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         // collect all initial values on startup / reset
  79         state.fsbi.Collect(state.dbh)
  80         state.tlwsbt.Collect(state.dbh)
  81         state.tiwsbt.Collect(state.dbh)
  82
  83         state.UpdateInitialValues()
  84 }
  85
  86 func (state *State) UpdateInitialValues() {
  87         start := time.Now()
  88         state.fsbi.UpdateInitialValues()
  89         state.tlwsbt.UpdateInitialValues()
  90         state.tiwsbt.UpdateInitialValues()
  91         lib.Logger.Println("state.UpdateInitialValues() took", time.Duration(time.Since(start)).String())
  92 }
  93
  94 // Only collect the data we are looking at.
  95 func (state *State) Collect() {
  96         start := time.Now()
  97
  98         switch state.show {
  99         case showLatency, showOps:
 100                 state.tiwsbt.Collect(state.dbh)
 101         case showIO:
 102                 state.fsbi.Collect(state.dbh)
 103         case showLocks:
 104                 state.tlwsbt.Collect(state.dbh)
 105         }
 106         lib.Logger.Println("state.Collect() took", time.Duration(time.Since(start)).String())
 107 }
 108
 109 func (state State) MySQLVersion() string {
 110         return state.mysql_version
 111 }
 112
 113 func (state State) Datadir() string {
 114         return state.datadir
 115 }
 116
 117 func (state *State) SetHelp(newHelp bool) {
 118         state.help = newHelp
 119
 120         state.screen.Clear()
 121         state.screen.Flush()
 122 }
 123
 124 func (state *State) SetDatadir(datadir string) {
 125         state.datadir = datadir
 126 }
 127
 128 func (state *State) SetMySQLVersion(mysql_version string) {
 129         state.mysql_version = mysql_version
 130 }
 131
 132 func (state *State) SetHostname(hostname string) {
 133         state.hostname = hostname
 134 }
 135
 136 func (state State) Help() bool {
 137         return state.help
 138 }
 139
 140 // display the output according to the mode we are in
 141 func (state *State) Display() {
 142         if state.help {
 143                 state.screen.DisplayHelp()
 144         } else {
 145                 state.displayHeading()
 146                 switch state.show {
 147                 case showLatency, showOps:
 148                         state.displayOpsOrLatency()
 149                 case showIO:
 150                         state.displayIO()
 151                 case showLocks:
 152                         state.displayLocks()
 153                 }
 154         }
 155 }
 156
 157 // change to the next display mode
 158 func (state *State) DisplayNext() {
 159         if state.show == showLocks {
 160                 state.show = showLatency
 161         } else {
 162                 state.show++
 163         }
 164         // this needs to be done more cleanly
 165         if state.show == showLatency {
 166                 state.tiwsbt.SetWantsLatency(true)
 167         }
 168         if state.show == showOps {
 169                 state.tiwsbt.SetWantsLatency(false)
 170         }
 171         state.screen.Clear()
 172         state.screen.Flush()
 173 }
 174
 175 func (state State) displayHeading() {
 176         state.displayLine0()
 177         state.displayLine1()
 178 }
 179
 180 func (state State) displayLine0() {
 181         _, uptime := lib.SelectGlobalStatusByVariableName(state.dbh, "UPTIME")
 182         top_line := lib.MyName() + " " + version.Version() + " - " + now_hhmmss() + " " + state.hostname + " / " + state.mysql_version + ", up " + fmt.Sprintf("%-16s", lib.Uptime(uptime))
 183         if state.want_relative_stats {
 184                 now := time.Now()
 185
 186                 var initial time.Time
 187
 188                 switch state.show {
 189                 case showLatency, showOps:
 190                         initial = state.tiwsbt.Last()
 191                 case showIO:
 192                         initial = state.fsbi.Last()
 193                 case showLocks:
 194                         initial = state.tlwsbt.Last()
 195                 default:
 196                         initial = time.Now() // THIS IS WRONG !!!
