Vendor integration dependencies.

integration/vendor/github.com/docker/libcompose/utils/util.go

@@ -0,0 +1,137 @@
+package utils
+
+import (
+	"encoding/json"
+	"sync"
+
+	"github.com/Sirupsen/logrus"
+
+	yaml "github.com/cloudfoundry-incubator/candiedyaml"
+)
+
+// InParallel holds a pool and a waitgroup to execute tasks in parallel and to be able
+// to wait for completion of all tasks.
+type InParallel struct {
+	wg   sync.WaitGroup
+	pool sync.Pool
+}
+
+// Add runs the specified task in parallel and adds it to the waitGroup.
+func (i *InParallel) Add(task func() error) {
+	i.wg.Add(1)
+
+	go func() {
+		defer i.wg.Done()
+		err := task()
+		if err != nil {
+			i.pool.Put(err)
+		}
+	}()
+}
+
+// Wait waits for all tasks to complete and returns the latest error encountered if any.
+func (i *InParallel) Wait() error {
+	i.wg.Wait()
+	obj := i.pool.Get()
+	if err, ok := obj.(error); ok {
+		return err
+	}
+	return nil
+}
+
+// ConvertByJSON converts a struct (src) to another one (target) using json marshalling/unmarshalling.
+// If the structure are not compatible, this will throw an error as the unmarshalling will fail.
+func ConvertByJSON(src, target interface{}) error {
+	newBytes, err := json.Marshal(src)
+	if err != nil {
+		return err
+	}
+
+	err = json.Unmarshal(newBytes, target)
+	if err != nil {
+		logrus.Errorf("Failed to unmarshall: %v\n%s", err, string(newBytes))
+	}
+	return err
+}
+
+// Convert converts a struct (src) to another one (target) using yaml marshalling/unmarshalling.
+// If the structure are not compatible, this will throw an error as the unmarshalling will fail.
+func Convert(src, target interface{}) error {
+	newBytes, err := yaml.Marshal(src)
+	if err != nil {
+		return err
+	}
+
+	err = yaml.Unmarshal(newBytes, target)
+	if err != nil {
+		logrus.Errorf("Failed to unmarshall: %v\n%s", err, string(newBytes))
+	}
+	return err
+}
+
+// CopySlice creates an exact copy of the provided string slice
+func CopySlice(s []string) []string {
+	if s == nil {
+		return nil
+	}
+	r := make([]string, len(s))
+	copy(r, s)
+	return r
+}
+
+// CopyMap creates an exact copy of the provided string-to-string map
+func CopyMap(m map[string]string) map[string]string {
+	if m == nil {
+		return nil
+	}
+	r := map[string]string{}
+	for k, v := range m {
+		r[k] = v
+	}
+	return r
+}
+
+// FilterStringSet accepts a string set `s` (in the form of `map[string]bool`) and a filtering function `f`
+// and returns a string set containing only the strings `x` for which `f(x) == true`
+func FilterStringSet(s map[string]bool, f func(x string) bool) map[string]bool {
+	result := map[string]bool{}
+	for k := range s {
+		if f(k) {
+			result[k] = true
+		}
+	}
+	return result
+}
+
+// FilterString returns a json representation of the specified map
+// that is used as filter for docker.
+func FilterString(data map[string][]string) string {
+	// I can't imagine this would ever fail
+	bytes, _ := json.Marshal(data)
+	return string(bytes)
+}
+
+// Contains checks if the specified string (key) is present in the specified collection.
+func Contains(collection []string, key string) bool {
+	for _, value := range collection {
+		if value == key {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Merge performs a union of two string slices: the result is an unordered slice
+// that includes every item from either argument exactly once
+func Merge(coll1, coll2 []string) []string {
+	m := map[string]struct{}{}
+	for _, v := range append(coll1, coll2...) {
+		m[v] = struct{}{}
+	}
+	r := make([]string, 0, len(m))
+	for k := range m {
+		r = append(r, k)
+	}
+	return r
+}