diff --git a/cmd/mcgod/main.go b/cmd/mcgod/main.go index ca6a104..8c47a5e 100644 --- a/cmd/mcgod/main.go +++ b/cmd/mcgod/main.go @@ -6,7 +6,6 @@ import ( "os" "os/signal" "syscall" - "time" "tipsy.codes/charles/mc-god/v2/internal/pkg/rcon" ) @@ -43,50 +42,4 @@ func main() { log.Fatalf("Health check failed: %v", err) } log.Println("Connected successfully!") - - // Example usage of various RCON functions - log.Println("Executing sample commands...") - - // Get server info - info, err := client.GetServerInfo() - if err != nil { - log.Printf("Failed to get server info: %v", err) - } else { - log.Printf("Server info: %s", info) - } - - // Set weather to clear - if err := client.SetWeather("clear"); err != nil { - log.Printf("Failed to set weather: %v", err) - } else { - log.Println("Weather set to clear") - } - - // Set time to day - if err := client.SetTime("day"); err != nil { - log.Printf("Failed to set time: %v", err) - } else { - log.Println("Time set to day") - } - - // Set difficulty to normal - if err := client.SetDifficulty("normal"); err != nil { - log.Printf("Failed to set difficulty: %v", err) - } else { - log.Println("Difficulty set to normal") - } - - // Example of executing a custom command - response, err := client.ExecuteWithTimeout("list", 5*time.Second) - if err != nil { - log.Printf("Failed to execute 'list' command: %v", err) - } else { - log.Printf("Players list response: %s", response) - } - - // Keep the application running until interrupted - log.Println("MC God is now running. Press Ctrl+C to stop.") - <-ctx.Done() - - log.Println("MC God stopped gracefully.") } diff --git a/go.mod b/go.mod index 99b934c..4787b05 100644 --- a/go.mod +++ b/go.mod @@ -5,4 +5,49 @@ go 1.25.6 require ( github.com/google/go-cmp v0.7.0 github.com/gorcon/rcon v1.4.0 + github.com/stretchr/testify v1.9.0 + k8s.io/api v0.31.0 + k8s.io/apimachinery v0.31.0 + k8s.io/client-go v0.31.0 +) + +require ( + github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/fxamacker/cbor/v2 v2.7.0 // indirect + github.com/go-logr/logr v1.4.2 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.22.4 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.4 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/x448/float16 v0.8.4 // indirect + golang.org/x/net v0.26.0 // indirect + golang.org/x/oauth2 v0.21.0 // indirect + golang.org/x/sys v0.21.0 // indirect + golang.org/x/term v0.21.0 // indirect + golang.org/x/text v0.16.0 // indirect + golang.org/x/time v0.3.0 // indirect + google.golang.org/protobuf v1.34.2 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/klog/v2 v2.130.1 // indirect + k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 // indirect + k8s.io/utils v0.0.0-20240711033017-18e509b52bc8 // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect + sigs.k8s.io/yaml v1.4.0 // indirect ) diff --git a/go.sum b/go.sum index 4baadc7..dec885e 100644 --- a/go.sum +++ b/go.sum @@ -1,4 +1,156 @@ +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM= +github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/emicklei/go-restful/v3 v3.11.0 h1:rAQeMHw1c7zTmncogyy8VvRZwtkmkZ4FxERmMY4rD+g= +github.com/emicklei/go-restful/v3 v3.11.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= +github.com/fxamacker/cbor/v2 v2.7.0 h1:iM5WgngdRBanHcxugY4JySA0nk1wZorNOpTgCMedv5E= +github.com/fxamacker/cbor/v2 v2.7.0/go.mod h1:pxXPTn3joSm21Gbwsv0w9OSA2y1HFR9qXEeXQVeNoDQ= +github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY= +github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY= +github.com/go-openapi/jsonpointer v0.19.6 h1:eCs3fxoIi3Wh6vtgmLTOjdhSpiqphQ+DaPn38N2ZdrE= +github.com/go-openapi/jsonpointer v0.19.6/go.mod h1:osyAmYz/mB/C3I+WsTTSgw1ONzaLJoLCyoi6/zppojs= +github.com/go-openapi/jsonreference v0.20.2 h1:3sVjiK66+uXK/6oQ8xgcRKcFgQ5KXa2KvnJRumpMGbE= +github.com/go-openapi/jsonreference v0.20.2/go.mod h1:Bl1zwGIM8/wsvqjsOQLJ/SH+En5Ap4rVB5KVcIDZG2k= +github.com/go-openapi/swag v0.22.3/go.mod h1:UzaqsxGiab7freDnrUUra0MwWfN/q7tE4j+VcZ0yl14= +github.com/go-openapi/swag v0.22.4 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h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/internal/pkg/logs/README.md b/internal/pkg/logs/README.md new file mode 100644 index 0000000..254142a --- /dev/null +++ b/internal/pkg/logs/README.md @@ -0,0 +1,96 @@ +# Logs + +Provides a helper to tail the Kubernetes deployment logs. Usage looks