[syslog-ng] [PATCH (3.5)] log_template_compile: function refactorized
Juhász Viktor
jviktor at balabit.hu
Tue Sep 3 11:16:55 CEST 2013
From: Juhasz Viktor <jviktor at balabit.hu>
implementation of LogTemplateCompiler object helps to understand the
whole compile process and reduces the number of parameters of the
functions.
Some unit test cases added to the unit test.
The next possible step should be, that split the templates.c
file into more files.
This patch based on the log-template-refactor branch
Signed-off-by: Juhasz Viktor <jviktor at balabit.hu>
---
lib/template/templates.c | 609 ++++++++++++++++------------
lib/template/tests/test_template_compile.c | 16 +
2 files changed, 366 insertions(+), 259 deletions(-)
diff --git a/lib/template/templates.c b/lib/template/templates.c
index 1454cd2..13abf57 100644
--- a/lib/template/templates.c
+++ b/lib/template/templates.c
@@ -653,6 +653,13 @@ log_macro_lookup(gchar *macro, gint len)
return macro_id;
}
+typedef struct {
+ LogTemplate *template;
+ gchar *cursor;
+ GString *text;
+ gint msg_ref;
+} LogTemplateCompiler;
+
enum
{
LTE_MACRO,
@@ -785,43 +792,43 @@ log_template_reset_compiled(LogTemplate *self)
}
static void
-log_template_add_macro_elem(LogTemplate *self, guint macro, GString *text, gchar *default_value, gint msg_ref)
+log_template_add_macro_elem(LogTemplateCompiler *self, guint macro, gchar *default_value)
{
LogTemplateElem *e;
e = g_new0(LogTemplateElem, 1);
e->type = LTE_MACRO;
- e->text_len = text ? text->len : 0;
- e->text = text ? g_strndup(text->str, text->len) : NULL;
+ e->text_len = self->text ? self->text->len : 0;
+ e->text = self->text ? g_strndup(self->text->str, self->text->len) : NULL;
e->macro = macro;
e->default_value = default_value;
- e->msg_ref = msg_ref;
- self->compiled_template = g_list_prepend(self->compiled_template, e);
+ e->msg_ref = self->msg_ref;
+ self->template->compiled_template = g_list_prepend(self->template->compiled_template, e);
}
static void
-log_template_add_value_elem(LogTemplate *self, gchar *value_name, gsize value_name_len, GString *text, gchar *default_value, gint msg_ref)
+log_template_add_value_elem(LogTemplateCompiler *self, gchar *value_name, gsize value_name_len, gchar *default_value)
{
LogTemplateElem *e;
gchar *dup;
e = g_new0(LogTemplateElem, 1);
e->type = LTE_VALUE;
- e->text_len = text ? text->len : 0;
- e->text = text ? g_strndup(text->str, text->len) : NULL;
+ e->text_len = self->text ? self->text->len : 0;
+ e->text = self->text ? g_strndup(self->text->str, self->text->len) : NULL;
/* value_name is not NUL terminated */
dup = g_strndup(value_name, value_name_len);
e->value_handle = log_msg_get_value_handle(dup);
g_free(dup);
e->default_value = default_value;
- e->msg_ref = msg_ref;
- self->compiled_template = g_list_prepend(self->compiled_template, e);
+ e->msg_ref = self->msg_ref;
+ self->template->compiled_template = g_list_prepend(self->template->compiled_template, e);
}
/* NOTE: this steals argv if successful */
static gboolean
-log_template_add_func_elem(LogTemplate *self, GString *text, gint argc, gchar *argv[], gint msg_ref, GError **error)
+log_template_add_func_elem(LogTemplateCompiler *self, gint argc, gchar *argv[], GError **error)
{
LogTemplateElem *e;
Plugin *p;
@@ -834,11 +841,11 @@ log_template_add_func_elem(LogTemplate *self, GString *text, gint argc, gchar *a
e = g_malloc0(sizeof(LogTemplateElem) + (argc - 1) * sizeof(LogTemplate *));
