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context.go
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context.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 executor
import (
"fmt"
"io"
"github.com/apache/incubator-pegasus/go-client/pegasus"
"github.com/apache/incubator-pegasus/go-client/session"
"github.com/apache/incubator-pegasus/pegic/executor/util"
)
type Context struct {
// Every command should use Context as the fmt.Fprint's writer.
io.Writer
pegasus.Client
Meta *session.MetaManager
// default to nil
UseTable pegasus.TableConnector
UseTableName string
// default to 0
UseTablePartitionCount int
// default to nil
Compressor util.BytesCompression
HashKeyEnc, SortKeyEnc, ValueEnc util.Encoder
}
func NewContext(writer io.Writer, metaAddrs []string) *Context {
c := &Context{
Writer: writer,
Client: pegasus.NewClient(pegasus.Config{
MetaServers: metaAddrs,
}),
Meta: session.NewMetaManager(metaAddrs, session.NewNodeSession),
// by default, string uses utf-8 as encoding to bytes
HashKeyEnc: util.NewEncoder("utf8"),
SortKeyEnc: util.NewEncoder("utf8"),
ValueEnc: util.NewEncoder("utf8"),
}
return c
}
// String returns a human-readable string of context.
func (c *Context) String() string {
output := "\nEncoding:\n"
output += " - HashKey: " + c.HashKeyEnc.String() + "\n"
output += " - SortKey: " + c.SortKeyEnc.String() + "\n"
output += " - Value: " + c.ValueEnc.String() + "\n"
if c.Compressor != nil {
output += "Compression:\n"
output += " " + c.Compressor.String() + "\n"
}
return output
}
// readPegasusArgs assumes the args to be [hashkey, sortkey, value].
// It returns the bytes encoded from the args if no failure.
func readPegasusArgs(ctx *Context, args []string) ([][]byte, error) {
// the first argument must be hashkey
hashkey, err := ctx.HashKeyEnc.EncodeAll(args[0])
if err != nil {
return nil, err
}
if len(args) == 1 {
return [][]byte{hashkey}, nil
}
sortkey, err := ctx.SortKeyEnc.EncodeAll(args[1])
if err != nil {
return nil, err
}
if len(args) == 2 {
return [][]byte{hashkey, sortkey}, nil
}
value, err := ctx.ValueEnc.EncodeAll(args[2])
if err != nil {
return nil, err
}
if len(args) == 3 {
return [][]byte{hashkey, sortkey, value}, nil
}
panic("more than 3 arguments are given")
}
// printPegasusRecord prints bytes from pegasus in pretty and parsable form.
func printPegasusRecord(ctx *Context, hashKey, sortKey, value []byte) error {
if ctx.Compressor != nil {
var err error
value, err = ctx.Compressor.Decompress(value)
if err != nil {
return fmt.Errorf("%s failed to decompress value: %s", ctx.Compressor, err)
}
}
hashKeyStr, err := ctx.HashKeyEnc.DecodeAll(hashKey)
if err != nil {
return fmt.Errorf("HashKey can not be decoded in %s: %s", ctx.HashKeyEnc, err)
}
sortkeyStr, err := ctx.SortKeyEnc.DecodeAll(sortKey)
if err != nil {
return fmt.Errorf("SortKey can not be decoded in %s: %s", ctx.SortKeyEnc, err)
}
valueStr, err := ctx.ValueEnc.DecodeAll(value)
if err != nil {
bytesEnc := util.NewEncoder("javabytes")
valueStr, _ := bytesEnc.DecodeAll(value)
return fmt.Errorf("Value can not be decoded in %s: %s [SortKey: \"%s\"]\nValue: [JAVABYTES]\n%s", ctx.ValueEnc, err, sortKey, valueStr)
}
fmt.Fprintf(ctx, "%s : %s : %s\n", hashKeyStr, sortkeyStr, valueStr)
return nil
}