mirror of
https://github.com/featurebasedb/featurebase.git
synced 2026-08-28 02:44:59 +00:00
144 lines
3.5 KiB
Go
144 lines
3.5 KiB
Go
// Copyright 2022 Molecula Corp. (DBA FeatureBase).
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// SPDX-License-Identifier: Apache-2.0
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package ctl
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import (
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"context"
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"fmt"
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"io"
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"os"
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"github.com/featurebasedb/featurebase/v3/logger"
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"github.com/featurebasedb/featurebase/v3/rbf"
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"github.com/featurebasedb/featurebase/v3/txkey"
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)
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// RBFPagesCommand represents a command for printing a list of RBF page metadata.
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type RBFPagesCommand struct {
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// Filepath to the RBF database.
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Path string
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// Print the b-tree key with each row.
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WithTree bool
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// Standard input/output
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stdout io.Writer
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logDest logger.Logger
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}
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// NewRBFPagesCommand returns a new instance of RBFPagesCommand.
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func NewRBFPagesCommand(logdest logger.Logger) *RBFPagesCommand {
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return &RBFPagesCommand{
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stdout: os.Stdout,
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logDest: logdest,
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}
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}
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// Run executes the export.
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func (cmd *RBFPagesCommand) Run(ctx context.Context) error {
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// Open database.
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db := rbf.NewDB(cmd.Path, nil)
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if err := db.Open(); err != nil {
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return err
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}
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defer db.Close()
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// Execute with a transaction.
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tx, err := db.Begin(false)
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if err != nil {
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return err
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}
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defer tx.Rollback()
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// Iterate over each page and grab info.
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infos, err := tx.PageInfos()
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if err != nil {
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fmt.Fprintln(cmd.stdout, "ERRORS:")
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switch err := err.(type) {
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case rbf.ErrorList:
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for i := range err {
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fmt.Fprintln(cmd.stdout, err[i])
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}
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default:
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fmt.Fprintln(cmd.stdout, err)
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}
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fmt.Fprintln(cmd.stdout, "")
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}
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// Write header.
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fmt.Fprint(cmd.stdout, "ID ")
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fmt.Fprint(cmd.stdout, "TYPE ")
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if cmd.WithTree {
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fmt.Fprint(cmd.stdout, "TREE ")
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}
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fmt.Fprintln(cmd.stdout, "EXTRA")
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fmt.Fprint(cmd.stdout, "======== ")
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fmt.Fprint(cmd.stdout, "========== ")
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if cmd.WithTree {
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fmt.Fprint(cmd.stdout, "============================== ")
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}
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fmt.Fprintln(cmd.stdout, "====================")
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// Print one line for each page.
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for pgno, info := range infos {
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fmt.Fprintf(cmd.stdout, "%-8d ", pgno)
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switch info := info.(type) {
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case *rbf.MetaPageInfo:
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fmt.Fprintf(cmd.stdout, "%-10s ", "meta")
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if cmd.WithTree {
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fmt.Fprintf(cmd.stdout, "%-30q ", "")
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}
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fmt.Fprintf(cmd.stdout, "pageN=%d,walid=%d,rootrec=%d,freelist=%d\n", info.PageN, info.WALID, info.RootRecordPageNo, info.FreelistPageNo)
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case *rbf.RootRecordPageInfo:
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fmt.Fprintf(cmd.stdout, "%-10s ", "rootrec")
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if cmd.WithTree {
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fmt.Fprintf(cmd.stdout, "%-30q ", "")
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}
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fmt.Fprintf(cmd.stdout, "next=%d\n", info.Next)
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case *rbf.LeafPageInfo:
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fmt.Fprintf(cmd.stdout, "%-10s ", "leaf")
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if cmd.WithTree {
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fmt.Fprintf(cmd.stdout, "%-30q ", prefixToString(info.Tree))
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}
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fmt.Fprintf(cmd.stdout, "flags=x%x,celln=%d\n", info.Flags, info.CellN)
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case *rbf.BranchPageInfo:
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fmt.Fprintf(cmd.stdout, "%-10s ", "branch")
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if cmd.WithTree {
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fmt.Fprintf(cmd.stdout, "%-30q ", prefixToString(info.Tree))
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}
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fmt.Fprintf(cmd.stdout, "flags=x%x,celln=%d\n", info.Flags, info.CellN)
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case *rbf.BitmapPageInfo:
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fmt.Fprintf(cmd.stdout, "%-10s ", "bitmap")
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if cmd.WithTree {
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fmt.Fprintf(cmd.stdout, "%-30q ", prefixToString(info.Tree))
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}
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fmt.Fprintf(cmd.stdout, "-\n")
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case *rbf.FreePageInfo:
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fmt.Fprintf(cmd.stdout, "%-10s ", "free")
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if cmd.WithTree {
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fmt.Fprintf(cmd.stdout, "%-30q ", "")
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}
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fmt.Fprintf(cmd.stdout, "-\n")
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default:
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fmt.Fprintf(cmd.stdout, "unknown [%T]\n", info)
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}
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}
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return nil
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}
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func prefixToString(s string) (ret string) {
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defer func() {
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if err := recover(); err != nil {
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ret = s
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}
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}()
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return txkey.PrefixToString([]byte(s))
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}
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