148 lines
3.5 KiB
Go
148 lines
3.5 KiB
Go
package kubeprobes
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"strings"
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)
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// Kubeprobes represents liveness & readiness probes handler.
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type Kubeprobes interface {
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http.Handler
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// LivenessHandler returns [http.Handler] for liveness probes.
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LivenessHandler() http.Handler
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// ReadinessHandler returns [http.Handler] for readiness probes.
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ReadinessHandler() http.Handler
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}
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type kubeprobes struct {
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livenessProbes []Probe
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readinessProbes []Probe
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verbose bool
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pathLive string
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pathReady string
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}
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// New returns a new instance of a Kubernetes probes with given options.
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func New(options ...Option) (Kubeprobes, error) {
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kp := &kubeprobes{
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livenessProbes: []Probe{},
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readinessProbes: []Probe{},
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pathLive: defaultLivenessPath,
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pathReady: defaultReadinessPath,
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}
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for _, option := range options {
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option.apply(kp)
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}
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if err := kp.validate(); err != nil {
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return nil, err
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}
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return kp, nil
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}
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func (kp *kubeprobes) validate() error {
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var err error
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if kp.pathLive == "" {
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err = errors.Join(err, fmt.Errorf("liveness probe path must not be empty"))
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}
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if kp.pathReady == "" {
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err = errors.Join(err, fmt.Errorf("readiness probe path must not be empty"))
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}
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if !strings.HasPrefix(kp.pathLive, "/") {
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err = errors.Join(err, fmt.Errorf("liveness probe path must start with slash (current: %q)", kp.pathLive))
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}
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if !strings.HasPrefix(kp.pathReady, "/") {
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err = errors.Join(err, fmt.Errorf("readiness probe path must start with slash (current: %q)", kp.pathReady))
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}
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if kp.pathLive == kp.pathReady {
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err = errors.Join(err, fmt.Errorf("liveness and readiness probes have the same values (both %q)", kp.pathLive))
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}
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if len(kp.livenessProbes) == 0 {
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err = errors.Join(err, fmt.Errorf("no liveness probes defined"))
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}
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if len(kp.readinessProbes) == 0 {
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err = errors.Join(err, fmt.Errorf("no readiness probes defined"))
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}
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return err
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}
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type probesResponse struct {
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Passed []statusEntry `json:"passed,omitempty"`
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Failed []statusEntry `json:"failed,omitempty"`
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}
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func (kp *kubeprobes) handleLiveness(w http.ResponseWriter, r *http.Request) {
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sq := newStatusQuery(kp.livenessProbes)
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output := probesResponse{}
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sq.wait()
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output.Failed = sq.failed
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if r.URL.Query().Has(verboseOutputFlag) || kp.verbose {
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output.Passed = sq.passed
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}
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w.Header().Add(headerContentType, contentTypeJSON)
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if sq.ok {
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w.WriteHeader(http.StatusOK)
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} else {
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w.WriteHeader(http.StatusServiceUnavailable)
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}
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_ = json.NewEncoder(w).Encode(output)
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}
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func (kp *kubeprobes) handleReadiness(w http.ResponseWriter, r *http.Request) {
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sq := newStatusQuery(append(kp.livenessProbes, kp.readinessProbes...))
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output := probesResponse{}
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sq.wait()
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output.Failed = sq.failed
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if r.URL.Query().Has(verboseOutputFlag) || kp.verbose {
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output.Passed = sq.passed
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}
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w.Header().Add(headerContentType, contentTypeJSON)
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if sq.ok {
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w.WriteHeader(http.StatusOK)
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} else {
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w.WriteHeader(http.StatusServiceUnavailable)
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}
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_ = json.NewEncoder(w).Encode(output)
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}
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// LivenessHandler implements Kubeprobes.
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func (kp *kubeprobes) LivenessHandler() http.Handler {
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return http.HandlerFunc(kp.handleLiveness)
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}
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// ReadinessHandler implements Kubeprobes.
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func (kp *kubeprobes) ReadinessHandler() http.Handler {
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return http.HandlerFunc(kp.handleReadiness)
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}
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// ServeHTTP implements Kubeprobes.
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func (kp *kubeprobes) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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switch r.URL.Path {
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case kp.pathLive:
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kp.handleLiveness(w, r)
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case kp.pathReady:
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kp.handleReadiness(w, r)
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default:
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w.WriteHeader(http.StatusNotFound)
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}
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}
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