C语言操作yaml配置文件通用操作工具

Posted 2023-04-23

参考技术A 在go语言中使用viper之类的库很方便的处理yaml配置文件，但是在c语言中就比较麻烦，经过一番思索和借助强大的github,发现了一个libyaml c库，但是网上的例子都比较麻烦，而且比较繁琐，就想法作了一个相对比较容易配置的解析应用，可以简单地类似viper 的模式进行配置实现不同的配置文件读取。如你的配置文件很复杂请按格式修改KeyValue 全局变量，欢迎大家一起完善

库请自行下载 GitHub - yaml/libyaml: Canonical source repository for LibYAML

直接上代码

yaml示例文件

%YAML 1.1

---

mqtt:

subtopic: "Control/#"

pubtopic: "bbt"

qos: 1

serveraddress: "tcp://192.168.0.25:1883"

clientid: "kvm_test"

writelog: false

writetodisk: false

outputfile: "./receivedMessages.txt"

hearttime: 30

#ifndef __CONFIG_H__

#define __CONFIG_H__

#ifdef __cplusplus

extern "C"

#endif

/************************/

/* Minimum YAML version */

/************************/

#define YAML_VERSION_MAJOR 1

#define YAML_VERSION_MINOR 1

#define STRUCT_TYPE_NAME 100

#define INT_TYPE_NAME 101

#define STRING_TYPE_NAME 102

#define BOOL_TYPE_NAME 103

#define FLOAT_TYPE_NAME 104

#define MAP_TYPE_NAME 105

#define LIST_TYPE_NAME 106

typedef struct

char *key;

void *value;

int valuetype;

char *parent;

KeyValue,*pKeyValue;

#ifdef __cplusplus



#endif

#endif

#include

#include

#include

#include

#include

#include

#include

#include "config.h"

typedef struct

char *SUBTOPIC; //string `yaml:"subtopic" mapstructure:"subtopic"` //"topic1"

char *PUBTOPIC; //string `yaml:"pubtopic" mapstructure:"pubtopic"`

int QOS; //byte `yaml:"qos" mapstructure:"qos"` //1

char *SERVERADDRESS; //string `yaml:"serveraddress" mapstructure:"serveraddress"` //= "tcp://mosquitto:1883"

char *CLIENTID; //string `yaml:"clientid" mapstructure:"clientid"` //= "mqtt_subscriber"

int HEARTTIME; //int `yaml:"hearttime" mapstructure:"hearttime"`

// CommandLocalPath string `yam:"commanlocalpath"`

mqttSection,*pmqttSection;

typedef struct

mqttSection Mqtt;// `yaml:"mqtt" mapstructure:"mqtt"`

// KVM kvmSection `yaml:"kvm" mapstructure:"kvm"`

ConfigT;

ConfigT config;

static KeyValue webrtcconfig[]=

"mqtt",&config,STRUCT_TYPE_NAME,NULL,

"subtopic",&(config.Mqtt.SUBTOPIC),STRING_TYPE_NAME,"mqtt",

"pubtopic",&(config.Mqtt.PUBTOPIC),STRING_TYPE_NAME,"mqtt",

"qos",&(config.Mqtt.QOS),INT_TYPE_NAME,"mqtt",

"serveraddress",&(config.Mqtt.SERVERADDRESS),STRING_TYPE_NAME,"mqtt",

"clientid",&(config.Mqtt.CLIENTID),STRING_TYPE_NAME,"mqtt",

"hearttime",&(config.Mqtt.HEARTTIME),INT_TYPE_NAME,"mqtt",

NULL,NULL,0,NULL,

;

int printConfig(ConfigT * pconfig)

if(pconfig==NULL) return -1;

printf("mqtt:r ");

if(pconfig->Mqtt.SUBTOPIC!=NULL) printf("subtopic: %sr ",pconfig->Mqtt.SUBTOPIC);

if(pconfig->Mqtt.SUBTOPIC!=NULL) printf("pubtopic: %sr ",pconfig->Mqtt.PUBTOPIC);

printf("qos: %dr ",config.Mqtt.QOS);

if(pconfig->Mqtt.SERVERADDRESS!=NULL) printf("serveraddress: %sr ",pconfig->Mqtt.SERVERADDRESS);

if(pconfig->Mqtt.CLIENTID!=NULL) printf("clientid: %sr ",pconfig->Mqtt.CLIENTID);

printf("hearttime: %dr ",config.Mqtt.HEARTTIME);



int freeConfig(ConfigT * pconfig)

if(pconfig==NULL) return -1;

if(pconfig->Mqtt.SERVERADDRESS!=NULL) free(pconfig->Mqtt.SERVERADDRESS);

if(pconfig->Mqtt.CLIENTID!=NULL) free(pconfig->Mqtt.CLIENTID);

if(pconfig->Mqtt.SUBTOPIC!=NULL) free(pconfig->Mqtt.SUBTOPIC);



char currentkey[100];

void getvalue(yaml_event_t event,pKeyValue *ppconfigs)

char *value = (char *)event.data.scalar.value;

pKeyValue pconfig=*ppconfigs;

char *pstringname;

while(pconfig->key!=NULL)

if(currentkey[0]!=0)

if(!strcmp(currentkey,pconfig->key))



switch(pconfig->valuetype)

case STRING_TYPE_NAME:

pstringname=strdup(value);

printf("get string value %sr ",pstringname);