e->type = LTE_FUNC;
- e->text_len = text ? text->len : 0;
- e->text = text ? g_strndup(text->str, text->len) : NULL;
- e->msg_ref = msg_ref;
+ e->text_len = self->text ? self->text->len : 0;
+ e->text = self->text ? g_strndup(self->text->str, self->text->len) : NULL;
+ e->msg_ref = self->msg_ref;
- p = plugin_find(self->cfg, LL_CONTEXT_TEMPLATE_FUNC, argv[0]);
+ p = plugin_find(self->template->cfg, LL_CONTEXT_TEMPLATE_FUNC, argv[0]);
if (!p)
{
g_set_error(error, LOG_TEMPLATE_ERROR, LOG_TEMPLATE_ERROR_COMPILE, "Unknown template function %s", argv[0]);
@@ -846,21 +853,21 @@ log_template_add_func_elem(LogTemplate *self, GString *text, gint argc, gchar *a
}
else
{
- e->func.ops = plugin_construct(p, self->cfg, LL_CONTEXT_TEMPLATE_FUNC, argv[0]);
+ e->func.ops = plugin_construct(p, self->template->cfg, LL_CONTEXT_TEMPLATE_FUNC, argv[0]);
}
e->func.state = g_malloc0(e->func.ops->size_of_state);
/* prepare may modify the argv array: remove and rearrange elements */
memcpy(argv_copy, argv, (argc + 1) * sizeof(argv[0]));
- if (!e->func.ops->prepare(e->func.ops, e->func.state, self, argc, argv_copy, error))
+ if (!e->func.ops->prepare(e->func.ops, e->func.state, self->template, argc, argv_copy, error))
{
e->func.ops->free_state(e->func.state);
g_free(e->func.state);
goto error;
}
g_strfreev(argv);
- self->compiled_template = g_list_prepend(self->compiled_template, e);
+ self->template->compiled_template = g_list_prepend(self->template->compiled_template, e);
return TRUE;
error:
@@ -870,283 +877,367 @@ log_template_add_func_elem(LogTemplate *self, GString *text, gint argc, gchar *a
return FALSE;
}
+static LogTemplateCompiler *
+log_template_compiler_new(LogTemplate *template)
+{
+ LogTemplateCompiler *self = g_new0(LogTemplateCompiler, 1);
+ self->template = log_template_ref(template);
+ self->cursor = self->template->template;
+ self->text = g_string_sized_new(32);
+ return self;
+}
+
static void
-parse_msg_ref(gchar **p, gint *msg_ref)
+log_template_compiler_free(LogTemplateCompiler *self)
{
- *msg_ref = 0;
- if ((**p) == '@')
+ log_template_unref(self->template);
+ g_string_free(self->text, TRUE);
+ g_free(self);
+}
+
+
+static void
+parse_msg_ref(LogTemplateCompiler *self)
+{
+ self->msg_ref = 0;
+ if ((*self->cursor) == '@')
{
- (*p)++;
+ self->cursor++;
/* syntax: ${name}@1 to denote the log message index in the correllation state */
- while ((**p) >= '0' && (**p) <= '9')
+ while ((*self->cursor) >= '0' && (*self->cursor) <= '9')
{
- (*msg_ref) += (*msg_ref) * 10 + ((**p) - '0');
- (*p)++;
+ self->msg_ref += self->msg_ref * 10 + ((*self->cursor) - '0');
+ self->cursor++;
}
- *msg_ref += 1;
+ self->msg_ref += 1;
}
}
-gboolean
-log_template_compile(LogTemplate *self, const gchar *template, GError **error)
+static void
+log_template_fill_compile_error(GError **error, const gchar *error_info, gint error_pos)
{
- gchar *start, *p;
- guint last_macro = M_NONE;
- GString *last_text = NULL;
- gchar *error_info;
- gint error_pos = 0;
+ g_set_error(error, LOG_TEMPLATE_ERROR, LOG_TEMPLATE_ERROR_COMPILE, "%s, error_pos='%d'", error_info, error_pos);
+}
- g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
+static void
+log_template_append_and_increment(LogTemplateCompiler *self, GString *text)
+{
+ g_string_append_c(text, *self->cursor);
+ self->cursor++;
+}
+
+static gint
+log_template_get_macro_length(gchar *start, gchar *end, gchar **token)
+{
+ gint result = 0;
