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main.go
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main.go
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//+build js,wasm
package main
import (
"bytes"
"encoding/json"
"fmt"
"html/template"
"net/http"
"os"
"sort"
"syscall/js"
"time"
"github.com/Masterminds/semver"
"gopkg.in/src-d/go-git.v4/plumbing"
"github.com/crhntr/relslash"
)
func main() {
document := js.Global().Get("document")
body := document.Get("body")
statusIndicator := make(chan string)
go statusText(body, statusIndicator)
fatal := func(err error) {
statusIndicator <- "ERROR " + err.Error()
time.Sleep(time.Second)
os.Exit(1)
}
statusIndicator <- "Requesting data"
var data struct {
relslash.BoshReleaseBumpSetData
VersionMapping map[string][]relslash.Reference
}
res, err := http.Get("/api/v0/data")
if err != nil {
fatal(err)
}
if res.StatusCode != http.StatusOK {
fatal(fmt.Errorf("non successful status code: %d", res.StatusCode))
}
statusIndicator <- "Parsing data"
if err := json.NewDecoder(res.Body).Decode(&data); err != nil {
fatal(err)
}
sort.Sort(relslash.VersionsDecreasing(data.BoshReleaseVersions))
statusIndicator <- "Rendering Data"
t := template.New("page-template")
t = t.Funcs(template.FuncMap{
"ShortBranchName": func(ref *plumbing.Reference) string {
return ref.Name().Short()
},
"CurrentBOSHReleaseVersion": func(ref *plumbing.Reference) string {
for v, branches := range data.VersionMapping {
for _, b := range branches {
if (*plumbing.Reference)(&b).Strings() == ref.Strings() {
ver, err := semver.NewVersion(v)
if err != nil {
fmt.Println("could not render version for branch: %s", err)
}
return ver.String()
}
}
}
return ""
},
})
pageTemplate := template.Must(t.Parse(document.Call("getElementById", "page-template").Get("innerText").String()))
var buf bytes.Buffer
if err := pageTemplate.Execute(&buf, data); err != nil {
fatal(err)
}
close(statusIndicator)
body.Set("innerHTML", buf.String())
select {}
}
func statusText(el js.Value, status chan string) {
msg := el.Get("innerTEXT").String()
ticker := time.NewTicker(time.Second)
dots := "..."
loop:
for i := 0; ; i++ {
select {
case <-ticker.C:
el.Set("innerHTML", msg+dots[:i%(len(dots)+1)])
case str, open := <-status:
if !open {
ticker.Stop()
break loop
}
dots = "..."
msg = str
}
}
}