mirror of
https://github.com/featurebasedb/featurebase.git
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128 lines
3.6 KiB
Go
128 lines
3.6 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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pilosa "github.com/featurebasedb/featurebase/v3"
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"github.com/featurebasedb/featurebase/v3/rbf"
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)
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// RBFPageCommand represents a command for printing data for a single RBF page.
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type RBFPageCommand struct {
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// Filepath to the RBF database.
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Path string
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// Page numbers to print.
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Pgnos []uint32
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// Standard input/output
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*pilosa.CmdIO
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}
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// NewRBFPageCommand returns a new instance of RBFPageCommand.
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func NewRBFPageCommand(stdin io.Reader, stdout, stderr io.Writer) *RBFPageCommand {
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return &RBFPageCommand{
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CmdIO: pilosa.NewCmdIO(stdin, stdout, stderr),
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}
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}
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// Run executes the export.
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func (cmd *RBFPageCommand) 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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// Fetch the page.
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pages, err := tx.Pages(cmd.Pgnos)
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if err != nil {
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return err
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}
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for _, page := range pages {
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switch page := page.(type) {
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case *rbf.MetaPage:
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cmd.printMetaPage(page)
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case *rbf.RootRecordPage:
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cmd.printRootRecordPage(page)
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case *rbf.LeafPage:
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cmd.printLeafPage(page)
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case *rbf.BranchPage:
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cmd.printBranchPage(page)
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case *rbf.BitmapPage:
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cmd.printBitmapPage(page)
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case *rbf.FreePage:
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cmd.printFreePage(page)
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default:
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return fmt.Errorf("unexpected page type %T", page)
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}
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fmt.Fprintln(cmd.Stdout, "")
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}
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return nil
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}
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func (cmd *RBFPageCommand) printMetaPage(page *rbf.MetaPage) {
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fmt.Fprintf(cmd.Stdout, "Pgno: %d\n", page.Pgno)
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fmt.Fprintf(cmd.Stdout, "Type: meta\n")
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fmt.Fprintf(cmd.Stdout, "PageN: %d\n", page.PageN)
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fmt.Fprintf(cmd.Stdout, "WALID: %d\n", page.WALID)
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fmt.Fprintf(cmd.Stdout, "Root Record Pgno: %d\n", page.RootRecordPageNo)
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fmt.Fprintf(cmd.Stdout, "Freelist Pgno: %d\n", page.FreelistPageNo)
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}
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func (cmd *RBFPageCommand) printRootRecordPage(page *rbf.RootRecordPage) {
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fmt.Fprintf(cmd.Stdout, "Pgno: %d\n", page.Pgno)
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fmt.Fprintf(cmd.Stdout, "Type: root record\n")
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fmt.Fprintf(cmd.Stdout, "Next: %d\n", page.Next)
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fmt.Fprintf(cmd.Stdout, "Records: n=%d\n", len(page.Records))
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for i, rec := range page.Records {
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fmt.Fprintf(cmd.Stdout, "[%d]: name=%q pgno=%d\n", i, rec.Name, rec.Pgno)
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}
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}
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func (cmd *RBFPageCommand) printLeafPage(page *rbf.LeafPage) {
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fmt.Fprintf(cmd.Stdout, "Pgno: %d\n", page.Pgno)
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fmt.Fprintf(cmd.Stdout, "Type: leaf\n")
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fmt.Fprintf(cmd.Stdout, "Cells: n=%d\n", len(page.Cells))
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for i, cell := range page.Cells {
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if cell.Type == rbf.ContainerTypeBitmapPtr {
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fmt.Fprintf(cmd.Stdout, "[%d]: key=%d type=%s pgno=%d\n", i, cell.Key, cell.Type, cell.Pgno)
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} else {
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fmt.Fprintf(cmd.Stdout, "[%d]: key=%d type=%s values=%v\n", i, cell.Key, cell.Type, cell.Values)
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}
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}
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}
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func (cmd *RBFPageCommand) printBranchPage(page *rbf.BranchPage) {
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fmt.Fprintf(cmd.Stdout, "Pgno: %d\n", page.Pgno)
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fmt.Fprintf(cmd.Stdout, "Type: branch\n")
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fmt.Fprintf(cmd.Stdout, "Cells: n=%d\n", len(page.Cells))
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for i, cell := range page.Cells {
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fmt.Fprintf(cmd.Stdout, "[%d]: key=%d flags=%d pgno=%d\n", i, cell.Key, cell.Flags, cell.Pgno)
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}
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}
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func (cmd *RBFPageCommand) printBitmapPage(page *rbf.BitmapPage) {
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fmt.Fprintf(cmd.Stdout, "Pgno: %d\n", page.Pgno)
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fmt.Fprintf(cmd.Stdout, "Type: bitmap\n")
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fmt.Fprintf(cmd.Stdout, "Values: %v\n", page.Values)
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}
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func (cmd *RBFPageCommand) printFreePage(page *rbf.FreePage) {
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fmt.Fprintf(cmd.Stdout, "Pgno: %d\n", page.Pgno)
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fmt.Fprintf(cmd.Stdout, "Type: free\n")
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}
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