state/state.go

   1 // lib - library routines for pstop.
   2 //
   3 // this file contains the library routines related to the stored state in pstop.
   4 package state
   5
   6 import (
   7         "database/sql"
   8         "fmt"
   9         "time"
  10
  11         "github.com/sjmudd/pstop/lib"
  12         fsbi "github.com/sjmudd/pstop/performance_schema/file_summary_by_instance"
  13         "github.com/sjmudd/pstop/performance_schema/ps_table"
  14         tiwsbt "github.com/sjmudd/pstop/performance_schema/table_io_waits_summary_by_table"
  15         tlwsbt "github.com/sjmudd/pstop/performance_schema/table_lock_waits_summary_by_table"
  16         "github.com/sjmudd/pstop/screen"
  17         "github.com/sjmudd/pstop/version"
  18 )
  19
  20 // what information to show
  21 type Show int
  22
  23 const (
  24         showLatency = iota
  25         showOps     = iota
  26         showIO      = iota
  27         showLocks   = iota
  28 )
  29
  30 type State struct {
  31         datadir             string
  32         dbh                 *sql.DB
  33         help                bool
  34         hostname            string
  35         fsbi                ps_table.Tabler // ufsbi.File_summary_by_instance
  36         tiwsbt              tiwsbt.Table_io_waits_summary_by_table
  37         tlwsbt              ps_table.Tabler // tlwsbt.Table_lock_waits_summary_by_table
  38         screen              screen.TermboxScreen
  39         show                Show
  40         mysql_version       string
  41         want_relative_stats bool
  42 }
  43
  44 func (state *State) Setup(dbh *sql.DB) {
  45         state.dbh = dbh
  46
  47         state.screen.Initialise()
  48
  49         _, variables := lib.SelectAllGlobalVariablesByVariableName(state.dbh)
  50         // setup to their initial types/values
  51         state.fsbi = fsbi.NewFileSummaryByInstance(variables)
  52         state.tlwsbt = new(tlwsbt.Table_lock_waits_summary_by_table)
  53
  54         state.want_relative_stats = true // we show info from the point we start collecting data
  55         state.fsbi.SetWantRelativeStats(state.want_relative_stats)
  56         state.fsbi.SetNow()
  57         state.tlwsbt.SetWantRelativeStats(state.want_relative_stats)
  58         state.tlwsbt.SetNow()
  59         state.tiwsbt.SetWantRelativeStats(state.want_relative_stats)
  60         state.tiwsbt.SetNow()
  61
  62         state.ResetDBStatistics()
  63
  64         state.SetHelp(false)
  65         state.show = showLatency
  66         state.tiwsbt.SetWantsLatency(true)
  67
  68         _, hostname := lib.SelectGlobalVariableByVariableName(state.dbh, "HOSTNAME")
  69         _, mysql_version := lib.SelectGlobalVariableByVariableName(state.dbh, "VERSION")
  70         _, datadir := lib.SelectGlobalVariableByVariableName(state.dbh, "DATADIR")
  71         state.SetHostname(hostname)
  72         state.SetMySQLVersion(mysql_version)
  73         state.SetDatadir(datadir)
  74 }
  75
  76 // do a fresh collection of data and then update the initial values based on that.
