105 lines
2.3 KiB
Go
105 lines
2.3 KiB
Go
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// Copyright © 2023 Roberto Hidalgo <event-gateway@un.rob.mx>
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// SPDX-License-Identifier: Apache-2.0
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package config
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import (
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"strings"
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"git.rob.mx/nidito/event-gateway/internal/sink"
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"git.rob.mx/nidito/event-gateway/internal/sink/types"
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source "git.rob.mx/nidito/event-gateway/internal/source/types"
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)
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// RawSource is an intermediate source representation.
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type RawSource struct {
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Kind source.Kind `json:"kind"`
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Config json.RawMessage
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}
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func (s *RawSource) UnmarshalJSON(raw []byte) error {
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s.Config = raw
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inner := &struct {
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Kind source.Kind `json:"kind"`
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}{}
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if err := json.Unmarshal(raw, &inner); err != nil {
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return fmt.Errorf("unable to decode source: %s: %s", raw, err)
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}
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s.Kind = inner.Kind
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return nil
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}
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// Source is an interface concrete.
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type Source interface {
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Initialize()
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Kind() source.Kind
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Register(listener *Listener) error
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Deregister(ID string)
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}
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// Listener is the configuration for a source.
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type Listener struct {
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ID string
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Source *RawSource
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Event types.Event `json:"sink"`
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Hash string
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}
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func (l *Listener) UnmarshalJSON(raw []byte) error {
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cfg := &struct {
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Event json.RawMessage `json:"sink"`
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Source *RawSource `json:"source"`
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}{}
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if err := json.Unmarshal(raw, &cfg); err != nil {
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return fmt.Errorf("unable to decode %s: %s", raw, err)
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}
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l.Source = cfg.Source
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if cfg.Event == nil {
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return fmt.Errorf("sink configuration not provided: %s", raw)
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}
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sink, err := sink.Parse(cfg.Event)
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if err != nil {
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return fmt.Errorf("sink configuration for %s is invalid: %+v", raw, err)
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}
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l.Event = sink
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hasher := sha256.New()
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hasher.Write(raw)
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l.Hash = base64.URLEncoding.EncodeToString(hasher.Sum(nil))
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return nil
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}
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// Loader represents a configurator interface.
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type Loader interface {
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Load() ([]*Listener, error)
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String() string
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Watch(chan []*Listener)
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}
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// FromURN returns a Loader given a :// path.
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func FromURN(urn string) (Loader, error) {
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URLparts := strings.SplitN(urn, "://", 2)
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if len(URLparts) == 1 {
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URLparts = []string{"file", URLparts[0]}
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}
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scheme := URLparts[0]
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configAddr := URLparts[1]
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switch scheme {
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case "file":
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return &File{Path: configAddr}, nil
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case "consul":
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return NewConsul(configAddr)
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}
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return nil, fmt.Errorf("unknown config address: %s", urn)
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}
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