add some more portmapping work

cmd/cluster/clusterCreate.go

@@ -301,7 +301,7 @@ func NewCmdClusterCreate() *cobra.Command {
 	cmd.Flags().StringArrayP("volume", "v", nil, "Mount volumes into the nodes (Format: `[SOURCE:]DEST[@NODEFILTER[;NODEFILTER...]]`\n - Example: `k3d cluster create --agents 2 -v /my/path@agent[0,1] -v /tmp/test:/tmp/other@server[0]`")
 	_ = ppViper.BindPFlag("cli.volumes", cmd.Flags().Lookup("volume"))
 
-	cmd.Flags().StringArrayP("port", "p", nil, "Map ports from the node containers to the host (Format: `[HOST:][HOSTPORT:]CONTAINERPORT[/PROTOCOL][@NODEFILTER]`)\n - Example: `k3d cluster create --agents 2 -p 8080:80@agent[0] -p 8081@agent[1]`")
+	cmd.Flags().StringArrayP("port", "p", nil, "Map ports from the node containers (via the serverlb) to the host (Format: `[HOST:][HOSTPORT:]CONTAINERPORT[/PROTOCOL][@NODEFILTER]`)\n - Example: `k3d cluster create --agents 2 -p 8080:80@agent[0] -p 8081@agent[1]`")
 	_ = ppViper.BindPFlag("cli.ports", cmd.Flags().Lookup("port"))
 
 	cmd.Flags().StringArrayP("k3s-node-label", "", nil, "Add label to k3s node (Format: `KEY[=VALUE][@NODEFILTER[;NODEFILTER...]]`\n - Example: `k3d cluster create --agents 2 --k3s-node-label \"my.label@agent[0,1]\" --k3s-node-label \"other.label=somevalue@server[0]\"`")

pkg/client/node.go

@@ -386,19 +386,7 @@ func NodeCreate(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node, c
 	/* global node configuration (applies for any node role) */
 
 	// ### Labels ###
-	labels := make(map[string]string)
-	for k, v := range k3d.DefaultRuntimeLabels {
-		labels[k] = v
-	}
-	for k, v := range k3d.DefaultRuntimeLabelsVar {
-		labels[k] = v
-	}
-	for k, v := range node.RuntimeLabels {
-		labels[k] = v
-	}
-	node.RuntimeLabels = labels
-	// second most important: the node role label
-	node.RuntimeLabels[k3d.LabelRole] = string(node.Role)
+	node.FillRuntimeLabels()
 
 	for k, v := range node.K3sNodeLabels {
 		node.Args = append(node.Args, "--node-label", fmt.Sprintf("%s=%s", k, v))

pkg/types/loadbalancer.go

@@ -0,0 +1,94 @@
+/*
+Copyright © 2020-2021 The k3d Author(s)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package types
+
+/* DESCRIPTION
+ * The Loadbalancer is a customized NGINX container running side-by-side with the cluster, NOT INSIDE IT.
+ * It is used to do plain proxying of tcp/udp ports to the k3d node containers.
+ * One advantage of this approach is, that we can add new ports while the cluster is still running by re-creating
+ * the loadbalancer and adding the new port config in the NGINX config. As the loadbalancer doesn't hold any state
+ * (apart from the config file), it can easily be re-created in just a few seconds.
+ */
+
+/*
+ * Loadbalancer Definition
+ */
+
+type Loadbalancer struct {
+	Node   Node               `mapstructure:",squash" yaml:",inline"` // the underlying node
+	Config LoadbalancerConfig `mapstructure:"config" yaml:"config"`   // its configuration
+}
+
+func NewLoadbalancer() *Loadbalancer {
+	return &Loadbalancer{
+		Node: Node{
+			Role:  LoadBalancerRole,
+			Image: GetLoadbalancerImage(),
+		},
+	}
+}
+
+/*
+ * Loadbalancer Configuration
+ */
+
+/* LoadbalancerConfig defines the coarse file structure to configure the k3d-proxy
+ * Example:
+ * ports:
+ * 	1234.tcp:
+ * 		- k3d-k3s-default-server-0
+ * 		- k3d-k3s-default-server-1
+ * 	4321.udp:
+ * 		- k3d-k3s-default-agent-0
+ * 		- k3d-k3s-default-agent-1
+ */
+type LoadbalancerConfig struct {
+	Ports    map[string][]string  `yaml:"ports"`
+	Settings LoadBalancerSettings `yaml:"settings"`
+}
+
+type LoadBalancerSettings struct {
+	WorkerProcesses int `yaml:"workerProcesses"`
+}
+
+const (
+	DefaultLoadbalancerConfigPath      = "/etc/confd/values.yaml"
+	DefaultLoadbalancerWorkerProcesses = 1024
+)
+
+type LoadbalancerCreateOpts struct {
+	Labels map[string]string
+}
+
+/*
+ * Helper Functions
+ */
+
+// HasLoadBalancer returns true if cluster has a loadbalancer node
+func (c *Cluster) HasLoadBalancer() bool {
+	for _, node := range c.Nodes {
+		if node.Role == LoadBalancerRole {
+			return true
+		}
+	}
+	return false
+}

