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provision.go
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provision.go
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package api
import (
"fmt"
"io/ioutil"
"net/http"
"reflect"
"strconv"
"time"
"github.com/Azure/open-service-broker-azure/pkg/service"
log "github.com/Sirupsen/logrus"
"github.com/deis/async"
"github.com/gorilla/mux"
)
func (s *server) provision(w http.ResponseWriter, r *http.Request) {
instanceID := mux.Vars(r)["instance_id"]
logFields := log.Fields{
"instanceID": instanceID,
}
log.WithFields(logFields).Debug("received provisioning request")
// TODO: krancour: Move all the accepts incomplete stuff into a filter.
// This broker provisions everything asynchronously. If a client doesn't
// explicitly indicate that they will accept an incomplete result, the
// spec says to respond with a 422
acceptsIncompleteStr := r.URL.Query().Get("accepts_incomplete")
if acceptsIncompleteStr == "" {
logFields["parameter"] = "accepts_incomplete=true" // nolint: goconst
log.WithFields(logFields).Debug(
"bad provisioning request: request is missing required query parameter",
)
s.writeResponse(
w,
http.StatusUnprocessableEntity,
generateAsyncRequiredResponse(),
)
return
}
acceptsIncomplete, err := strconv.ParseBool(acceptsIncompleteStr)
if err != nil || !acceptsIncomplete {
logFields["accepts_incomplete"] = acceptsIncompleteStr
log.WithFields(logFields).Debug(
`bad provisioning request: query parameter has invalid value; only ` +
`"true" is accepted`,
)
s.writeResponse(
w,
http.StatusUnprocessableEntity,
generateAsyncRequiredResponse(),
)
return
}
bodyBytes, err := ioutil.ReadAll(r.Body)
if err != nil {
logFields["error"] = err
log.WithFields(logFields).Error(
"pre-provisioning error: error reading request body",
)
s.writeResponse(w, http.StatusInternalServerError, generateEmptyResponse())
return
}
defer r.Body.Close() // nolint: errcheck
provisioningRequest, err := NewProvisioningRequestFromJSON(bodyBytes)
if err != nil {
logFields["error"] = err
log.WithFields(logFields).Debug(
"bad provisioning request: error unmarshaling request body",
)
// krancour: Choosing to interpret this scenario as a bad request, as a
// valid request, obviously contains valid, well-formed JSON
// TODO: Write a more detailed response
s.writeResponse(w, http.StatusBadRequest, generateMalformedRequestResponse())
return
}
serviceID := provisioningRequest.ServiceID
if serviceID == "" {
logFields["field"] = "service_id"
log.WithFields(logFields).Debug(
"bad provisioning request: required request body field is missing",
)
s.writeResponse(w, http.StatusBadRequest, generateServiceIDRequiredResponse())
return
}
planID := provisioningRequest.PlanID
if planID == "" {
logFields["field"] = "plan_id"
log.WithFields(logFields).Debug(
"bad provisioning request: required request body field is missing",
)
s.writeResponse(w, http.StatusBadRequest, generatePlanIDRequiredResponse())
return
}
svc, ok := s.catalog.GetService(serviceID)
if !ok || svc.IsEndOfLife() {
logFields["serviceID"] = serviceID
log.WithFields(logFields).Debug(
"bad provisioning request: invalid serviceID",
)
s.writeResponse(w, http.StatusBadRequest, generateInvalidServiceIDResponse())
return
}
plan, ok := svc.GetPlan(planID)
if !ok || plan.IsEndOfLife() {
logFields["serviceID"] = serviceID
logFields["planID"] = planID
log.WithFields(logFields).Debug(
"bad provisioning request: invalid planID for service",
)
s.writeResponse(w, http.StatusBadRequest, generateInvalidPlanIDResponse())
return
}
// Validate the provisioning parameters
if err :=
plan.GetSchemas().ServiceInstances.ProvisioningParametersSchema.Validate(
provisioningRequest.Parameters,
); err != nil {
var validationErr *service.ValidationError
validationErr, ok = err.(*service.ValidationError)
if ok {
logFields["field"] = validationErr.Field
logFields["issue"] = validationErr.Issue
log.WithFields(logFields).Debug(
"bad provisioning request: validation error",
)
s.writeResponse(
w,
http.StatusBadRequest,
generateValidationFailedResponse(validationErr),
)
return
}
s.writeResponse(w, http.StatusInternalServerError, generateEmptyResponse())
return
}
// Wrap the provisioning parameters with a "params" object that guides access
// to the parameters using schema
pps := plan.GetSchemas().ServiceInstances.ProvisioningParametersSchema
provisioningParameters := &service.ProvisioningParameters{
Parameters: service.Parameters{
Schema: &pps,
Data: provisioningRequest.Parameters,
},
}
// Unpack the generic bits of the parameter map...
// Alias
alias := provisioningParameters.GetString("alias")
// Parent alias
parentAlias := provisioningParameters.GetString("parentAlias")
instance, ok, err := s.store.GetInstance(instanceID)
if err != nil {
logFields["error"] = err
log.WithFields(logFields).Error(
"pre-provisioning error: error retrieving instance by id",
)
s.writeResponse(w, http.StatusInternalServerError, generateEmptyResponse())
return
}
if ok {
// We land in here if an existing instance was found-- the OSB spec
// obligates us to compare this instance to the one that was requested and
// respond with 200 if they're identical or 409 otherwise. It actually seems
// best to compare REQUESTS instead because instance objects also contain
// instance details and other status information. So, let's reverse
// engineer a request from the existing instance then compare it to the
// current request.
