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export.go
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export.go
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// Copyright 2022 Molecula Corp. (DBA FeatureBase).
// SPDX-License-Identifier: Apache-2.0
package ctl
import (
"context"
"fmt"
"io"
"os"
pilosa "github.com/featurebasedb/featurebase/v3"
"github.com/featurebasedb/featurebase/v3/logger"
"github.com/featurebasedb/featurebase/v3/server"
"github.com/pkg/errors"
)
// ExportCommand represents a command for bulk exporting data from a server.
type ExportCommand struct {
// Remote host and port.
Host string
// Name of the index & field to export from.
Index string
Field string
// Filename to export to.
Path string
// Standard input/output
logDest logger.Logger
TLS server.TLSConfig
}
// Logger returns the command's associated Logger to maintain CommandWithTLSSupport interface compatibility
func (cmd *ExportCommand) Logger() logger.Logger {
return cmd.logDest
}
// NewExportCommand returns a new instance of ExportCommand.
func NewExportCommand(logdest logger.Logger) *ExportCommand {
return &ExportCommand{
logDest: logdest,
}
}
// Run executes the export.
func (cmd *ExportCommand) Run(ctx context.Context) error {
logger := cmd.Logger()
// Validate arguments.
if cmd.Index == "" {
return fmt.Errorf("%w: %v", UsageError, pilosa.ErrIndexRequired)
} else if cmd.Field == "" {
return fmt.Errorf("%w: %v", UsageError, pilosa.ErrFieldRequired)
}
// Use output file, if specified.
// Otherwise use STDOUT.
var w io.Writer = os.Stdout
if cmd.Path != "" {
f, err := os.Create(cmd.Path)
if err != nil {
return errors.Wrap(err, "creating file")
}
defer f.Close()
w = f
}
// Create a client to the server.
client, err := commandClient(cmd)
if err != nil {
return errors.Wrap(err, "creating client")
}
// Determine shard count.
maxShards, err := client.MaxShardByIndex(ctx)
if err != nil {
return errors.Wrap(err, "getting shard count")
}
// Export each shard.
for shard := uint64(0); shard <= maxShards[cmd.Index]; shard++ {
logger.Printf("exporting shard: %d", shard)
if err := client.ExportCSV(ctx, cmd.Index, cmd.Field, shard, w); err != nil {
return errors.Wrap(err, "exporting")
}
}
return nil
}
func (cmd *ExportCommand) TLSHost() string {
return cmd.Host
}
func (cmd *ExportCommand) TLSConfiguration() server.TLSConfig {
return cmd.TLS
}