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devmodule.go
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devmodule.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package hotreload
import (
"context"
"fmt"
"io/fs"
"path/filepath"
"namespacelabs.dev/foundation/internal/build"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/fnfs/workspace/wsremote"
"namespacelabs.dev/foundation/internal/integrations"
"namespacelabs.dev/foundation/internal/wscontents"
"namespacelabs.dev/foundation/std/tasks"
)
type devModule struct {
module build.Workspace
observeChanges bool
digestMode bool
sink wsremote.Sink
extraInputs []compute.UntypedComputable
}
func NewDevModule(module build.Workspace, observeChanges, digestMode bool, opts integrations.HotReloadOpts, extraInputs ...compute.UntypedComputable) build.Workspace {
return devModule{
module: module,
observeChanges: observeChanges,
digestMode: digestMode,
sink: observerSink{opts.Sink, opts.EventProcessor},
extraInputs: extraInputs,
}
}
func (w devModule) ModuleName() string { return w.module.ModuleName() }
func (w devModule) Abs() string { return w.module.Abs() }
func (w devModule) IsExternal() bool { return w.module.IsExternal() }
func (w devModule) ReadOnlyFS(rel ...string) fs.FS { return w.module.ReadOnlyFS(rel...) }
func (w devModule) ChangeTrigger(rel string, excludes []string) compute.Computable[any] {
// If observing is disabled, we still need to trigger any subsequent
// dependencies, as these may be related w/ for example codegeneration that
// needs to happen before a build.
if !w.observeChanges {
in := compute.Inputs()
for k, extra := range w.extraInputs {
in = in.Computable(fmt.Sprintf("extra:%d", k), extra)
}
return compute.Map(tasks.Action("dev.trigger-actions"), in, compute.Output{NotCacheable: true}, func(ctx context.Context, r compute.Resolved) (any, error) {
return "no action", nil
})
}
return wsremote.ObserveAndPush(filepath.Join(w.module.Abs(), rel), excludes, w.sink, w.digestMode, w.extraInputs...)
}
type observerSink struct {
sink wsremote.Sink
eventProcessor func(*wscontents.FileEvent) *wscontents.FileEvent
}
func (obs observerSink) Deposit(ctx context.Context, events []*wscontents.FileEvent) (bool, error) {
fmt.Fprintf(console.Debug(ctx), "deposit\n")
processedEvents := []*wscontents.FileEvent{}
for _, ev := range events {
processedEvent := ev
if obs.eventProcessor != nil {
processedEvent = obs.eventProcessor(ev)
if processedEvent == nil {
return false, nil
}
}
processedEvents = append(processedEvents, processedEvent)
}
if obs.sink == nil {
return false, nil
}
return obs.sink.Deposit(ctx, processedEvents)
}