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The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Go: Google's Plan9 refugees are staging a breakout
 
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Da Mott Man
Aug 3, 2012

Methanar posted:

I want to marshal json into a struct. Given the following json, I've come up with the following struct. But the keys set for tags could actually be anything, not restricted to name or aggregatedBy. How do I represent this in my struct?

code:
[
  {
    "target": "sumSeries(https_metric.*)",
    "tags": {
      "name": "sumSeries(https_metric.*)",
      "aggregatedBy": "sum"
    },
    "datapoints": [
      [
         null,
        1630946310
      ],
      [
        10,
        1630946320
      ]
    ]
  }
]
code:
type graphiteResults []struct {
	Target string `json:"target"`
	Tags   struct {
		Name         string `json:"name"`
		AggregatedBy string `json:"aggregatedBy"`
	} `json:"tags"`
	Datapoints [][]interface{} `json:"datapoints"`
}

This will handle arbitrary json fields if you marshal the extra data in tags to that member.

Go code:
type graphiteResults []struct {
	Target string `json:"target"`
	Tags   struct {
		Name         string `json:"name"`
		AggregatedBy string `json:"aggregatedBy"`
                Extra map[string]interface{} `json:"-"`
	} `json:"tags"`
	Datapoints [][]interface{} `json:"datapoints"`
}

* # ¿ Sep 6, 2021 18:41
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# ¿ May 11, 2024 23:37
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Da Mott Man
Aug 3, 2012

Methanar posted:

So the existence of tags at all is optional. But if it does exist, it's a map of strings with values of also strings.

code:
type graphiteResults[]struct {
	Target string `json:"target"`
	Tags   map[string]interface{} `json:"tags"`
	Datapoints [][]interface{} `json:"datapoints"`
}

Yeah that should work.

Edit:
Actually I think using anonymous structs would work better if Tags is omitted, the other way if Tags always exists but can be empty.

Go code:
type graphiteResults []struct {
	Target     string          `json:"target"`
	Datapoints [][]interface{} `json:"datapoints"`
}

type OptionalTags graphiteResults

func (results graphiteResults) MarshalJSON() ([]byte, error) {
	return json.Marshal(struct {
		OptionalTags
		Tags map[string]interface{}
	}{
		OptionalTags: OptionalTags(results),
		Tags:         map[string]interface{}{"Name": "testing"},
	})
}

Da Mott Man fucked around with this message at 19:19 on Sep 6, 2021

* # ¿ Sep 6, 2021 19:02
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The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Go: Google's Plan9 refugees are staging a breakout