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db_image_helpers.go
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db_image_helpers.go
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package util
import (
"fmt"
"os/exec"
"reflect"
"strings"
"time"
g "github.com/onsi/ginkgo"
"k8s.io/kubernetes/pkg/util/wait"
e2e "k8s.io/kubernetes/test/e2e/framework"
)
// Database interface allows testing database images.
type Database interface {
// PodName returns the name of the Pod this helper is bound to.
PodName() string
// IsReady indicates whether the underlying Pod is ready for queries.
IsReady(oc *CLI) (bool, error)
// Query queries the database as a regular user.
Query(oc *CLI, query string) (string, error)
// QueryPrivileged queries the database as a privileged user.
QueryPrivileged(oc *CLI, query string) (string, error)
// TestRemoteLogin tests whether it is possible to remote login to hostAddress.
TestRemoteLogin(oc *CLI, hostAddress string) error
}
// ReplicaSet interface allows to interact with database on multiple nodes.
type ReplicaSet interface {
// QueryPrimary queries the database on primary node as a regular user.
QueryPrimary(oc *CLI, query string) (string, error)
}
// WaitForQueryOutputSatisfies will execute the query multiple times, until the
// specified predicate function is return true.
func WaitForQueryOutputSatisfies(oc *CLI, d Database, timeout time.Duration, admin bool, query string, predicate func(string) bool) error {
err := wait.Poll(5*time.Second, timeout, func() (bool, error) {
var (
out string
err error
)
if admin {
out, err = d.QueryPrivileged(oc, query)
} else {
out, err = d.Query(oc, query)
}
fmt.Fprintf(g.GinkgoWriter, "Query %s result: %s\n", query, out)
if _, ok := err.(*ExitError); ok {
// Ignore exit errors
return false, nil
}
if _, ok := err.(*exec.ExitError); ok {
// Ignore exit errors
return false, nil
}
if err != nil {
e2e.Logf("failing immediately with error: %v, type=%v", err, reflect.TypeOf(err))
return false, err
}
if predicate(out) {
return true, nil
}
return false, nil
})
if err == wait.ErrWaitTimeout {
return fmt.Errorf("timed out waiting for query: %q", query)
}
return err
}
// WaitForQueryOutputContains will execute the query multiple times, until the
// specified substring is found in the results. This function should be used for
// testing replication, since it might take some time until the data is propagated
// to slaves.
func WaitForQueryOutputContains(oc *CLI, d Database, timeout time.Duration, admin bool, query, resultSubstr string) error {
return WaitForQueryOutputSatisfies(oc, d, timeout, admin, query, func(resultOutput string) bool {
return strings.Contains(resultOutput, resultSubstr)
})
}
// WaitUntilUp continuously waits for the server to become ready, up until timeout.
func WaitUntilUp(oc *CLI, d Database, timeout time.Duration) error {
err := wait.Poll(2*time.Second, timeout, func() (bool, error) {
return d.IsReady(oc)
})
if err == wait.ErrWaitTimeout {
return fmt.Errorf("timed out waiting for pod %s get up", d.PodName())
}
return err
}
// WaitUntilAllHelpersAreUp waits until all helpers are ready to serve requests.
func WaitUntilAllHelpersAreUp(oc *CLI, helpers []Database) error {
for _, m := range helpers {
if err := WaitUntilUp(oc, m, 3*time.Minute); err != nil {
return err
}
}
return nil
}