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apply.go
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/
apply.go
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package provider
import (
"fmt"
"net"
"net/url"
"strings"
"time"
"gopkg.in/mgo.v2/bson"
multierror "github.com/hashicorp/go-multierror"
"github.com/hashicorp/terraform/terraform"
uuid "github.com/satori/go.uuid"
"koding/db/models"
"koding/db/mongodb/modelhelper"
"koding/kites/kloud/eventer"
"koding/kites/kloud/machinestate"
"koding/kites/kloud/stack"
"koding/kites/kloud/stackstate"
"koding/kites/kloud/terraformer"
"koding/kites/kloud/utils/object"
"golang.org/x/net/context"
)
// HandleApply builds and expands compute stack template for the given ID and
// sends an apply request to terraformer.
//
// When destroy=false, building and expanding the stack prior to
// terraformer request is done asynchronously, and the result of
// that operation is communicated back with eventer.
//
// When destroy=true, fetching machines from DB is done synchronously, as
// as soon as Apply method returns, allowed user list for each machine
// is zeroed, which could make the destroy oepration to fail - we
// first build machines and rest of the destroy is perfomed asynchronously.
func (bs *BaseStack) HandleApply(ctx context.Context) (interface{}, error) {
arg, ok := ctx.Value(stack.ApplyRequestKey).(*stack.ApplyRequest)
if !ok {
arg = &stack.ApplyRequest{}
if err := bs.Req.Args.One().Unmarshal(arg); err != nil {
return nil, err
}
}
if err := arg.Valid(); err != nil {
return nil, err
}
err := bs.Builder.BuildStack(arg.StackID, arg.Credentials)
if err != nil && !(arg.Destroy && models.IsNotFound(err, "jStackTemplate")) {
return nil, err
}
if state := bs.Builder.Stack.Stack.State(); state.InProgress() {
return nil, fmt.Errorf("State is currently %s. Please try again later", state)
}
if rt, ok := stack.RequestTraceFromContext(ctx); ok {
rt.Hijack()
}
bs.Arg = arg
if arg.Destroy {
err = bs.destroy(ctx, arg)
} else {
go bs.apply(ctx, arg)
}
if err != nil {
return nil, err
}
return &stack.ControlResult{
EventId: bs.Eventer.ID(),
}, nil
}
func (bs *BaseStack) apply(ctx context.Context, req *stack.ApplyRequest) {
log := bs.Log.New(req.StackID)
bs.Eventer.Push(&eventer.Event{
Message: bs.Req.Method + " started",
Status: machinestate.Building,
})
finalEvent := &eventer.Event{
Message: bs.Req.Method + " finished",
Status: machinestate.Running,
Percentage: 100,
}
start := time.Now()
modelhelper.SetStackState(req.StackID, "Stack building started", stackstate.Building)
log.Info("======> %s started <======", strings.ToUpper(bs.Req.Method))
var err error
defer func() {
if v := recover(); v != nil {
if e, ok := v.(error); ok {
err = e
} else {
err = fmt.Errorf("%v", v)
}
}
if err != nil {
modelhelper.SetStackState(req.StackID, "Stack building failed", stackstate.NotInitialized)
finalEvent.Status = machinestate.NotInitialized
// don't pass the error directly to the eventer, mask it to avoid
// error leaking to the client. We just log it here.
finalEvent.Error = err.Error()
log.Error("======> %s finished with error (time: %s): '%s' <======",
strings.ToUpper(bs.Req.Method), time.Since(start), err.Error())
} else {
modelhelper.SetStackState(req.StackID, "Stack building finished", stackstate.Initialized)
log.Info("======> %s finished (time: %s) <======", strings.ToUpper(bs.Req.Method), time.Since(start))
}
bs.Eventer.Push(finalEvent)
}()
err = bs.applyAsync(ctx, req)
}
func (bs *BaseStack) destroy(ctx context.Context, req *stack.ApplyRequest) error {
log := bs.Log.New(req.StackID)
bs.Eventer.Push(&eventer.Event{
Message: bs.Req.Method + " started",
Status: machinestate.Terminating,
})
start := time.Now()
modelhelper.SetStackState(req.StackID, "Stack destroying started", stackstate.Destroying)
log.Info("======> %s (destroy) started <======", strings.ToUpper(bs.Req.Method))
bs.Eventer.Push(&eventer.Event{
Message: "Fetching and validating machines",
Percentage: 20,
Status: machinestate.Terminating,
})
if err := bs.Builder.BuildMachines(ctx); err != nil {
return err
}
if err := bs.Builder.Database.Detach(); err != nil {
return err
}
// This part is done asynchronously.
