forked from jtopjian/terminus
/
facts.go
135 lines (120 loc) · 2.47 KB
/
facts.go
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package facts
import (
"encoding/json"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"sync"
"github.com/enr/terminus/lib/config"
)
// Facts main struct
type Facts struct {
Facts map[string]interface{}
mu sync.Mutex
}
// New creates facts
func New() *Facts {
m := make(map[string]interface{})
return &Facts{Facts: m}
}
func (f *Facts) add(key string, value interface{}) {
f.mu.Lock()
defer f.mu.Unlock()
f.Facts[key] = value
}
func processExternalFacts(c config.Config, f *Facts) {
d, err := os.Open(c.ExternalFactsDir)
if err != nil {
log.Println(err)
return
}
defer d.Close()
files, err := d.Readdir(0)
if err != nil {
log.Println(err)
return
}
executableFacts := make([]string, 0)
staticFacts := make([]string, 0)
for _, fi := range files {
fact := strings.TrimSuffix(fi.Name(), ".json")
if c.Path == "" || (c.Path != "" && strings.Contains(c.Path, fact)) {
name := filepath.Join(c.ExternalFactsDir, fi.Name())
if isExecutable(fi) {
executableFacts = append(executableFacts, name)
continue
}
if strings.HasSuffix(name, ".json") {
staticFacts = append(staticFacts, name)
}
}
}
var wg sync.WaitGroup
for _, p := range staticFacts {
p := p
wg.Add(1)
go factsFromFile(p, f, &wg)
}
for _, p := range executableFacts {
p := p
wg.Add(1)
go factsFromExec(p, f, &wg)
}
wg.Wait()
}
func charsToString(ca [65]byte) string {
s := make([]byte, len(ca))
var lens int
for ; lens < len(ca); lens++ {
if ca[lens] == 0 {
break
}
s[lens] = uint8(ca[lens])
}
return string(s[0:lens])
}
func readFileAndReturnValue(fileName string) (string, error) {
file, err := os.Open(fileName)
if err != nil {
return "", err
}
defer file.Close()
data, err := ioutil.ReadAll(file)
if err != nil {
return "", err
}
return strings.TrimSpace(string(data)), nil
}
func factsFromFile(path string, f *Facts, wg *sync.WaitGroup) {
defer wg.Done()
data, err := ioutil.ReadFile(path)
if err != nil {
log.Println(err)
return
}
var result interface{}
err = json.Unmarshal(data, &result)
if err != nil {
log.Println(err)
return
}
f.add(strings.TrimSuffix(filepath.Base(path), ".json"), result)
}
func factsFromExec(path string, f *Facts, wg *sync.WaitGroup) {
defer wg.Done()
out, err := exec.Command(path).Output()
if err != nil {
log.Println(err)
return
}
var result interface{}
err = json.Unmarshal(out, &result)
if err != nil {
log.Println(err)
return
}
f.add(filepath.Base(path), result)
}