88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-3.0-or-later
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#ifndef NETDATA_EVAL_H
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#define NETDATA_EVAL_H 1
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#include "../libnetdata.h"
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#define EVAL_MAX_VARIABLE_NAME_LENGTH 300
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typedef enum rrdcalc_status {
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RRDCALC_STATUS_REMOVED = -2,
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RRDCALC_STATUS_UNDEFINED = -1,
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RRDCALC_STATUS_UNINITIALIZED = 0,
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RRDCALC_STATUS_CLEAR = 1,
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RRDCALC_STATUS_RAISED = 2,
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RRDCALC_STATUS_WARNING = 3,
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RRDCALC_STATUS_CRITICAL = 4
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} RRDCALC_STATUS;
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typedef struct eval_variable {
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STRING *name;
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struct eval_variable *next;
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} EVAL_VARIABLE;
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typedef struct eval_expression {
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const char *source;
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const char *parsed_as;
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RRDCALC_STATUS *status;
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NETDATA_DOUBLE *myself;
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time_t *after;
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time_t *before;
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NETDATA_DOUBLE result;
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int error;
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BUFFER *error_msg;
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// hidden EVAL_NODE *
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void *nodes;
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// custom data to be used for looking up variables
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struct rrdcalc *rrdcalc;
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} EVAL_EXPRESSION;
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#define EVAL_VALUE_INVALID 0
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#define EVAL_VALUE_NUMBER 1
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#define EVAL_VALUE_VARIABLE 2
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#define EVAL_VALUE_EXPRESSION 3
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// parsing and evaluation
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#define EVAL_ERROR_OK 0
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// parsing errors
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#define EVAL_ERROR_MISSING_CLOSE_SUBEXPRESSION 1
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#define EVAL_ERROR_UNKNOWN_OPERAND 2
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#define EVAL_ERROR_MISSING_OPERAND 3
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#define EVAL_ERROR_MISSING_OPERATOR 4
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#define EVAL_ERROR_REMAINING_GARBAGE 5
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#define EVAL_ERROR_IF_THEN_ELSE_MISSING_ELSE 6
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// evaluation errors
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#define EVAL_ERROR_INVALID_VALUE 101
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#define EVAL_ERROR_INVALID_NUMBER_OF_OPERANDS 102
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#define EVAL_ERROR_VALUE_IS_NAN 103
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#define EVAL_ERROR_VALUE_IS_INFINITE 104
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#define EVAL_ERROR_UNKNOWN_VARIABLE 105
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// parse the given string as an expression and return:
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// a pointer to an expression if it parsed OK
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// NULL in which case the pointer to error has the error code
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extern EVAL_EXPRESSION *expression_parse(const char *string, const char **failed_at, int *error);
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// free all resources allocated for an expression
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extern void expression_free(EVAL_EXPRESSION *expression);
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// convert an error code to a message
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extern const char *expression_strerror(int error);
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// evaluate an expression and return
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// 1 = OK, the result is in: expression->result
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// 2 = FAILED, the error message is in: buffer_tostring(expression->error_msg)
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extern int expression_evaluate(EVAL_EXPRESSION *expression);
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extern int health_variable_lookup(STRING *variable, struct rrdcalc *rc, NETDATA_DOUBLE *result);
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#endif //NETDATA_EVAL_H
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