// Copyright 2018 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 nfsd implements parsing of /proc/net/rpc/nfsd.
// Fields are documented in https://www.svennd.be/nfsd-stats-explained-procnetrpcnfsd/
package nfsd

// ReplyCache models the "rc" line.
type ReplyCache struct {
	Hits    uint64
	Misses  uint64
	NoCache uint64
}

// FileHandles models the "fh" line.
type FileHandles struct {
	Stale        uint64
	TotalLookups uint64
	AnonLookups  uint64
	DirNoCache   uint64
	NoDirNoCache uint64
}

// InputOutput models the "io" line.
type InputOutput struct {
	Read  uint64
	Write uint64
}

// Threads models the "th" line.
type Threads struct {
	Threads uint64
	FullCnt uint64
}

// ReadAheadCache models the "ra" line.
type ReadAheadCache struct {
	CacheSize      uint64
	CacheHistogram []uint64
	NotFound       uint64
}

// Network models the "net" line.
type Network struct {
	NetCount   uint64
	UDPCount   uint64
	TCPCount   uint64
	TCPConnect uint64
}

// RPC models the "rpc" line.
type RPC struct {
	RPCCount uint64
	BadCnt   uint64
	BadFmt   uint64
	BadAuth  uint64
	BadcInt  uint64
}

// V2Stats models the "proc2" line.
type V2Stats struct {
	Null     uint64
	GetAttr  uint64
	SetAttr  uint64
	Root     uint64
	Lookup   uint64
	ReadLink uint64
	Read     uint64
	WrCache  uint64
	Write    uint64
	Create   uint64
	Remove   uint64
	Rename   uint64
	Link     uint64
	SymLink  uint64
	MkDir    uint64
	RmDir    uint64
	ReadDir  uint64
	FsStat   uint64
}

// V3Stats models the "proc3" line.
type V3Stats struct {
	Null        uint64
	GetAttr     uint64
	SetAttr     uint64
	Lookup      uint64
	Access      uint64
	ReadLink    uint64
	Read        uint64
	Write       uint64
	Create      uint64
	MkDir       uint64
	SymLink     uint64
	MkNod       uint64
	Remove      uint64
	RmDir       uint64
	Rename      uint64
	Link        uint64
	ReadDir     uint64
	ReadDirPlus uint64
	FsStat      uint64
	FsInfo      uint64
	PathConf    uint64
	Commit      uint64
}

// V4Stats models the "proc4" line.
type V4Stats struct {
	Null     uint64
	Compound uint64
}

// V4Ops models the "proc4ops" line: NFSv4 operations
// Variable list, see:
// v4.0 https://tools.ietf.org/html/rfc3010 (38 operations)
// v4.1 https://tools.ietf.org/html/rfc5661 (58 operations)
// v4.2 https://tools.ietf.org/html/draft-ietf-nfsv4-minorversion2-41 (71 operations)
type V4Ops struct {
	//Values       uint64 // Variable depending on v4.x sub-version. TODO: Will this always at least include the fields in this struct?
	Op0Unused    uint64
	Op1Unused    uint64
	Op2Future    uint64
	Access       uint64
	Close        uint64
	Commit       uint64
	Create       uint64
	DelegPurge   uint64
	DelegReturn  uint64
	GetAttr      uint64
	GetFH        uint64
	Link         uint64
	Lock         uint64
	Lockt        uint64
	Locku        uint64
	Lookup       uint64
	LookupRoot   uint64
	Nverify      uint64
	Open         uint64
	OpenAttr     uint64
	OpenConfirm  uint64
	OpenDgrd     uint64
	PutFH        uint64
	PutPubFH     uint64
	PutRootFH    uint64
	Read         uint64
	ReadDir      uint64
	ReadLink     uint64
	Remove       uint64
	Rename       uint64
	Renew        uint64
	RestoreFH    uint64
	SaveFH       uint64
	SecInfo      uint64
	SetAttr      uint64
	Verify       uint64
	Write        uint64
	RelLockOwner uint64
}

// RPCStats models all stats from /proc/net/rpc/nfsd.
type RPCStats struct {
	ReplyCache     ReplyCache
	FileHandles    FileHandles
	InputOutput    InputOutput
	Threads        Threads
	ReadAheadCache ReadAheadCache
	Network        Network
	RPC            RPC
	V2Stats        V2Stats
	V3Stats        V3Stats
	V4Stats        V4Stats
	V4Ops          V4Ops
}