forked from jehiah/gomrjob
/
protocol.go
274 lines (262 loc) · 6.52 KB
/
protocol.go
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package gomrjob
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"github.com/bitly/go-simplejson"
"io"
"log"
"sync"
)
// returns a channel of simplejson.Json objects. This channel will be closed
// when the input stream closes. Errors will be logged
func JsonInputProtocol(input io.Reader) <-chan *simplejson.Json {
out := make(chan *simplejson.Json, 100)
go func() {
var line []byte
var lineErr error
r := bufio.NewReaderSize(input, 1024*1024*2)
for {
if lineErr == io.EOF {
break
}
line, lineErr = r.ReadBytes('\n')
if len(line) <= 1 {
continue
}
data, err := simplejson.NewJson(line)
if err != nil {
Counter("JsonInputProtocol", "invalid line", 1)
log.Printf("%s - failed parsing %s", err, line)
} else {
out <- data
}
}
close(out)
}()
return out
}
type JsonKeyChan struct {
Key *simplejson.Json
Values <-chan *simplejson.Json
}
// returns an input channel with a simplejson.Json key, and a channel of simplejson.Json Values which includes the key
// Each channel will be closed when no data is finished. Errors will be logged
func JsonInternalInputProtocol(input io.Reader) <-chan JsonKeyChan {
out := make(chan JsonKeyChan)
var jsonChan chan *simplejson.Json
go func() {
var line []byte
var lineErr error
r := bufio.NewReaderSize(input, 1024*1024*2)
var lastKey []byte
for {
if lineErr == io.EOF {
break
}
line, lineErr = r.ReadBytes('\n')
if len(line) <= 1 {
continue
}
chunks := bytes.SplitN(line, []byte("\t"), 2)
if len(chunks) != 2 {
Counter("JsonInternalInputProtocol", "invalid line - no tab", 1)
log.Printf("invalid line. no tab - %s", line)
lastKey = lastKey[:0]
continue
}
if !bytes.Equal(chunks[0], lastKey) {
if jsonChan != nil {
close(jsonChan)
jsonChan = nil
}
key, err := simplejson.NewJson(chunks[0])
if err != nil {
Counter("JsonInternalInputProtocol", "invalid line", 1)
log.Printf("%s - failed parsing key %s", err, line)
continue
}
lastKey = chunks[0]
jsonChan = make(chan *simplejson.Json, 100)
out <- JsonKeyChan{key, jsonChan}
}
data, err := simplejson.NewJson(chunks[1])
if err != nil {
Counter("JsonInternalInputProtocol", "invalid line", 1)
log.Printf("%s - failed parsing %s", err, line)
} else {
jsonChan <- data
}
}
if jsonChan != nil {
close(jsonChan)
}
close(out)
}()
return out
}
type RawJsonKeyChan struct {
Key []byte
Values <-chan *simplejson.Json
}
// returns an input channel with a simplejson.Json key, and a channel of simplejson.Json Values which includes the key
// Each channel will be closed when no data is finished. Errors will be logged
func RawJsonInternalInputProtocol(input io.Reader) <-chan RawJsonKeyChan {
out := make(chan RawJsonKeyChan)
var jsonChan chan *simplejson.Json
go func() {
var line []byte
var lineErr error
r := bufio.NewReaderSize(input, 1024*1024*2)
var lastKey []byte
for {
if lineErr == io.EOF {
break
}
line, lineErr = r.ReadBytes('\n')
if len(line) <= 1 {
continue
}
chunks := bytes.SplitN(line, []byte("\t"), 2)
if len(chunks) != 2 {
Counter("RawJsonInternalInputProtocol", "invalid line - no tab", 1)
log.Printf("invalid line. no tab - %s", line)
lastKey = lastKey[:0]
continue
}
if !bytes.Equal(chunks[0], lastKey) {
if jsonChan != nil {
close(jsonChan)
jsonChan = nil
}
lastKey = chunks[0]
jsonChan = make(chan *simplejson.Json, 100)
out <- RawJsonKeyChan{lastKey, jsonChan}
}
data, err := simplejson.NewJson(chunks[1])
if err != nil {
Counter("RawJsonInternalInputProtocol", "invalid line", 1)
log.Printf("%s - failed parsing %s", err, line)
} else {
jsonChan <- data
}
}
if jsonChan != nil {
close(jsonChan)
}
close(out)
}()
return out
}
// returns an input channel with a raw key, value without collating keys
func RawInternalInputProtocol(input io.Reader) <-chan KeyValue {
out := make(chan KeyValue, 100)
go func() {
var line []byte
var lineErr error
r := bufio.NewReaderSize(input, 1024*1024*2)
var lastKey []byte
for {
if lineErr == io.EOF {
break
}
line, lineErr = r.ReadBytes('\n')
if len(line) <= 1 {
continue
}
chunks := bytes.SplitN(line, []byte("\t"), 2)
if len(chunks) != 2 {
Counter("RawInternalInputProtocol", "invalid line - no tab", 1)
log.Printf("invalid line. no tab - %s", line)
lastKey = lastKey[:0]
continue
}
out <- KeyValue{chunks[0], chunks[1]}
}
close(out)
}()
return out
}
type KeyValue struct {
Key interface{}
Value interface{}
}
func RawKeyValueOutputProtocol(writer io.Writer) (*sync.WaitGroup, chan<- KeyValue) {
w := bufio.NewWriter(writer)
in := make(chan KeyValue, 100)
var wg sync.WaitGroup
wg.Add(1)
go func() {
for kv := range in {
fmt.Fprintf(w, "%+v\t%+v\n", kv.Key, kv.Value)
}
w.Flush()
wg.Done()
}()
return &wg, in
}
// a json Key, and a json value
func JsonInternalOutputProtocol(writer io.Writer) (*sync.WaitGroup, chan<- KeyValue) {
w := bufio.NewWriter(writer)
in := make(chan KeyValue, 100)
tab := []byte("\t")
newline := []byte("\n")
var wg sync.WaitGroup
wg.Add(1)
go func() {
for kv := range in {
kBytes, err := json.Marshal(kv.Key)
if err != nil {
Counter("JsonInternalOutputProtocol", "unable to json encode key", 1)
log.Printf("%s - failed encoding %v", err, kv.Key)
continue
}
vBytes, err := json.Marshal(kv.Value)
if err != nil {
Counter("JsonInternalOutputProtocol", "unable to json encode value", 1)
log.Printf("%s - failed encoding %v", err, kv.Value)
continue
}
w.Write(kBytes)
w.Write(tab)
w.Write(vBytes)
w.Write(newline)
}
w.Flush()
wg.Done()
}()
return &wg, in
}
// a raw byte Key, and a json value
func RawJsonInternalOutputProtocol(writer io.Writer) (*sync.WaitGroup, chan<- KeyValue) {
w := bufio.NewWriter(writer)
in := make(chan KeyValue, 100)
tab := []byte("\t")
newline := []byte("\n")
var wg sync.WaitGroup
wg.Add(1)
go func() {
for kv := range in {
kBytes, ok := kv.Key.([]byte)
if !ok {
Counter("RawJsonInternalOutputProtocol", "key is not []byte", 1)
log.Printf("failed type casting %v", kv.Key)
continue
}
vBytes, err := json.Marshal(kv.Value)
if err != nil {
Counter("RawJsonInternalOutputProtocol", "unable to json encode value", 1)
log.Printf("%s - failed encoding %v", err, kv.Value)
continue
}
w.Write(kBytes)
w.Write(tab)
w.Write(vBytes)
w.Write(newline)
}
w.Flush()
wg.Done()
}()
return &wg, in
}