refactor: simplify exponential backoff and refactor env (#1185)

Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>

frankenphp.go

@@ -505,88 +505,6 @@ func ServeHTTP(responseWriter http.ResponseWriter, request *http.Request) error
 	return nil
 }
 
-//export go_putenv
-func go_putenv(str *C.char, length C.int) C.bool {
-	// Create a byte slice from C string with a specified length
-	s := C.GoBytes(unsafe.Pointer(str), length)
-
-	// Convert byte slice to string
-	envString := string(s)
-
-	// Check if '=' is present in the string
-	if key, val, found := strings.Cut(envString, "="); found {
-		if os.Setenv(key, val) != nil {
-			return false // Failure
-		}
-	} else {
-		// No '=', unset the environment variable
-		if os.Unsetenv(envString) != nil {
-			return false // Failure
-		}
-	}
-
-	return true // Success
-}
-
-//export go_getfullenv
-func go_getfullenv(threadIndex C.uintptr_t) (*C.go_string, C.size_t) {
-	thread := phpThreads[threadIndex]
-
-	env := os.Environ()
-	goStrings := make([]C.go_string, len(env)*2)
-
-	for i, envVar := range env {
-		key, val, _ := strings.Cut(envVar, "=")
-		k := unsafe.StringData(key)
-		v := unsafe.StringData(val)
-		thread.Pin(k)
-		thread.Pin(v)
-
-		goStrings[i*2] = C.go_string{C.size_t(len(key)), (*C.char)(unsafe.Pointer(k))}
-		goStrings[i*2+1] = C.go_string{C.size_t(len(val)), (*C.char)(unsafe.Pointer(v))}
-	}
-
-	value := unsafe.SliceData(goStrings)
-	thread.Pin(value)
-
-	return value, C.size_t(len(env))
-}
-
-//export go_getenv
-func go_getenv(threadIndex C.uintptr_t, name *C.go_string) (C.bool, *C.go_string) {
-	thread := phpThreads[threadIndex]
-
-	// Create a byte slice from C string with a specified length
-	envName := C.GoStringN(name.data, C.int(name.len))
-
-	// Get the environment variable value
-	envValue, exists := os.LookupEnv(envName)
-	if !exists {
-		// Environment variable does not exist
-		return false, nil // Return 0 to indicate failure
-	}
-
-	// Convert Go string to C string
-	val := unsafe.StringData(envValue)
-	thread.Pin(val)
-	value := &C.go_string{C.size_t(len(envValue)), (*C.char)(unsafe.Pointer(val))}
-	thread.Pin(value)
-
-	return true, value // Return 1 to indicate success
-}
-
-//export go_sapi_getenv
-func go_sapi_getenv(threadIndex C.uintptr_t, name *C.go_string) *C.char {
-	envName := C.GoStringN(name.data, C.int(name.len))
-
-	envValue, exists := os.LookupEnv(envName)
-	if !exists {
-		return nil
-	}
-
-	return phpThreads[threadIndex].pinCString(envValue)
-}
-
 //export go_handle_request
 func go_handle_request(threadIndex C.uintptr_t) bool {
 	select {