// ModeConflicted is responsible for watching and responding to:
// * user resolution of charm upgrade conflicts
// * forced charm upgrade requests
func ModeConflicted(sch *state.Charm) Mode {
return func(u *Uniter) (next Mode, err error) {
defer modeContext("ModeConflicted", &err)()
if err = u.unit.SetStatus(state.UnitError, "upgrade failed"); err != nil {
return nil, err
}
u.f.WantResolvedEvent()
u.f.WantUpgradeEvent(sch.URL(), true)
for {
select {
case <-u.tomb.Dying():
return nil, tomb.ErrDying
case <-u.f.ResolvedEvents():
err = u.charm.Snapshotf("Upgrade conflict resolved.")
if e := u.unit.ClearResolved(); e != nil {
return nil, e
}
if err != nil {
return nil, err
}
return ModeUpgrading(sch), nil
case upgrade := <-u.f.UpgradeEvents():
if err := u.charm.Revert(); err != nil {
return nil, err
}
return ModeUpgrading(upgrade), nil
}
}
panic("unreachable")
}
}
// ModeInstalling is responsible for the initial charm deployment.
func ModeInstalling(sch *state.Charm) Mode {
name := fmt.Sprintf("ModeInstalling %s", sch.URL())
return func(u *Uniter) (next Mode, err error) {
defer modeContext(name, &err)()
if err = u.deploy(sch, Install); err != nil {
return nil, err
}
return ModeContinue, nil
}
}
// deploy deploys the supplied charm, and sets follow-up hook operation state
// as indicated by reason.
func (u *Uniter) deploy(sch *state.Charm, reason Op) error {
if reason != Install && reason != Upgrade {
panic(fmt.Errorf("%q is not a deploy operation", reason))
}
var hi *hook.Info
if u.s != nil && (u.s.Op == RunHook || u.s.Op == Upgrade) {
// If this upgrade interrupts a RunHook, we need to preserve the hook
// info so that we can return to the appropriate error state. However,
// if we're resuming (or have force-interrupted) an Upgrade, we also
// need to preserve whatever hook info was preserved when we initially
// started upgrading, to ensure we still return to the correct state.
hi = u.s.Hook
}
url := sch.URL()
if u.s == nil || u.s.OpStep != Done {
log.Printf("worker/uniter: fetching charm %q", url)
bun, err := u.bundles.Read(sch, u.tomb.Dying())
if err != nil {
return err
}
if err = u.deployer.Stage(bun, url); err != nil {
return err
}
log.Printf("worker/uniter: deploying charm %q", url)
if err = u.writeState(reason, Pending, hi, url); err != nil {
return err
}
if err = u.deployer.Deploy(u.charm); err != nil {
return err
}
if err = u.writeState(reason, Done, hi, url); err != nil {
return err
}
}
log.Printf("worker/uniter: charm %q is deployed", url)
if err := u.unit.SetCharm(sch); err != nil {
return err
}
status := Queued
if hi != nil {
// If a hook operation was interrupted, restore it.
status = Pending
} else {
// Otherwise, queue the relevant post-deploy hook.
hi = &hook.Info{}
switch reason {
case Install:
hi.Kind = hook.Install
case Upgrade:
hi.Kind = hook.UpgradeCharm
}
}
return u.writeState(RunHook, status, hi, nil)
}
// ModeUpgrading is responsible for upgrading the charm.
func ModeUpgrading(sch *state.Charm) Mode {
name := fmt.Sprintf("ModeUpgrading %s", sch.URL())
return func(u *Uniter) (next Mode, err error) {
defer modeContext(name, &err)()
if err = u.deploy(sch, Upgrade); err == charm.ErrConflict {
return ModeConflicted(sch), nil
} else if err != nil {
return nil, err
}
return ModeContinue, nil
}
}
func assertCustomCharm(c *C, ch *state.Charm, series string, meta *charm.Meta, config *charm.Config, revision int) {
// Check Charm interface method results.
c.Assert(ch.Meta(), DeepEquals, meta)
c.Assert(ch.Config(), DeepEquals, config)
c.Assert(ch.Revision(), DeepEquals, revision)
// Test URL matches charm and expected series.
url := ch.URL()
c.Assert(url.Series, Equals, series)
c.Assert(url.Revision, Equals, ch.Revision())
// Ignore the BundleURL and BundleSHA256 methods, they're irrelevant.
