关于 Unmarshal yaml into struct 的错误

Question

我想解组一个 []byte 变量 int struct prometheusyml。下面是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: ''
          target_label: "service"
        - source_labels: ["__meta_consul_tags"]
          action: replace
          regex: ',(?:[^,]+,){0}([^=]+)=([^,]+),.*'
          replacement: ''
          target_label: ''
        - source_labels: ["__meta_consul_tags"]
          action: replace
          regex: ',(?:[^,]+,){1}([^=]+)=([^,]+),.*'
          replacement: ''
          target_label: ''
        - source_labels: ["__meta_consul_tags"]
          action: replace
          regex: ',(?:[^,]+,){2}([^=]+)=([^,]+),.*'
          replacement: ''
          target_label: ''
    metrics_path: /metrics
    scheme: http
    consul_sd_configs:
        - server: 192.168.0.101:8500
          services:
              - cfs

但是当我运行程序。它显示了暗示 source_labels 无法解组为结构的错误。很可能 ["__meta_consul_tags"] 不能被 t运行化为字符串！！！！但是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

Answer 1

relabel_configs中的

source_labels显然是string的数组。因此，您必须将 SourceLabels 的 data type 从 string 替换为 []string。那你就可以开始了。

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"`
}

只需更改它即可解决您的问题。

关于 Unmarshal yaml into struct 的错误

A bug about Unmarshal yaml into struct

yaml

go

prometheus