| // Copyright 2015 The etcd Authors |
| // |
| // 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 ( |
| "bufio" |
| "context" |
| "fmt" |
| "os" |
| "strconv" |
| "strings" |
| |
| "github.com/coreos/etcd/clientv3" |
| pb "github.com/coreos/etcd/etcdserver/etcdserverpb" |
| |
| "github.com/spf13/cobra" |
| ) |
| |
| var ( |
| txnInteractive bool |
| ) |
| |
| // NewTxnCommand returns the cobra command for "txn". |
| func NewTxnCommand() *cobra.Command { |
| cmd := &cobra.Command{ |
| Use: "txn [options]", |
| Short: "Txn processes all the requests in one transaction", |
| Run: txnCommandFunc, |
| } |
| cmd.Flags().BoolVarP(&txnInteractive, "interactive", "i", false, "Input transaction in interactive mode") |
| return cmd |
| } |
| |
| // txnCommandFunc executes the "txn" command. |
| func txnCommandFunc(cmd *cobra.Command, args []string) { |
| if len(args) != 0 { |
| ExitWithError(ExitBadArgs, fmt.Errorf("txn command does not accept argument.")) |
| } |
| |
| reader := bufio.NewReader(os.Stdin) |
| |
| txn := mustClientFromCmd(cmd).Txn(context.Background()) |
| promptInteractive("compares:") |
| txn.If(readCompares(reader)...) |
| promptInteractive("success requests (get, put, del):") |
| txn.Then(readOps(reader)...) |
| promptInteractive("failure requests (get, put, del):") |
| txn.Else(readOps(reader)...) |
| |
| resp, err := txn.Commit() |
| if err != nil { |
| ExitWithError(ExitError, err) |
| } |
| |
| display.Txn(*resp) |
| } |
| |
| func promptInteractive(s string) { |
| if txnInteractive { |
| fmt.Println(s) |
| } |
| } |
| |
| func readCompares(r *bufio.Reader) (cmps []clientv3.Cmp) { |
| for { |
| line, err := r.ReadString('\n') |
| if err != nil { |
| ExitWithError(ExitInvalidInput, err) |
| } |
| |
| // remove space from the line |
| line = strings.TrimSpace(line) |
| if len(line) == 0 { |
| break |
| } |
| |
| cmp, err := parseCompare(line) |
| if err != nil { |
| ExitWithError(ExitInvalidInput, err) |
| } |
| cmps = append(cmps, *cmp) |
| } |
| |
| return cmps |
| } |
| |
| func readOps(r *bufio.Reader) (ops []clientv3.Op) { |
| for { |
| line, err := r.ReadString('\n') |
| if err != nil { |
| ExitWithError(ExitInvalidInput, err) |
| } |
| |
| // remove space from the line |
| line = strings.TrimSpace(line) |
| if len(line) == 0 { |
| break |
| } |
| |
| op, err := parseRequestUnion(line) |
| if err != nil { |
| ExitWithError(ExitInvalidInput, err) |
| } |
| ops = append(ops, *op) |
| } |
| |
| return ops |
| } |
| |
| func parseRequestUnion(line string) (*clientv3.Op, error) { |
| args := argify(line) |
| if len(args) < 2 { |
| return nil, fmt.Errorf("invalid txn compare request: %s", line) |
| } |
| |
| opc := make(chan clientv3.Op, 1) |
| |
| put := NewPutCommand() |
| put.Run = func(cmd *cobra.Command, args []string) { |
| key, value, opts := getPutOp(cmd, args) |
| opc <- clientv3.OpPut(key, value, opts...) |
| } |
| get := NewGetCommand() |
| get.Run = func(cmd *cobra.Command, args []string) { |
| key, opts := getGetOp(cmd, args) |
| opc <- clientv3.OpGet(key, opts...) |
| } |
| del := NewDelCommand() |
| del.Run = func(cmd *cobra.Command, args []string) { |
| key, opts := getDelOp(cmd, args) |
| opc <- clientv3.OpDelete(key, opts...) |
| } |
| cmds := &cobra.Command{SilenceErrors: true} |
| cmds.AddCommand(put, get, del) |
| |
| cmds.SetArgs(args) |
| if err := cmds.Execute(); err != nil { |
| return nil, fmt.Errorf("invalid txn request: %s", line) |
| } |
| |
| op := <-opc |
| return &op, nil |
| } |
| |
| func parseCompare(line string) (*clientv3.Cmp, error) { |
| var ( |
| key string |
| op string |
| val string |
| ) |
| |
| lparenSplit := strings.SplitN(line, "(", 2) |
| if len(lparenSplit) != 2 { |
| return nil, fmt.Errorf("malformed comparison: %s", line) |
| } |
| |
| target := lparenSplit[0] |
| n, serr := fmt.Sscanf(lparenSplit[1], "%q) %s %q", &key, &op, &val) |
| if n != 3 { |
| return nil, fmt.Errorf("malformed comparison: %s; got %s(%q) %s %q", line, target, key, op, val) |
| } |
| if serr != nil { |
| return nil, fmt.Errorf("malformed comparison: %s (%v)", line, serr) |
| } |
| |
| var ( |
| v int64 |
| err error |
| cmp clientv3.Cmp |
| ) |
| switch target { |
| case "ver", "version": |
| if v, err = strconv.ParseInt(val, 10, 64); err == nil { |
| cmp = clientv3.Compare(clientv3.Version(key), op, v) |
| } |
| case "c", "create": |
| if v, err = strconv.ParseInt(val, 10, 64); err == nil { |
| cmp = clientv3.Compare(clientv3.CreateRevision(key), op, v) |
| } |
| case "m", "mod": |
| if v, err = strconv.ParseInt(val, 10, 64); err == nil { |
| cmp = clientv3.Compare(clientv3.ModRevision(key), op, v) |
| } |
| case "val", "value": |
| cmp = clientv3.Compare(clientv3.Value(key), op, val) |
| case "lease": |
| cmp = clientv3.Compare(clientv3.Cmp{Target: pb.Compare_LEASE}, op, val) |
| default: |
| return nil, fmt.Errorf("malformed comparison: %s (unknown target %s)", line, target) |
| } |
| |
| if err != nil { |
| return nil, fmt.Errorf("invalid txn compare request: %s", line) |
| } |
| |
| return &cmp, nil |
| } |