pulumi/pkg/backend/watch.go

185 lines
5.0 KiB
Go

// Copyright 2016-2019, Pulumi Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package backend
import (
"bufio"
"context"
"errors"
"fmt"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/pulumi/pulumi/pkg/v3/backend/display"
"github.com/pulumi/pulumi/pkg/v3/operations"
"github.com/pulumi/pulumi/sdk/v3/go/common/apitype"
"github.com/pulumi/pulumi/sdk/v3/go/common/diag/colors"
"github.com/pulumi/pulumi/sdk/v3/go/common/util/cmdutil"
"github.com/pulumi/pulumi/sdk/v3/go/common/util/contract"
"github.com/pulumi/pulumi/sdk/v3/go/common/util/logging"
"github.com/pulumi/pulumi/sdk/v3/go/common/util/result"
)
// Watch watches the project's working directory for changes and automatically updates the active
// stack.
func Watch(ctx context.Context, b Backend, stack Stack, op UpdateOperation,
apply Applier, paths []string,
) result.Result {
opts := ApplierOptions{
DryRun: false,
ShowLink: false,
}
startTime := time.Now()
go func() {
shown := map[operations.LogEntry]bool{}
for {
logs, err := b.GetLogs(ctx, op.SecretsProvider, stack, op.StackConfiguration, operations.LogQuery{
StartTime: &startTime,
})
if err != nil {
logging.V(5).Infof("failed to get logs: %v", err.Error())
}
for _, logEntry := range logs {
if _, shownAlready := shown[logEntry]; !shownAlready {
eventTime := time.Unix(0, logEntry.Timestamp*1000000)
message := strings.TrimRight(logEntry.Message, "\n")
display.PrintfWithWatchPrefix(eventTime, logEntry.ID, "%s\n", message)
shown[logEntry] = true
}
}
time.Sleep(10 * time.Second)
}
}()
// Provided paths can be both relative and absolute.
events, stop, err := watchPaths(op.Root, paths)
if err != nil {
return result.FromError(err)
}
defer stop()
fmt.Printf(op.Opts.Display.Color.Colorize(
colors.SpecHeadline+"Watching (%s):"+colors.Reset+"\n"), stack.Ref())
for range events {
display.PrintfWithWatchPrefix(time.Now(), "",
op.Opts.Display.Color.Colorize(colors.SpecImportant+"Updating..."+colors.Reset+"\n"))
// Perform the update operation
_, _, res := apply(ctx, apitype.UpdateUpdate, stack, op, opts, nil)
if res != nil {
logging.V(5).Infof("watch update failed: %v", res.Error())
if res.Error() == context.Canceled {
return res
}
display.PrintfWithWatchPrefix(time.Now(), "",
op.Opts.Display.Color.Colorize(colors.SpecImportant+"Update failed."+colors.Reset+"\n"))
} else {
display.PrintfWithWatchPrefix(time.Now(), "",
op.Opts.Display.Color.Colorize(colors.SpecImportant+"Update complete."+colors.Reset+"\n"))
}
}
return nil
}
func watchPaths(root string, paths []string) (chan string, func(), error) {
args := []string{"--origin", root}
for _, p := range paths {
watchPath := ""
if path.IsAbs(p) {
watchPath = p
} else {
watchPath = path.Join(root, p)
}
args = append(args, "--watch", watchPath)
}
watchCmd, err := getWatchUtil()
if err != nil {
return nil, nil, err
}
cmd := exec.Command(watchCmd, args...)
cmdutil.RegisterProcessGroup(cmd)
reader, _ := cmd.StdoutPipe()
scanner := bufio.NewScanner(reader)
events := make(chan string)
go stdoutToChannel(scanner, events)
err = cmd.Start()
if err != nil {
return nil, nil, fmt.Errorf("error starting pulumi-watch: %w", err)
}
stop := func() {
err := cmd.Process.Kill()
contract.AssertNoErrorf(err, "Unexpected error stopping pulumi-watch process: %v", err)
}
return events, stop, nil
}
const windowsGOOS = "windows"
func getWatchUtil() (string, error) {
program := "pulumi-watch"
if runtime.GOOS == windowsGOOS {
program = "pulumi-watch.exe"
}
watchCmd, err := exec.LookPath("pulumi-watch")
if err == nil {
return watchCmd, nil
}
exePath, exeErr := os.Executable()
if exeErr == nil {
fullPath, fullErr := filepath.EvalSymlinks(exePath)
if fullErr == nil {
candidate := filepath.Join(filepath.Dir(fullPath), program)
// Let's see if the file is executable. On Windows, os.Stat() returns a mode of "-rw-rw-rw" so on
// on windows we just trust the fact that the .exe can actually be launched.
if stat, err := os.Stat(candidate); err == nil {
if stat.Mode()&0o100 != 0 || runtime.GOOS == windowsGOOS {
return candidate, nil
}
return "", fmt.Errorf("Could not locate an executable pulumi-watch, found %v without execute bit", fullPath)
}
}
}
return "", errors.New("Could not locate pulumi-watch binary")
}
func stdoutToChannel(scanner *bufio.Scanner, out chan string) {
for scanner.Scan() {
out <- scanner.Text()
}
}