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dbg.go
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dbg.go
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package runn
import (
"context"
"fmt"
"os"
"sort"
"strconv"
"strings"
"sync"
"github.com/elk-language/go-prompt"
pstrings "github.com/elk-language/go-prompt/strings"
"github.com/k0kubun/pp/v3"
"github.com/olekukonko/tablewriter"
"github.com/samber/lo"
)
const (
dbgCmdNext = "next"
dbgCmdNextShort = "n"
dbgCmdQuit = "quit"
dbgCmdQuitShort = "q"
dbgCmdPrint = "print"
dbgCmdPrintShort = "p"
dbgCmdBreak = "break"
dbgCmdBreakShort = "b"
dbgCmdContinue = "continue"
dbgCmdContinueShort = "c"
dbgCmdInfo = "info"
dbgCmdInfoShort = "i"
dbgCmdList = "list"
dbgCmdListShort = "l"
)
const bpSep = ":"
type breakpoint struct {
runbookID string
stepKey string
}
// dbg is runn debugger.
type dbg struct {
enable bool
showPrompt bool
quit bool
history []string
breakpoints []breakpoint
opn *operatorN
pp *pp.PrettyPrinter
mu sync.Mutex
}
func newDBG(enable bool) *dbg {
return &dbg{
enable: enable,
showPrompt: true,
pp: pp.New(),
}
}
type completer struct {
dbg *dbg
step *step
}
func newCompleter(dbg *dbg, step *step) *completer {
return &completer{
dbg: dbg,
step: step,
}
}
func (c *completer) do(d prompt.Document) ([]prompt.Suggest, pstrings.RuneNumber, pstrings.RuneNumber) {
endIndex := d.CurrentRuneIndex()
w := d.GetWordBeforeCursor()
startIndex := endIndex - pstrings.RuneCount([]byte(w))
cmd := d.Text
splitted := strings.Split(cmd, " ")
var s []prompt.Suggest
switch {
case !strings.Contains(cmd, " "):
s = []prompt.Suggest{
{Text: dbgCmdNext, Description: "(n) run current step and next"},
{Text: dbgCmdQuit, Description: "(q) quit debugger and skip all steps"},
{Text: dbgCmdContinue, Description: "(c) continue to run until next breakpoint"},
{Text: dbgCmdPrint, Description: "(p) print variable. ('print [variable]')"},
{Text: dbgCmdBreak, Description: "(b) set breakpoint. ('break [id]' 'break [id]:[step]' 'break :[step]')"},
{Text: dbgCmdInfo, Description: "(i) show information"},
{Text: dbgCmdList, Description: "(l) list codes of step. ('list' 'list [id]' 'list [id]:[step]' 'list :[step]')"},
}
case splitted[0] == dbgCmdPrint || splitted[0] == dbgCmdPrintShort:
// print
store := c.step.parent.store.toMap()
store[storeRootKeyIncluded] = c.step.parent.included
store[storeRootKeyPrevious] = c.step.parent.store.latest()
keys := storeKeys(store)
for _, k := range keys {
if strings.HasPrefix(k, w) {
s = append(s, prompt.Suggest{Text: k})
}
}
case splitted[0] == dbgCmdBreak || splitted[0] == dbgCmdBreakShort || splitted[0] == dbgCmdList || splitted[0] == dbgCmdListShort:
// break, list
for _, o := range c.dbg.opn.ops {
id := o.ID()[:7]
s = append(s, prompt.Suggest{Text: id})
}
if c.step.idx != len(c.step.parent.steps)-1 {
for i := c.step.idx + 1; i < len(c.step.parent.steps); i++ {
step := c.step.parent.steps[i]
s = append(s, prompt.Suggest{Text: fmt.Sprintf(":%s", step.key)})
}
}
for _, o := range c.dbg.opn.ops {
id := o.ID()[:7]
for _, step := range o.steps {
s = append(s, prompt.Suggest{Text: fmt.Sprintf("%s:%s", id, step.key)})
}
}
case splitted[0] == dbgCmdInfo || splitted[0] == dbgCmdInfoShort:
// info
s = append(s, prompt.Suggest{Text: "breakpoints", Description: "(b) show breakpoints"})
s = append(s, prompt.Suggest{Text: "variables", Description: "(v) show variables"})
}
return prompt.FilterHasPrefix(s, w, true), startIndex, endIndex
}
func (d *dbg) attach(ctx context.Context, s *step) error {
prpt := "> "
if d.quit {
s.parent.skipped = true
return errStepSkiped
}
if !d.enable {
return nil
}
if s != nil {
id := s.parent.ID()
stepKey := s.key
stepIdx := strconv.Itoa(s.idx)
// check breakpoints
for _, bp := range d.breakpoints {
if !strings.HasPrefix(id, bp.runbookID) {
continue
}
if bp.stepKey != stepKey && bp.stepKey != stepIdx {
continue
}
d.showPrompt = true
}
prpt = fmt.Sprintf("%s[%s]> ", id[:7], s.key)
}
if !d.showPrompt {
return nil
}
d.showPrompt = false
L:
for {
in := prompt.Input(