go func() {
finalEvent := &eventer.Event{
Message: bs.Req.Method + " finished",
Percentage: 100,
Status: machinestate.Terminated,
}
err := bs.destroyAsync(ctx, req)
if err != nil {
// don't pass the error directly to the eventer, mask it to avoid
// error leaking to the client. We just log it here.
finalEvent.Error = err.Error()
log.Error("======> %s finished with error (time: %s): '%s' <======",
strings.ToUpper(bs.Req.Method), time.Since(start), err)
} else {
log.Info("======> %s finished (time: %s) <======", strings.ToUpper(bs.Req.Method), time.Since(start))
}
bs.Eventer.Push(finalEvent)
}()
return nil
}
func (bs *BaseStack) destroyAsync(ctx context.Context, req *stack.ApplyRequest) error {
if rt, ok := stack.RequestTraceFromContext(ctx); ok {
defer rt.Send()
}
bs.Eventer.Push(&eventer.Event{
Message: "Fetching and validating credentials",
Percentage: 30,
Status: machinestate.Terminating,
})
credIDs := FlattenValues(bs.Builder.Stack.Credentials)
bs.Log.Debug("Fetching '%d' credentials from user '%s'", len(credIDs), bs.Req.Username)
if err := bs.Builder.BuildCredentials(bs.Req.Method, bs.Req.Username, req.GroupName, credIDs); err != nil {
return err
}
bs.Log.Debug("Fetched terraform data: koding=%+v, template=%+v", bs.Builder.Koding, bs.Builder.Template)
if bs.Builder.Stack.Stack.State() != stackstate.NotInitialized {
bs.Log.Debug("Connection to Terraformer")
opts := bs.Session.Terraformer
tfKite, err := terraformer.Connect(opts.Endpoint, opts.SecretKey, opts.Kite)
if err != nil {
return err
}
defer tfKite.Close()
tfReq := &terraformer.TerraformRequest{
ContentID: req.GroupName + "-" + req.StackID,
TraceID: bs.TraceID,
}
bs.Log.Debug("Calling terraform.destroy method with context: %+v", tfReq)
_, err = tfKite.Destroy(tfReq)
if err != nil {
return err
}
}
return bs.Builder.Database.Destroy()
}
func (bs *BaseStack) applyAsync(ctx context.Context, req *stack.ApplyRequest) error {
if rt, ok := stack.RequestTraceFromContext(ctx); ok {
defer rt.Send()
}
bs.Eventer.Push(&eventer.Event{
Message: "Fetching and validating machines",
Percentage: 20,
Status: machinestate.Building,
})
if err := bs.Builder.BuildMachines(ctx); err != nil {
return err
}
bs.Eventer.Push(&eventer.Event{
Message: "Fetching and validating credentials",
Percentage: 30,
Status: machinestate.Building,
})
credIDs := FlattenValues(bs.Builder.Stack.Credentials)
bs.Log.Debug("Fetching '%d' credentials from user '%s'", len(credIDs), bs.Req.Username)
if err := bs.Builder.BuildCredentials(bs.Req.Method, bs.Req.Username, req.GroupName, credIDs); err != nil {
return err
}
cred, err := bs.Builder.CredentialByProvider(bs.Provider.Name)
if err != nil {
return err
}
bs.Log.Debug("Fetched terraform data: koding=%+v, template=%+v", bs.Builder.Koding, bs.Builder.Template)
opts := bs.Session.Terraformer
tfKite, err := terraformer.Connect(opts.Endpoint, opts.SecretKey, opts.Kite)
if err != nil {
return err
}
defer tfKite.Close()
defaultContentID := req.GroupName + "-" + req.StackID
bs.Log.Debug("Building template: %s", defaultContentID)
if err := bs.Builder.BuildTemplate(bs.Builder.Stack.Template, defaultContentID); err != nil {
return err
}
if len(req.Variables) != 0 {
if err := bs.Builder.Template.InjectVariables("", req.Variables); err != nil {
return err
}
}
bs.Log.Debug("Stack template before injecting Koding data: %s", bs.Builder.Template)
t, err := bs.stack.ApplyTemplate(cred)
if err != nil {
return err
}
if t.Key == "" {
t.Key = defaultContentID
}
bs.Log.Debug("Stack template after injecting Koding data: %s", t)
bs.Builder.Stack.Template = t.Content
done := make(chan struct{})
// because apply can last long, we are going to increment the eventer's
// percentage as long as we build automatically.
