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healthcheck.go
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healthcheck.go
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package api
import (
"net/http"
"github.com/insolar/assured-ledger/ledger-core/appctl/beat"
"github.com/insolar/assured-ledger/ledger-core/instrumentation/inslogger"
"github.com/insolar/assured-ledger/ledger-core/network/nodeinfo"
)
// HealthChecker allows to check network status of a node.
type HealthChecker struct {
CertificateManager nodeinfo.CertificateManager
NodeNetwork beat.NodeNetwork
}
// NewHealthChecker creates new HealthChecker.
func NewHealthChecker(cm nodeinfo.CertificateManager, nn beat.NodeNetwork) *HealthChecker { // nolint: staticcheck
return &HealthChecker{CertificateManager: cm, NodeNetwork: nn}
}
// CheckHandler is a HTTP handler for health check.
func (hc *HealthChecker) CheckHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
ctx := r.Context()
na := hc.NodeNetwork.FindAnyLatestNodeSnapshot()
if na == nil {
inslogger.FromContext(ctx).Error("[ NodeService.GetStatus ] failed to get latest pulse")
_, _ = w.Write([]byte("FAIL"))
return
}
for _, node := range hc.CertificateManager.GetCertificate().GetDiscoveryNodes() {
if nd := na.FindNodeByRef(node.GetNodeRef()); nd == nil || !nd.IsStateful() {
w.WriteHeader(http.StatusInternalServerError)
_, _ = w.Write([]byte("FAIL"))
return
}
}
w.WriteHeader(http.StatusOK)
_, _ = w.Write([]byte("OK"))
}