+ gchar *colon = memchr(start, ':', end - start - 1);
+ if (colon)
+ {
+ result = colon - start;
+ *token = colon < end ? colon + 1 : NULL;
+ }
+ else
+ {
+ result = end - start - 1;
+ *token = NULL;
+ }
+ return result;
+}
- log_template_reset_compiled(self);
- if (self->template)
- g_free(self->template);
- self->template = g_strdup(template);
- p = self->template;
- while (*p)
+static gchar *
+log_template_compiler_get_default_value(LogTemplateCompiler *self, gchar *token)
+{
+ g_assert(token);
+ if (*token != '-')
{
- if (last_text == NULL)
- last_text = g_string_sized_new(32);
- if (*p == '\\')
+ return NULL;
+ }
+ return g_strndup(token + 1, self->cursor - token - 2);
+}
+
+static inline gboolean
+is_macro_name(gchar c)
+{
+ return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c == '_') || (c >= '0' && c <= '9');
+}
+
+#define STEP_BY_TRUE(p, x) while(x) p++;
+
+static void
+log_template_compiler_add_elem(LogTemplateCompiler *self, gchar *start, gint macro_len, gchar *default_value)
+{
+ gint macro = log_macro_lookup(start, macro_len);
+ if (macro == M_NONE)
+ {
+ log_template_add_value_elem(self, start, macro_len, default_value);
+ }
+ else
+ {
+ log_template_add_macro_elem(self, macro, default_value);
+ }
+}
+
+static gboolean
+log_template_compiler_process_braced_template(LogTemplateCompiler *self, GError **error)
+{
+ gint macro_len;
+ gchar *default_value = NULL;
+ gchar *start;
+ gchar *end;
+ gchar *token;
+
+ self->cursor++;
+ start = self->cursor;
+ end = strchr(self->cursor, '}');
+
+ if (!end)
+ {
+ log_template_fill_compile_error(error, "Invalid macro, '}' is missing", strlen(self->template->template));
+ return FALSE;
+ }
+
+ self->cursor = end + 1;
+ macro_len = log_template_get_macro_length(start, self->cursor, &token);
+ if (token)
+ {
+ default_value = log_template_compiler_get_default_value(self, token);
+ if (!default_value)
{
- p++;
- if (*p)
+ log_template_fill_compile_error(error, "Unknown substitution function", token - self->template->template);
+ return FALSE;
+ }
+ }
+ parse_msg_ref(self);
+ log_template_compiler_add_elem(self, start, macro_len, default_value);
+ return TRUE;
+}
+
+static gboolean
+log_template_compiler_add_quoted_string(LogTemplateCompiler *self, gboolean is_top_level, GString *result)
+{
+ gchar *quote = self->cursor;
+ gchar *end_of_quote = strchr(quote + 1, *quote);
+ if (!end_of_quote)
+ {
+ return FALSE;
+ }
+ self->cursor = end_of_quote + 1;
+ if (is_top_level)
+ {
+ /* skip the quote in top-level and don't skip in expressions enclosed in parens */
+ quote++;
+ }
+ else
+ {
+ end_of_quote++;
+ }
+ g_string_append_len(result, quote, end_of_quote - quote);
+ return TRUE;
+}
+
+static gboolean
+log_template_compiler_process_arg_list(LogTemplateCompiler *self, GPtrArray *result)
+{
+ GString *arg_buf = g_string_sized_new(32);
+ gint parens = 1;
+ self->cursor++;
+
+ while (*self->cursor && *self->cursor == ' ')
+ self->cursor++;
+
+ while(*self->cursor)
+ {
+ if (*self->cursor == '\\')
+ {
+ self->cursor++;
+ }
+ else if (*self->cursor == '(')
+ {
+ parens++;
+ }
+ else if (*self->cursor == ')')
+ {
+ parens--;
+ if (parens == 0)
{
- g_string_append_c(last_text, *p);
- p++;
+ break;
}
}
- else if (*p == '$')
+ else if (*self->cursor == '"' || *self->cursor == '\'')
{
- gboolean finished = FALSE;
- p++;
- /* macro reference */
- if (*p == '{')
+ if (!log_template_compiler_add_quoted_string(self, parens == 1, arg_buf))
{
- gchar *colon, *fncode;
