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render.go
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render.go
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package fir
import (
"fmt"
"html/template"
"github.com/livefir/fir/internal/dom"
"github.com/livefir/fir/internal/eventstate"
"github.com/livefir/fir/pubsub"
"github.com/patrickmn/go-cache"
"github.com/sourcegraph/conc/pool"
"github.com/tdewolff/minify/v2"
"github.com/tdewolff/minify/v2/html"
"github.com/valyala/bytebufferpool"
"k8s.io/klog/v2"
)
// renderDOMEvents renders the DOM events for the given pubsub event.
// the associated templates for the event are rendered and the dom events are returned.
func renderDOMEvents(ctx RouteContext, pubsubEvent pubsub.Event) []dom.Event {
eventIDWithState := fmt.Sprintf("%s:%s", *pubsubEvent.ID, pubsubEvent.State)
var templateNames []string
for k := range ctx.route.eventTemplates[eventIDWithState] {
templateNames = append(templateNames, k)
}
resultPool := pool.NewWithResults[dom.Event]()
for _, templateName := range templateNames {
templateName := templateName
resultPool.Go(func() dom.Event {
ev := buildDOMEventFromTemplate(ctx, pubsubEvent, eventIDWithState, templateName)
if ev == nil {
return dom.Event{}
}
return *ev
})
}
events := resultPool.Wait()
return trackErrors(ctx, pubsubEvent, events)
}
func targetOrClassName(target *string, className string) *string {
if target != nil && *target != "" {
return target
}
cls := fmt.Sprintf(".%s", className)
return &cls
}
func buildDOMEventFromTemplate(ctx RouteContext, pubsubEvent pubsub.Event, eventIDWithState, templateName string) *dom.Event {
if templateName == "-" {
eventType := fir(eventIDWithState)
return &dom.Event{
ID: *pubsubEvent.ID,
State: pubsubEvent.State,
Type: eventType,
Key: pubsubEvent.ElementKey,
Target: targetOrClassName(pubsubEvent.Target, getClassName(*eventType)),
Detail: pubsubEvent.StateDetail,
}
}
eventType := fir(eventIDWithState, templateName)
templateData := pubsubEvent.Detail
if pubsubEvent.State == eventstate.Error && pubsubEvent.Detail != nil {
errs, ok := pubsubEvent.Detail.(map[string]any)
if !ok {
klog.Errorf("Bindings.Events error: %s", "pubsubEvent.Detail is not a map[string]any")
return nil
}
templateData = map[string]any{"fir": newRouteDOMContext(ctx, errs)}
}
value, err := buildTemplateValue(ctx.route.template, templateName, templateData)
if err != nil {
klog.Errorf("Bindings.Events buildTemplateValue error for eventType: %v, err: %v", *eventType, err)
return nil
}
if pubsubEvent.State == eventstate.Error && value == "" {
return nil
}
return &dom.Event{
ID: eventIDWithState,
State: pubsubEvent.State,
Type: eventType,
Key: pubsubEvent.ElementKey,
Target: targetOrClassName(pubsubEvent.Target, getClassName(*eventType)),
Detail: value,
}
}
func trackErrors(ctx RouteContext, pubsubEvent pubsub.Event, events []dom.Event) []dom.Event {
var prevErrors map[string]string
if pubsubEvent.SessionID != nil {
v, ok := ctx.route.cache.Get(*pubsubEvent.SessionID)
if ok {
prevErrors, ok = v.(map[string]string)
if !ok {
panic("fir: cache value is not a map[string]string")
}
} else {
prevErrors = make(map[string]string)
}
} else {
prevErrors = make(map[string]string)
}
newErrors := make(map[string]string)
var newEvents []dom.Event
// set new errors & add events to newEvents
for _, event := range events {
if event.Type == nil {
continue
}
if event.State == eventstate.OK {
newEvents = append(newEvents, event)
continue
}
newErrors[*event.Type] = *event.Target
newEvents = append(newEvents, event)
}
// set new errors
if pubsubEvent.SessionID != nil {
ctx.route.cache.Set(*pubsubEvent.SessionID, newErrors, cache.DefaultExpiration)
}
// unset previously set errors
for k, v := range prevErrors {
k := k
v := v
eventType := &k
target := v
if _, ok := newErrors[*eventType]; ok {
continue
}
newEvents = append(newEvents, dom.Event{
Type: eventType,
Target: &target,
Detail: "",
})
}
if len(newEvents) == 0 {
eventIDWithState := fmt.Sprintf("%s:%s", *pubsubEvent.ID, pubsubEvent.State)
eventType := fir(eventIDWithState)
newEvents = append(newEvents, dom.Event{
ID: *pubsubEvent.ID,
State: pubsubEvent.State,
Type: eventType,
Key: pubsubEvent.ElementKey,
Target: targetOrClassName(pubsubEvent.Target, getClassName(*eventType)),
Detail: pubsubEvent.Detail,
})
}
return newEvents
}
func buildTemplateValue(t *template.Template, templateName string, data any) (string, error) {
if t == nil {
return "", nil
}
if templateName == "" {
return "", nil
}
dataBuf := bytebufferpool.Get()
defer bytebufferpool.Put(dataBuf)
if templateName == "_fir_html" {
dataBuf.WriteString(data.(string))
} else {
t.Option("missingkey=zero")
err := t.ExecuteTemplate(dataBuf, templateName, data)
if err != nil {
return "", err
}
}
m := minify.New()
m.Add("text/html", &html.Minifier{
KeepDefaultAttrVals: true,
})
rd, err := m.Bytes("text/html", addAttributes(dataBuf.Bytes()))
if err != nil {
panic(err)
}
return string(rd), nil
}