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feat: introduce cluster events

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0x1d
2025-05-17 20:07:51 +02:00
parent de8af61ba7
commit e30f167766
13 changed files with 190 additions and 62 deletions
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20
README.md
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@@ -132,6 +132,7 @@ All endpoints except `/health` require authentication via an API token passed in
| GET | `/cluster/members` | Get the cluster members |
| POST | `/cluster/join` | Join cluster nodes |
| POST | `/cluster/leave` | Leave the cluster |
| POST | `/cluster/event` | Send a cluster event |
### Response Codes
@@ -144,6 +145,25 @@ All endpoints except `/health` require authentication via an API token passed in
### Request/Response Format
All endpoints use JSON for request and response payloads.
## Cluster Events
Cluster events are used for broadcast messages to all nodes in the cluster. They are sent as HTTP POST requests to the `/cluster/event` endpoint.
The request body should be a JSON object with the following fields:
- `name`: The name of the event
- `payload`: The payload of the event, optional
The response will be a JSON object with the following fields:
- `status`: The status of the event. This is a string, either "success" or "error".
- `error`: If the status is "error", this field will contain a string describing the error. This field is optional.
Following events are implemented:
| Event Name | Description | Payload |
|------------|----------------------|---------|
| restart | Restart the cluster | N/A |
| shutdown | Shutdown the cluster | N/A |
## Examples
### Connect to a WiFi Access Point

43
api/rcond.yaml
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@@ -668,3 +668,46 @@ paths:
application/json:
schema:
$ref: '#/components/schemas/Error'
/cluster/event:
post:
summary: Send a cluster event
description: Send a cluster event to all nodes in the cluster
requestBody:
description: Cluster event details
content:
application/json:
schema:
type: object
properties:
name:
description: Event name
type: string
example: "printHostname"
payload:
description: Event payload
type: string
example: "blabla"
responses:
'200':
description: Event sent successfully
content:
application/json:
schema:
type: object
properties:
status:
description: Indicates if the event was sent successfully
type: string
example: "success"
'400':
description: Bad request
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'500':
description: Internal server error
content:
application/json:
schema:
$ref: '#/components/schemas/Error'

8
cmd/rcond/main.go
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@@ -94,7 +94,7 @@ func startClusterAgent(appConfig *config.Config) *cluster.Agent {
clusterConfig := &appConfig.Cluster
if clusterConfig.Enabled {
log.Printf("Starting cluster agent on %s:%d", clusterConfig.BindAddr, clusterConfig.BindPort)
clusterAgent, err := cluster.NewAgent(clusterConfig)
clusterAgent, err := cluster.NewAgent(clusterConfig, cluster.ClusterEventsMap())
if err != nil {
log.Fatal(err)
}
@@ -102,12 +102,6 @@ func startClusterAgent(appConfig *config.Config) *cluster.Agent {
if len(clusterConfig.Join) > 0 {
clusterAgent.Join(clusterConfig.Join, true)
}
// get members in the cluster
members, err := clusterAgent.Members()
if err != nil {
log.Fatal(err)
}
log.Printf("Members: %v", members)
return clusterAgent
}
return nil

5
config/rcond-agent.yaml
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@@ -5,11 +5,12 @@ rcond:
cluster:
enabled: true
log_level: INFO
node_name: rcond-agent
secret_key: DMXnaJUUbIBMj1Df0dPsQY+Sks1VxWTa
advertise_addr: 0.0.0.0
advertise_port: 7947
bind_addr: 0.0.0.0
bind_port: 7947
# join:
# - 127.0.0.1:7946
join:
- 127.0.0.1:7946

2
config/rcond.yaml
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@@ -7,6 +7,8 @@ rcond:
cluster:
# Enable the cluster agent
enabled: true
# Log level
log_level: INFO
# Name of the node in the cluster
node_name: rcond
# Secret key for the cluster agent used for message encryption.

1
go.mod
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@@ -10,6 +10,7 @@ require (
github.com/godbus/dbus/v5 v5.1.0
github.com/google/uuid v1.6.0
github.com/gorilla/mux v1.8.1
github.com/hashicorp/logutils v1.0.0
github.com/hashicorp/serf v0.10.2
github.com/stretchr/testify v1.10.0
golang.org/x/crypto v0.37.0

2
go.sum
View File

@@ -70,6 +70,8 @@ github.com/hashicorp/go-uuid v1.0.1/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/b
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v1.0.2 h1:dV3g9Z/unq5DpblPpw+Oqcv4dU/1omnb4Ok8iPY6p1c=
github.com/hashicorp/golang-lru v1.0.2/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
github.com/hashicorp/logutils v1.0.0 h1:dLEQVugN8vlakKOUE3ihGLTZJRB4j+M2cdTm/ORI65Y=
github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64=
github.com/hashicorp/memberlist v0.5.2 h1:rJoNPWZ0juJBgqn48gjy59K5H4rNgvUoM1kUD7bXiuI=
github.com/hashicorp/memberlist v0.5.2/go.mod h1:Ri9p/tRShbjYnpNf4FFPXG7wxEGY4Nrcn6E7jrVa//4=
github.com/hashicorp/serf v0.10.2 h1:m5IORhuNSjaxeljg5DeQVDlQyVkhRIjJDimbkCa8aAc=

