go - 无法使用Go with BurntSushi库读取TOML文件

我正在使用BurntSushi库在GO应用程序中加载TOML配置文件。我已经按照库中的说明编写了结构和配置toml文件本身。我遇到了一些麻烦，似乎无法找到问题的根源。

详细信息如下:

结构:

package main


//ConfigurationParameters provides the struct to hold configuration parameters from config file
type ConfigurationParameters struct {
    Title string
    //serviceDiscovery captures configuration parameters needed for service discovery registration with Consul
    ServiceDiscovery ConsulConf `toml:"ServiceDiscovery"`
    //metadataReporting captures which metadata to be registered with service into consul for use during discovery
    MetadataReporting MetaDataConf `toml:"MetadataReporting"`
    //awsTagsToLabels captures the aws tags that should be added to reported metrics as Labels
    AwsTagsToLabels LabelConf `toml:"AwsTagsToLabels"`
    //collectors captures the list of collectors to use
    Collectors CollectorConf `toml:"Collectors"`
    //service captures agent related configurations
    Service ServiceConf `toml:"Service"`
}

//ConsulConf captures configuration parameters needed for service discovery registration with Consul
type ConsulConf struct {
    enabled    bool
    endpoint   string
    port       int
    datacenter string
    serviceID  string
}
//MetaDataConf captures which metadata to be registered with service into consul for use during discovery
    type MetaDataConf struct {
        enabled   bool
        awsregion string
    }
//LabelConf captures the aws tags that should be added to reported metrics as Labels
type LabelConf struct {
    enabled       bool
    refreshPeriod int
}

//CollectorConf captures the list of collectors to use
type CollectorConf struct {
    goCollectionEnabled       bool
    exporterCollectionEnabled bool
    wmiCollectionEnabled      bool
    agentCollectionEnabled    bool
    enabledCollectors         string
    metricMap                 []MetricMap
}

//MetricMap captures a mapping between one or more WMI metrics and the name it should be reported with
type MetricMap struct {
    wmiMetricName  []string
    exportName     string
    dropMetric     bool
    computedMetric bool
    computeLogic   string
}

//ServiceConf captures agent related configurations
type ServiceConf struct {
    listenIP           string
    listenPort         int
    metricPath         string
    collectionInterval int
    serviceName        string
}

和配置toml文件:

Title = "WMI Exporter Configuration"

[ServiceDiscovery]
    enabled = true
    endpoint = "my.consul.server"
    port = 5500
    datacenter = "ucm-west"
    serviceID = "ucm.agent.wmiExporter"

[MetadataReporting]
    enabled = true
    awsregion = "us-west-2"

[AwsTagsToLabels]
    enabled = true
    refreshPeriod = 3600

[Collectors]
    goCollectionEnabled = true
    exporterCollectionEnabled = true
    wmiCollectionEnabled = true
    agentCollectionEnabled = false
    enabledCollectors   = "cpu,os"
    [Collectors.MetricMap.0]
        wmiMetricName = ["test"]
        exportName = "export_test"

[Service]
    listenPort =  9103
    metricPath = "/metrics"
    collectionInterval = 60
    serviceName = "wmi_exporter"

以及读取配置文件的代码:

// InitializeFromConfig reads configuration parameters from configuration file and initializes this service
func InitializeFromConfig(configfile string) ConfigurationParameters {
    conf := ConfigurationParameters{}

    if configfile == "" {
        return conf
    }

    _, err := toml.DecodeFile(configfile, &conf)
    if err != nil {
        log.Fatalf("Cannot parse configuration file at %s. Error=%s", configfile, err)
    }
    //at this point, conf is a fully loaded configuration now; now initialize everything from conf
    return conf
}

我面临的问题是，只有Title属性的值被映射到GO结构成员中。所有其他配置保持未映射状态。查看github上所有BurntSushi和(Go) How to use toml files?的示例，我看不出与当前在代码中所做的任何区别。