like: + +```golang +tailer, done := logs.Logger{ + Deployment: "mydeployment", + Namespace: "mynamespace", +}.Start() +defer func() { + err := done() // closes the tailer + if err != nil { ... } +}() + +for line := range tailer.NextLine() { + // Do something +} +``` + +## Features + +- Tail logs from Kubernetes deployments +- Supports in-cluster and out-of-cluster configurations +- Automatic pod and container discovery +- Configurable timeout +- Support for tailing specific number of lines + +## Usage + +### Basic Usage + +```golang +tailer, done := logs.Logger{ + Deployment: "mydeployment", + Namespace: "mynamespace", +}.Start() +defer func() { + err := done() + if err != nil { + // handle error + } +}() + +for line := range tailer.NextLine() { + fmt.Println(line) +} +``` + +### Advanced Usage + +```golang +// Tail from a specific pod and container +tailer, done := logs.Logger{ + Deployment: "mydeployment", + Namespace: "mynamespace", + Pod: "mydeployment-7b5b5c8c9d-xyz12", + Container: "mycontainer", + TailLines: int64Ptr(100), // Tail last 100 lines + Timeout: 5 * time.Minute, +}.Start() +defer func() { + err := done() + if err != nil { + // handle error + } +}() + +for line := range tailer.NextLine() { + fmt.Println(line) +} +``` + +### Helper Functions + +```golang +// Helper to create a pointer to int64 +func int64Ptr(i int64) *int64 { + return &i +} +``` + +## Configuration + +The Logger struct accepts the following fields: + +- `Deployment` (required): Name of the Kubernetes deployment +- `Namespace` (required): Kubernetes namespace +- `Pod` (optional): Specific pod name to tail logs from +- `Container` (optional): Specific container name to tail logs from +- `TailLines` (optional): Number of lines to tail from the end of logs +- `Timeout` (optional): Time to wait before giving up on tailing + +## Requirements + +- Kubernetes cluster access (in-cluster or via kubeconfig) +- Proper RBAC permissions to read pod logs \ No newline at end of file diff --git a/internal/pkg/logs/logs.go b/internal/pkg/logs/logs.go new file mode 100644 index 0000000..7f8fd13 --- /dev/null +++ b/internal/pkg/logs/logs.go @@ -0,0 +1,203 @@ +package logs + +import ( + "bufio" + "context" + "fmt" + "time" + + corev1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/rest" + "k8s.io/client-go/tools/clientcmd" +) + +// Logger represents a Kubernetes log tailer +type Logger struct { + // Deployment name + Deployment string + // Namespace name + Namespace string + // Optional: Pod name (if specified, will tail logs from this specific pod) + Pod string + // Optional: Container name (if specified, will tail logs from this specific container) + Container string + // Optional: Number of lines to tail from the end of the logs + // If not specified, will tail from the beginning + TailLines *int64 + // Optional: Time to wait before giving up on tailing + Timeout time.Duration +} + +// Tailer represents a running log tailer +type Tailer struct { + lines chan string + done chan struct{} +} + +// NextLine returns a channel that will receive log lines +func (t *Tailer) NextLine() <-chan string { + return t.lines +} + +// Stop stops the tailer and closes the line channel +func (t *Tailer) Stop() { + close(t.done) +} + +// Start starts the log tailer +func (l *Logger) Start() (*Tailer, func() error) { + tailer := &Tailer{ + lines: make(chan string), + done: make(chan struct{}), + } + + // Create Kubernetes client + client, err := l.createKubernetesClient() + if err != nil { + close(tailer.lines) + return tailer, func() error { return err } + } + + // Get pod name if not specified + podName := l.Pod + if podName == "" { + podName, err = l.getPodName(client) + if err != nil { + close(tailer.lines) + return tailer, func() error { return err } + } + } + + // Get container name if not specified + containerName := l.Container + if containerName == "" { + containerName, err = l.getContainerName(client, podName) + if err != nil { + close(tailer.lines) + return tailer, func() error { return err } + } + } + + // Start tailing logs + go l.tailLogs(client, podName, containerName, tailer) + + return tailer, func() error { + tailer.Stop() + return nil + } +} + +func (l *Logger) createKubernetesClient() (*kubernetes.Clientset, error) { + // Try to load in-cluster config first + config, err := rest.InClusterConfig() + if err != nil { + // If in-cluster config fails, try