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关于 Unmarshal yaml into struct 的错误

来源：stackoverflow
2024-04-22 14:30:37
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大家好，今天本人给大家带来文章《关于 Unmarshal yaml into struct 的错误》，文中内容主要涉及到，如果你对Golang方面的知识点感兴趣，那就请各位朋友继续看下去吧~希望能真正帮到你们，谢谢！

问题内容

我想解组一个 []byte 变量 int struct prometheusyml。以下是 promethuesyml 和 []byte 变量的定义。

type prometheusyml struct {
        global        global          `yaml:"global,omitempty"`
        scrapeconfigs []scrapeconfigs `yaml:"scrape_configs,omitempty"`
}

type global struct {
        scrapeinterval     string `yaml:"scrape_interval,omitempty"`
        evaluationinterval string `yaml:"evaluation_interval,omitempty"`
}

type scrapeconfigs struct {
        jobnmaes        string            `yaml:"job_name,omitempty"`
        relabelconfigs  []relabelconfigs  `yaml:"relabel_configs,omitempty"`
        metricspath     string            `yaml:"metrics_path,omitempty"`
        scheme          string            `yaml:"scheme,omitempty"`
        consulsdconfigs []consulsdconfigs `yaml:"consul_sd_configs,omitempty"`
}

type relabelconfigs struct {
        sourcelabels string `yaml:"source_labels,omitempty"`
        action       string `yaml:"action,omitempty"`
        regex        string `yaml:"regex,omitempty"`
        replacement  string `yaml:"replacement,omitempty"`
        targetlabel  string `yaml:"target_label,omitempty"`
}

type consulsdconfigs struct {
        server   string   `yaml:"server,omitempty"`
        services []string `yaml:"services,omitempty"`
}

# my global config
global:
  scrape_interval:     15s # set the scrape interval to every 15 seconds. default is every 1 minute.
  evaluation_interval: 15s # evaluate rules every 15 seconds. the default is every 1 minute.
  # scrape_timeout is set to the global default (10s).


scrape_configs:
  - job_name: 'consul'
    relabel_configs:
        - source_labels:  ["__meta_consul_service"]
          action: replace
          regex: "(.*)"
          replacement: '${1}'
          target_label: "service"
        - source_labels: ["__meta_consul_tags"]
          action: replace
          regex: ',(?:[^,]+,){0}([^=]+)=([^,]+),.*'
          replacement: '${2}'
          target_label: '${1}'
        - source_labels: ["__meta_consul_tags"]
          action: replace
          regex: ',(?:[^,]+,){1}([^=]+)=([^,]+),.*'
          replacement: '${2}'
          target_label: '${1}'
        - source_labels: ["__meta_consul_tags"]
          action: replace
          regex: ',(?:[^,]+,){2}([^=]+)=([^,]+),.*'
          replacement: '${2}'
          target_label: '${1}'
    metrics_path: /metrics
    scheme: http
    consul_sd_configs:
        - server: 192.168.0.101:8500
          services:
              - cfs

但是当我运行该程序时。它显示了错误，这意味着无法将 source_labels 解组到结构中。很可能 [“__meta_consul_tags”] 无法翻译成字符串！！！！但我应该怎么做才能修复这个错误呢？实际类型是什么？

line 11: cannot unmarshal !!seq into string

解决方案

relabel_configs中的source_labels显然是string的数组。因此，您必须将 sourcelabels 的 数据类型 从 string 替换为 []string。那么你就可以开始了。

type relabelConfigs struct {
    SourceLabels []string `yaml:"source_labels,omitempty"`
    Action       string   `yaml:"action,omitempty"`
    Regex        string   `yaml:"regex,omitempty"`
    Replacement  string   `yaml:"replacement,omitempty"`
    TargetLabel  string   `yaml:"target_label,omitempty"`
}

只需更改此即可解决您的问题。

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