github.com/hellobchain/third_party@v0.0.0-20230331131523-deb0478a2e52/prometheus/procfs/fs.go (about)

     1  // Copyright 2018 The Prometheus Authors
     2  // Licensed under the Apache License, Version 2.0 (the "License");
     3  // you may not use this file except in compliance with the License.
     4  // You may obtain a copy of the License at
     5  //
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package procfs
    15  
    16  import (
    17  	"fmt"
    18  	"os"
    19  	"path"
    20  
    21  	"github.com/hellobchain/third_party/prometheus/procfs/nfs"
    22  	"github.com/hellobchain/third_party/prometheus/procfs/xfs"
    23  )
    24  
    25  // FS represents the pseudo-filesystem proc, which provides an interface to
    26  // kernel data structures.
    27  type FS string
    28  
    29  // DefaultMountPoint is the common mount point of the proc filesystem.
    30  const DefaultMountPoint = "/proc"
    31  
    32  // NewFS returns a new FS mounted under the given mountPoint. It will error
    33  // if the mount point can't be read.
    34  func NewFS(mountPoint string) (FS, error) {
    35  	info, err := os.Stat(mountPoint)
    36  	if err != nil {
    37  		return "", fmt.Errorf("could not read %s: %s", mountPoint, err)
    38  	}
    39  	if !info.IsDir() {
    40  		return "", fmt.Errorf("mount point %s is not a directory", mountPoint)
    41  	}
    42  
    43  	return FS(mountPoint), nil
    44  }
    45  
    46  // Path returns the path of the given subsystem relative to the procfs root.
    47  func (fs FS) Path(p ...string) string {
    48  	return path.Join(append([]string{string(fs)}, p...)...)
    49  }
    50  
    51  // XFSStats retrieves XFS filesystem runtime statistics.
    52  func (fs FS) XFSStats() (*xfs.Stats, error) {
    53  	f, err := os.Open(fs.Path("fs/xfs/stat"))
    54  	if err != nil {
    55  		return nil, err
    56  	}
    57  	defer f.Close()
    58  
    59  	return xfs.ParseStats(f)
    60  }
    61  
    62  // NFSClientRPCStats retrieves NFS client RPC statistics.
    63  func (fs FS) NFSClientRPCStats() (*nfs.ClientRPCStats, error) {
    64  	f, err := os.Open(fs.Path("net/rpc/nfs"))
    65  	if err != nil {
    66  		return nil, err
    67  	}
    68  	defer f.Close()
    69  
    70  	return nfs.ParseClientRPCStats(f)
    71  }
    72  
    73  // NFSdServerRPCStats retrieves NFS daemon RPC statistics.
    74  func (fs FS) NFSdServerRPCStats() (*nfs.ServerRPCStats, error) {
    75  	f, err := os.Open(fs.Path("net/rpc/nfsd"))
    76  	if err != nil {
    77  		return nil, err
    78  	}
    79  	defer f.Close()
    80  
    81  	return nfs.ParseServerRPCStats(f)
    82  }