/
config.go
129 lines (101 loc) · 2.62 KB
/
config.go
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package marvin
import (
"fmt"
"log/slog"
"os"
"strings"
"github.com/mitchellh/mapstructure"
)
type arbitraryConfig = map[string]any
type Config struct {
Name string
LogLevel slog.Level `toml:"log_level"`
Bus map[string]arbitraryConfig
Reactor map[string]arbitraryConfig
err assemblyError
}
type Registry interface {
BusFor(string) BusAssembler
ReactorFor(string) ReactorAssembler
}
type assemblyError struct {
errs []error
}
func (cfg *Config) Assemble(registry Registry) (*Hub, error) {
logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
Level: cfg.LogLevel,
}))
slog.SetDefault(logger)
hub := New()
cfg.assembleBuses(hub, registry)
cfg.assembleReactors(hub, registry)
return hub, cfg.err.OrNil()
}
func (cfg *Config) assembleBuses(hub *Hub, registry Registry) {
for name, busConfig := range cfg.Bus {
assembler, err := extractAssembler("bus", name, busConfig, registry.BusFor)
if err != nil {
cfg.err.add(err)
continue
}
identifier := BusName(name)
bus, err := assembler(identifier, busConfig)
if err != nil {
cfg.err.add(fmt.Errorf("error assembling bus '%s': %w", name, err))
continue
}
hub.buses[identifier] = bus
}
}
func (cfg *Config) assembleReactors(hub *Hub, registry Registry) {
for name, reactorConfig := range cfg.Reactor {
assembler, err := extractAssembler("reactor", name, reactorConfig, registry.ReactorFor)
if err != nil {
cfg.err.add(err)
continue
}
identifier := ReactorName(name)
reactor, err := assembler(identifier, reactorConfig)
if err != nil {
cfg.err.add(fmt.Errorf("error assembling reactor '%s': %w", name, err))
continue
}
hub.reactors[identifier] = reactor
}
}
type componentAssembler interface {
BusAssembler | ReactorAssembler
}
func extractAssembler[T componentAssembler](
ct string,
name string,
rawConf arbitraryConfig,
fetcher func(string) T,
) (T, error) {
var conf struct{ Type string }
if err := mapstructure.Decode(rawConf, &conf); err != nil {
return nil, fmt.Errorf("could not extract type for %s '%s': %w", ct, name, err)
}
delete(rawConf, "type")
assembler := fetcher(conf.Type)
if assembler == nil {
return nil, fmt.Errorf("unknown type found for %s '%s'", ct, name)
}
return assembler, nil
}
func (ae *assemblyError) add(err error) {
ae.errs = append(ae.errs, err)
}
func (ae assemblyError) OrNil() error {
if len(ae.errs) == 0 {
return nil
}
return ae
}
func (ae assemblyError) Error() string {
all := make([]string, len(ae.errs))
for i := 0; i < len(all); i++ {
all[i] = " " + ae.errs[i].Error()
}
return "assembly errors:\n" + strings.Join(all, "\n")
}