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Make ParseDockerName() return an error.

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This forces callers to handle cases where the container name could not
be parsed.
This commit is contained in:
Victor Marmol
2015-03-12 16:31:57 -07:00
parent 7d72b64f60
commit 4675fcc57d
4 changed files with 49 additions and 25 deletions
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34
pkg/kubelet/dockertools/docker.go
View File

@@ -402,7 +402,10 @@ func (c DockerContainers) FindPodContainer(podFullName string, uid types.UID, co
continue
}
// TODO(proppy): build the docker container name and do a map lookup instead?
dockerManifestID, dockerUUID, dockerContainerName, hash := ParseDockerName(dockerContainer.Names[0])
dockerManifestID, dockerUUID, dockerContainerName, hash, err := ParseDockerName(dockerContainer.Names[0])
if err != nil {
continue
}
if dockerManifestID == podFullName &&
(uid == "" || dockerUUID == uid) &&
dockerContainerName == containerName {
@@ -425,7 +428,10 @@ func (c DockerContainers) FindContainersByPod(podUID types.UID, podFullName stri
if len(dockerContainer.Names) == 0 {
continue
}
dockerPodName, uuid, _, _ := ParseDockerName(dockerContainer.Names[0])
dockerPodName, uuid, _, _, err := ParseDockerName(dockerContainer.Names[0])
if err != nil {
continue
}
if podUID == uuid ||
(podUID == "" && podFullName == dockerPodName) {
containers[DockerID(dockerContainer.ID)] = dockerContainer
@@ -472,7 +478,10 @@ func GetRecentDockerContainersWithNameAndUUID(client DockerInterface, podFullNam
if len(dockerContainer.Names) == 0 {
continue
}
dockerPodName, dockerUUID, dockerContainerName, _ := ParseDockerName(dockerContainer.Names[0])
dockerPodName, dockerUUID, dockerContainerName, _, err := ParseDockerName(dockerContainer.Names[0])
if err != nil {
continue
}
if dockerPodName != podFullName {
continue
}
@@ -614,7 +623,10 @@ func GetDockerPodInfo(client DockerInterface, manifest api.PodSpec, podFullName
if len(value.Names) == 0 {
continue
}
dockerManifestID, dockerUUID, dockerContainerName, _ := ParseDockerName(value.Names[0])
dockerManifestID, dockerUUID, dockerContainerName, _, err := ParseDockerName(value.Names[0])
if err != nil {
continue
}
if dockerManifestID != podFullName {
continue
}
@@ -705,17 +717,15 @@ func BuildDockerName(podUID types.UID, podFullName string, container *api.Contai
rand.Uint32())
}
// TODO(vmarmol): This should probably return an error.
// Unpacks a container name, returning the pod full name and container name we would have used to
// construct the docker name. If the docker name isn't the one we created, we may return empty strings.
func ParseDockerName(name string) (podFullName string, podUID types.UID, containerName string, hash uint64) {
// construct the docker name. If we are unable to parse the name, an error is returned.
func ParseDockerName(name string) (podFullName string, podUID types.UID, containerName string, hash uint64, err error) {
// For some reason docker appears to be appending '/' to names.
// If it's there, strip it.
if name[0] == '/' {
name = name[1:]
}
name = strings.TrimPrefix(name, "/")
parts := strings.Split(name, "_")
if len(parts) == 0 || parts[0] != containerNamePrefix {
err = fmt.Errorf("failed to parse Docker container name %q into parts", name)
return
}
if len(parts) < 6 {
@@ -723,6 +733,7 @@ func ParseDockerName(name string) (podFullName string, podUID types.UID, contain
// Anything with less fields than this is not something we can
// manage.
glog.Warningf("found a container with the %q prefix, but too few fields (%d): %q", containerNamePrefix, len(parts), name)
err = fmt.Errorf("Docker container name %q has less parts than expected %v", name, parts)
return
}
@@ -730,10 +741,9 @@ func ParseDockerName(name string) (podFullName string, podUID types.UID, contain
nameParts := strings.Split(parts[1], ".")
containerName = nameParts[0]
if len(nameParts) > 1 {
var err error
hash, err = strconv.ParseUint(nameParts[1], 16, 32)
if err != nil {
glog.Warningf("invalid container hash: %s", nameParts[1])
glog.Warningf("invalid container hash %q in container %q", nameParts[1], name)
}
}

10
pkg/kubelet/dockertools/docker_test.go
View File

@@ -93,7 +93,10 @@ func verifyPackUnpack(t *testing.T, podNamespace, podUID, podName, containerName
computedHash := uint64(hasher.Sum32())
podFullName := fmt.Sprintf("%s_%s", podName, podNamespace)
name := BuildDockerName(types.UID(podUID), podFullName, container)
returnedPodFullName, returnedUID, returnedContainerName, hash := ParseDockerName(name)
returnedPodFullName, returnedUID, returnedContainerName, hash, err := ParseDockerName(name)
if err != nil {
t.Errorf("Failed to parse Docker container name %q: %v", name, err)
}
if podFullName != returnedPodFullName || podUID != string(returnedUID) || containerName != returnedContainerName || computedHash != hash {
t.Errorf("For (%s, %s, %s, %d), unpacked (%s, %s, %s, %d)", podFullName, podUID, containerName, computedHash, returnedPodFullName, returnedUID, returnedContainerName, hash)
}
@@ -114,7 +117,10 @@ func TestContainerManifestNaming(t *testing.T) {
name := fmt.Sprintf("k8s_%s_%s_%s_%s_42", container.Name, podName, podNamespace, podUID)
podFullName := fmt.Sprintf("%s_%s", podName, podNamespace)
returnedPodFullName, returnedPodUID, returnedContainerName, hash := ParseDockerName(name)
returnedPodFullName, returnedPodUID, returnedContainerName, hash, err := ParseDockerName(name)
if err != nil {
t.Errorf("Failed to parse Docker container name %q: %v", name, err)
}
if returnedPodFullName != podFullName || string(returnedPodUID) != podUID || returnedContainerName != container.Name || hash != 0 {
t.Errorf("unexpected parse: %s %s %s %d", returnedPodFullName, returnedPodUID, returnedContainerName, hash)
}