- gint macro_len;
- gchar *default_value = NULL;
- gint msg_ref = 0;
+ g_ptr_array_add(result, NULL);
+ g_string_free(arg_buf, TRUE);
+ return FALSE;
+ }
+ continue;
+ }
+ else if (parens == 1 && (*self->cursor == ' ' || *self->cursor == '\t'))
+ {
+ g_ptr_array_add(result, g_strndup(arg_buf->str, arg_buf->len));
+ g_string_truncate(arg_buf, 0);
+ while (*self->cursor && (*self->cursor == ' ' || *self->cursor == '\t'))
+ self->cursor++;
+ continue;
+ }
+ log_template_append_and_increment(self, arg_buf);
+ }
+ if (arg_buf->len > 0)
+ {
+ g_ptr_array_add(result, g_strndup(arg_buf->str, arg_buf->len));
+ }
+ g_ptr_array_add(result, NULL);
+ g_string_free(arg_buf, TRUE);
+ return *self->cursor == ')';
+}
- p++;
- start = p;
- while (*p && *p != '}')
- p++;
+static gboolean
+log_template_compiler_process_template_function(LogTemplateCompiler *self, GError **error)
+{
+ GPtrArray *strv = g_ptr_array_new();
- if (!*p)
- {
- error_pos = p - self->template;
- error_info = "Invalid macro, '}' is missing";
- goto error;
- }
+ if (!log_template_compiler_process_arg_list(self, strv))
+ {
+ log_template_fill_compile_error(error, "Invalid template function reference, missing function name or inbalanced '('", self->cursor - self->template->template);
+ goto error;
+ }
+ self->cursor++;
- p++;
+ parse_msg_ref(self);
+ if (!log_template_add_func_elem(self, strv->len - 1, (gchar **) strv->pdata, error))
+ {
+ goto error;
+ }
+ g_ptr_array_free(strv, FALSE);
+ return TRUE;
+error:
+ g_strfreev((gchar **)strv->pdata);
+ g_ptr_array_free(strv, FALSE);
+ return FALSE;
+}
- colon = memchr(start, ':', p - start - 1);
- if (colon)
- {
- macro_len = colon - start;
- fncode = colon < p ? colon + 1 : NULL;
- }
- else
- {
- macro_len = p - start - 1;
- fncode = NULL;
- }
+static void
+log_template_compiler_process_unbraced_template(LogTemplateCompiler *self)
+{
+ gchar *start = self->cursor;
+ gint macro_len;
+ do
+ {
+ self->cursor++;
+ }
+ while (is_macro_name(*self->cursor));
+ macro_len = self->cursor - start;
+ log_template_compiler_add_elem(self, start, macro_len, NULL);
+}
- if (fncode)
- {
- if (*fncode == '-')
- {
- default_value = g_strndup(fncode + 1, p - fncode - 2);
- }
- else
- {
- error_pos = fncode - self->template;
- error_info = "Unknown substitution function";
- goto error;
- }
- }
- parse_msg_ref(&p, &msg_ref);
- last_macro = log_macro_lookup(start, macro_len);
- if (last_macro == M_NONE)
- {
- /* this was not a known macro, take it as a "value" reference */
- log_template_add_value_elem(self, start, macro_len, last_text, default_value, msg_ref);
- }
- else
- {
- log_template_add_macro_elem(self, last_macro, last_text, default_value, msg_ref);
- }
- finished = TRUE;
- }
- /* template function */
- else if (*p == '(')
- {
- gchar quote = 0;
- gint parens = 1;
- GPtrArray *strv;
- GString *arg_buf;
- gint msg_ref;
-
- strv = g_ptr_array_new();
- arg_buf = g_string_sized_new(32);
-
- p++;
- start = p;
- /* skip white space */
- while (*p && *p == ' ')
- p++;
-
- g_string_truncate(arg_buf, 0);
- while (*p)
- {
- if (!quote)
- {
- if (*p == '\\')
- {
- p++;
- }
- else if (*p == '"' || *p == '\'')
- {
- quote = *p;
- if (parens == 1)
- {
- /* skip the quote in top-level and don't skip in expressions enclosed in parens */
- p++;
- continue;
- }
- }
- else if (parens == 1 && (*p == ' ' || *p == '\t'))
- {
- g_ptr_array_add(strv, g_strndup(arg_buf->str, arg_buf->len));
