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badge.go
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badge.go
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package badge
import (
"context"
"fmt"
"net/http"
"regexp"
healthutil "github.com/argoproj/gitops-engine/pkg/health"
"k8s.io/apimachinery/pkg/api/errors"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
appv1 "github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1"
"github.com/argoproj/argo-cd/v2/pkg/client/clientset/versioned"
"github.com/argoproj/argo-cd/v2/util/argo"
"github.com/argoproj/argo-cd/v2/util/assets"
"github.com/argoproj/argo-cd/v2/util/settings"
)
//NewHandler creates handler serving to do api/badge endpoint
func NewHandler(appClientset versioned.Interface, settingsMrg *settings.SettingsManager, namespace string) http.Handler {
return &Handler{appClientset: appClientset, namespace: namespace, settingsMgr: settingsMrg}
}
//Handler used to get application in order to access health/sync
type Handler struct {
namespace string
appClientset versioned.Interface
settingsMgr *settings.SettingsManager
}
var (
svgWidthPattern = regexp.MustCompile(`^<svg width="([^"]*)"`)
displayNonePattern = regexp.MustCompile(`display="none"`)
leftRectColorPattern = regexp.MustCompile(`id="leftRect" fill="([^"]*)"`)
rightRectColorPattern = regexp.MustCompile(`id="rightRect" fill="([^"]*)"`)
revisionRectColorPattern = regexp.MustCompile(`id="revisionRect" fill="([^"]*)"`)
leftTextPattern = regexp.MustCompile(`id="leftText" [^>]*>([^<]*)`)
rightTextPattern = regexp.MustCompile(`id="rightText" [^>]*>([^<]*)`)
revisionTextPattern = regexp.MustCompile(`id="revisionText" [^>]*>([^<]*)`)
)
const (
svgWidthWithRevision = 192
)
func replaceFirstGroupSubMatch(re *regexp.Regexp, str string, repl string) string {
result := ""
lastIndex := 0
for _, v := range re.FindAllSubmatchIndex([]byte(str), -1) {
groups := []string{}
for i := 0; i < len(v); i += 2 {
groups = append(groups, str[v[i]:v[i+1]])
}
result += str[lastIndex:v[0]] + groups[0] + repl
lastIndex = v[1]
}
return result + str[lastIndex:]
}
//ServeHTTP returns badge with health and sync status for application
//(or an error badge if wrong query or application name is given)
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
health := healthutil.HealthStatusUnknown
status := appv1.SyncStatusCodeUnknown
revision := ""
revisionEnabled := false
enabled := false
notFound := false
if sets, err := h.settingsMgr.GetSettings(); err == nil {
enabled = sets.StatusBadgeEnabled
}
//Sample url: http://localhost:8080/api/badge?name=123
if name, ok := r.URL.Query()["name"]; ok && enabled {
if app, err := h.appClientset.ArgoprojV1alpha1().Applications(h.namespace).Get(context.Background(), name[0], v1.GetOptions{}); err == nil {
health = app.Status.Health.Status
status = app.Status.Sync.Status
if app.Status.OperationState != nil && app.Status.OperationState.SyncResult != nil {
revision = app.Status.OperationState.SyncResult.Revision
}
} else if errors.IsNotFound(err) {
notFound = true
}
}
//Sample url: http://localhost:8080/api/badge?project=default
if projects, ok := r.URL.Query()["project"]; ok && enabled {
if apps, err := h.appClientset.ArgoprojV1alpha1().Applications(h.namespace).List(context.Background(), v1.ListOptions{}); err == nil {
applicationSet := argo.FilterByProjects(apps.Items, projects)
for _, a := range applicationSet {
if a.Status.Sync.Status != appv1.SyncStatusCodeSynced {
status = appv1.SyncStatusCodeOutOfSync
}
if a.Status.Health.Status != healthutil.HealthStatusHealthy {
health = healthutil.HealthStatusDegraded
}
}
if health != healthutil.HealthStatusDegraded && len(applicationSet) > 0 {
health = healthutil.HealthStatusHealthy
}
if status != appv1.SyncStatusCodeOutOfSync && len(applicationSet) > 0 {
status = appv1.SyncStatusCodeSynced
}
}
}
//Sample url: http://localhost:8080/api/badge?name=123&revision=true
if _, ok := r.URL.Query()["revision"]; ok && enabled {
revisionEnabled = true
}
leftColorString := ""
if leftColor, ok := HealthStatusColors[health]; ok {
leftColorString = toRGBString(leftColor)
} else {
leftColorString = toRGBString(Grey)
}
rightColorString := ""
if rightColor, ok := SyncStatusColors[status]; ok {
rightColorString = toRGBString(rightColor)
} else {
rightColorString = toRGBString(Grey)
}
leftText := string(health)
rightText := string(status)
if notFound {
leftText = "Not Found"
rightText = ""
}
badge := assets.BadgeSVG
badge = leftRectColorPattern.ReplaceAllString(badge, fmt.Sprintf(`id="leftRect" fill="%s" $2`, leftColorString))
badge = rightRectColorPattern.ReplaceAllString(badge, fmt.Sprintf(`id="rightRect" fill="%s" $2`, rightColorString))
badge = replaceFirstGroupSubMatch(leftTextPattern, badge, leftText)
badge = replaceFirstGroupSubMatch(rightTextPattern, badge, rightText)
if !notFound && revisionEnabled && revision != "" {
// Increase width of SVG and enable display of revision components
badge = svgWidthPattern.ReplaceAllString(badge, fmt.Sprintf(`<svg width="%d" $2`, svgWidthWithRevision))
badge = displayNonePattern.ReplaceAllString(badge, `display="inline"`)
badge = revisionRectColorPattern.ReplaceAllString(badge, fmt.Sprintf(`id="revisionRect" fill="%s" $2`, rightColorString))
shortRevision := revision
if len(shortRevision) > 7 {
shortRevision = shortRevision[:7]
}
badge = replaceFirstGroupSubMatch(revisionTextPattern, badge, fmt.Sprintf("(%s)", shortRevision))
}
w.Header().Set("Content-Type", "image/svg+xml")
//Ask cache's to not cache the contents in order prevent the badge from becoming stale
w.Header().Set("Cache-Control", "private, no-store")
//Allow badges to be fetched via XHR from frontend applications without running into CORS issues
w.Header().Set("Access-Control-Allow-Origin", "*")
w.WriteHeader(http.StatusOK)
_, _ = w.Write([]byte(badge))
}