56
pkg/cluster/agent.go
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@@ -1,9 +1,12 @@
package cluster
import (
"encoding/json"
"log"
"os"
"github.com/0x1d/rcond/pkg/config"
"github.com/hashicorp/logutils"
"github.com/hashicorp/serf/serf"
)
@@ -11,8 +14,22 @@ type Agent struct {
Serf *serf.Serf
}
func NewAgent(clusterConfig *config.ClusterConfig) (*Agent, error) {
// ClusterEvent represents a custom event that will be sent to the Serf cluster
type ClusterEvent struct {
Name string
Data []byte
}
func NewAgent(clusterConfig *config.ClusterConfig, clusterEvents map[string]func([]byte)) (*Agent, error) {
config := serf.DefaultConfig()
config.Init()
logFilter := &logutils.LevelFilter{
Levels: []logutils.LogLevel{"DEBUG", "INFO", "WARN", "ERROR"},
MinLevel: logutils.LogLevel(clusterConfig.LogLevel),
Writer: os.Stderr,
}
config.LogOutput = logFilter
config.MemberlistConfig.LogOutput = logFilter
config.NodeName = clusterConfig.NodeName
config.ProtocolVersion = serf.ProtocolVersionMax
config.MemberlistConfig.SecretKey = []byte(clusterConfig.SecretKey)
@@ -21,6 +38,12 @@ func NewAgent(clusterConfig *config.ClusterConfig) (*Agent, error) {
config.MemberlistConfig.BindAddr = clusterConfig.BindAddr
config.MemberlistConfig.BindPort = clusterConfig.BindPort
// Setup event channel
eventCh := make(chan serf.Event, 10)
config.EventCh = eventCh
go handleEvents(eventCh, clusterEvents)
// Start Serf
serf, err := serf.Create(config)
if err != nil {
return nil, err
@@ -29,6 +52,19 @@ func NewAgent(clusterConfig *config.ClusterConfig) (*Agent, error) {
return &Agent{Serf: serf}, nil
}
// Event sends a custom event to the Serf cluster.
// It marshals the provided ClusterEvent into JSON and then uses Serf's UserEvent method to send the event.
func (a *Agent) Event(event ClusterEvent) error {
eventData, err := json.Marshal(event)
if err != nil {
return err
}
if err := a.Serf.UserEvent(event.Name, eventData, false); err != nil {
return err
}
return nil
}
func (a *Agent) Members() ([]serf.Member, error) {
log.Printf("Getting members of the cluster")
return a.Serf.Members(), nil
@@ -53,3 +89,21 @@ func (a *Agent) Shutdown() error {
log.Printf("Shutting down cluster agent")
return a.Serf.Shutdown()
}
// handleEvents handles Serf events received on the event channel
func handleEvents(eventCh chan serf.Event, clusterEvents map[string]func([]byte)) {
for event := range eventCh {
switch event.EventType() {
case serf.EventUser:
userEvent := event.(serf.UserEvent)
eventHandlers := clusterEvents
if handler, ok := eventHandlers[userEvent.Name]; ok {
handler(userEvent.Payload)
} else {
log.Printf("No event handler found for event: %s", userEvent.Name)
}
default:
log.Printf("Received event: %s\n", event.EventType())
}
}
}

34
pkg/cluster/events.go Normal file
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@@ -0,0 +1,34 @@
package cluster
import (
"log"
"github.com/0x1d/rcond/pkg/network"
"github.com/0x1d/rcond/pkg/system"
)
func ClusterEventsMap() map[string]func([]byte) {
return map[string]func([]byte){
"printHostname": printHostname,
"restart": restart,
"shutdown": shutdown,
}
}
func restart(payload []byte) {
if err := system.Restart(); err != nil {
log.Printf("(ClusterEvent:restart) failed: %s", err)
}
}
func shutdown(payload []byte) {
if err := system.Shutdown(); err != nil {
log.Printf("(ClusterEvent:shutdown) failed: %s", err)
}
}
// just a sample function to test event functionality
func printHostname(payload []byte) {
hostname, _ := network.GetHostname()
log.Printf("(ClusterEvent:printHostname): %s", hostname)
}

1
pkg/config/config.go
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@@ -25,6 +25,7 @@ type ClusterConfig struct {
AdvertisePort int `yaml:"advertise_port"`
BindAddr string `yaml:"bind_addr"`
BindPort int `yaml:"bind_port"`
LogLevel string `yaml:"log_level"`
}
func LoadConfig(path string) (*Config, error) {