- g_string_truncate(arg_buf, 0);
- while (*p && (*p == ' ' || *p == '\t'))
- p++;
- continue;
- }
- else if (*p == '(')
- {
- parens++;
- }
- else if (*p == ')')
- {
- parens--;
- if (parens == 0)
- break;
- }
- }
- else
- {
- if (quote == *p)
- {
- /* end of string */
- quote = 0;
- if (parens == 1)
- {
- p++;
- continue;
- }
- }
- }
- if (*p)
- {
- g_string_append_c(arg_buf, *p);
- p++;
- }
- }
+static gboolean
+log_template_compiler_process_value(LogTemplateCompiler *self, GError **error)
+{
+ gboolean finished = FALSE;
+ gchar p;
+ self->cursor++;
+ p = *self->cursor;
+ /* macro reference */
+ if (p == '{')
+ {
+ if (!log_template_compiler_process_braced_template(self, error))
+ {
+ return FALSE;
+ }
+ finished = TRUE;
+ }
+ /* template function */
+ else if (p == '(')
+ {
+ if (!log_template_compiler_process_template_function(self, error))
+ {
+ return FALSE;
+ }
+ finished = TRUE;
+ }
+ /* unbraced macro */
+ else if (is_macro_name(p))
+ {
+ log_template_compiler_process_unbraced_template(self);
+ finished = TRUE;
+ }
+ /* escaped value with dollar */
+ else
+ {
+ if (p != '$')
+ {
+ g_string_append_c(self->text, '$');
+ }
+ if (p)
+ {
+ log_template_append_and_increment(self, self->text);
+ }
+ }
+ if (finished)
+ {
+ g_string_truncate(self->text, 0);
+ }
+ return TRUE;
+}
- if (arg_buf->len)
- g_ptr_array_add(strv, g_strndup(arg_buf->str, arg_buf->len));
- g_ptr_array_add(strv, NULL);
- if (*p != ')')
- {
- g_string_free(arg_buf, TRUE);
- g_ptr_array_foreach(strv, (GFunc) g_free, NULL);
- g_ptr_array_free(strv, TRUE);
+gboolean
+log_template_compiler_process_token(LogTemplateCompiler *self, GError **error)
+{
+ self->msg_ref = 0;
+ if (*self->cursor == '$')
+ {
+ return log_template_compiler_process_value(self, error);
+ }
+ if (*self->cursor == '\\')
+ {
+ self->cursor++;
+ }
+ if (*self->cursor)
+ {
+ log_template_append_and_increment(self, self->text);
+ }
+ return TRUE;
+}
- error_pos = p - self->template;
- error_info = "Invalid template function reference, missing function name or inbalanced '('";
- goto error;
- }
- p++;
- parse_msg_ref(&p, &msg_ref);
- if (!log_template_add_func_elem(self, last_text, strv->len - 1, (gchar **) strv->pdata, msg_ref, error))
- {
- g_ptr_array_foreach(strv, (GFunc) g_free, NULL);
- g_ptr_array_free(strv, TRUE);
- g_string_free(arg_buf, TRUE);
- goto error_set;
- }
- g_ptr_array_free(strv, FALSE);
- g_string_free(arg_buf, TRUE);
- finished = TRUE;
- }
- else if ((*p >= 'A' && *p <= 'Z') || (*p >= 'a' && *p <= 'z') || (*p == '_') || (*p >= '0' && *p <= '9'))
- {
- start = p;
- do
- {
- p++;
- }
- while ((*p >= 'A' && *p <= 'Z') || (*p >= 'a' && *p <= 'z') || (*p == '_') || (*p >= '0' && *p <= '9'));
- last_macro = log_macro_lookup(start, p - start);
- if (last_macro == M_NONE)
- {
- /* this was not a known macro, take it as a "value" reference */
- log_template_add_value_elem(self, start, p-start, last_text, NULL, 0);
- }
- else
- {
- log_template_add_macro_elem(self, last_macro, last_text, NULL, 0);
- }
- finished = TRUE;
- }
- else if (*p == '$')
- {
- g_string_append_c(last_text, '$');
- p++;
- }
- else
- {
- g_string_append_c(last_text, '$');
- g_string_append_c(last_text, *p);
- p++;
- }
- if (finished)
- {
- if (last_text)
- g_string_free(last_text, TRUE);
- last_macro = M_NONE;
- last_text = NULL;
- }
- }
- else
+static gboolean
+log_template_compiler_compile(LogTemplateCompiler *self, GError **error)
+{
+ while(*self->cursor)
+ {