*((char**)pconfig->value)=pstringname;

memset(currentkey, 0, sizeof(currentkey));

break;

case INT_TYPE_NAME:

*((int*)(pconfig->value))=atoi(value);

memset(currentkey, 0, sizeof(currentkey));

break;

case BOOL_TYPE_NAME:

if(!strcmp(value,"true")) *((bool*)(pconfig->value))=true;

else *((bool*)(pconfig->value))=false;

memset(currentkey, 0, sizeof(currentkey));

break;

case FLOAT_TYPE_NAME:

*((float*)(pconfig->value))=atof(value);

memset(currentkey, 0, sizeof(currentkey));

break;

case STRUCT_TYPE_NAME:

case MAP_TYPE_NAME:

case LIST_TYPE_NAME:

memset(currentkey, 0, sizeof(currentkey));

strncpy(currentkey,value,strlen(value));

break;

default:

break;



break;



//continue;

else

if(!strcmp(value,pconfig->key))

strncpy(currentkey,pconfig->key,strlen(pconfig->key));

break;





pconfig++;





int Load_YAML_Config( char *yaml_file, KeyValue *(configs[]) )



struct stat filecheck;

yaml_parser_t parser;

yaml_event_t event;

bool done = 0;

unsigned char type = 0;

unsigned char sub_type = 0;

if (stat(yaml_file, &filecheck) != false )



printf("[%s, line %d] Cannot open configuration file '%s'! %s", __FILE__, __LINE__, yaml_file, strerror(errno) );

return -1;



FILE *fh = fopen(yaml_file, "r");

if (!yaml_parser_initialize(&parser))



printf("[%s, line %d] Failed to initialize the libyaml parser. Abort!", __FILE__, __LINE__);

return -1;



if (fh == NULL)



printf("[%s, line %d] Failed to open the configuration file '%s' Abort!", __FILE__, __LINE__, yaml_file);

return -1;



memset(currentkey, 0, sizeof(currentkey));

/* Set input file */

yaml_parser_set_input_file(&parser, fh);

while(!done)



if (!yaml_parser_parse(&parser, &event))



/* Useful YAML vars: parser.context_mark.line+1, parser.context_mark.column+1, parser.problem, parser.problem_mark.line+1, parser.problem_mark.column+1 */

printf( "[%s, line %d] libyam parse error at line %ld in '%s'", __FILE__, __LINE__, parser.problem_mark.line+1, yaml_file);



if ( event.type == YAML_DOCUMENT_START_EVENT )



//yaml file first line is version

//%YAML 1.1

//---

yaml_version_directive_t *ver = event.data.document_start.version_directive;

if ( ver == NULL )



printf( "[%s, line %d] Invalid configuration file. Configuration must start with "%%YAML 1.1"", __FILE__, __LINE__);



int major = ver->major;

int minor = ver->minor;

if (! (major == YAML_VERSION_MAJOR && minor == YAML_VERSION_MINOR) )



printf( "[%s, line %d] Configuration has a invalid YAML version. Must be 1.1 or above", __FILE__, __LINE__);

return -1;





else if ( event.type == YAML_STREAM_END_EVENT )



done = true;



else if ( event.type == YAML_MAPPING_END_EVENT )



sub_type = 0;



else if ( event.type == YAML_SCALAR_EVENT )



getvalue(event,configs);





return 0;



int main(int argc, char *argv[])

pKeyValue pconfig=&webrtcconfig[0];

Load_YAML_Config("../../etc/kvmagent.yml",&pconfig);

printConfig(&config);

freeConfig(&config);

YAML概述

目录

• 一.YAML概述
• 二.YAML文件示例详解
• • 1.deployment.yaml文件详解
  • 2.Pod yaml文件详解
  • 3.Service yaml文件详解
• 三.YAML文件相关操作

一.YAML概述

Kubernetes支持 YAML和JSON格式管理资源对象JSON格式:主要用于api接口之间消息的传递。
YAML格式:用于配置和管理，YAM是一种简洁的非标记性语言，内容格式人性化，较易读。

YAML语法格式:
●大小写敏感
●使用缩进表示层级关系
●不支持Tab键制表符缩进,只使用空格缩进
●缩进的空格数目不重要,只要相同层级的元素左侧对齐即可,通常开头缩进两个空格
●符号字符后缩进一个空格，如冒号，逗号，短横杆（-）等
●"- - - ”表示YAML格式，一个文件的开始,用于分隔文件间
●"#”表示注释

//查看api 资