|
| 1 | +package cmd |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "encoding/json" |
| 6 | + "fmt" |
| 7 | + "log" |
| 8 | + "strings" |
| 9 | + "time" |
| 10 | + |
| 11 | + "go.uber.org/zap" |
| 12 | + |
| 13 | + corev1 "k8s.io/api/core/v1" |
| 14 | + apierrors "k8s.io/apimachinery/pkg/api/errors" |
| 15 | + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 16 | + "k8s.io/apimachinery/pkg/util/wait" |
| 17 | + kclient "k8s.io/client-go/kubernetes" |
| 18 | + |
| 19 | + "github.com/triggermesh/scoby-hook-triggermesh/pkg/config/observability" |
| 20 | + "github.com/triggermesh/scoby-hook-triggermesh/pkg/kubernetes" |
| 21 | +) |
| 22 | + |
| 23 | +type ConfigMethod int |
| 24 | + |
| 25 | +const ( |
| 26 | + ConfigMethodUnknown = iota |
| 27 | + ConfigMethodKubernetesConfigMap |
| 28 | + ConfigMethodCommandLineOrEnv |
| 29 | +) |
| 30 | + |
| 31 | +type Globals struct { |
| 32 | + Port int `help:"HTTP Port to listen for hook requests." env:"PORT" default:"8080"` |
| 33 | + |
| 34 | + Kubeconfig string `help:"Kubeconfig file." env:"KUBECONFIG"` |
| 35 | + |
| 36 | + ObservabilityConfig string `help:"JSON representation of observability configuration." env:"OBSERVABILITY_CONFIG"` |
| 37 | + |
| 38 | + // Kubernetes parameters |
| 39 | + KubernetesNamespace string `help:"Namespace where the hook is running." env:"KUBERNETES_NAMESPACE"` |
| 40 | + KubernetesObservabilityConfigMapName string `help:"ConfigMap object name that contains the observability configuration." env:"KUBERNETES_OBSERVABILITY_CONFIGMAP_NAME"` |
| 41 | + |
| 42 | + Context context.Context `kong:"-"` |
| 43 | + Logger *zap.SugaredLogger `kong:"-"` |
| 44 | + LogLevel zap.AtomicLevel `kong:"-"` |
| 45 | + KubeClient kclient.Interface `kong:"-"` |
| 46 | + ConfigMethod ConfigMethod `kong:"-"` |
| 47 | +} |
| 48 | + |
| 49 | +func (g *Globals) Validate() error { |
| 50 | + msg := []string{} |
| 51 | + |
| 52 | + switch { |
| 53 | + case g.KubernetesObservabilityConfigMapName != "": |
| 54 | + if g.KubernetesNamespace == "" { |
| 55 | + msg = append(msg, "Kubernetes namespace must be informed.") |
| 56 | + } |
| 57 | + |
| 58 | + if g.ObservabilityConfig != "" { |
| 59 | + msg = append(msg, "Argument or environment config cannot be used along with Kubernetes configuration.") |
| 60 | + } |
| 61 | + |
| 62 | + g.ConfigMethod = ConfigMethodKubernetesConfigMap |
| 63 | + |
| 64 | + case g.ObservabilityConfig != "": |
| 65 | + if g.KubernetesObservabilityConfigMapName != "" { |
| 66 | + msg = append(msg, "Argument or environment config cannot be used along with Kubernetes configuration.") |
| 67 | + } |
| 68 | + |
| 69 | + g.ConfigMethod = ConfigMethodCommandLineOrEnv |
| 70 | + } |
| 71 | + |
| 72 | + if len(msg) != 0 { |
| 73 | + g.ConfigMethod = ConfigMethodUnknown |
| 74 | + return fmt.Errorf(strings.Join(msg, " ")) |
| 75 | + } |
| 76 | + |
| 77 | + return nil |
| 78 | +} |
| 79 | + |
| 80 | +func (g *Globals) Initialize() error { |
| 81 | + var cfg *observability.Config |
