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// Main package for the mongotop tool.
package main
import (
"github.com/mongodb/mongo-tools/common/db"
"github.com/mongodb/mongo-tools/common/log"
"github.com/mongodb/mongo-tools/common/options"
"github.com/mongodb/mongo-tools/common/signals"
"github.com/mongodb/mongo-tools/common/util"
"github.com/mongodb/mongo-tools/mongotop"
"gopkg.in/mgo.v2"
"os"
"strconv"
"time"
)
func main() {
// initialize command-line opts
opts := options.New("mongotop", mongotop.Usage,
options.EnabledOptions{Auth: true, Connection: true, Namespace: false, URI: true})
opts.UseReadOnlyHostDescription()
// add mongotop-specific options
outputOpts := &mongotop.Output{}
opts.AddOptions(outputOpts)
args, err := opts.ParseArgs(os.Args[1:])
if err != nil {
log.Logvf(log.Always, "error parsing command line options: %v", err)
log.Logvf(log.Always, "try 'mongotop --help' for more information")
os.Exit(util.ExitBadOptions)
}
// print help, if specified
if opts.PrintHelp(false) {
return
}
// print version, if specified
if opts.PrintVersion() {
return
}
log.SetVerbosity(opts.Verbosity)
signals.Handle()
// verify uri options and log them
opts.URI.LogUnsupportedOptions()
if len(args) > 1 {
log.Logvf(log.Always, "too many positional arguments")
log.Logvf(log.Always, "try 'mongotop --help' for more information")
os.Exit(util.ExitBadOptions)
}
sleeptime := 1 // default to 1 second sleep time
if len(args) > 0 {
sleeptime, err = strconv.Atoi(args[0])
if err != nil || sleeptime <= 0 {
log.Logvf(log.Always, "invalid sleep time: %v", args[0])
os.Exit(util.ExitBadOptions)
}
}
if outputOpts.RowCount < 0 {
log.Logvf(log.Always, "invalid value for --rowcount: %v", outputOpts.RowCount)
os.Exit(util.ExitBadOptions)
}
if opts.Auth.Username != "" && opts.Auth.Source == "" && !opts.Auth.RequiresExternalDB() {
if opts.URI != nil && opts.URI.ConnectionString != "" {
log.Logvf(log.Always, "authSource is required when authenticating against a non $external database")
os.Exit(util.ExitBadOptions)
}
log.Logvf(log.Always, "--authenticationDatabase is required when authenticating against a non $external database")
os.Exit(util.ExitBadOptions)
}
// create a session provider to connect to the db
sessionProvider, err := db.NewSessionProvider(*opts)
if err != nil {
log.Logvf(log.Always, "error connecting to host: %v", err)
os.Exit(util.ExitError)
}
if opts.ReplicaSetName == "" {
sessionProvider.SetReadPreference(mgo.PrimaryPreferred)
}
// fail fast if connecting to a mongos
isMongos, err := sessionProvider.IsMongos()
if err != nil {
log.Logvf(log.Always, "Failed: %v", err)
os.Exit(util.ExitError)
}
if isMongos {
log.Logvf(log.Always, "cannot run mongotop against a mongos")
os.Exit(util.ExitError)
}
// instantiate a mongotop instance
top := &mongotop.MongoTop{
Options: opts,
OutputOptions: outputOpts,
SessionProvider: sessionProvider,
Sleeptime: time.Duration(sleeptime) * time.Second,
}
// kick it off
if err := top.Run(); err != nil {
log.Logvf(log.Always, "Failed: %v", err)
os.Exit(util.ExitError)
}
}
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