85 lines
2.4 KiB
Go
85 lines
2.4 KiB
Go
package signal
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/*
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#include <stddef.h>
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#include <stdbool.h>
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extern bool StatusServiceSignalEvent(const char *jsonEvent);
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*/
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import "C"
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import (
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"encoding/json"
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"sync"
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"github.com/ethereum/go-ethereum/log"
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)
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// All general log messages in this package should be routed through this logger.
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var logger = log.New("package", "status-go/signal")
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// Envelope is a general signal sent upward from node to RN app
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type Envelope struct {
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Type string `json:"type"`
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Event interface{} `json:"event"`
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}
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// NewEnvelope creates new envlope of given type and event payload.
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func NewEnvelope(typ string, event interface{}) *Envelope {
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return &Envelope{
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Type: typ,
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Event: event,
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}
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}
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// send sends application signal (in JSON) upwards to application (via default notification handler)
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func send(typ string, event interface{}) {
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signal := NewEnvelope(typ, event)
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data, err := json.Marshal(&signal)
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if err != nil {
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logger.Error("Marshalling signal envelope", "error", err)
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}
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C.StatusServiceSignalEvent(C.CString(string(data)))
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}
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// NodeNotificationHandler defines a handler able to process incoming node events.
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// Events are encoded as JSON strings.
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type NodeNotificationHandler func(jsonEvent string)
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var notificationHandler NodeNotificationHandler = TriggerDefaultNodeNotificationHandler
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// notificationHandlerMutex guards notificationHandler for concurrent calls
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var notificationHandlerMutex sync.RWMutex
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// SetDefaultNodeNotificationHandler sets notification handler to invoke on Send
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func SetDefaultNodeNotificationHandler(fn NodeNotificationHandler) {
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notificationHandlerMutex.Lock()
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notificationHandler = fn
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notificationHandlerMutex.Unlock()
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}
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// ResetDefaultNodeNotificationHandler sets notification handler to default one
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func ResetDefaultNodeNotificationHandler() {
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notificationHandlerMutex.Lock()
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notificationHandler = TriggerDefaultNodeNotificationHandler
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notificationHandlerMutex.Unlock()
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}
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// TriggerDefaultNodeNotificationHandler triggers default notification handler (helpful in tests)
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func TriggerDefaultNodeNotificationHandler(jsonEvent string) {
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logger.Trace("Notification received", "event", jsonEvent)
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}
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//export NotifyNode
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//nolint: golint
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func NotifyNode(jsonEvent *C.char) {
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notificationHandlerMutex.RLock()
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defer notificationHandlerMutex.RUnlock()
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notificationHandler(C.GoString(jsonEvent))
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}
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//export TriggerTestSignal
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//nolint: golint
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func TriggerTestSignal() {
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C.StatusServiceSignalEvent(C.CString(`{"answer": 42}`))
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}
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