kubeconfig + loadingRules := clientcmd.NewDefaultClientConfigLoadingRules() + configOverrides := &clientcmd.ConfigOverrides{} + kubeConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, configOverrides) + config, err = kubeConfig.ClientConfig() + if err != nil { + return nil, fmt.Errorf("failed to create kubernetes client: %w", err) + } + } + + client, err := kubernetes.NewForConfig(config) + if err != nil { + return nil, fmt.Errorf("failed to create kubernetes client: %w", err) + } + + return client, nil +} + +func (l *Logger) getPodName(client *kubernetes.Clientset) (string, error) { + // List pods with the deployment label + podList, err := client.CoreV1().Pods(l.Namespace).List(context.TODO(), metav1.ListOptions{ + LabelSelector: fmt.Sprintf("app=%s", l.Deployment), + }) + if err != nil { + return "", fmt.Errorf("failed to list pods: %w", err) + } + + if len(podList.Items) == 0 { + return "", fmt.Errorf("no pods found for deployment %s in namespace %s", l.Deployment, l.Namespace) + } + + // Return the first pod that's running + for _, pod := range podList.Items { + if pod.Status.Phase == corev1.PodRunning { + return pod.Name, nil + } + } + + // If no running pods, return the first pod + return podList.Items[0].Name, nil +} + +func (l *Logger) getContainerName(client *kubernetes.Clientset, podName string) (string, error) { + pod, err := client.CoreV1().Pods(l.Namespace).Get(context.TODO(), podName, metav1.GetOptions{}) + if err != nil { + return "", fmt.Errorf("failed to get pod %s: %w", podName, err) + } + + if len(pod.Spec.Containers) == 0 { + return "", fmt.Errorf("pod %s has no containers", podName) + } + + // Return the first container name + return pod.Spec.Containers[0].Name, nil +} + +func (l *Logger) tailLogs(client *kubernetes.Clientset, podName, containerName string, tailer *Tailer) { + defer close(tailer.lines) + + // Prepare log request + logOpts := &corev1.PodLogOptions{ + Container: containerName, + Follow: true, + } + + if l.TailLines != nil { + logOpts.TailLines = l.TailLines + } + + // Create context with timeout if specified + ctx := context.Background() + if l.Timeout > 0 { + var cancel context.CancelFunc + ctx, cancel = context.WithTimeout(ctx, l.Timeout) + defer cancel() + } + + // Get logs stream + req := client.CoreV1().Pods(l.Namespace).GetLogs(podName, logOpts) + logsStream, err := req.Stream(ctx) + if err != nil { + select { + case tailer.lines <- fmt.Sprintf("Error: failed to get logs stream: %v", err): + case <-tailer.done: + return + } + return + } + defer logsStream.Close() + + // Read logs line by line + scanner := bufio.NewScanner(logsStream) + for scanner.Scan() { + select { + case tailer.lines <- scanner.Text(): + case <-tailer.done: + return + } + } + + if err := scanner.Err(); err != nil { + select { + case tailer.lines <- fmt.Sprintf("Error: failed to read logs: %v", err): + case <-tailer.done: + return + } + } +} diff --git a/internal/pkg/logs/logs_test.go b/internal/pkg/logs/logs_test.go new file mode 100644 index 0000000..bdff0a1 --- /dev/null +++ b/internal/pkg/logs/logs_test.go @@ -0,0 +1,57 @@ +package logs + +import ( + "testing" + "time" + + "github.com/stretchr/testify/assert" +) + +func TestLogger(t *testing.T) { + // This is a basic test to ensure the structure compiles correctly + // Actual integration testing would require a Kubernetes cluster + + logger := Logger{ + Deployment: "test-deployment", + Namespace: "test-namespace", + } + + // Test that the struct can be created + assert.NotNil(t, logger) + assert.Equal(t, "test-deployment", logger.Deployment) + assert.Equal(t, "test-namespace", logger.Namespace) +} + +func TestTailer(t *testing.T) { + // Test tailer creation and methods + tailer := &Tailer{ + lines: make(chan string), + done: make(chan struct{}), + } + + // Test NextLine method + lineChan := tailer.NextLine() + assert.NotNil(t, lineChan) + + // Test Stop method + tailer.Stop() + + // Verify the done channel is closed + select { + case _, ok := <-tailer.done: + assert.False(t, ok, "done channel should be closed") + default: + assert.Fail(t, "done channel should be closed") + } +} + +func TestTimeout(t *testing.T) { + // Test that timeout is handled correctly in Logger + logger := Logger{ + Deployment: "test-deployment", + Namespace: "test-namespace", + Timeout: 100 * time.Millisecond, + } + + assert.Equal(t, 100*time.Millisecond, logger.Timeout) +}