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handle.go
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handle.go
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// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package command
import (
"errors"
"fmt"
"os"
"strings"
"github.com/coreos/etcd/Godeps/_workspace/src/github.com/codegangsta/cli"
"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/go-etcd/etcd"
)
type handlerFunc func(*cli.Context, *etcd.Client) (*etcd.Response, error)
type printFunc func(*etcd.Response, string)
type contextualPrintFunc func(*cli.Context, *etcd.Response, string)
// dumpCURL blindly dumps all curl output to os.Stderr
func dumpCURL(client *etcd.Client) {
client.OpenCURL()
for {
fmt.Fprintf(os.Stderr, "Curl-Example: %s\n", client.RecvCURL())
}
}
// rawhandle wraps the command function handlers and sets up the
// environment but performs no output formatting.
func rawhandle(c *cli.Context, fn handlerFunc) (*etcd.Response, error) {
endpoints, err := getEndpoints(c)
if err != nil {
return nil, err
}
tr, err := getTransport(c)
if err != nil {
return nil, err
}
client := etcd.NewClient(endpoints)
client.SetTransport(tr)
if c.GlobalBool("debug") {
go dumpCURL(client)
}
// Sync cluster.
if !c.GlobalBool("no-sync") {
if ok := client.SyncCluster(); !ok {
handleError(ExitBadConnection, errors.New("cannot sync with the cluster using endpoints "+strings.Join(endpoints, ", ")))
}
}
if c.GlobalBool("debug") {
fmt.Fprintf(os.Stderr, "Cluster-Endpoints: %s\n", strings.Join(client.GetCluster(), ", "))
}
// Execute handler function.
return fn(c, client)
}
// handlePrint wraps the command function handlers to parse global flags
// into a client and to properly format the response objects.
func handlePrint(c *cli.Context, fn handlerFunc, pFn printFunc) {
resp, err := rawhandle(c, fn)
// Print error and exit, if necessary.
if err != nil {
handleError(ExitServerError, err)
}
if resp != nil && pFn != nil {
pFn(resp, c.GlobalString("output"))
}
}
// Just like handlePrint but also passed the context of the command
func handleContextualPrint(c *cli.Context, fn handlerFunc, pFn contextualPrintFunc) {
resp, err := rawhandle(c, fn)
if err != nil {
handleError(ExitServerError, err)
}
if resp != nil && pFn != nil {
pFn(c, resp, c.GlobalString("output"))
}
}
// handleDir handles a request that wants to do operations on a single dir.
// Dir cannot be printed out, so we set NIL print function here.
func handleDir(c *cli.Context, fn handlerFunc) {
handlePrint(c, fn, nil)
}
// handleKey handles a request that wants to do operations on a single key.
func handleKey(c *cli.Context, fn handlerFunc) {
handlePrint(c, fn, printKey)
}
func handleAll(c *cli.Context, fn handlerFunc) {
handlePrint(c, fn, printAll)
}