add new fields command to zap cmd-line util
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index/scorch/segment/zap/cmd/zap/cmd/fields.go
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70
index/scorch/segment/zap/cmd/zap/cmd/fields.go
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// Copyright (c) 2017 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cmd
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import (
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"encoding/binary"
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"fmt"
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"github.com/blevesearch/bleve/index/scorch/segment/zap"
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"github.com/spf13/cobra"
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)
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// fieldsCmd represents the fields command
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var fieldsCmd = &cobra.Command{
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Use: "fields [path]",
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Short: "fields prints the fields in the specified file",
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Long: `The fields command lets you print the fields in the specified file.`,
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RunE: func(cmd *cobra.Command, args []string) error {
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data := segment.Data()
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crcOffset := len(data) - 4
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verOffset := crcOffset - 4
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chunkOffset := verOffset - 4
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fieldsOffset := chunkOffset - 8
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fieldsIndexOffset := binary.BigEndian.Uint64(data[fieldsOffset : fieldsOffset+8])
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fieldsIndexEnd := uint64(len(data) - zap.FooterSize)
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// iterate through fields index
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var fieldID uint64
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for fieldsIndexOffset+(8*fieldID) < fieldsIndexEnd {
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addr := binary.BigEndian.Uint64(data[fieldsIndexOffset+(8*fieldID) : fieldsIndexOffset+(8*fieldID)+8])
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var n uint64
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indexedLoc, read := binary.Uvarint(data[addr:fieldsIndexEnd])
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n += uint64(read)
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var dictLoc uint64
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dictLoc, read = binary.Uvarint(data[addr+n : fieldsIndexEnd])
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n += uint64(read)
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var nameLen uint64
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nameLen, read = binary.Uvarint(data[addr+n : fieldsIndexEnd])
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n += uint64(read)
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name := string(data[addr+n : addr+n+nameLen])
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fmt.Printf("field %d '%s' indexedLoc: %t starts at %d (%x)\n", fieldID, name, indexedLoc == 1, dictLoc, dictLoc)
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fieldID++
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}
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return nil
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},
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}
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func init() {
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RootCmd.AddCommand(fieldsCmd)
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}
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