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nfqparser.go
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nfqparser.go
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package nfqparser
import (
"bufio"
"bytes"
"io/ioutil"
"strings"
"sync"
)
// NFQParser holds nfqparser fields
type NFQParser struct {
nfqStr string
// NOTE: For unit test
filePath string
contents map[string]NFQLayout
sync.Mutex
}
// NewNFQParser returns nfqparser handler
func NewNFQParser() *NFQParser {
return &NFQParser{
contents: make(map[string]NFQLayout),
filePath: nfqFilePath,
}
}
// Synchronize reads from file and parses it
func (n *NFQParser) Synchronize() error {
n.Lock()
defer n.Unlock()
data, err := ioutil.ReadFile(n.filePath)
if err != nil {
return err
}
n.nfqStr = string(data)
scanner := bufio.NewScanner(bytes.NewReader(data))
for scanner.Scan() {
line := scanner.Text()
lineParts := strings.Fields(line)
newNFQ := makeNFQLayout(lineParts)
n.contents[newNFQ.QueueNum] = newNFQ
}
return nil
}
// RetrieveByQueue returns layout for a specific queue number
func (n *NFQParser) RetrieveByQueue(queueNum string) *NFQLayout {
n.Lock()
defer n.Unlock()
content, ok := n.contents[queueNum]
if ok {
return &content
}
return nil
}
// RetrieveAll returns all layouts
func (n *NFQParser) RetrieveAll() map[string]NFQLayout {
n.Lock()
defer n.Unlock()
return n.contents
}
// String returns string renresentation of nfqueue data
func (n *NFQParser) String() string {
n.Lock()
defer n.Unlock()
return n.nfqStr
}
func makeNFQLayout(data []string) NFQLayout {
newNFQ := NFQLayout{}
newNFQ.QueueNum = data[0]
newNFQ.PeerPortID = data[1]
newNFQ.QueueTotal = data[2]
newNFQ.CopyMode = data[3]
newNFQ.CopyRange = data[4]
newNFQ.QueueDropped = data[5]
newNFQ.UserDropped = data[6]
newNFQ.IDSequence = data[7]
return newNFQ
}