| 82 | + var l *zap.Logger |
| 83 | + defaultConfigApplied := false |
| 84 | + var err error |
| 85 | + |
| 86 | + kcfg, err := kubernetes.NewClient(g.Kubeconfig) |
| 87 | + if err != nil { |
| 88 | + return err |
| 89 | + } |
| 90 | + g.KubeClient = kcfg |
| 91 | + |
| 92 | + switch { |
| 93 | + case g.ObservabilityConfig != "": |
| 94 | + data := map[string]string{} |
| 95 | + err = json.Unmarshal([]byte(g.ObservabilityConfig), &data) |
| 96 | + if err != nil { |
| 97 | + log.Printf("Could not appliying provided config: %v", err) |
| 98 | + defaultConfigApplied = true |
| 99 | + break |
| 100 | + } |
| 101 | + |
| 102 | + cfg, err = observability.ParseFromMap(data) |
| 103 | + if err != nil || cfg.LoggerCfg == nil { |
| 104 | + log.Printf("Could not appliying provided config: %v", err) |
| 105 | + defaultConfigApplied = true |
| 106 | + } |
| 107 | + |
| 108 | + case g.KubernetesObservabilityConfigMapName != "": |
| 109 | + cm := &corev1.ConfigMap{} |
| 110 | + var lastErr error |
| 111 | + if err := wait.PollImmediate(1*time.Second, 5*time.Second, func() (bool, error) { |
| 112 | + cm, lastErr = g.KubeClient.CoreV1().ConfigMaps(g.KubernetesNamespace).Get(g.Context, g.KubernetesObservabilityConfigMapName, metav1.GetOptions{}) |
| 113 | + return lastErr == nil || apierrors.IsNotFound(lastErr), nil |
| 114 | + }); err != nil { |
| 115 | + log.Printf("Could not retrieve observability ConfigMap %q: %v", |
| 116 | + g.KubernetesObservabilityConfigMapName, err) |
| 117 | + defaultConfigApplied = true |
| 118 | + } |
| 119 | + |
| 120 | + cfg, err = observability.ParseFromMap(cm.Data) |
| 121 | + if err != nil || cfg.LoggerCfg == nil { |
| 122 | + log.Printf("Could not apply provided config from ConfigMap %q: %v", |
| 123 | + g.KubernetesObservabilityConfigMapName, err) |
| 124 | + defaultConfigApplied = true |
| 125 | + } |
| 126 | + |
| 127 | + default: |
| 128 | + log.Print("Applying default configuration") |
| 129 | + defaultConfigApplied = true |
| 130 | + } |
| 131 | + |
| 132 | + if defaultConfigApplied { |
| 133 | + cfg = observability.DefaultConfig() |
| 134 | + } |
| 135 | + |
| 136 | + // Call build to perform validation of zap configuration. |
| 137 | + l, err = cfg.LoggerCfg.Build() |
| 138 | + for { |
| 139 | + if err == nil { |
| 140 | + break |
| 141 | + } |
| 142 | + if defaultConfigApplied { |
| 143 | + return fmt.Errorf("default config failed to be applied due to error: %w", err) |
| 144 | + } |
| 145 | + |
| 146 | + defaultConfigApplied = true |
| 147 | + cfg = observability.DefaultConfig() |
| 148 | + l, err = cfg.LoggerCfg.Build() |
| 149 | + } |
| 150 | + |
| 151 | + g.LogLevel = cfg.LoggerCfg.Level |
| 152 | + |
| 153 | + g.Logger = l.Sugar() |
| 154 | + g.LogLevel = cfg.LoggerCfg.Level |
| 155 | + |
| 156 | + return nil |
| 157 | +} |
| 158 | + |
| 159 | +func (g *Globals) Flush() { |
| 160 | + if g.Logger != nil { |
| 161 | + _ = g.Logger.Sync() |
| 162 | + } |
| 163 | +} |
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