  77 func (state *State) ResetDBStatistics() {
  78         state.Collect()
  79         state.UpdateInitialValues()
  80 }
  81
  82 func (state *State) UpdateInitialValues() {
  83         start := time.Now()
  84         state.fsbi.UpdateInitialValues()
  85         state.tlwsbt.UpdateInitialValues()
  86         state.tiwsbt.UpdateInitialValues()
  87         lib.Logger.Println("state.UpdateInitialValues() took", time.Duration(time.Since(start)).String())
  88 }
  89
  90 func (state *State) Collect() {
  91         start := time.Now()
  92         state.fsbi.Collect(state.dbh)
  93         state.tlwsbt.Collect(state.dbh)
  94         state.tiwsbt.Collect(state.dbh)
  95         lib.Logger.Println("state.Collect() took", time.Duration(time.Since(start)).String())
  96 }
  97
  98 func (state State) MySQLVersion() string {
  99         return state.mysql_version
 100 }
 101
 102 func (state State) Datadir() string {
 103         return state.datadir
 104 }
 105
 106 func (state *State) SetHelp(newHelp bool) {
 107         state.help = newHelp
 108
 109         state.screen.Clear()
 110         state.screen.Flush()
 111 }
 112
 113 func (state *State) SetDatadir(datadir string) {
 114         state.datadir = datadir
 115 }
 116
 117 func (state *State) SetMySQLVersion(mysql_version string) {
 118         state.mysql_version = mysql_version
 119 }
 120
 121 func (state *State) SetHostname(hostname string) {
 122         state.hostname = hostname
 123 }
 124
 125 func (state State) Help() bool {
 126         return state.help
 127 }
 128
 129 // display the output according to the mode we are in
 130 func (state *State) Display() {
 131         if state.help {
 132                 state.screen.DisplayHelp()
 133         } else {
 134                 state.displayHeading()
 135                 switch state.show {
 136                 case showLatency, showOps:
 137                         state.displayOpsOrLatency()
 138                 case showIO:
 139                         state.displayIO()
 140                 case showLocks:
 141                         state.displayLocks()
 142                 }
 143         }
 144 }
 145
 146 // change to the next display mode
 147 func (state *State) DisplayNext() {
 148         if state.show == showLocks {
 149                 state.show = showLatency
 150         } else {
 151                 state.show++
 152         }
 153         // this needs to be done more cleanly
 154         if state.show == showLatency {
 155                 state.tiwsbt.SetWantsLatency(true)
 156         }
 157         if state.show == showOps {
 158                 state.tiwsbt.SetWantsLatency(false)
 159         }
 160         state.screen.Clear()
 161         state.screen.Flush()
 162 }
 163
 164 func (state State) displayHeading() {
 165         state.displayLine0()
 166         state.displayLine1()
 167 }
 168
 169 func (state State) displayLine0() {
 170         _, uptime := lib.SelectGlobalStatusByVariableName(state.dbh, "UPTIME")
 171         top_line := lib.MyName() + " " + version.Version() + " - " + now_hhmmss() + " " + state.hostname + " / " + state.mysql_version + ", up " + fmt.Sprintf("%-16s", lib.Uptime(uptime))
 172         if state.want_relative_stats {
 173                 now := time.Now()
 174
 175                 var initial time.Time
 176
 177                 switch state.show {
 178                 case showLatency, showOps:
 179                         initial = state.tiwsbt.Last()
 180                 case showIO:
 181                         initial = state.fsbi.Last()
 182                 case showLocks:
 183                         initial = state.tlwsbt.Last()
 184                 default:
 185                         initial = time.Now() // THIS IS WRONG !!!
