Move the bulk of ssb.privateMessageEncrypt work (CPU + DB) off the main thread.

src/ssb.tests.c

@@ -819,3 +819,42 @@ void tf_ssb_test_go_ssb_room(const tf_test_options_t* options)
 
 	uv_loop_close(&loop);
 }
+
+static void _write_file(const char* path, const char* contents)
+{
+	FILE* file = fopen(path, "w");
+	if (!file)
+	{
+		printf("Unable to write %s: %s.\n", path, strerror(errno));
+		fflush(stdout);
+		abort();
+	}
+	fputs(contents, file);
+	fclose(file);
+}
+
+#define TEST_ARGS " --ssb-port=0 --http-port=0 --https-port=0"
+
+void tf_ssb_test_encrypt(const tf_test_options_t* options)
+{
+	_write_file("out/test.js",
+		"async function main() {\n"
+		"	let a = await ssb.createIdentity('test');\n"
+		"	let b = await ssb.createIdentity('test');\n"
+		"	let c = await ssb.privateMessageEncrypt('test', a, [a, b], {'foo': 1});\n"
+		"	if (!c.endsWith('.box')) {\n"
+		"		exit(1);\n"
+		"	}\n"
+		"}\n"
+		"main().catch(() => exit(2));\n");
+
+	unlink("out/testdb.sqlite");
+	char command[256];
+	snprintf(command, sizeof(command), "%s run --db-path=out/testdb.sqlite -s out/test.js" TEST_ARGS, options->exe_path);
+	tf_printf("%s\n", command);
+	int result = system(command);
+	(void)result;
+	assert(WIFEXITED(result));
+	printf("returned %d\n", WEXITSTATUS(result));
+	assert(WEXITSTATUS(result) == 0);
+}