我还使用了BurntSushi包中的tomlv验证器来查看TOML文件中的类型，我相信它们看起来是正确的。

数据类型:

Title                                             String
ServiceDiscovery                                  Hash
    ServiceDiscovery.enabled                      Bool
    ServiceDiscovery.endpoint                     String
    ServiceDiscovery.port                         Integer
    ServiceDiscovery.datacenter                   String
    ServiceDiscovery.serviceID                    String
MetadataReporting                                 Hash
    MetadataReporting.enabled                     Bool
    MetadataReporting.awsregion                   String
AwsTagsToLabels                                   Hash
    AwsTagsToLabels.enabled                       Bool
    AwsTagsToLabels.refreshPeriod                 Integer
Collectors                                        Hash
    Collectors.goCollectionEnabled                Bool
    Collectors.exporterCollectionEnabled          Bool
    Collectors.wmiCollectionEnabled               Bool
    Collectors.agentCollectionEnabled             Bool
    Collectors.enabledCollectors                  String
        Collectors.MetricMap.0                    Hash
            Collectors.MetricMap.0.wmiMetricName  Array
            Collectors.MetricMap.0.exportName     String
Service                                           Hash
    Service.listenPort                            Integer
    Service.metricPath                            String
    Service.collectionInterval                    Integer
    Service.serviceName                           String

我尝试调试BurntSushi程序包代码，但是它不是很有帮助(Delve调试器无法显示该程序包中的某些变量，并且似乎在该程序包中的各行之间随机跳转)。

对我可能做错的任何帮助或指示吗？

谢谢。

最佳答案

您需要导出要BurntSushi/toml解码的所有字段，包括子字段:

//ConfigurationParameters provides the struct to hold configuration parameters from config file
type ConfigurationParameters struct {
    Title string
    //serviceDiscovery captures configuration parameters needed for service discovery registration with Consul
    ServiceDiscovery ConsulConf `toml:"ServiceDiscovery"`
    //metadataReporting captures which metadata to be registered with service into consul for use during discovery
    MetadataReporting MetaDataConf `toml:"MetadataReporting"`
    //awsTagsToLabels captures the aws tags that should be added to reported metrics as Labels
    AwsTagsToLabels LabelConf `toml:"AwsTagsToLabels"`
    //collectors captures the list of collectors to use
    Collectors CollectorConf `toml:"Collectors"`
    //service captures agent related configurations
    Service ServiceConf `toml:"Service"`
}

//ConsulConf captures configuration parameters needed for service discovery registration with Consul
type ConsulConf struct {
    Enabled    bool
    Endpoint   string
    Port       int
    Datacenter string
    ServiceID  string
}

//MetaDataConf captures which metadata to be registered with service into consul for use during discovery
type MetaDataConf struct {
    Enabled   bool
    Awsregion string
}

//LabelConf captures the aws tags that should be added to reported metrics as Labels
type LabelConf struct {
    Enabled       bool
    RefreshPeriod int
}

//CollectorConf captures the list of collectors to use
type CollectorConf struct {
    GoCollectionEnabled       bool
    ExporterCollectionEnabled bool
    WmiCollectionEnabled      bool
    AgentCollectionEnabled    bool
    EnabledCollectors         string
    MetricMap                 []MetricMap
}

//MetricMap captures a mapping between one or more WMI metrics and the name it should be reported with
type MetricMap struct {
    WmiMetricName  []string
    ExportName     string
    DropMetric     bool
    ComputedMetric bool
    ComputeLogic   string
}

//ServiceConf captures agent related configurations
type ServiceConf struct {
    ListenIP           string
    ListenPort         int
    MetricPath         string
    CollectionInterval int
    ServiceName        string
}

另外我不确定此Collectors.MetricMap.0语法应该代表什么，但无法将toml值编码到[]MetricMap字段中
您要做的是这样的:

[[Collectors.MetricMap]]
    wmiMetricName = ["test"]
    exportName = "export_test"

关于go - 无法使用Go with BurntSushi库读取TOML文件，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/43218484/