 186                 }
 187
 188                 d := now.Sub(initial)
 189
 190                 top_line = top_line + " [REL] " + fmt.Sprintf("%.0f seconds", d.Seconds())
 191         } else {
 192                 top_line = top_line + " [ABS]             "
 193         }
 194         state.screen.PrintAt(0, 0, top_line)
 195 }
 196
 197 func (state State) displayLine1() {
 198         switch state.show {
 199         case showLatency, showOps:
 200                 state.screen.PrintAt(0, 1, state.tiwsbt.Description())
 201         case showIO:
 202                 state.screen.PrintAt(0, 1, state.fsbi.Description())
 203         case showLocks:
 204                 state.screen.PrintAt(0, 1, state.tlwsbt.Description())
 205         default:
 206                 state.screen.PrintAt(0, 1, "UNKNOWN")
 207         }
 208 }
 209
 210 func (state *State) displayOpsOrLatency() {
 211         state.screen.PrintAt(0, 2, state.tiwsbt.Headings())
 212
 213         max_rows := state.screen.Height() - 3
 214         row_content := state.tiwsbt.RowContent(max_rows)
 215
 216         // print out rows
 217         for k := range row_content {
 218                 y := 3 + k
 219                 state.screen.PrintAt(0, y, row_content[k])
 220         }
 221         // print out empty rows
 222         for k := len(row_content); k < (state.screen.Height() - 3); k++ {
 223                 y := 3 + k
 224                 if y < state.screen.Height()-1 {
 225                         state.screen.PrintAt(0, y, state.tiwsbt.EmptyRowContent())
 226                 }
 227         }
 228
 229         // print out the totals at the bottom
 230         state.screen.PrintAt(0, state.screen.Height()-1, state.tiwsbt.TotalRowContent())
 231 }
 232
 233 // show actual I/O latency values
 234 func (state State) displayIO() {
 235         state.screen.PrintAt(0, 2, state.fsbi.Headings())
 236
 237         // print out the data
 238         max_rows := state.screen.Height() - 3
 239         row_content := state.fsbi.RowContent(max_rows)
 240
 241         // print out rows
 242         for k := range row_content {
 243                 y := 3 + k
 244                 state.screen.PrintAt(0, y, row_content[k])
 245         }
 246         // print out empty rows
 247         for k := len(row_content); k < (state.screen.Height() - 3); k++ {
 248                 y := 3 + k
 249                 if y < state.screen.Height()-1 {
 250                         state.screen.PrintAt(0, y, state.fsbi.EmptyRowContent())
 251                 }
 252         }
 253
 254         // print out the totals at the bottom
 255         state.screen.PrintAt(0, state.screen.Height()-1, state.fsbi.TotalRowContent())
 256 }
 257
 258 func (state *State) displayLocks() {
 259         state.screen.PrintAt(0, 2, state.tlwsbt.Headings())
 260
 261         // print out the data
 262         max_rows := state.screen.Height() - 3
 263         row_content := state.tlwsbt.RowContent(max_rows)
 264
 265         // print out rows
 266         for k := range row_content {
 267                 y := 3 + k
 268                 state.screen.PrintAt(0, y, row_content[k])
 269         }
 270         // print out empty rows
 271         for k := len(row_content); k < (state.screen.Height() - 3); k++ {
 272                 y := 3 + k
 273                 if y < state.screen.Height()-1 {
 274                         state.screen.PrintAt(0, y, state.tlwsbt.EmptyRowContent())
 275                 }
 276         }
 277
 278         // print out the totals at the bottom
 279         state.screen.PrintAt(0, state.screen.Height()-1, state.tlwsbt.TotalRowContent())
 280 }
 281
 282 // do we want to show all p_s data?
 283 func (state State) WantRelativeStats() bool {
 284         return state.want_relative_stats
 285 }
 286
 287 // set if we want data from when we started/reset stats.
 288 func (state *State) SetWantRelativeStats(want_relative_stats bool) {
 289         state.want_relative_stats = want_relative_stats
 290
 291         state.fsbi.SetWantRelativeStats(want_relative_stats)
 292         state.tlwsbt.SetWantRelativeStats(state.want_relative_stats)
 293         state.tiwsbt.SetWantRelativeStats(state.want_relative_stats)
 294
 295         state.Display()
 296 }
 297
 298 // if there's a better way of doing this do it better ...
 299 func now_hhmmss() string {
 300         t := time.Now()
 301         return fmt.Sprintf("%2d:%02d:%02d", t.Hour(), t.Minute(), t.Second())
 302 }
 303
 304 // record the latest screen size
 305 func (state *State) ScreenSetSize(width, height int) {
 306         state.screen.SetSize(width, height)
 307 }
 308
 309 // clean up screen and disconnect database
 310 func (state *State) Cleanup() {
 311         state.screen.Close()
 312         if state.dbh != nil {
 313                 _ = state.dbh.Close()
 314         }
 315 }