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