Print capabilities of data store at start time

cmd/tusd/main.go

@@ -106,6 +106,8 @@ func main() {
 	address := httpHost + ":" + httpPort
 	stdout.Printf("Using %s as address to listen.\n", address)
 
+	stdout.Printf(composer.Capabilities())
+
 	go func() {
 		for {
 			select {

composer.go

@@ -42,6 +42,49 @@ func NewStoreComposerFromDataStore(store DataStore) *StoreComposer {
 	return composer
 }
 
+func (store *StoreComposer) Capabilities() string {
+	str := "Core: "
+
+	if store.Core != nil {
+		str += "✓"
+	} else {
+		str += "✗"
+	}
+
+	str += ` Terminater: `
+	if store.UsesTerminater {
+		str += "✓"
+	} else {
+		str += "✗"
+	}
+	str += ` Finisher: `
+	if store.UsesFinisher {
+		str += "✓"
+	} else {
+		str += "✗"
+	}
+	str += ` Locker: `
+	if store.UsesLocker {
+		str += "✓"
+	} else {
+		str += "✗"
+	}
+	str += ` GetReader: `
+	if store.UsesGetReader {
+		str += "✓"
+	} else {
+		str += "✗"
+	}
+	str += ` Concater: `
+	if store.UsesConcater {
+		str += "✓"
+	} else {
+		str += "✗"
+	}
+
+	return str
+}
+
 func (store *StoreComposer) UseCore(core DataStore) {
 	store.Core = core
 }

composer.mgo

@@ -12,6 +12,13 @@ package tusd
   composer.Use ## TYPE (mod) \
 }
 
+#define USE_CAP(TYPE) str += ` TYPE: `; \
+if store.Uses ## TYPE { \
+  str += "✓" \
+} else { \
+  str += "✗" \
+}
+
 type StoreComposer struct {
   Core DataStore
 
@@ -39,6 +46,24 @@ func NewStoreComposerFromDataStore(store DataStore) *StoreComposer {
   return composer
 }
 
+func (store *StoreComposer) Capabilities() string {
+  str := "Core: "
+
+  if store.Core != nil {
+    str += "✓"
+  } else {
+    str += "✗"
+  }
+
+  USE_CAP(Terminater)
+  USE_CAP(Finisher)
+  USE_CAP(Locker)
+  USE_CAP(GetReader)
+  USE_CAP(Concater)
+
+  return str
+}
+
 func (store *StoreComposer) UseCore(core DataStore) {
   store.Core = core
 }