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executor.go
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executor.go
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package ops
import (
"fmt"
"hash/fnv"
"io"
"os"
"os/signal"
"strings"
"sync"
"time"
"github.com/briandowns/spinner"
"github.com/gookit/color"
"github.com/jevi061/ops/internal/connector"
"github.com/jevi061/ops/internal/prefixer"
"github.com/jevi061/ops/internal/termsize"
"github.com/mattn/go-runewidth"
)
type cliExecutor struct {
conf *Opsfile
debug bool
dryRun bool
}
func NewExecutor(conf *Opsfile, debug bool, dryRun bool) *cliExecutor {
return &cliExecutor{conf: conf, debug: debug, dryRun: dryRun}
}
func (e *cliExecutor) Execute(tasks []connector.Task, connectors []connector.Connector) error {
hasRemoteTask := e.hasRemoteTask(tasks)
// connect
for _, c := range connectors {
if !(!c.Local() && !hasRemoteTask) {
if err := c.Connect(); err != nil {
return err
} else {
defer c.Close()
}
}
}
// relay signals to runners
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt)
go func() {
if err := e.RelaySignals(connectors, signals); err != nil {
fmt.Fprintln(os.Stderr, "RUN ERROR:", err)
os.Exit(1)
}
}()
defer func() {
signal.Stop(signals)
close(signals)
}()
// update prompets
if e.debug || e.dryRun {
e.AlignAndColorTaskRunnersPromets(connectors)
}
// execute tasks through connectors
green, red := color.Green.Render, color.Red.Render
sp := spinner.New(spinner.CharSets[11], 100*time.Millisecond, spinner.WithHiddenCursor(true), spinner.WithFinalMSG(""))
for _, t := range tasks {
for _, c := range connectors {
if t.Local() == c.Local() {
e.PrintTaskHeader(t, '-')
//fmt.Printf("run task: [%s] on connector: [%s]\n", t.Name(), c.Host())
if !e.debug && !e.dryRun {
sp.Start()
}
if err := c.Run(t, &connector.RunOptions{Debug: e.debug, DryRun: e.dryRun}); err != nil {
if e.conf.FailFast {
return err
} else {
fmt.Fprintln(os.Stderr, color.Red.Render(err.Error()))
}
}
if !e.dryRun {
if err := e.HandleInputAndOutput(t, c); err != nil {
if e.conf.FailFast {
return err
}
fmt.Fprintln(os.Stderr, color.Red.Render(err.Error()))
}
sp.Stop()
if err := c.Wait(); err != nil {
fmt.Printf("Server: [%s] Status: %s Reason: %s\n", c.Host(), red("Error"), red(err.Error()))
if e.conf.FailFast {
return err
}
} else {
fmt.Printf("Server: [%s] Status: %s\n", c.Host(), green("Success"))
}
}
}
}
}
return nil
}
// RelaySignals realy incoming signals to avaliable runners, it will block until signals chan closed
func (e *cliExecutor) RelaySignals(runners []connector.Connector, signals chan os.Signal) error {
for {
sig, ok := <-signals
if !ok {
return nil
}
for _, r := range runners {
err := r.Signal(sig)
if err != nil {
return fmt.Errorf("send signal to connector: [%s] failed: %w", r.Host(), err)
}
}
}
}
func (e *cliExecutor) HandleInputAndOutput(task connector.Task, c connector.Connector) error {
var wg sync.WaitGroup
if e.debug {
// copy remote computer's stdout to current
wg.Add(1)
go func(rn connector.Connector) {
defer wg.Done()
_, err := io.Copy(os.Stdout, prefixer.NewPrefixReader(rn.Stdout(), rn.Promet()))
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
}(c)
// copy remote computer's stderr to current
wg.Add(1)
go func(rn connector.Connector) {
defer wg.Done()
_, err := io.Copy(os.Stderr, prefixer.NewPrefixReader(rn.Stderr(), rn.Promet()))
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
}(c)
} else {
// discard stdout
wg.Add(1)
go func(rn connector.Connector) {
defer wg.Done()
io.Copy(io.Discard, rn.Stdout())
}(c)
// discard stderr
wg.Add(1)
go func(rn connector.Connector) {
defer wg.Done()
io.Copy(io.Discard, rn.Stderr())
}(c)
}
if task.Stdin() != nil {
stdin, err := task.Stdin()()
if err != nil {
return err
}
wg.Add(1)
go func(rn connector.Connector) {
defer wg.Done()
defer rn.Stdin().Close()
io.Copy(rn.Stdin(), stdin)
}(c)
}
wg.Wait()
return nil
}
func (e *cliExecutor) AlignAndColorTaskRunnersPromets(connectors []connector.Connector) {
// align and color connector promets
colors := []func(a ...interface{}) string{color.Yellow.Render, color.Cyan.Render,
color.Magenta.Render, color.Blue.Render}
max := 0
for _, r := range connectors {
prefixLen := runewidth.StringWidth(r.Promet())
if prefixLen > max {
max = prefixLen
}
}
//fmt.Println("max promets len:", max)
hash := fnv.New32a()
for _, r := range connectors {
prefixLen := runewidth.StringWidth(r.Promet())
if prefixLen <= max { // Left padding.
p := strings.Repeat(" ", max-prefixLen) + r.Promet()
hash.Write([]byte(p))
color := colors[int(hash.Sum32())%len(colors)]
r.SetPromet(color(p))
//fmt.Println("update runner:", r.Host(), "promets with:", max-prefixLen, "blanks")
}
}
}
func (e *cliExecutor) hasRemoteTask(tasks []connector.Task) bool {
for _, t := range tasks {
if !t.Local() {
return true
}
}
return false
}
func (e *cliExecutor) PrintTaskHeader(t connector.Task, divider byte) {
gray, bold := color.Gray.Render, color.Bold.Render
fmt.Printf("%s [%s] %s\n", bold("Task:"), bold(t.Name()), gray(t.Desc()))
w, _ := termsize.DefaultSize(10, 0)
fmt.Println(strings.Repeat(string(divider), w))
}