go func() {
start := 45
ticker := time.NewTicker(time.Second * 5)
defer ticker.Stop()
for {
select {
case <-done:
return
case <-ticker.C:
if start < 70 {
start += 5
}
bs.Eventer.Push(&eventer.Event{
Message: "Building stack resources",
Percentage: start,
Status: machinestate.Building,
})
}
}
}()
tfReq := &terraformer.TerraformRequest{
Content: bs.Builder.Stack.Template,
ContentID: t.Key,
TraceID: bs.TraceID,
}
bs.Log.Debug("Final stack template. Calling terraform.apply method:")
bs.Log.Debug("%+v", tfReq)
state, err := tfKite.Apply(tfReq)
close(done)
if err != nil {
return err
}
bs.Eventer.Push(&eventer.Event{
Message: "Checking VM connections",
Percentage: 70,
Status: machinestate.Building,
})
if bs.Klients, err = bs.Planner.DialKlients(ctx, bs.KlientIDs); err != nil {
return err
}
bs.Eventer.Push(&eventer.Event{
Message: "Updating machine settings",
Percentage: 90,
Status: machinestate.Building,
})
err = bs.UpdateResources(state)
if e := bs.Builder.UpdateStack(); e != nil && err == nil {
err = e
}
return err
}
func (bs *BaseStack) UpdateResources(state *terraform.State) error {
machines, err := bs.state(state)
if err != nil {
return err
}
now := time.Now().UTC()
for label, m := range bs.Builder.Machines {
machine, ok := machines[label]
if !ok {
err = multierror.Append(err, fmt.Errorf("machine %q does not exist in terraform state file", label))
continue
}
if machine.Provider != bs.Planner.Provider {
continue
}
if cred, e := bs.Builder.CredentialByProvider(machine.Provider); e == nil {
machine.Credential = cred
} else {
err = multierror.Append(err, fmt.Errorf("machine %q: no credential found for %q provider: %s", label, machine.Provider, e))
machine.Credential = &stack.Credential{}
}
state, ok := bs.Klients[label]
if !ok {
err = multierror.Append(err, fmt.Errorf("machine %q does not exist in dial state", label))
continue
}
e := modelhelper.UpdateMachine(m.ObjectId, bson.M{"$set": bs.buildUpdateObj(machine, state, now)})
if e != nil {
err = multierror.Append(err, fmt.Errorf("machine %q failed to update: %s", label, e))
continue
}
}
return err
}
func (bs *BaseStack) buildUpdateObj(m *stack.Machine, s *DialState, now time.Time) bson.M {
obj := object.MetaBuilder.Build(bs.Provider.newMetadata(m))
obj["credential"] = m.Credential.Identifier
obj["provider"] = bs.Provider.Name
obj["queryString"] = m.QueryString
obj["status.modifiedAt"] = now
obj["status.state"] = m.State.String()
obj["status.reason"] = m.StateReason
for k, v := range object.MetaBuilder.Build(m.Meta) {
obj[k] = v
}
if s.KiteURL != "" {
obj["registerUrl"] = s.KiteURL
if u, err := url.Parse(s.KiteURL); err == nil && u.Host != "" {
if host, _, err := net.SplitHostPort(u.Host); err == nil {
u.Host = host
}
obj["ipAddress"] = u.Host
}
}
bs.Log.Debug("update object for %q: %+v (%# v)", m.Label, obj, s)
return bson.M(obj)
}
func (bs *BaseStack) BuildKiteKey(label, username string) (string, error) {
kiteID := uuid.NewV4().String()
kiteKey, err := bs.Session.Userdata.Keycreator.Create(username, kiteID)
if err != nil {
return "", err
}
bs.KlientIDs[label] = kiteID
return kiteKey, nil
}