75
pkg/http/handlers.go
View File

@@ -41,6 +41,11 @@ type authorizedKeyRequest struct {
PubKey string `json:"pubkey"`
}
type clusterEventRequest struct {
Name string `json:"name"`
Payload string `json:"payload,omitempty"`
}
type errorResponse struct {
Error string `json:"error"`
}
@@ -52,11 +57,6 @@ func writeError(w http.ResponseWriter, message string, code int) {
}
func HandleConfigureSTA(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
var req configureSTARequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeError(w, err.Error(), http.StatusBadRequest)
@@ -76,11 +76,6 @@ func HandleConfigureSTA(w http.ResponseWriter, r *http.Request) {
}
func HandleConfigureAP(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
var req configureAPRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeError(w, err.Error(), http.StatusBadRequest)
@@ -111,11 +106,6 @@ func HandleConfigureAP(w http.ResponseWriter, r *http.Request) {
}
func HandleNetworkUp(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPut {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
var req networkUpRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeError(w, err.Error(), http.StatusBadRequest)
@@ -137,11 +127,6 @@ func HandleNetworkUp(w http.ResponseWriter, r *http.Request) {
}
func HandleNetworkDown(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodDelete {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
vars := mux.Vars(r)
iface := vars["interface"]
if err := network.Down(iface); err != nil {
@@ -154,11 +139,6 @@ func HandleNetworkDown(w http.ResponseWriter, r *http.Request) {
}
func HandleNetworkRemove(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodDelete {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
vars := mux.Vars(r)
uuid := vars["uuid"]
if err := network.Remove(uuid); err != nil {
@@ -182,11 +162,6 @@ func HandleGetHostname(w http.ResponseWriter, r *http.Request) {
}
func HandleSetHostname(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
var req setHostnameRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeError(w, err.Error(), http.StatusBadRequest)
@@ -203,11 +178,6 @@ func HandleSetHostname(w http.ResponseWriter, r *http.Request) {
}
func HandleAddAuthorizedKey(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
var req authorizedKeyRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeError(w, err.Error(), http.StatusBadRequest)
@@ -227,11 +197,6 @@ func HandleAddAuthorizedKey(w http.ResponseWriter, r *http.Request) {
}
func HandleRemoveAuthorizedKey(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodDelete {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
vars := mux.Vars(r)
fingerprint := vars["fingerprint"]
if fingerprint == "" {
@@ -261,11 +226,6 @@ func HandleRemoveAuthorizedKey(w http.ResponseWriter, r *http.Request) {
}
func HandleReboot(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
if err := system.Restart(); err != nil {
writeError(w, err.Error(), http.StatusInternalServerError)
return
@@ -276,11 +236,6 @@ func HandleReboot(w http.ResponseWriter, r *http.Request) {
}
func HandleShutdown(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
writeError(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
if err := system.Shutdown(); err != nil {
writeError(w, err.Error(), http.StatusInternalServerError)
return
@@ -347,3 +302,23 @@ func HandleClusterMembers(w http.ResponseWriter, r *http.Request, agent *cluster
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(members)
}
func HandleClusterEvent(w http.ResponseWriter, r *http.Request, agent *cluster.Agent) {
var req clusterEventRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
writeError(w, err.Error(), http.StatusBadRequest)
return
}
event := cluster.ClusterEvent{
Name: req.Name,
Data: []byte(req.Payload),
}
err := agent.Event(event)
if err != nil {
writeError(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(map[string]string{"status": "success"})
}

1
pkg/http/server.go
View File

@@ -79,6 +79,7 @@ func (s *Server) RegisterRoutes() {
s.router.HandleFunc("/cluster/members", s.verifyToken(ClusterAgentHandler(s.clusterAgent, HandleClusterMembers))).Methods(http.MethodGet)
s.router.HandleFunc("/cluster/join", s.verifyToken(ClusterAgentHandler(s.clusterAgent, HandleClusterJoin))).Methods(http.MethodPost)
s.router.HandleFunc("/cluster/leave", s.verifyToken(ClusterAgentHandler(s.clusterAgent, HandleClusterLeave))).Methods(http.MethodPost)
s.router.HandleFunc("/cluster/event", s.verifyToken(ClusterAgentHandler(s.clusterAgent, HandleClusterEvent))).Methods(http.MethodPost)
}
func (s *Server) healthHandler(w http.ResponseWriter, r *http.Request) {

4
pkg/system/state.go
View File

@@ -13,7 +13,7 @@ func Restart() error {
log.Println("Rebooting system...")
call := obj.Call("org.freedesktop.systemd1.Manager.Reboot", 0)
if call.Err != nil {
log.Fatal(call.Err)
return call.Err
}
return nil
})
@@ -26,7 +26,7 @@ func Shutdown() error {
log.Println("Shutting down system...")
call := obj.Call("org.freedesktop.systemd1.Manager.PowerOff", 0)
if call.Err != nil {
log.Fatal(call.Err)
return call.Err
}
return nil
})