forked from drone/drone-runtime
/
runtime.go
300 lines (259 loc) · 5.48 KB
/
runtime.go
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package runtime
import (
"bytes"
"context"
"io"
"io/ioutil"
"strings"
"time"
"github.com/drone/drone-runtime/engine"
"github.com/vincent-petithory/dataurl"
"golang.org/x/sync/errgroup"
)
// Runtime executes a pipeline configuration.
type Runtime struct {
engine engine.Engine
config *engine.Config
hook *Hook
start int64
error error
fs FileSystem
}
// New returns a new runtime using the specified runtime configuration
// and runtime engine.
func New(opts ...Option) *Runtime {
r := new(Runtime)
r.hook = new(Hook)
for _, opts := range opts {
opts(r)
}
return r
}
// Run starts the pipeline and waits for it to complete.
func (r *Runtime) Run(c context.Context) error {
return r.Resume(c, 0)
}
// Resume starts the pipeline at the specified stage and waits
// for it to complete.
func (r *Runtime) Resume(c context.Context, start int) error {
defer func() {
r.engine.Destroy(r.config) // cleanup
}()
r.error = nil
r.start = time.Now().Unix()
if r.hook.Before != nil {
state := snapshot(r, nil, nil)
if err := r.hook.Before(state); err != nil {
return err
}
}
if err := r.engine.Setup(r.config); err != nil {
return err
}
for i, stage := range r.config.Stages {
if i < start {
continue
}
select {
case <-c.Done():
return ErrCancel
case err := <-r.execAll(stage.Steps):
if err != nil {
r.error = err
}
}
}
if r.hook.After != nil {
state := snapshot(r, nil, nil)
if err := r.hook.After(state); err != nil {
return err
}
}
return r.error
}
func (r *Runtime) execAll(group []*engine.Step) <-chan error {
var g errgroup.Group
done := make(chan error)
for _, step := range group {
step := step
g.Go(func() error {
return r.exec(step)
})
}
go func() {
done <- g.Wait()
close(done)
}()
return done
}
func (r *Runtime) exec(step *engine.Step) error {
switch {
case r.error != nil && step.OnFailure == false:
return nil
case r.error == nil && step.OnSuccess == false:
return nil
}
if r.hook.BeforeEach != nil {
state := snapshot(r, step, nil)
if err := r.hook.BeforeEach(state); err == ErrSkip {
return nil
} else if err != nil {
return err
}
}
if err := r.engine.Create(step); err != nil {
return err
}
if r.fs != nil {
state := snapshot(r, step, nil)
if err := restoreAll(state); err != nil {
return err
}
}
if err := r.engine.Start(step); err != nil {
return err
}
rc, err := r.engine.Tail(step)
if err != nil {
return err
}
var g errgroup.Group
state := snapshot(r, step, nil)
g.Go(func() error {
return stream(state, rc)
})
if step.Detached {
return nil // do not wait for service containers to complete.
}
defer func() {
g.Wait() // wait for background tasks to complete.
rc.Close()
}()
wait, err := r.engine.Wait(step)
if err != nil {
return err
}
if r.hook.GotFile != nil {
state := snapshot(r, step, wait)
g.Go(func() error {
return exportAll(state)
})
}
if r.fs != nil {
state := snapshot(r, step, wait)
g.Go(func() error {
return backupAll(state)
})
}
err = g.Wait() // wait for background tasks to complete.
if wait.OOMKilled {
err = &OomError{
Name: step.Name,
Code: wait.ExitCode,
}
} else if wait.ExitCode != 0 {
err = &ExitError{
Name: step.Name,
Code: wait.ExitCode,
}
}
if r.hook.AfterEach != nil {
state := snapshot(r, step, wait)
return r.hook.AfterEach(state)
}
if step.ErrIgnore {
return nil
}
return err
}
// helper function exports a single file or folder.
func stream(state *State, rc io.ReadCloser) error {
defer rc.Close()
w := newWriter(state)
io.Copy(w, rc)
if state.hook.GotLogs != nil {
return state.hook.GotLogs(state, w.lines)
}
return nil
}
// helper function exports files and folders in parallel.
func exportAll(state *State) error {
var g errgroup.Group
for _, file := range state.Step.Exports {
file := file
g.Go(func() error {
return export(state, file)
})
}
return g.Wait()
}
// helper function exports a single file or folder.
func export(state *State, file *engine.File) error {
var (
path = file.Path
mime = file.Mime
)
rc, info, err := state.engine.Download(state.Step, path)
if err != nil {
return err
}
defer rc.Close()
info.Mime = mime
return state.hook.GotFile(state, info, rc)
}
// helper function to backup files and folders in parallel.
func backupAll(state *State) error {
var g errgroup.Group
for _, b := range state.Step.Backup {
b := b
g.Go(func() error {
return backup(state, b)
})
}
return g.Wait()
}
// helper function to backup a single file or folder.
func backup(s *State, b *engine.Snapshot) error {
src, _, err := s.engine.Download(s.Step, b.Source)
if err != nil {
return err
}
defer src.Close()
dst, err := s.fs.Create(b.Target)
if err != nil {
return err
}
_, err = io.Copy(dst, src)
src.Close()
dst.Close()
return err
}
// helper function to restore files and folders serially.
func restoreAll(state *State) error {
for _, b := range state.Step.Restore {
if err := restore(state, b); err != nil {
return err
}
}
return nil
}
// helper function to restore a single file or folder.
func restore(s *State, b *engine.Snapshot) error {
var rc io.ReadCloser
if strings.HasPrefix(b.Source, "data:") {
u, err := dataurl.DecodeString(b.Source)
if err != nil {
return err
}
r := bytes.NewBuffer(u.Data)
rc = ioutil.NopCloser(r)
} else {
var err error
rc, err = s.fs.Open(b.Source)
if err != nil {
return err
}
}
defer rc.Close()
return s.engine.Upload(s.Step, b.Target, rc)
}