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// Copyright 2019 The Prometheus Authors
//
// Licensed 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.
package iscsi
import (
"path/filepath"
"strings"
"github.com/prometheus/procfs/internal/fs"
)
// iscsi target started with /sys/kernel/config/target/iscsi/iqn*
// configfs + target/iscsi/iqn*
// iqnGlob is representing all the possible IQN.
const iqnGlob = "target/iscsi/iqn*"
// targetCore static path /sys/kernel/config/target/core for node_exporter
// reading runtime status.
const targetCore = "target/core"
// devicePath static path /sys/devices/rbd/[0-9]* for rbd devices to
// read at runtime status.
const devicePath = "devices/rbd"
// FS represents the pseudo-filesystem configfs, which provides an interface to
// iscsi kernel data structures in sysfs as /sys and configfs as /sys/kernel/config.
type FS struct {
sysfs *fs.FS
configfs *fs.FS
}
// NewFS returns a new configfs mounted under the given mount point. It will
// error and return empty FS if the mount point can't be read. For the ease of
// use, an empty string parameter configfsMountPoint will call internal fs for
// the default sys path as /sys/kernel/config.
func NewFS(sysfsPath string, configfsMountPoint string) (FS, error) {
if strings.TrimSpace(sysfsPath) == "" {
sysfsPath = fs.DefaultSysMountPoint
}
sysfs, err := fs.NewFS(sysfsPath)
if err != nil {
return FS{}, err
}
if strings.TrimSpace(configfsMountPoint) == "" {
configfsMountPoint = fs.DefaultConfigfsMountPoint
}
configfs, err := fs.NewFS(configfsMountPoint)
if err != nil {
return FS{}, err
}
return FS{&sysfs, &configfs}, nil
}
// Path is a helper function to get configfs path.
func (fs FS) Path(p ...string) string {
return fs.configfs.Path(p...)
}
// ISCSIStats getting iscsi runtime information.
func (fs FS) ISCSIStats() ([]*Stats, error) {
matches, err := filepath.Glob(fs.configfs.Path(iqnGlob))
if err != nil {
return nil, err
}
stats := make([]*Stats, 0, len(matches))
for _, iqnPath := range matches {
// stats
s, err := GetStats(iqnPath)
if err != nil {
return nil, err
}
stats = append(stats, s)
}
return stats, nil
}
// TPGT struct for sys target portal group tag info.
type TPGT struct {
Name string // name of the tpgt group
TpgtPath string // file path of tpgt
IsEnable bool // is the tpgt enable
Luns []LUN // the Luns that tpgt has
}
// LUN struct for sys logical unit number info.
type LUN struct {
Name string // name of the lun
LunPath string // file path of the lun
Backstore string // backstore of the lun
ObjectName string // place holder for object
TypeNumber string // place holder for number of the device
}
// FILEIO struct for backstore info.
type FILEIO struct {
Name string // name of the fileio
Fnumber string // number related to the backstore
ObjectName string // place holder for object in iscsi object
Filename string // link to the actual file being export
}
// IBLOCK struct for backstore info.
type IBLOCK struct {
Name string // name of the iblock
Bnumber string // number related to the backstore
ObjectName string // place holder for object in iscsi object
Iblock string // link to the actual block being export
}
// RBD struct for backstore info.
type RBD struct {
Name string // name of the rbd
Rnumber string // number related to the backstore
Pool string // place holder for the rbd pool
Image string // place holder for the rbd image
}
// RDMCP struct for backstore info.
type RDMCP struct {
Name string // name of the rdm_cp
ObjectName string // place holder for object name
}
// Stats struct for all targets info.
type Stats struct {
Name string
Tpgt []TPGT
RootPath string
}