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package docker | ||
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import ( | ||
"fmt" | ||
"math" | ||
"strconv" | ||
"strings" | ||
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"github.com/containous/traefik/log" | ||
"github.com/containous/traefik/provider" | ||
"github.com/containous/traefik/types" | ||
) | ||
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const ( | ||
labelDockerNetwork = "traefik.docker.network" | ||
labelBackendLoadBalancerSwarm = "traefik.backend.loadbalancer.swarm" | ||
labelDockerComposeProject = "com.docker.compose.project" | ||
labelDockerComposeService = "com.docker.compose.service" | ||
) | ||
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// Map of services properties | ||
// we can get it with label[serviceName][propertyName] and we got the propertyValue | ||
type labelServiceProperties map[string]map[string]string | ||
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// Label functions | ||
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func getFuncInt64Label(labelName string, defaultValue int64) func(container dockerData) int64 { | ||
return func(container dockerData) int64 { | ||
if label, err := getLabel(container, labelName); err == nil { | ||
i, errConv := strconv.ParseInt(label, 10, 64) | ||
if errConv != nil { | ||
log.Errorf("Unable to parse traefik.backend.maxconn.amount %s", label) | ||
return math.MaxInt64 | ||
} | ||
return i | ||
} | ||
return defaultValue | ||
} | ||
} | ||
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func getFuncMapLabel(labelName string) func(container dockerData) map[string]string { | ||
return func(container dockerData) map[string]string { | ||
return parseMapLabel(container, labelName) | ||
} | ||
} | ||
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func parseMapLabel(container dockerData, labelName string) map[string]string { | ||
customHeaders := make(map[string]string) | ||
if label, err := getLabel(container, labelName); err == nil { | ||
for _, headers := range strings.Split(label, ",") { | ||
pair := strings.Split(headers, ":") | ||
if len(pair) != 2 { | ||
log.Warnf("Could not load header %q: %v, skipping...", labelName, pair) | ||
} else { | ||
customHeaders[pair[0]] = pair[1] | ||
} | ||
} | ||
} | ||
if len(customHeaders) == 0 { | ||
log.Errorf("Could not load %q", labelName) | ||
} | ||
return customHeaders | ||
} | ||
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func getFuncStringLabel(label string, defaultValue string) func(container dockerData) string { | ||
return func(container dockerData) string { | ||
return getStringLabel(container, label, defaultValue) | ||
} | ||
} | ||
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func getStringLabel(container dockerData, label string, defaultValue string) string { | ||
if lbl, err := getLabel(container, label); err == nil { | ||
return lbl | ||
} | ||
return defaultValue | ||
} | ||
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func getFuncBoolLabel(label string) func(container dockerData) bool { | ||
return func(container dockerData) bool { | ||
return getBoolLabel(container, label) | ||
} | ||
} | ||
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func getBoolLabel(container dockerData, label string) bool { | ||
lbl, err := getLabel(container, label) | ||
return err == nil && len(lbl) > 0 && strings.EqualFold(strings.TrimSpace(lbl), "true") | ||
} | ||
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func getFuncSliceStringLabel(label string) func(container dockerData) []string { | ||
return func(container dockerData) []string { | ||
return getSliceStringLabel(container, label) | ||
} | ||
} | ||
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func getSliceStringLabel(container dockerData, labelName string) []string { | ||
var value []string | ||
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if label, err := getLabel(container, labelName); err == nil { | ||
value = provider.SplitAndTrimString(label) | ||
} | ||
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if len(value) == 0 { | ||
log.Debugf("Could not load %v labels", labelName) | ||
} | ||
return value | ||
} | ||
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// Service label functions | ||
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func getFuncServiceSliceStringLabel(labelSuffix string) func(container dockerData, serviceName string) []string { | ||
return func(container dockerData, serviceName string) []string { | ||
return getServiceSliceStringLabel(container, serviceName, labelSuffix) | ||
} | ||
} | ||
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func getServiceSliceStringLabel(container dockerData, serviceName string, labelSuffix string) []string { | ||
if value, ok := getContainerServiceLabel(container, serviceName, labelSuffix); ok { | ||
return strings.Split(value, ",") | ||
} | ||
return getSliceStringLabel(container, types.LabelPrefix+labelSuffix) | ||
} | ||
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func getFuncServiceStringLabel(labelSuffix string, defaultValue string) func(container dockerData, serviceName string) string { | ||
return func(container dockerData, serviceName string) string { | ||
return getServiceStringLabel(container, serviceName, labelSuffix, defaultValue) | ||
} | ||
} | ||
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func getServiceStringLabel(container dockerData, serviceName string, labelSuffix string, defaultValue string) string { | ||
if value, ok := getContainerServiceLabel(container, serviceName, labelSuffix); ok { | ||
return value | ||
} | ||
return getStringLabel(container, types.LabelPrefix+labelSuffix, defaultValue) | ||
} | ||
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// Base functions | ||
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// Gets the entry for a service label searching in all labels of the given container | ||
func getContainerServiceLabel(container dockerData, serviceName string, entry string) (string, bool) { | ||
value, ok := extractServicesLabels(container.Labels)[serviceName][entry] | ||
return value, ok | ||
} | ||
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// Extract the service labels from container labels of dockerData struct | ||
func extractServicesLabels(labels map[string]string) labelServiceProperties { | ||
v := make(labelServiceProperties) | ||
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for index, serviceProperty := range labels { | ||
matches := servicesPropertiesRegexp.FindStringSubmatch(index) | ||
if matches != nil { | ||
result := make(map[string]string) | ||
for i, name := range servicesPropertiesRegexp.SubexpNames() { | ||
if i != 0 { | ||
result[name] = matches[i] | ||
} | ||
} | ||
serviceName := result["service_name"] | ||
if _, ok := v[serviceName]; !ok { | ||
v[serviceName] = make(map[string]string) | ||
} | ||
v[serviceName][result["property_name"]] = serviceProperty | ||
} | ||
} | ||
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return v | ||
} | ||
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func hasLabel(label string) func(container dockerData) bool { | ||
return func(container dockerData) bool { | ||
lbl, err := getLabel(container, label) | ||
return err == nil && len(lbl) > 0 | ||
} | ||
} | ||
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func getLabel(container dockerData, label string) (string, error) { | ||
for key, value := range container.Labels { | ||
if key == label { | ||
return value, nil | ||
} | ||
} | ||
return "", fmt.Errorf("label not found: %s", label) | ||
} | ||
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func getLabels(container dockerData, labels []string) (map[string]string, error) { | ||
var globalErr error | ||
foundLabels := map[string]string{} | ||
for _, label := range labels { | ||
foundLabel, err := getLabel(container, label) | ||
// Error out only if one of them is defined. | ||
if err != nil { | ||
globalErr = fmt.Errorf("label not found: %s", label) | ||
continue | ||
} | ||
foundLabels[label] = foundLabel | ||
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} | ||
return foundLabels, globalErr | ||
} |
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