pkg/types/node.go

@@ -0,0 +1,39 @@
+/*
+Copyright © 2020-2021 The k3d Author(s)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package types
+
+func (node *Node) FillRuntimeLabels() {
+	labels := make(map[string]string)
+	for k, v := range DefaultRuntimeLabels {
+		labels[k] = v
+	}
+	for k, v := range DefaultRuntimeLabelsVar {
+		labels[k] = v
+	}
+	for k, v := range node.RuntimeLabels {
+		labels[k] = v
+	}
+	node.RuntimeLabels = labels
+	// second most important: the node role label
+	node.RuntimeLabels[LabelRole] = string(node.Role)
+
+}

pkg/types/types.go

@@ -297,16 +297,6 @@ func (c *Cluster) AgentCountRunning() (int, int) {
 	return agentCount, agentsRunning
 }
 
-// HasLoadBalancer returns true if cluster has a loadbalancer node
-func (c *Cluster) HasLoadBalancer() bool {
-	for _, node := range c.Nodes {
-		if node.Role == LoadBalancerRole {
-			return true
-		}
-	}
-	return false
-}
-
 type NodeIP struct {
 	IP     netaddr.IP
 	Static bool
@@ -413,35 +403,3 @@ type RegistryExternal struct {
 	Host     string `yaml:"host" json:"host"`
 	Port     string `yaml:"port" json:"port"`
 }
-
-/*
- * Loadbalancer
- */
-
-/* LoadbalancerConfig defines the coarse file structure to configure the k3d-proxy
- * Example:
- * ports:
- * 	1234.tcp:
- * 		- k3d-k3s-default-server-0
- * 		- k3d-k3s-default-server-1
- * 	4321.udp:
- * 		- k3d-k3s-default-agent-0
- * 		- k3d-k3s-default-agent-1
- */
-type LoadbalancerConfig struct {
-	Ports    map[string][]string  `yaml:"ports"`
-	Settings LoadBalancerSettings `yaml:"settings"`
-}
-
-type LoadBalancerSettings struct {
-	WorkerProcesses int `yaml:"workerProcesses"`
-}
-
-const (
-	DefaultLoadbalancerConfigPath      = "/etc/confd/values.yaml"
-	DefaultLoadbalancerWorkerProcesses = 1024
-)
-
-type LoadbalancerCreateOpts struct {
-	Labels map[string]string
-}

pkg/util/filter.go

@@ -31,15 +31,26 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
+type NodeFilterSuffix string
+
+const (
+	NodeFilterSuffixNone NodeFilterSuffix = "none"
+	NodeFilterMapKeyAll                   = "all"
+)
+
 // Regexp pattern to match node filters
-var filterRegexp = regexp.MustCompile(`^(?P<group>server|agent|loadbalancer|all)(?P<subsetSpec>\[(?P<subset>(?P<subsetList>(\d+,?)+)|(?P<subsetRange>\d*:\d*)|(?P<subsetWildcard>\*))\])?$`)
+var NodeFilterRegexp = regexp.MustCompile(`^(?P<group>server|servers|agent|agents|loadbalancer|all)(?P<subsetSpec>:(?P<subset>(?P<subsetList>(\d+,?)+)|(?P<subsetRange>\d*-\d*)|(?P<subsetWildcard>\*)))?(?P<suffix>:[[:alpha:]]+)?$`)
 
 // FilterNodes takes a string filter to return a filtered list of nodes
-func FilterNodes(nodes []*k3d.Node, filters []string) ([]*k3d.Node, error) {
+func FilterNodes(nodes []*k3d.Node, filters []string) (map[string][]*k3d.Node, error) {
+
+	result := map[string][]*k3d.Node{
+		NodeFilterMapKeyAll: nodes,
+	}
 
 	if len(filters) == 0 || len(filters[0]) == 0 {
 		log.Warnln("No node filter specified")
-		return nodes, nil
+		return result, nil
 	}
 
 	// map roles to subsets
@@ -64,21 +75,21 @@ func FilterNodes(nodes []*k3d.Node, filters []string) ([]*k3d.Node, error) {
 	for _, filter := range filters {
 
 		// match regex with capturing groups
-		match := filterRegexp.FindStringSubmatch(filter)
+		match := NodeFilterRegexp.FindStringSubmatch(filter)
 
 		if len(match) == 0 {
 			return nil, fmt.Errorf("Failed to parse node filters: invalid format or empty subset in '%s'", filter)
 		}
 
 		// map capturing group names to submatches
-		submatches := MapSubexpNames(filterRegexp.SubexpNames(), match)
+		submatches := MapSubexpNames(NodeFilterRegexp.SubexpNames(), match)
 
 		// if one of the filters is 'all', we only return this and drop all others
 		if submatches["group"] == "all" {
 			if len(filters) > 1 {
 				log.Warnf("Node filter 'all' set, but more were specified in '%+v'", filters)
 			}
-			return nodes, nil
+			return result, nil
 		}
 
 		// Choose the group of nodes to operate on