/
mapper.go
171 lines (143 loc) · 3.08 KB
/
mapper.go
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// ====================================================================================
// Copyright (c) 2012, ioriiod0@gmail.com All rights reserved.
// File : mapper.go
// Author : ioriiod0@gmail.com
// Last Change : 10/30/2012 11:55 PM
// Description :
// ====================================================================================
package main
import (
"bufio"
"encoding/gob"
"encoding/json"
"flag"
"fmt"
"hash/crc32"
"io"
"log"
"net"
"os"
"runtime"
"strconv"
"strings"
)
func open_input_files(in io.Reader) ([]io.Reader, error) {
var ret []io.Reader
rd := bufio.NewReader(in)
for {
if file_name, err := rd.ReadString('\n'); err != nil {
if err == io.EOF {
break
} else {
return nil, err
}
} else {
if file, err := os.Open(file_name); err != nil {
return nil, err
} else {
ret = append(ret, file)
}
}
}
return ret, nil
}
func open_output_files(size uint32) ([]io.Writer, error) {
ret := make([]io.Writer, size)
for i := uint32(0); i < size; i += 1 {
file, err := os.OpenFile(string(i)+".txt", os.O_TRUNC|os.O_APPEND|os.O_CREATE, 0666)
if err != nil {
return nil, err
} else {
ret[i] = file
}
}
return ret, nil
}
func mapper(id int, in io.Reader, outs []io.Writer, signals chan int) {
defer func() {
if err := recover(); err != nil {
log.Println(err)
}
signals <- id
}()
rd := bufio.NewReader(in)
size := len(outs)
wds := make([]*bufio.Writer, size, size)
for i, out := range outs {
wds[i] = bufio.NewWriter(out)
}
for {
if line, err := rd.ReadString('\n'); err != nil {
if err == io.EOF {
break
} else {
log.Panicln(err)
}
} else {
index := crc32.ChecksumIEEE([]byte(line)) % uint32(size) //hash
if _, err := wds[index].WriteString(line); err != nil {
log.Panicln(err)
}
}
}
}
var (
config_file_path = flag.String("config", "config.json", "config file path")
num_of_cpus = flag.Uint("cpus", runtime.NumCPU(), "num of cpus")
)
type Config struct {
inputs, workers []string
}
func load_config(file_name string) (*Config, error) {
file, err := os.Open(file_name)
if err != nil {
return nil, err
}
dec := json.NewDecoder(file)
config = new(Config)
if err := dec.Decode(config); err != nil {
return nil, err
}
return config, nil
}
type Package int8
type Worker struct {
addr string
enc *gob.Encoder
}
type Job struct {
signal chan bool
input string
workers string
}
func main() {
flag.Parse()
runtime.GOMAXPROCS(num_of_cpus)
log.SetOutput(os.Stderr)
config, err := load_config(config_file_path)
if err != nil {
log.Fataln(err)
}
inputs, err := open_inputs(config.inputs)
if err != nil {
log.Fatalln(err)
}
outputs, err := open_outputs(config.outputs)
if err != nil {
log.Fatalln(err)
}
num_of_workers := len(inputs)
signals := make(chan int, num_of_workers)
defer func() {
close(signals)
}()
for id, input := range inputs {
go mapper(id, input, outputs, signals)
}
for i := 0; i < num_of_workers; i += 1 {
<-signals
}
for i := uint32(0); i < num_of_outputs; i += 1 {
fmt.Println(string(i) + ".txt")
}
}