 197                 }
 198
 199                 d := now.Sub(initial)
 200
 201                 top_line = top_line + " [REL] " + fmt.Sprintf("%.0f seconds", d.Seconds())
 202         } else {
 203                 top_line = top_line + " [ABS]             "
 204         }
 205         state.screen.PrintAt(0, 0, top_line)
 206 }
 207
 208 func (state State) displayLine1() {
 209         switch state.show {
 210         case showLatency, showOps:
 211                 state.screen.PrintAt(0, 1, state.tiwsbt.Description())
 212         case showIO:
 213                 state.screen.PrintAt(0, 1, state.fsbi.Description())
 214         case showLocks:
 215                 state.screen.PrintAt(0, 1, state.tlwsbt.Description())
 216         default:
 217                 state.screen.PrintAt(0, 1, "UNKNOWN")
 218         }
 219 }
 220
 221 func (state *State) displayOpsOrLatency() {
 222         state.screen.PrintAt(0, 2, state.tiwsbt.Headings())
 223
 224         max_rows := state.screen.Height() - 3
 225         row_content := state.tiwsbt.RowContent(max_rows)
 226
 227         // print out rows
 228         for k := range row_content {
 229                 y := 3 + k
 230                 state.screen.PrintAt(0, y, row_content[k])
 231         }
 232         // print out empty rows
 233         for k := len(row_content); k < (state.screen.Height() - 3); k++ {
 234                 y := 3 + k
 235                 if y < state.screen.Height()-1 {
 236                         state.screen.PrintAt(0, y, state.tiwsbt.EmptyRowContent())
 237                 }
 238         }
 239
 240         // print out the totals at the bottom
 241         state.screen.PrintAt(0, state.screen.Height()-1, state.tiwsbt.TotalRowContent())
 242 }
 243
 244 // show actual I/O latency values
 245 func (state State) displayIO() {
 246         state.screen.PrintAt(0, 2, state.fsbi.Headings())
 247
 248         // print out the data
 249         max_rows := state.screen.Height() - 3
 250         row_content := state.fsbi.RowContent(max_rows)
 251
 252         // print out rows
 253         for k := range row_content {
 254                 y := 3 + k
 255                 state.screen.PrintAt(0, y, row_content[k])
 256         }
 257         // print out empty rows
 258         for k := len(row_content); k < (state.screen.Height() - 3); k++ {
 259                 y := 3 + k
 260                 if y < state.screen.Height()-1 {
 261                         state.screen.PrintAt(0, y, state.fsbi.EmptyRowContent())
 262                 }
 263         }
 264
 265         // print out the totals at the bottom
 266         state.screen.PrintAt(0, state.screen.Height()-1, state.fsbi.TotalRowContent())
 267 }
 268
 269 func (state *State) displayLocks() {
 270         state.screen.PrintAt(0, 2, state.tlwsbt.Headings())
 271
 272         // print out the data
 273         max_rows := state.screen.Height() - 3
 274         row_content := state.tlwsbt.RowContent(max_rows)
 275
 276         // print out rows
 277         for k := range row_content {
 278                 y := 3 + k
 279                 state.screen.PrintAt(0, y, row_content[k])
 280         }
 281         // print out empty rows
 282         for k := len(row_content); k < (state.screen.Height() - 3); k++ {
 283                 y := 3 + k
 284                 if y < state.screen.Height()-1 {
 285                         state.screen.PrintAt(0, y, state.tlwsbt.EmptyRowContent())
 286                 }
 287         }
 288
 289         // print out the totals at the bottom
 290         state.screen.PrintAt(0, state.screen.Height()-1, state.tlwsbt.TotalRowContent())
 291 }
 292
 293 // do we want to show all p_s data?
 294 func (state State) WantRelativeStats() bool {
 295         return state.want_relative_stats
 296 }
 297
 298 // set if we want data from when we started/reset stats.
 299 func (state *State) SetWantRelativeStats(want_relative_stats bool) {
 300         state.want_relative_stats = want_relative_stats
 301
 302         state.fsbi.SetWantRelativeStats(want_relative_stats)
 303         state.tlwsbt.SetWantRelativeStats(state.want_relative_stats)
 304         state.tiwsbt.SetWantRelativeStats(state.want_relative_stats)
 305
 306         state.Display()
 307 }
 308
 309 // if there's a better way of doing this do it better ...
 310 func now_hhmmss() string {
 311         t := time.Now()
 312         return fmt.Sprintf("%2d:%02d:%02d", t.Hour(), t.Minute(), t.Second())
 313 }
 314
 315 // record the latest screen size
 316 func (state *State) ScreenSetSize(width, height int) {
 317         state.screen.SetSize(width, height)
 318 }
 319
 320 // clean up screen and disconnect database
 321 func (state *State) Cleanup() {
 322         state.screen.Close()
 323         if state.dbh != nil {
 324                 _ = state.dbh.Close()
 325         }
 326 }