mirror of
https://github.com/featurebasedb/featurebase.git
synced 2026-08-28 02:44:59 +00:00
112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
// Copyright 2017 Pilosa Corp.
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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 ctl
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import (
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"context"
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"io"
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"os"
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"github.com/pilosa/pilosa/v2"
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"github.com/pilosa/pilosa/v2/server"
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"github.com/pkg/errors"
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)
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// ExportCommand represents a command for bulk exporting data from a server.
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type ExportCommand struct {
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// Remote host and port.
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Host string
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// Name of the index & field to export from.
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Index string
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Field string
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// Filename to export to.
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Path string
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// Standard input/output
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*pilosa.CmdIO
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TLS server.TLSConfig
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}
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// NewExportCommand returns a new instance of ExportCommand.
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func NewExportCommand(stdin io.Reader, stdout, stderr io.Writer) *ExportCommand {
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return &ExportCommand{
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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 *ExportCommand) Run(ctx context.Context) error {
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logger := cmd.Logger()
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// Validate arguments.
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if cmd.Index == "" {
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return pilosa.ErrIndexRequired
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} else if cmd.Field == "" {
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return pilosa.ErrFieldRequired
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}
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// Use output file, if specified.
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// Otherwise use STDOUT.
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var w io.Writer = cmd.Stdout
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if cmd.Path != "" {
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f, err := os.Create(cmd.Path)
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if err != nil {
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return errors.Wrap(err, "creating file")
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}
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defer f.Close()
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w = f
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}
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// Create a client to the server.
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client, err := commandClient(cmd)
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if err != nil {
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return errors.Wrap(err, "creating client")
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}
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// Determine shard count.
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maxShards, err := client.MaxShardByIndex(ctx)
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if err != nil {
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return errors.Wrap(err, "getting shard count")
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}
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// Export each shard.
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for shard := uint64(0); shard <= maxShards[cmd.Index]; shard++ {
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logger.Printf("exporting shard: %d", shard)
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if err := client.ExportCSV(ctx, cmd.Index, cmd.Field, shard, w); err != nil {
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return errors.Wrap(err, "exporting")
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}
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}
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// Close writer, if applicable.
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if w, ok := w.(io.Closer); ok {
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if err := w.Close(); err != nil {
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return errors.Wrap(err, "closing")
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}
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}
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return nil
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}
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func (cmd *ExportCommand) TLSHost() string {
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return cmd.Host
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}
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func (cmd *ExportCommand) TLSConfiguration() server.TLSConfig {
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return cmd.TLS
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}
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