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MINOR: log: explicit typecasting for logformat nodes

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Add the ability to manually specify desired output type after a custom
field name for logformat nodes. Forcing the type can be useful to ensure
value is stored with the proper type representation. (i.e.: forcing
numerical to string to work around the limited resolution of JS number
types)

By default, type is set to SMP_T_SAME, which means the original type will
be preserved.

Currently supported types are: bool, str, sint
This commit is contained in:
Aurelien DARRAGON 2024-02-20 10:29:49 +01:00
parent 0cfcc64b79
commit 1448478d62
2 changed files with 31 additions and 7 deletions
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2
include/haproxy/log-t.h
View File

@ -201,6 +201,7 @@ enum {
LF_VAR, // variable name, after '%' or '%{..}'
LF_STARTVAR, // % in text
LF_STONAME, // after '%(' and before ')'
LF_STOTYPE, // after ':' while in STONAME
LF_EDONAME, // ')' after '%('
LF_STARG, // after '%{' and berore '}'
LF_EDARG, // '}' after '%{'
@ -214,6 +215,7 @@ struct logformat_node {
struct list list;
int type; // LOG_FMT_*
int options; // LOG_OPT_*
int typecast; // explicit typecasting for printing purposes (SMP_T_{SAME,BOOL,STR,SINT})
char *name; // printable name for output types that require named fields (ie: json)
char *arg; // text for LOG_FMT_TEXT, arg for others
void *expr; // for use with LOG_FMT_EXPR

36
src/log.c
View File

@ -306,7 +306,7 @@ int parse_logformat_var_args(char *args, struct logformat_node *node, char **err
* ignored when arg_len is 0. Neither <var> nor <var_len> may be null.
* Returns false in error case and err is filled, otherwise returns true.
*/
int parse_logformat_var(char *arg, int arg_len, char *name, int name_len, char *var, int var_len, struct proxy *curproxy, struct list *list_format, int *defoptions, char **err)
int parse_logformat_var(char *arg, int arg_len, char *name, int name_len, int typecast, char *var, int var_len, struct proxy *curproxy, struct list *list_format, int *defoptions, char **err)
{
int j;
struct logformat_node *node = NULL;
@ -321,6 +321,7 @@ int parse_logformat_var(char *arg, int arg_len, char *name, int name_len, char *
goto error_free;
}
node->type = logformat_keywords[j].type;
node->typecast = typecast;
if (name)
node->name = my_strndup(name, name_len);
node->options = *defoptions;
@ -412,7 +413,7 @@ int add_to_logformat_list(char *start, char *end, int type, struct list *list_fo
*
* In error case, the function returns 0, otherwise it returns 1.
*/
int add_sample_to_logformat_list(char *text, char *name, int name_len, char *arg, int arg_len, struct proxy *curpx, struct list *list_format, int options, int cap, char **err, char **endptr)
int add_sample_to_logformat_list(char *text, char *name, int name_len, int typecast, char *arg, int arg_len, struct proxy *curpx, struct list *list_format, int options, int cap, char **err, char **endptr)
{
char *cmd[2];
struct sample_expr *expr = NULL;
@ -438,6 +439,7 @@ int add_sample_to_logformat_list(char *text, char *name, int name_len, char *arg
if (name)
node->name = my_strndup(name, name_len);
node->type = LOG_FMT_EXPR;
node->typecast = typecast;
node->expr = expr;
node->options = options;
@ -506,9 +508,11 @@ int parse_logformat_string(const char *fmt, struct proxy *curproxy, struct list
char *arg = NULL; /* start pointer for args */
char *var = NULL; /* start pointer for vars */
char *name = NULL; /* token name (optional) */
char *typecast_str = NULL; /* token output type (if custom name is set) */
int arg_len = 0;
int var_len = 0;
int name_len = 0;
int typecast = SMP_T_SAME; /* relaxed by default */
int cformat; /* current token format */
int pformat; /* previous token format */
struct logformat_node *tmplf, *back;
@ -544,6 +548,7 @@ int parse_logformat_string(const char *fmt, struct proxy *curproxy, struct list
arg = NULL; var = NULL;
name = NULL;
name_len = 0;
typecast = SMP_T_SAME;
arg_len = var_len = 0;
if (*str == '(') { // custom output name
cformat = LF_STONAME;
@ -554,9 +559,26 @@ int parse_logformat_string(const char *fmt, struct proxy *curproxy, struct list
break;
case LF_STONAME: // text immediately following '%('
if (*str == ')') { // end of custom output name
cformat = LF_EDONAME;
case LF_STOTYPE:
if (cformat == LF_STONAME && *str == ':') { // start custom output type
cformat = LF_STOTYPE;
name_len = str -name;
typecast_str = str + 1;
}
else if (*str == ')') { // end of custom output name
if (cformat == LF_STONAME)
name_len = str - name;
else {
/* custom type */
*str = 0; // so that typecast_str is 0 terminated
typecast = type_to_smp(typecast_str);
if (typecast != SMP_T_STR && typecast != SMP_T_SINT &&
typecast != SMP_T_BOOL) {
memprintf(err, "unexpected output type '%.*s' at position %d line : '%s'. Supported types are: str, sint, bool", (int)(str - typecast_str), typecast_str, (int)(typecast_str - backfmt), fmt);
goto fail;
}
}
cformat = LF_EDONAME;
} else if (!isalnum((unsigned char)*str) && *str != '_' && *str != '-') {
memprintf(err, "invalid character in custom name near '%c' at position %d line : '%s'",
*str, (int)(str - backfmt), fmt);
@ -623,7 +645,7 @@ int parse_logformat_string(const char *fmt, struct proxy *curproxy, struct list
* part of the expression, which MUST be the trailing
* angle bracket.
*/
if (!add_sample_to_logformat_list(var, name, name_len, arg, arg_len, curproxy, list_format, options, cap, err, &str))
if (!add_sample_to_logformat_list(var, name, name_len, typecast, arg, arg_len, curproxy, list_format, options, cap, err, &str))
goto fail;
if (*str == ']') {
@ -669,7 +691,7 @@ int parse_logformat_string(const char *fmt, struct proxy *curproxy, struct list
if (cformat != pformat || pformat == LF_SEPARATOR) {
switch (pformat) {
case LF_VAR:
if (!parse_logformat_var(arg, arg_len, name, name_len, var, var_len, curproxy, list_format, &options, err))
if (!parse_logformat_var(arg, arg_len, name, name_len, typecast, var, var_len, curproxy, list_format, &options, err))
goto fail;
break;
case LF_TEXT:
@ -682,7 +704,7 @@ int parse_logformat_string(const char *fmt, struct proxy *curproxy, struct list
}
}
if (pformat == LF_STARTVAR || pformat == LF_STARG || pformat == LF_STEXPR || pformat == LF_STONAME || pformat == LF_EDONAME) {
if (pformat == LF_STARTVAR || pformat == LF_STARG || pformat == LF_STEXPR || pformat == LF_STONAME || pformat == LF_STOTYPE || pformat == LF_EDONAME) {
memprintf(err, "truncated line after '%s'", var ? var : arg ? arg : "%");
goto fail;
}