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/
export.go
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/
export.go
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// Copyright 2017 Pilosa Corp.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ctl
import (
"context"
"io"
"os"
"github.com/pilosa/pilosa/v2"
"github.com/pilosa/pilosa/v2/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
*pilosa.CmdIO
TLS server.TLSConfig
}
// NewExportCommand returns a new instance of ExportCommand.
func NewExportCommand(stdin io.Reader, stdout, stderr io.Writer) *ExportCommand {
return &ExportCommand{
CmdIO: pilosa.NewCmdIO(stdin, stdout, stderr),
}
}
// Run executes the export.
func (cmd *ExportCommand) Run(ctx context.Context) error {
logger := cmd.Logger()
// Validate arguments.
if cmd.Index == "" {
return pilosa.ErrIndexRequired
} else if cmd.Field == "" {
return pilosa.ErrFieldRequired
}
// Use output file, if specified.
// Otherwise use STDOUT.
var w io.Writer = cmd.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")
}
}
// Close writer, if applicable.
if w, ok := w.(io.Closer); ok {
if err := w.Close(); err != nil {
return errors.Wrap(err, "closing")
}
}
return nil
}
func (cmd *ExportCommand) TLSHost() string {
return cmd.Host
}
func (cmd *ExportCommand) TLSConfiguration() server.TLSConfig {
return cmd.TLS
}