Remove runconfig dependency from network routes.

Signed-off-by: David Calavera <david.calavera@gmail.com>

daemon/network/filter.go

@@ -0,0 +1,110 @@
+package network
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+
+	"github.com/docker/docker/runconfig"
+	"github.com/docker/engine-api/types/filters"
+	"github.com/docker/libnetwork"
+)
+
+type filterHandler func([]libnetwork.Network, string) ([]libnetwork.Network, error)
+
+var (
+	// supportedFilters predefined some supported filter handler function
+	supportedFilters = map[string]filterHandler{
+		"type": filterNetworkByType,
+		"name": filterNetworkByName,
+		"id":   filterNetworkByID,
+	}
+
+	// acceptFilters is an acceptable filter flag list
+	// generated for validation. e.g.
+	// acceptedFilters = map[string]bool{
+	//     "type": true,
+	//     "name": true,
+	//     "id":   true,
+	// }
+	AcceptedFilters = func() map[string]bool {
+		ret := make(map[string]bool)
+		for k := range supportedFilters {
+			ret[k] = true
+		}
+		return ret
+	}()
+)
+
+func filterNetworkByType(nws []libnetwork.Network, netType string) (retNws []libnetwork.Network, err error) {
+	switch netType {
+	case "builtin":
+		for _, nw := range nws {
+			if runconfig.IsPreDefinedNetwork(nw.Name()) {
+				retNws = append(retNws, nw)
+			}
+		}
+	case "custom":
+		for _, nw := range nws {
+			if !runconfig.IsPreDefinedNetwork(nw.Name()) {
+				retNws = append(retNws, nw)
+			}
+		}
+	default:
+		return nil, fmt.Errorf("Invalid filter: 'type'='%s'", netType)
+	}
+	return retNws, nil
+}
+
+func filterNetworkByName(nws []libnetwork.Network, name string) (retNws []libnetwork.Network, err error) {
+	for _, nw := range nws {
+		// exact match (fast path)
+		if nw.Name() == name {
+			retNws = append(retNws, nw)
+			continue
+		}
+
+		// regexp match (slow path)
+		match, err := regexp.MatchString(name, nw.Name())
+		if err != nil || !match {
+			continue
+		} else {
+			retNws = append(retNws, nw)
+		}
+	}
+	return retNws, nil
+}
+
+func filterNetworkByID(nws []libnetwork.Network, id string) (retNws []libnetwork.Network, err error) {
+	for _, nw := range nws {
+		if strings.HasPrefix(nw.ID(), id) {
+			retNws = append(retNws, nw)
+		}
+	}
+	return retNws, nil
+}
+
+// FilterAllNetworks filters network list according to user specified filter
+// and returns user chosen networks
+func FilterNetworks(nws []libnetwork.Network, filter filters.Args) ([]libnetwork.Network, error) {
+	// if filter is empty, return original network list
+	if filter.Len() == 0 {
+		return nws, nil
+	}
+
+	var displayNet []libnetwork.Network
+	for fkey, fhandler := range supportedFilters {
+		errFilter := filter.WalkValues(fkey, func(fval string) error {
+			passList, err := fhandler(nws, fval)
+			if err != nil {
+				return err
+			}
+			displayNet = append(displayNet, passList...)
+			return nil
+		})
+		if errFilter != nil {
+			return nil, errFilter
+		}
+	}
+	return displayNet, nil
+}