refactor: finished refactoring server-side code

pkg/assert/assert.go

@@ -1,25 +1,94 @@
 package assert
 
-import "log"
+import (
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"runtime/debug"
+	"sync"
+)
 
-func Assert(assertion bool, message string, a ...any) {
+var (
+	writer io.Writer = os.Stderr
+
+	flushes = []io.Closer{}
+	flushMu sync.Mutex
+
+	assertData = map[string]any{}
+	mapMu      sync.Mutex
+)
+
+func AddData(key string, value any) {
+	mapMu.Lock()
+	assertData[key] = value
+	mapMu.Unlock()
+}
+
+func RemoveData(key string) {
+	mapMu.Lock()
+	delete(assertData, key)
+	mapMu.Unlock()
+}
+
+func AddFlush(flusher io.Closer) {
+	flushMu.Lock()
+	flushes = append(flushes, flusher)
+	flushMu.Unlock()
+}
+
+func SetWriter(w io.Writer) {
+	writer = w
+}
+
+func runAssert(message string, args ...any) {
+	flushMu.Lock()
+	for len(flushes) != 0 {
+		flusher := flushes[len(flushes)-1]
+		flusher.Close()
+		flushes = flushes[:len(flushes)-1]
+	}
+	flushMu.Unlock()
+
+	values := []any{
+		"msg", message,
+	}
+	values = append(values, args...)
+	mapMu.Lock()
+	for k, v := range assertData {
+		values = append(values, k, v)
+	}
+	mapMu.Unlock()
+
+	fmt.Fprintf(writer, "ARGS: %+v\n", args)
+	fmt.Fprintf(writer, "ASSERT\n")
+	for i := 0; i < len(values); i += 2 {
+		fmt.Fprintf(writer, "   %s=%v\n", values[i], values[i+1])
+	}
+	fmt.Fprintln(writer, string(debug.Stack()))
+
+	os.Exit(1)
+}
+
+func Assert(assertion bool, message string, args ...any) {
 	if !assertion {
-		log.Fatalf(message+"\n", a...)
+		runAssert(message, args...)
 	}
 }
 
-func NoError(err error, message string, a ...any) {
+func NoError(err error, message string, args ...any) {
 	if err != nil {
-		log.Fatalf(message+": "+err.Error()+"\n", a...)
+		args = append(args, "error", err)
+		runAssert(message, args...)
 	}
 }
 
-func Never(message string, a ...any) {
-	log.Fatalf(message+"\n", a...)
+func Never(message string, args ...any) {
+	runAssert(message, args...)
 }
 
-func NotNil(value any, message string, a ...any) {
-	if value == nil {
-		log.Fatalf(message+"\n", a...)
+func NotNil(value any, message string, args ...any) {
+	if value == nil || reflect.ValueOf(value).Kind() == reflect.Ptr && reflect.ValueOf(value).IsNil() {
+		runAssert(message, args...)
 	}
 }