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-rw-r--r--internal/trace/trace.go55
1 files changed, 55 insertions, 0 deletions
diff --git a/internal/trace/trace.go b/internal/trace/trace.go
new file mode 100644
index 0000000..3e15c5b
--- /dev/null
+++ b/internal/trace/trace.go
@@ -0,0 +1,55 @@
+package trace
+
+import (
+ "fmt"
+ "log"
+ "os"
+ "sync/atomic"
+)
+
+var (
+ // logger is the logger to use for tracing.
+ logger = newLogger()
+
+ // current is the targets that are enabled for tracing.
+ current atomic.Int32
+)
+
+func newLogger() *log.Logger {
+ return log.New(os.Stderr, "", log.Ltime|log.Lmicroseconds|log.Lshortfile)
+}
+
+// Target is a tracing target.
+type Target int32
+
+const (
+ // General traces general operations.
+ General Target = 1 << iota
+
+ // Packet traces git packets.
+ Packet
+)
+
+// SetTarget sets the tracing targets.
+func SetTarget(target Target) {
+ current.Store(int32(target))
+}
+
+// SetLogger sets the logger to use for tracing.
+func SetLogger(l *log.Logger) {
+ logger = l
+}
+
+// Print prints the given message only if the target is enabled.
+func (t Target) Print(args ...interface{}) {
+ if int32(t)&current.Load() != 0 {
+ logger.Output(2, fmt.Sprint(args...)) // nolint: errcheck
+ }
+}
+
+// Printf prints the given message only if the target is enabled.
+func (t Target) Printf(format string, args ...interface{}) {
+ if int32(t)&current.Load() != 0 {
+ logger.Output(2, fmt.Sprintf(format, args...)) // nolint: errcheck
+ }
+}