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labelsannotations.go
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labelsannotations.go
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package v1
import (
"fmt"
"strings"
)
const (
LabelTypeRouter = "router"
LabelTypeContainer = "container"
LabelTypeJob = "job"
LabelTypeVolume = "volume"
LabelTypeSecret = "secret"
LabelTypeMeta = "metadata"
LabelTypeAcorn = "acorn"
LabelTypeService = "service"
)
var canonicalTypes = map[string]string{
"router": LabelTypeRouter,
"routers": LabelTypeRouter,
"container": LabelTypeContainer,
"containers": LabelTypeContainer,
"job": LabelTypeJob,
"jobs": LabelTypeJob,
"volume": LabelTypeVolume,
"volumes": LabelTypeVolume,
"secret": LabelTypeSecret,
"secrets": LabelTypeSecret,
"metadata": LabelTypeMeta,
"metadatas": LabelTypeMeta,
"acorn": LabelTypeAcorn,
"acorns": LabelTypeAcorn,
"service": LabelTypeService,
"services": LabelTypeService,
}
// ParseScopedLabels parses labels from their string format into the struct form. Examples of the string format:
// --label k=v (global, no resource scope)
// --label containers:k=v (apply to all containers)
// --label containers:foo:k=v (apply to container named foo)
// --label foo:k=v (apply to any resource named foo)
func ParseScopedLabels(s ...string) (result []ScopedLabel, err error) {
for _, s := range s {
k, v, _ := strings.Cut(s, "=")
l, err := parseScopedLabel(k, v)
if err != nil {
return nil, err
}
result = append(result, l)
}
return result, nil
}
// similar to the above function, but the string has been split into a key and value already, like:
// key="containers:foo:k" value="v"
func parseScopedLabel(k, v string) (ScopedLabel, error) {
scopeAndKeyParts := strings.Split(k, ":")
var key, resourceType, resourceName string
switch len(scopeAndKeyParts) {
case 1:
key = scopeAndKeyParts[0]
case 2:
scopePart := canonicalTypes[strings.ToLower(scopeAndKeyParts[0])]
if scopePart != "" {
resourceType = scopePart
} else {
resourceName = scopeAndKeyParts[0]
}
key = scopeAndKeyParts[1]
case 3:
scopeTypePart := canonicalTypes[strings.ToLower(scopeAndKeyParts[0])]
if scopeTypePart != "" {
resourceType = scopeTypePart
} else {
return ScopedLabel{}, fmt.Errorf("cannot parse label %v. Unrecognized scope type [%v]", k, scopeAndKeyParts[0])
}
resourceName = scopeAndKeyParts[1]
if resourceName == "" {
return ScopedLabel{}, fmt.Errorf("cannot parse label %v. Unrecognized scope format", k)
}
key = scopeAndKeyParts[2]
default:
return ScopedLabel{}, fmt.Errorf("cannot parse label %v. Unrecognized scope format", k)
}
return ScopedLabel{
ResourceType: resourceType,
ResourceName: resourceName,
Key: key,
Value: v,
}, nil
}
func canonicalResourceType(rType string) (string, error) {
if rType == "" {
return rType, nil
}
normalized := canonicalTypes[strings.ToLower(rType)]
if normalized == "" {
return "", fmt.Errorf("unrecognized scope resourceType [%v]", rType)
}
return normalized, nil
}