initial commit — makes requests and writes result to stdout

main.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"time"
+)
+
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+const (
+	hostDefault = "127.0.0.1:8085"
+	hostDesc    = "open hardware monitor host [OSHW_HOST]"
+)
+
+func run() error {
+	conifg := getConfig()
+	node, err := fetchNode(conifg.host)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("%s", node)
+	return nil
+}
+
+type config struct {
+	host string
+}
+
+func getConfig() *config {
+	c := config{}
+	host := os.Getenv("OHWM_HOST")
+	hostFlag := flag.String("host", hostDefault, hostDesc)
+	flag.Parse()
+	if *hostFlag != hostDefault {
+		host = *hostFlag
+	}
+	if host == "" {
+		host = hostDefault
+	}
+	c.host = host
+	return &c
+}
+
+func fetchNode(host string) (*node, error) {
+	client := http.Client{Timeout: time.Second}
+	u := url.URL{Scheme: "http", Host: host, Path: "/data.json"}
+	resp, err := client.Get(u.String())
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	node := &node{}
+	decoder := json.NewDecoder(resp.Body)
+	if err := decoder.Decode(node); err != nil {
+		return nil, err
+	}
+	return node, nil
+}
+
+type node struct {
+	ID       int `json:"id"`
+	ImageURL string
+	Max      string
+	Min      string
+	Text     string
+	Value    string
+	Children []node
+}
+
+func (n *node) String() string {
+	return n.stringify(0)
+}
+
+func (n *node) stringify(indent int) string {
+	prefix := ""
+	for i := 0; i < indent; i++ {
+		prefix += "  "
+	}
+
+	ret := prefix + n.Text
+	if n.Value != "" {
+		ret += ": " + n.Value
+	}
+	if n.Max != "" && n.Min != "" && n.Max != "-" && n.Min != "-" {
+		ret += fmt.Sprintf(" (%s - %s)", n.Min, n.Max)
+	}
+	ret += "\n"
+	for _, child := range n.Children {
+		ret += child.stringify(indent + 1)
+	}
+
+	return ret
+}