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|
package clients
import (
"context"
"errors"
"fmt"
"runtime"
"strings"
"time"
"github.com/mimecast/dtail/internal/clients/handlers"
"github.com/mimecast/dtail/internal/io/logger"
"github.com/mimecast/dtail/internal/mapr"
"github.com/mimecast/dtail/internal/omode"
)
type MaprClientMode int
const (
DefaultMode MaprClientMode = iota
CumulativeMode MaprClientMode = iota
NonCumulativeMode MaprClientMode = iota
)
// MaprClient is used for running mapreduce aggregations on remote files.
type MaprClient struct {
baseClient
// Query string for mapr aggregations
queryStr string
// Global group set for merged mapr aggregation results
globalGroup *mapr.GlobalGroupSet
// The query object (constructed from queryStr)
query *mapr.Query
// Additative result or new result every interval run?
cumulative bool
}
// NewMaprClient returns a new mapreduce client.
func NewMaprClient(args Args, queryStr string, maprClientMode MaprClientMode) (*MaprClient, error) {
if queryStr == "" {
return nil, errors.New("No mapreduce query specified, use '-query' flag")
}
query, err := mapr.NewQuery(queryStr)
if err != nil {
logger.FatalExit(queryStr, "Can't parse mapr query", err)
}
// Don't retry connection if in tail mode and no outfile specified.
retry := args.Mode == omode.TailClient && !query.HasOutfile()
var cumulative bool
switch maprClientMode {
case CumulativeMode:
cumulative = true
case NonCumulativeMode:
cumulative = false
default:
// Result is comulative if we are in MapClient mode or with outfile
cumulative = args.Mode == omode.MapClient || query.HasOutfile()
}
c := MaprClient{
baseClient: baseClient{
Args: args,
throttleCh: make(chan struct{}, args.ConnectionsPerCPU*runtime.NumCPU()),
retry: retry,
},
query: query,
queryStr: queryStr,
cumulative: cumulative,
}
switch c.query.Table {
case "", ".":
c.Regex = "."
case "*":
c.Regex = fmt.Sprintf("\\|MAPREDUCE:\\|")
default:
c.Regex = fmt.Sprintf("\\|MAPREDUCE:%s\\|", c.query.Table)
}
c.globalGroup = mapr.NewGlobalGroupSet()
c.baseClient.init(c)
return &c, nil
}
// Start starts the mapreduce client.
func (c *MaprClient) Start(ctx context.Context) (status int) {
go c.periodicReportResults(ctx)
status = c.baseClient.Start(ctx)
if c.cumulative {
logger.Info("Received final mapreduce result")
c.reportResults()
}
return
}
func (c MaprClient) makeHandler(server string) handlers.Handler {
return handlers.NewMaprHandler(server, c.query, c.globalGroup)
}
func (c MaprClient) makeCommands() (commands []string) {
commands = append(commands, fmt.Sprintf("map %s", c.query.RawQuery))
modeStr := "cat"
if c.Mode == omode.TailClient {
modeStr = "tail"
}
for _, file := range strings.Split(c.What, ",") {
if c.Timeout > 0 {
commands = append(commands, fmt.Sprintf("timeout %d %s %s regex %s", c.Timeout, modeStr, file, c.Regex))
continue
}
commands = append(commands, fmt.Sprintf("%s %s regex %s", modeStr, file, c.Regex))
}
return
}
func (c *MaprClient) periodicReportResults(ctx context.Context) {
for {
select {
case <-time.After(c.query.Interval):
logger.Info("Gathering interim mapreduce result")
c.reportResults()
case <-ctx.Done():
return
}
}
}
func (c *MaprClient) reportResults() {
if c.query.HasOutfile() {
c.writeResultsToOutfile()
return
}
c.printResults()
}
func (c *MaprClient) printResults() {
var result string
var err error
var numLines int
if c.cumulative {
result, numLines, err = c.globalGroup.Result(c.query)
} else {
result, numLines, err = c.globalGroup.SwapOut().Result(c.query)
}
if err != nil {
logger.FatalExit(err)
}
if numLines == 0 {
logger.Info("Empty result set this time...")
return
}
logger.Raw(fmt.Sprintf("%s\n", c.query.RawQuery))
logger.Raw(result)
}
func (c *MaprClient) writeResultsToOutfile() {
if c.cumulative {
if err := c.globalGroup.WriteResult(c.query); err != nil {
logger.FatalExit(err)
}
return
}
if err := c.globalGroup.SwapOut().WriteResult(c.query); err != nil {
logger.FatalExit(err)
}
}
|
