我有以下向 Elasticsearch 发出请求的代码:

// Prepare request
tr := &http.Transport{
    TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{Transport: tr}
req, err := http.NewRequest("GET", url, nil)
req.Header.Add("Authorization", ES_AUTH)

// Make request
resp, err := client.Do(req)
if err != nil {
    log.Fatal(err)
}
defer resp.Body.Close()

d := json.NewDecoder(resp.Body)
d.UseNumber()

var x interface{}
if err = d.Decode(&x); err != nil {
    log.Fatal(err)
}

fmt.Printf("decoded to %#v\n", x)

输出是这样的:

decoded to map[string]interface {}{"took":"2", "timed_out":false, "_shards":map[string]interface {}{"total":"1", "successful":"1", "failed":"0"}, "hits":map[string]interface {}{"total":"15", "max_score":"1.0", "hits":[]interface {}{map[string]interface {}{"_index":"reports2", "_type":"insiders", "_id":"cbaf7513-0046-4929-a740-afe13d6616b4", "_score":"1.0", "_routing":"524364278561685819", "_source":map[string]interface {}{"insider_mean":"420.7546961325966",  "friend_total":"3.7859686E7", "sum_of_followers":"3.531951269E10", "follower_total":"50000.0"}}}}}

我正在尝试使用 d.UseNumber() 使输出尽可能具有整数，而不是对所有内容都使用 float 。我期望 "friend_total"、"sum_of_followers" 和 "follower_total" 具有整数样式的值。

如果我向 postman 发出相同的请求，您会看到这些值应该是整数:

{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 1,
    "successful": 1,
    "failed": 0
  },
  "hits": {
    "total": 15,
    "max_score": 1,
    "hits": [
      {
        "_index": "reports2",
        "_type": "insiders",
        "_id": "cbaf7513-0046-4929-a740-afe13d6616b4",
        "_score": 1,
        "_routing": "524364278561685819",
        "_source": {
          "insider_mean": 420.7546961325966,
          "sum_of_followers": 35319512690,
          "follower_total": 50000,
          "friend_total": 37859686
        }
      }
    ]
  }
}

我无法复制 this Go Playground 中的错误所以我认为错误可能是因为请求本身，而不是解码。

编辑:

我发现执行 curl 请求会返回有效载荷，所以现在我确定解码不是问题。

curl localhost:9200/524364278561685819/insiders/_search\?size\=1                   
{"took":2,"timed_out":false,"_shards":{"total":1,"successful":1,"failed":0},"hits":{"total":15,"max_score":1.0,"hits":[{"_index":"reports2","_type":"insiders","_id":"cbaf7513-0046-4929-a740-afe13d6616b4","_score":1.0,"_routing":"524364278561685819","_source":{"insider_mean":420.7546961325966,"sum_of_followers":3.531951269E10,"follower_total":50000.0,"friend_total":3.7859686E7}}]}}

最佳答案

正如 curl 输出所示，Elasticsearch 实际上以浮点格式给出结果。看来 Postman 和 jq 为你做了转换，所以我现在的解决方案是只对 jq 进行系统调用:

// Make request
resp, err := client.Do(req)
if err != nil {
    log.Fatal(err)
}
defer resp.Body.Close()

// Use jq to convert the floating point stuff to Longs / Ints
cmd := exec.Command("jq", ".")
cmd.Stdin = resp.Body
var out bytes.Buffer
cmd.Stdout = &out
err = cmd.Run()
if err != nil {
    log.Fatal(err)
}

// Decode the output from jq
d := json.NewDecoder(bytes.NewReader(out.Bytes())
d.UseNumber()

var x interface{}
if err = d.Decode(&x); err != nil {
    log.Fatal(err)
}

fmt.Printf("decoded to %#v\n", x)

澄清 Postman/curl:

(They) are simply using a different format for the float. there is no such thing as an integer in JSON, so 35319512690 is just a float without the decimal point which equivalent to both 35319512690.0 and 3.531951269E10 - JimB

关于go - 使用 UseNumber 解码 GET 请求，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41126762/