//
// Two requests are the same if they are for the same serviceID, the same,
// planID, and all other relevant fields are equal.
if instance.ServiceID == serviceID &&
instance.PlanID == planID &&
((instance.ProvisioningParameters == nil && len(provisioningRequest.Parameters) == 0) || // nolint: lll
(instance.ProvisioningParameters != nil && reflect.DeepEqual(instance.ProvisioningParameters.Data, provisioningRequest.Parameters))) { // nolint: lll
// Per the spec, if fully provisioned, respond with a 200, else a 202.
// Filling in a gap in the spec-- if the status is anything else, we'll
// choose to respond with a 409
switch instance.Status {
case service.InstanceStateProvisioning:
s.writeResponse(w, http.StatusAccepted, generateProvisionAcceptedResponse())
return
case service.InstanceStateProvisioned:
s.writeResponse(w, http.StatusOK, generateEmptyResponse())
return
default:
// TODO: Write a more detailed response
s.writeResponse(w, http.StatusConflict, generateConflictResponse())
return
}
}
// We land in here if an existing instance was found, but its atrributes
// vary from what was requested. The spec requires us to respond with a
// 409
s.writeResponse(w, http.StatusConflict, generateConflictResponse())
return
}
// If we get to here, we need to provision a new instance.
serviceManager := svc.GetServiceManager()
provisioner, err := serviceManager.GetProvisioner(plan)
if err != nil {
logFields["serviceID"] = serviceID
logFields["planID"] = provisioningRequest.PlanID
logFields["error"] = err
log.WithFields(logFields).Error(
"pre-provisioning error: error retrieving provisioner for service and " +
"plan",
)
s.writeResponse(w, http.StatusInternalServerError, generateEmptyResponse())
return
}
firstStepName, ok := provisioner.GetFirstStepName()
if !ok {
logFields["serviceID"] = provisioningRequest.ServiceID
logFields["planID"] = provisioningRequest.PlanID
log.WithFields(logFields).Error(
"pre-provisioning error: no steps found for provisioning service and " +
"plan",
)
s.writeResponse(w, http.StatusInternalServerError, generateEmptyResponse())
return
}
instance = service.Instance{
InstanceID: instanceID,
Alias: alias,
ServiceID: provisioningRequest.ServiceID,
PlanID: provisioningRequest.PlanID,
ProvisioningParameters: provisioningParameters,
Status: service.InstanceStateProvisioning,
ParentAlias: parentAlias,
Created: time.Now(),
}
var task async.Task
var waitForParent bool
if waitForParent, err = s.isParentProvisioning(instance); err != nil {
logFields["error"] = err
log.WithFields(logFields).Error(
"provisioning error: error related to parent instance",
)
s.writeResponse(w, http.StatusBadRequest, generateParentInvalidResponse())
return
} else if waitForParent {
instance.Status = service.InstanceStateProvisioningDeferred
task = async.NewDelayedTask(
"checkParentStatus",
map[string]string{
"instanceID": instanceID,
},
time.Minute*1,
)
log.WithFields(logFields).Debug("parent not provisioned, waiting")
} else {
task = async.NewTask(
"executeProvisioningStep",
map[string]string{
"stepName": firstStepName,
"instanceID": instanceID,
},
)
log.WithFields(logFields).Debug(
"no need to wait for parent, starting provision",
)
}
if err = s.store.WriteInstance(instance); err != nil {
logFields["error"] = err
log.WithFields(logFields).Error(
"provisioning error: error persisting new instance",
)
s.writeResponse(w, http.StatusInternalServerError, generateEmptyResponse())
return
}
if err = s.asyncEngine.SubmitTask(task); err != nil {
logFields["step"] = firstStepName
logFields["error"] = err
log.WithFields(logFields).Error(
"provisioning error: error submitting provisioning task",
)
s.writeResponse(w, http.StatusInternalServerError, generateEmptyResponse())
return
}
// If we get all the way to here, we've been successful!
s.writeResponse(w, http.StatusAccepted, generateProvisionAcceptedResponse())
log.WithFields(logFields).Debug("asynchronous provisioning initiated")
}
func (s *server) isParentProvisioning(instance service.Instance) (bool, error) {
//No parent, so no need to wait
if instance.ParentAlias == "" {
return false, nil
}
parent, parentFound, err := s.store.GetInstanceByAlias(instance.ParentAlias)
if err != nil {
log.WithFields(log.Fields{
"error": "waitforParent",
"instanceID": instance.InstanceID,
"parentAlias": instance.ParentAlias,
}).Error(
"bad provision request: unable to retrieve parent",
)
return false, err
}
//Parent has was not found, so wait for that that to occur
if !parentFound {
return true, nil
}
//If parent failed, we should not even attempt to provision this
if parent.Status == service.InstanceStateProvisioningFailed {
log.WithFields(log.Fields{
"error": "waitforParent",
"instanceID": instance.InstanceID,
"parentID": instance.Parent.InstanceID,
}).Info(
"bad provision request: parent failed provisioning",
)
return false, fmt.Errorf("error provisioning: parent provision failed")
}
//If parent is deprovisioning, we should not even attempt to provision this
if parent.Status == service.InstanceStateDeprovisioning {
log.WithFields(log.Fields{
"error": "waitforParent",
"instanceID": instance.InstanceID,
"parentID": instance.Parent.InstanceID,
}).Info(
"bad provision request: parent is deprovisioning",
)
return false, fmt.Errorf("error provisioning: parent is deprovisioning")
}
//If parent is provisioned, then no need to wait.
if parent.Status == service.InstanceStateProvisioned {
return false, nil
}
return true, nil
}