/
manager.go
177 lines (149 loc) · 4.19 KB
/
manager.go
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package manager
import (
"context"
"fmt"
"github.com/ischenkx/kantoku/pkg/common/data/record"
"github.com/ischenkx/kantoku/pkg/common/dependency"
"github.com/ischenkx/kantoku/pkg/core/system"
"github.com/mitchellh/mapstructure"
"github.com/samber/lo"
"golang.org/x/sync/errgroup"
"log/slog"
)
type Manager struct {
System system.AbstractSystem
Dependencies dependency.Manager
TaskToGroup TaskToGroup
Resolvers map[string]Resolver
Logger *slog.Logger
}
func (manager *Manager) Register(ctx context.Context, id string) error {
// TODO: use compensating transactions for consistency
t, err := manager.System.Task(ctx, id)
if err != nil {
return fmt.Errorf("failed to get task: %w", err)
}
rawSpecs, ok := t.Info["dependencies"]
if !ok {
rawSpecs = nil
}
var specs []DependencySpec
if err := mapstructure.Decode(rawSpecs, &specs); err != nil {
return fmt.Errorf("failed to decode dependencies: %w", err)
}
dependencies, err := manager.Dependencies.NewDependencies(ctx, len(specs))
if err != nil {
return fmt.Errorf("failed to allocate new dependencies: %w", err)
}
depIds := lo.Map(dependencies, func(dep dependency.Dependency, _ int) string {
return dep.ID
})
for index, depId := range depIds {
spec := specs[index]
resolver, ok := manager.Resolvers[spec.Name]
if !ok {
return fmt.Errorf("failed to find a resolver for '%s'", spec.Name)
}
if err := resolver.Bind(ctx, depId, spec.Data); err != nil {
return fmt.Errorf("failed to bind: %w", err)
}
}
groupId, err := manager.Dependencies.NewGroup(ctx)
if err != nil {
return fmt.Errorf("failed to create a dependency group: %w", err)
}
if err := manager.TaskToGroup.Save(ctx, id, groupId); err != nil {
return fmt.Errorf("failed to save a task-group binding: %w", err)
}
if err := manager.Dependencies.InitializeGroup(ctx, groupId, depIds...); err != nil {
return fmt.Errorf("failed to initialize group: %w", err)
}
err = manager.System.
Tasks().
Filter(record.R{"id": id}).
Update(ctx,
record.R{"dependencies": depIds, "group_id": groupId},
record.R{"id": id},
)
if err != nil {
return fmt.Errorf("failed to update task's info: %w", err)
}
return nil
}
func (manager *Manager) Ready(ctx context.Context) (tasks <-chan string, err error) {
g, ctx := errgroup.WithContext(ctx)
_tasks := make(chan string, 1024)
manager.resolveDependencies(ctx, g)
g.Go(func() error {
manager.Logger.Debug("collecting ready tasks")
return manager.collectReadyTasks(ctx, _tasks)
})
go func() {
if err := g.Wait(); err != nil {
manager.Logger.Info("",
slog.String("error", err.Error()))
}
}()
return _tasks, nil
}
func (manager *Manager) resolveDependencies(ctx context.Context, g *errgroup.Group) {
for label, resolver := range manager.Resolvers {
g.Go(func() error {
manager.Logger.Info("starting a resolver",
slog.String("label", label))
depsChannel, err := resolver.Ready(ctx)
if err != nil {
return err
}
depResolver:
for {
select {
case <-ctx.Done():
break depResolver
case dep := <-depsChannel:
manager.Logger.Debug("received a dependency from resolver",
slog.String("dependency_id", dep),
slog.String("resolver", label))
err := manager.Dependencies.Resolve(ctx, dependency.Dependency{
ID: dep,
Status: dependency.OK,
})
if err != nil {
manager.Logger.Error("failed to resolve a dependency",
slog.String("error", err.Error()))
}
}
}
return nil
})
}
}
func (manager *Manager) collectReadyTasks(ctx context.Context, tasks chan<- string) error {
channel, err := manager.Dependencies.ReadyGroups(ctx)
if err != nil {
return fmt.Errorf("failed to read ready groups: %w", err)
}
collector:
for {
select {
case id := <-channel:
task, err := manager.TaskToGroup.TaskByGroup(ctx, id)
if err != nil {
manager.Logger.Error("failed to get task by group",
slog.String("error", err.Error()))
continue
}
manager.Logger.Debug("received a ready group",
slog.String("group_id", id),
slog.String("task_id", task))
select {
case <-ctx.Done():
break collector
case tasks <- task:
}
case <-ctx.Done():
break collector
}
}
return nil
}