prompt.WithPrefix(prpt),
prompt.WithCompleter(newCompleter(d, s).do),
prompt.WithHistory(d.history),
)
d.history = append(d.history, in)
cmd := strings.SplitN(strings.TrimSpace(in), " ", 2)
prog := cmd[0]
switch prog {
case dbgCmdNext, dbgCmdNextShort:
// next
d.showPrompt = true
break L
case dbgCmdContinue, dbgCmdContinueShort:
// continue
break L
case dbgCmdQuit, dbgCmdQuitShort:
// quit
d.quit = true
s.parent.skipped = true
return errStepSkiped
case dbgCmdPrint, dbgCmdPrintShort:
// print
if len(cmd) != 2 {
_, _ = fmt.Fprintf(os.Stderr, "args required")
continue
}
store := s.parent.store.toMapForDbg()
store[storeRootKeyIncluded] = s.parent.included
store[storeRootKeyPrevious] = s.parent.store.latest()
e, err := Eval(cmd[1], store)
if err != nil {
_, _ = fmt.Fprintf(os.Stderr, "%s\n", err.Error())
continue
}
d.pp.Println(e)
case dbgCmdBreak, dbgCmdBreakShort:
// break
if len(cmd) != 2 {
_, _ = fmt.Fprintf(os.Stderr, "args required")
continue
}
splitted := strings.Split(cmd[1], bpSep)
bp := breakpoint{}
if splitted[0] != "" {
bp.runbookID = splitted[0]
} else {
bp.runbookID = s.parent.ID()
}
if len(splitted) > 1 && splitted[1] != "" {
bp.stepKey = splitted[1]
} else {
bp.stepKey = "0"
}
d.breakpoints = append(d.breakpoints, bp)
case dbgCmdInfo, dbgCmdInfoShort:
// info
if len(cmd) != 2 {
_, _ = fmt.Fprintf(os.Stderr, "args required")
continue
}
switch cmd[1] {
case "breakpoints", "b":
table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"Num", "ID", "Step"})
table.SetAutoWrapText(false)
table.SetHeaderAlignment(tablewriter.ALIGN_LEFT)
table.SetAutoFormatHeaders(false)
table.SetCenterSeparator("")
table.SetColumnSeparator("")
table.SetRowSeparator("-")
table.SetHeaderLine(false)
table.SetBorder(false)
for i, bp := range d.breakpoints {
table.Append([]string{strconv.Itoa(i + 1), bp.runbookID, bp.stepKey})
}
table.Render()
case "variables", "v":
store := s.parent.store.toMapForDbg()
store[storeRootKeyIncluded] = s.parent.included
store[storeRootKeyPrevious] = s.parent.store.latest()
keys := lo.Keys(store)
sort.Strings(keys)
for _, k := range keys {
fmt.Println(k)
}
default:
_, _ = fmt.Fprintf(os.Stderr, "unknown args %s\n", cmd[1])
continue
}
case dbgCmdList, dbgCmdListShort:
// list
var (
path string
idx int
)
if len(cmd) != 2 {
if s == nil {
_, _ = fmt.Fprintf(os.Stderr, "invalid args %s\n", cmd[1])
continue
}
path = s.parent.bookPath
idx = s.idx
} else {
splitted := strings.Split(cmd[1], bpSep)
var (
id string
o *operator
)
if splitted[0] != "" {
id = splitted[0]
} else {
id = s.parent.ID()
}
// search runbook
found := false
for _, op := range d.opn.ops {
if strings.HasPrefix(op.ID(), id) {
if found {
_, _ = fmt.Fprintf(os.Stderr, "unable to identify runbook: %s\n", id)
continue L
}
o = op
found = true
}
}
if !found {
_, _ = fmt.Fprintf(os.Stderr, "runbook not found: %s\n", id)
continue L
}
path = o.bookPath
if len(splitted) > 1 && splitted[1] != "" {
i, err := strconv.Atoi(splitted[1])
if err != nil {
found := false
for _, s := range o.steps {
if s.key == splitted[1] {
found = true
idx = s.idx
}
}
if !found {
_, _ = fmt.Fprintf(os.Stderr, "step not found: %s\n", splitted[1])
continue L
}
} else {
idx = i
}
} else {
idx = 0
}
}
b, err := readFile(path)
if err != nil {
_, _ = fmt.Fprintf(os.Stderr, "%v\n", err)
continue
}
picked, err := pickStepYAML(string(b), idx)
if err != nil {
_, _ = fmt.Fprintf(os.Stderr, "%v\n", err)
continue
}
fmt.Println(picked)
default:
_, _ = fmt.Fprintf(os.Stderr, "unknown command %s\n", in)
}
select {
case <-ctx.Done():
return ctx.Err()
default:
}
}
return nil
}
func (d *dbg) setOperatorN(opn *operatorN) {
d.mu.Lock()
defer d.mu.Unlock()
d.opn = opn
}
// storeKeys lists all keys in the store.
func storeKeys(store map[string]any) []string {
const storeKeySep = "."
var keys []string
for k := range store {
keys = append(keys, k)
switch v := store[k].(type) {
case map[string]any:
subKeys := storeKeys(v)
for _, sk := range subKeys {
keys = append(keys, k+storeKeySep+sk)
}
}
}
sort.Strings(keys)
return keys
}