.com/cilium/cilium/pkg/logging/logfields"
    21  )
    22  
    23  var (
    24  	nodeName = "localhost"
    25  )
    26  
    27  // SetName sets the name of the local node. This will overwrite the value that
    28  // is automatically retrieved with `os.Hostname()`.
    29  //
    30  // Note: This function is currently designed to only be called during the
    31  // bootstrapping procedure of the agent where no parallelism exists. If you
    32  // want to use this function in later stages, a mutex must be added first.
    33  func SetName(name string) {
    34  	nodeName = name
    35  }
    36  
    37  // GetName returns the name of the local node. The value returned was either
    38  // previously set with SetName(), retrieved via `os.Hostname()`, or as a last
    39  // resort is hardcoded to "localhost".
    40  func GetName() string {
    41  	return nodeName
    42  }
    43  
    44  func init() {
    45  	if h, err := os.Hostname(); err != nil {
    46  		log.WithError(err).Warn("Unable to retrieve local hostname")
    47  	} else {
    48  		log.WithField(logfields.NodeName, h).Debug("os.Hostname() returned")
    49  		nodeName = h
    50  	}
    51  }