+ if (!log_template_compiler_process_token(self, error))
{
- g_string_append_c(last_text, *p);
- p++;
+ log_template_reset_compiled(self->template);
+ g_string_sprintf(self->text, "error in template: %s", self->template->template);
+ log_template_add_macro_elem(self, M_NONE, NULL);
+ return FALSE;
}
}
- if (last_macro != M_NONE || last_text)
+ if (self->text->len)
{
- log_template_add_macro_elem(self, last_macro, last_text, NULL, 0);
- g_string_free(last_text, TRUE);
+ log_template_add_macro_elem(self, M_NONE, NULL);
}
- self->compiled_template = g_list_reverse(self->compiled_template);
+ self->template->compiled_template = g_list_reverse(self->template->compiled_template);
return TRUE;
+}
- error:
- g_set_error(error, LOG_TEMPLATE_ERROR, LOG_TEMPLATE_ERROR_COMPILE, "%s, error_pos='%d'", error_info, error_pos);
+gboolean
+log_template_compile(LogTemplate *self, const gchar *template, GError **error)
+{
+ LogTemplateCompiler *compiler;
+ gboolean result;
+
+ g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
- error_set:
log_template_reset_compiled(self);
- if (!last_text)
- last_text = g_string_sized_new(0);
- g_string_sprintf(last_text, "error in template: %s", self->template);
- log_template_add_macro_elem(self, M_NONE, last_text, NULL, 0);
- g_string_free(last_text, TRUE);
- return FALSE;
+ if (self->template)
+ g_free(self->template);
+ self->template = g_strdup(template);
+ compiler = log_template_compiler_new(self);
+ result = log_template_compiler_compile(compiler, error);
+ log_template_compiler_free(compiler);
+ return result;
}
void
diff --git a/lib/template/tests/test_template_compile.c b/lib/template/tests/test_template_compile.c
index 5fe243e..efebfdd 100644
--- a/lib/template/tests/test_template_compile.c
+++ b/lib/template/tests/test_template_compile.c
@@ -334,11 +334,19 @@ test_simple_template_function_with_additional_text(void)
}
static void
+test_qouted_string_in_name_template_function(void)
+{
+ assert_template_compile("$(he\"ll\"o)");
+ assert_compiled_template(text = "", default_value = NULL, func.ops = hello_construct(&hello_plugin, configuration, LL_CONTEXT_TEMPLATE_FUNC, "hello"), type = LTE_FUNC, msg_ref = 0);
+}
+
+static void
test_template_compile_func(void)
{
TEMPLATE_TESTCASE(test_simple_template_function);
TEMPLATE_TESTCASE(test_complicated_template_function);
TEMPLATE_TESTCASE(test_simple_template_function_with_additional_text);
+ TEMPLATE_TESTCASE(test_qouted_string_in_name_template_function);
}
static void
@@ -372,6 +380,13 @@ test_template_function_bad2(void)
}
static void
+test_template_function_bad3(void)
+{
+ assert_failed_template_compile("$(hello \"This is an unclosed quoted string)", "Invalid template function reference, missing function name or inbalanced '(', error_pos='8'");
+ assert_compiled_template(text = "error in template: $(hello \"This is an unclosed quoted string)", default_value = NULL, macro = M_NONE, type = LTE_MACRO, msg_ref = 0);
+}
+
+static void
test_unknown_function(void)
{
assert_failed_template_compile("$(unknown function)", "Unknown template function unknown");
@@ -385,6 +400,7 @@ test_template_compile_negativ_tests(void)
TEMPLATE_TESTCASE(test_invalid_subst);
TEMPLATE_TESTCASE(test_template_function_bad1);
TEMPLATE_TESTCASE(test_template_function_bad2);
+ TEMPLATE_TESTCASE(test_template_function_bad3);
TEMPLATE_TESTCASE(test_unknown_function);
}
--
1.7.9.5
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