Merge branch '20978-instance-types'

[arvados.git] / lib / dispatchcloud / test / stub_driver.go

diff --git a/lib/dispatchcloud/test/stub_driver.go b/lib/dispatchcloud/test/stub_driver.go
index e91878527c45f82f934b8968e1f208f308088d33..0a74d976063351ba8a3bdff0b35c91d360028c73 100644 (file)
--- a/lib/dispatchcloud/test/stub_driver.go
+++ b/lib/dispatchcloud/test/stub_driver.go
@@ -20,6 +20,7 @@ import (
        "git.arvados.org/arvados.git/lib/cloud"
        "git.arvados.org/arvados.git/lib/crunchrun"
        "git.arvados.org/arvados.git/sdk/go/arvados"
+       "github.com/prometheus/client_golang/prometheus"
        "github.com/sirupsen/logrus"
        "golang.org/x/crypto/ssh"
 )
@@ -33,7 +34,10 @@ type StubDriver struct {
        // SetupVM, if set, is called upon creation of each new
        // StubVM. This is the caller's opportunity to customize the
        // VM's error rate and other behaviors.
-       SetupVM func(*StubVM)
+       //
+       // If SetupVM returns an error, that error will be returned to
+       // the caller of Create(), and the new VM will be discarded.
+       SetupVM func(*StubVM) error
 
        // Bugf, if set, is called if a bug is detected in the caller
        // or stub. Typically set to (*check.C)Errorf. If unset,
@@ -45,7 +49,8 @@ type StubDriver struct {
        Queue *Queue
 
        // Frequency of artificially introduced errors on calls to
-       // Destroy. 0=always succeed, 1=always fail.
+       // Create and Destroy. 0=always succeed, 1=always fail.
+       ErrorRateCreate  float64
        ErrorRateDestroy float64
 
        // If Create() or Instances() is called too frequently, return
@@ -53,6 +58,8 @@ type StubDriver struct {
        MinTimeBetweenCreateCalls    time.Duration
        MinTimeBetweenInstancesCalls time.Duration
 
+       QuotaMaxInstances int
+
        // If true, Create and Destroy calls block until Release() is
        // called.
        HoldCloudOps bool
@@ -62,7 +69,7 @@ type StubDriver struct {
 }
 
 // InstanceSet returns a new *StubInstanceSet.
-func (sd *StubDriver) InstanceSet(params json.RawMessage, id cloud.InstanceSetID, _ cloud.SharedResourceTags, logger logrus.FieldLogger) (cloud.InstanceSet, error) {
+func (sd *StubDriver) InstanceSet(params json.RawMessage, id cloud.InstanceSetID, _ cloud.SharedResourceTags, logger logrus.FieldLogger, reg *prometheus.Registry) (cloud.InstanceSet, error) {
        if sd.holdCloudOps == nil {
                sd.holdCloudOps = make(chan bool)
        }
@@ -120,6 +127,12 @@ func (sis *StubInstanceSet) Create(it arvados.InstanceType, image cloud.ImageID,
        if sis.allowCreateCall.After(time.Now()) {
                return nil, RateLimitError{sis.allowCreateCall}
        }
+       if math_rand.Float64() < sis.driver.ErrorRateCreate {
+               return nil, fmt.Errorf("StubInstanceSet: rand < ErrorRateCreate %f", sis.driver.ErrorRateCreate)
+       }
+       if max := sis.driver.QuotaMaxInstances; max > 0 && len(sis.servers) >= max {
+               return nil, QuotaError{fmt.Errorf("StubInstanceSet: reached QuotaMaxInstances %d", max)}
+       }
        sis.allowCreateCall = time.Now().Add(sis.driver.MinTimeBetweenCreateCalls)
        ak := sis.driver.AuthorizedKeys
        if authKey != nil {
@@ -142,7 +155,10 @@ func (sis *StubInstanceSet) Create(it arvados.InstanceType, image cloud.ImageID,
                Exec:           svm.Exec,
        }
        if setup := sis.driver.SetupVM; setup != nil {
-               setup(svm)
+               err := setup(svm)
+               if err != nil {
+                       return nil, err
+               }
        }
        sis.servers[svm.id] = svm
        return svm.Instance(), nil
@@ -185,6 +201,12 @@ type RateLimitError struct{ Retry time.Time }
 func (e RateLimitError) Error() string            { return fmt.Sprintf("rate limited until %s", e.Retry) }
 func (e RateLimitError) EarliestRetry() time.Time { return e.Retry }
 
+type CapacityError struct{ InstanceTypeSpecific bool }
+
+func (e CapacityError) Error() string                { return "insufficient capacity" }
+func (e CapacityError) IsCapacityError() bool        { return true }
+func (e CapacityError) IsInstanceTypeSpecific() bool { return e.InstanceTypeSpecific }
+
 // StubVM is a fake server that runs an SSH service. It represents a
 // VM running in a fake cloud.
 //
@@ -485,3 +507,9 @@ func copyTags(src cloud.InstanceTags) cloud.InstanceTags {
 func (si stubInstance) PriceHistory(arvados.InstanceType) []cloud.InstancePrice {
        return nil
 }
+
+type QuotaError struct {
+       error
+}
+
+func (QuotaError) IsQuotaError() bool { return true }