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mongoexport.go
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mongoexport.go
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// Copyright (C) MongoDB, Inc. 2014-present.
//
// 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
// Main package for the mongoexport tool.
package main
import (
"os"
"github.com/huimingz/mongo-tools/common/log"
"github.com/huimingz/mongo-tools/common/signals"
"github.com/huimingz/mongo-tools/common/util"
"github.com/huimingz/mongo-tools/mongoexport"
)
var (
VersionStr = "built-without-version-string"
GitCommit = "build-without-git-commit"
)
func main() {
opts, err := mongoexport.ParseOptions(os.Args[1:], VersionStr, GitCommit)
if err != nil {
log.Logvf(log.Always, "error parsing command line options: %v", err)
log.Logvf(log.Always, util.ShortUsage("mongoexport"))
os.Exit(util.ExitFailure)
}
signals.Handle()
// print help, if specified
if opts.PrintHelp(false) {
return
}
// print version, if specified
if opts.PrintVersion() {
return
}
exporter, err := mongoexport.New(opts)
if err != nil {
log.Logvf(log.Always, "%v", err)
if se, ok := err.(util.SetupError); ok && se.Message != "" {
log.Logv(log.Always, se.Message)
}
os.Exit(util.ExitFailure)
}
defer exporter.Close()
writer, err := exporter.GetOutputWriter()
if err != nil {
log.Logvf(log.Always, "error opening output stream: %v", err)
os.Exit(util.ExitFailure)
}
if writer == nil {
writer = os.Stdout
} else {
defer writer.Close()
}
numDocs, err := exporter.Export(writer)
if err != nil {
log.Logvf(log.Always, "Failed: %v", err)
os.Exit(util.ExitFailure)
}
if numDocs == 1 {
log.Logvf(log.Always, "exported %v record", numDocs)
} else {
log.Logvf(log.Always, "exported %v records", numDocs)
}
}