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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:22:31 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:22:31 +0000 |
commit | 8d4f58e49b9dc7d3545651023a36729de773ad86 (patch) | |
tree | 7bc7be4a8e9e298daa1349348400aa2a653866f2 /libnetdata/eval/eval.h | |
parent | Initial commit. (diff) | |
download | netdata-upstream.tar.xz netdata-upstream.zip |
Adding upstream version 1.12.0.upstream/1.12.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | libnetdata/eval/eval.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/libnetdata/eval/eval.h b/libnetdata/eval/eval.h new file mode 100644 index 0000000..57dae9d --- /dev/null +++ b/libnetdata/eval/eval.h @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#ifndef NETDATA_EVAL_H +#define NETDATA_EVAL_H 1 + +#include "../libnetdata.h" + +#define EVAL_MAX_VARIABLE_NAME_LENGTH 300 + +typedef enum rrdcalc_status { + RRDCALC_STATUS_REMOVED = -2, + RRDCALC_STATUS_UNDEFINED = -1, + RRDCALC_STATUS_UNINITIALIZED = 0, + RRDCALC_STATUS_CLEAR = 1, + RRDCALC_STATUS_RAISED = 2, + RRDCALC_STATUS_WARNING = 3, + RRDCALC_STATUS_CRITICAL = 4 +} RRDCALC_STATUS; + +typedef struct eval_variable { + char *name; + uint32_t hash; + struct eval_variable *next; +} EVAL_VARIABLE; + +typedef struct eval_expression { + const char *source; + const char *parsed_as; + + RRDCALC_STATUS *status; + calculated_number *this; + time_t *after; + time_t *before; + + calculated_number result; + + int error; + BUFFER *error_msg; + + // hidden EVAL_NODE * + void *nodes; + + // custom data to be used for looking up variables + struct rrdcalc *rrdcalc; +} EVAL_EXPRESSION; + +#define EVAL_VALUE_INVALID 0 +#define EVAL_VALUE_NUMBER 1 +#define EVAL_VALUE_VARIABLE 2 +#define EVAL_VALUE_EXPRESSION 3 + +// parsing and evaluation +#define EVAL_ERROR_OK 0 + +// parsing errors +#define EVAL_ERROR_MISSING_CLOSE_SUBEXPRESSION 1 +#define EVAL_ERROR_UNKNOWN_OPERAND 2 +#define EVAL_ERROR_MISSING_OPERAND 3 +#define EVAL_ERROR_MISSING_OPERATOR 4 +#define EVAL_ERROR_REMAINING_GARBAGE 5 +#define EVAL_ERROR_IF_THEN_ELSE_MISSING_ELSE 6 + +// evaluation errors +#define EVAL_ERROR_INVALID_VALUE 101 +#define EVAL_ERROR_INVALID_NUMBER_OF_OPERANDS 102 +#define EVAL_ERROR_VALUE_IS_NAN 103 +#define EVAL_ERROR_VALUE_IS_INFINITE 104 +#define EVAL_ERROR_UNKNOWN_VARIABLE 105 + +// parse the given string as an expression and return: +// a pointer to an expression if it parsed OK +// NULL in which case the pointer to error has the error code +extern EVAL_EXPRESSION *expression_parse(const char *string, const char **failed_at, int *error); + +// free all resources allocated for an expression +extern void expression_free(EVAL_EXPRESSION *expression); + +// convert an error code to a message +extern const char *expression_strerror(int error); + +// evaluate an expression and return +// 1 = OK, the result is in: expression->result +// 2 = FAILED, the error message is in: buffer_tostring(expression->error_msg) +extern int expression_evaluate(EVAL_EXPRESSION *expression); + +extern int health_variable_lookup(const char *variable, uint32_t hash, struct rrdcalc *rc, calculated_number *result); + +#endif //NETDATA_EVAL_H |