}
func (s *ServiceSuite) TestSetCharmConfig(c *C) {
charms := map[string]*state.Charm{
stringConfig: s.AddConfigCharm(c, "wordpress", stringConfig, 1),
emptyConfig: s.AddConfigCharm(c, "wordpress", emptyConfig, 2),
floatConfig: s.AddConfigCharm(c, "wordpress", floatConfig, 3),
newStringConfig: s.AddConfigCharm(c, "wordpress", newStringConfig, 4),
}
for i, t := range setCharmConfigTests {
c.Logf("test %d: %s", i, t.summary)
origCh := charms[t.startconfig]
svc, err := s.State.AddService("wordpress", origCh)
c.Assert(err, IsNil)
err = svc.UpdateConfigSettings(t.startvalues)
c.Assert(err, IsNil)
newCh := charms[t.endconfig]
err = svc.SetCharm(newCh, false)
var expectVals charm.Settings
var expectCh *state.Charm
if t.err != "" {
c.Assert(err, ErrorMatches, t.err)
expectCh = origCh
expectVals = t.startvalues
} else {
c.Assert(err, IsNil)
expectCh = newCh
expectVals = t.endvalues
}
sch, _, err := svc.Charm()
c.Assert(err, IsNil)
c.Assert(sch.URL(), DeepEquals, expectCh.URL())
settings, err := svc.ConfigSettings()
c.Assert(err, IsNil)
if len(expectVals) == 0 {
c.Assert(settings, HasLen, 0)
} else {
c.Assert(settings, DeepEquals, expectVals)
}
err = svc.Destroy()
c.Assert(err, IsNil)
}
}
// download fetches the supplied charm and checks that it has the correct sha256
// hash, then copies it into the directory. If a value is received on abort, the
// download will be stopped.
func (d *BundlesDir) download(sch *state.Charm, abort <-chan struct{}) (err error) {
defer trivial.ErrorContextf(&err, "failed to download charm %q from %q", sch.URL(), sch.BundleURL())
dir := d.downloadsPath()
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
burl := sch.BundleURL().String()
log.Printf("worker/uniter/charm: downloading %s from %s", sch.URL(), burl)
dl := downloader.New(burl, dir)
defer dl.Stop()
for {
select {
case <-abort:
log.Printf("worker/uniter/charm: download aborted")
return fmt.Errorf("aborted")
case st := <-dl.Done():
if st.Err != nil {
return st.Err
}
log.Printf("worker/uniter/charm: download complete")
defer st.File.Close()
hash := sha256.New()
if _, err = io.Copy(hash, st.File); err != nil {
return err
}
actualSha256 := hex.EncodeToString(hash.Sum(nil))
if actualSha256 != sch.BundleSha256() {
return fmt.Errorf(
"expected sha256 %q, got %q", sch.BundleSha256(), actualSha256,
)
}
log.Printf("worker/uniter/charm: download verified")
if err := os.MkdirAll(d.path, 0755); err != nil {
return err
}
return os.Rename(st.File.Name(), d.bundlePath(sch))
}
}
panic("unreachable")
}
// AddService creates a new service with the given name to run the given
// charm. If svcName is empty, the charm name will be used.
func (conn *Conn) AddService(name string, ch *state.Charm) (*state.Service, error) {
if name == "" {
name = ch.URL().Name // TODO ch.Meta().Name ?
}
svc, err := conn.State.AddService(name, ch)
if err != nil {
return nil, err
}
meta := ch.Meta()
for rname, rel := range meta.Peers {
ep := state.Endpoint{
name,
rel.Interface,
rname,
state.RolePeer,
rel.Scope,
}
if _, err := conn.State.AddRelation(ep); err != nil {
return nil, fmt.Errorf("cannot add peer relation %q to service %q: %v", rname, name, err)
}
}
return svc, nil
}
// bundlePath returns the path to the location where the verified charm
// bundle identified by sch will be, or has been, saved.
func (d *BundlesDir) bundlePath(sch *state.Charm) string {
return filepath.Join(d.path, charm.Quote(sch.URL().String()))
}