api/uniter: ReadSettings to use params.Settings

worker/apiuniter/jujuc/relation-set.go

Index: worker/apiuniter/jujuc/relation-set.go
=== added file 'worker/apiuniter/jujuc/relation-set.go'
--- worker/apiuniter/jujuc/relation-set.go	1970-01-01 00:00:00 +0000
+++ worker/apiuniter/jujuc/relation-set.go	2013-09-10 12:21:02 +0000
@@ -0,0 +1,72 @@
+// Copyright 2012, 2013 Canonical Ltd.
+// Licensed under the AGPLv3, see LICENCE file for details.
+
+package jujuc
+
+import (
+	"fmt"
+	"strings"
+
+	"launchpad.net/gnuflag"
+
+	"launchpad.net/juju-core/cmd"
+)
+
+// RelationSetCommand implements the relation-set command.
+type RelationSetCommand struct {
+	cmd.CommandBase
+	ctx        Context
+	RelationId int
+	Settings   map[string]string
+	formatFlag string // deprecated
+}
+
+func NewRelationSetCommand(ctx Context) cmd.Command {
+	return &RelationSetCommand{ctx: ctx, Settings: map[string]string{}}
+}
+
+func (c *RelationSetCommand) Info() *cmd.Info {
+	return &cmd.Info{
+		Name:    "relation-set",
+		Args:    "key=value [key=value ...]",
+		Purpose: "set relation settings",
+	}
+}
+
+func (c *RelationSetCommand) SetFlags(f *gnuflag.FlagSet) {
+	f.Var(newRelationIdValue(c.ctx, &c.RelationId), "r", "specify a relation by id")
+	f.StringVar(&c.formatFlag, "format", "", "deprecated format flag")
+}
+
+func (c *RelationSetCommand) Init(args []string) error {
+	if c.RelationId == -1 {
+		return fmt.Errorf("no relation id specified")
+	}
+	for _, kv := range args {
+		parts := strings.SplitN(kv, "=", 2)
+		if len(parts) != 2 || len(parts[0]) == 0 {
+			return fmt.Errorf(`expected "key=value", got %q`, kv)
+		}
+		c.Settings[parts[0]] = parts[1]
+	}
+	return nil
+}
+
+func (c *RelationSetCommand) Run(ctx *cmd.Context) (err error) {
+	if c.formatFlag != "" {
+		fmt.Fprintf(ctx.Stderr, "--format flag deprecated for command %q", c.Info().Name)
+	}
+	r, found := c.ctx.Relation(c.RelationId)
+	if !found {
+		return fmt.Errorf("unknown relation id")
+	}
+	settings, err := r.Settings()
+	for k, v := range c.Settings {
+		if v != "" {
+			settings.Set(k, v)
+		} else {
+			settings.Delete(k)
+		}
+	}
+	return nil
+}