/
data_savers.go
254 lines (208 loc) · 4.58 KB
/
data_savers.go
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package main
import (
"compress/gzip"
"encoding/gob"
"github.com/jcla1/matrix"
"io"
"os"
)
func LoadMatrixFromFile(path string) *matrix.Matrix {
file, err := os.Open(path)
if err != nil {
panic(err)
}
return LoadMatrix(file)
}
func LoadMatrix(r io.Reader) *matrix.Matrix {
var m *matrix.Matrix
decoder := gob.NewDecoder(r)
err := decoder.Decode(&m)
if err != nil {
panic(err)
}
return m
}
func SaveMatrixToFile(m *matrix.Matrix, path string) {
file, err := os.Create(path)
if err != nil {
panic(err)
}
SaveMatrix(m, file)
}
func SaveMatrix(m *matrix.Matrix, w io.Writer) {
encoder := gob.NewEncoder(w)
err := encoder.Encode(m)
if err != nil {
panic(err)
}
}
func BuildLMModule(in <-chan *PageContainer) <-chan *PageContainer {
out := make(chan *PageContainer)
ngramFile, err := os.Create(ngramFilePath)
if err != nil {
panic(err)
}
newLine := []byte("\n")
go func() {
var c *PageContainer
var ok bool
for {
c, ok = <-in
if !ok {
close(out)
return
} else {
if !c.IsRedirect {
for k, v := range c.Unigrams {
for i := 0; i < v; i++ {
ngramFile.Write([]byte(k))
ngramFile.Write(newLine)
}
}
for k, v := range c.Bigrams {
for i := 0; i < v; i++ {
ngramFile.Write([]byte(k))
ngramFile.Write(newLine)
}
}
for k, v := range c.Trigrams {
for i := 0; i < v; i++ {
ngramFile.Write([]byte(k))
ngramFile.Write(newLine)
}
}
}
out <- c
}
}
}()
return out
}
func openCompressedPages(file io.Reader) <-chan *PageContainer {
decompressedStream, err := gzip.NewReader(file)
if err != nil {
panic(err)
}
return distributorFromGob(decompressedStream)
}
func saveSplitPages(input <-chan *PageContainer) {
featuredFile, err := os.Create(featuredFilePath)
if err != nil {
panic(err)
}
featuredCompressed := gzip.NewWriter(featuredFile)
defer featuredFile.Close()
normalFile, err := os.Create(normalFilePath)
if err != nil {
panic(err)
}
normalCompressed := gzip.NewWriter(normalFile)
defer normalFile.Close()
featuredChannel, featuredWriter := ArticleWriter(featuredCompressed)
normalChannel, normalWriter := ArticleWriter(normalCompressed)
//featuredChannel, featuredWriter := ArticleWriter(featuredFile)
//normalChannel, normalWriter := ArticleWriter(normalFile)
DistrbuteArticles(input, featuredChannel, normalChannel)
// Wait for all writers to finish
<-featuredWriter
<-normalWriter
// Close all the gzip streams
// I tried defering the close
// call but kept getting some EOF errors
featuredCompressed.Close()
normalCompressed.Close()
}
func saveLanguageModel(input <-chan map[string]int, lmFile io.Writer) {
mapWriter := WriteMap(input, lmFile)
<-mapWriter
}
func WriteMap(mapChannel <-chan map[string]int, w io.Writer) <-chan bool {
c := make(chan bool)
encoder := gob.NewEncoder(w)
go func() {
m := <-mapChannel
err := encoder.Encode(m)
if err != nil {
panic(err)
}
c <- true
}()
return c
}
func ReadMap(r io.Reader) (map[string]int, error) {
var m map[string]int
decoder := gob.NewDecoder(r)
err := decoder.Decode(&m)
if err != nil {
return nil, err
}
return m, nil
}
func DistrbuteArticles(input <-chan *PageContainer, featuredChannel, normalChannel chan<- *PageContainer) <-chan bool {
c := make(chan bool)
go func() {
var container *PageContainer
var ok bool
for {
container, ok = <-input
if !ok {
// channel was closed!
close(featuredChannel)
close(normalChannel)
c <- true
return
} else {
if container.IsFeatured {
featuredChannel <- container
} else if !container.IsRedirect {
normalChannel <- container
}
}
}
}()
return c
}
func ArticleWriter(w io.Writer) (chan<- *PageContainer, <-chan bool) {
c := make(chan *PageContainer)
finishChannel := make(chan bool)
encoder := gob.NewEncoder(w)
go func() {
var container *PageContainer
var ok bool
var err error
for {
container, ok = <-c
if !ok {
// channel was closed!
finishChannel <- true
return
} else {
err = encoder.Encode(container)
if err != nil {
panic(err)
}
}
}
}()
return c, finishChannel
}
func BuildRedirectMap() (chan<- *PageContainer, <-chan map[string]int) {
mapChannel := make(chan map[string]int)
input := make(chan *PageContainer)
m := make(map[string]int, 1000)
go func() {
var page *PageContainer
var ok bool
for {
page, ok = <-input
if !ok {
// channel was closed!
mapChannel <- m
return
} else {
m[page.Page.Redirect.Title] += 1
}
}
}()
return input, mapChannel
}