问题

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我有一个每秒将JSON记录写入stdout的进程，如何使用jq在写入一定数量（=x）的记录后触发操作并仍然每秒输出？

为了允许简单的重播，该进程被替换为一个带有sleep的bash shell读取循环：
`( read line ; while [[ -n "${line}" ]] ; do echo "${line}"; sleep 1 ; read line ; done ) < json.data`

x条记录后的操作是计算记录的数量，并忽略包含“null”值的行。

当x为1时，处理每行的解决方案是简单或直接的。

( read line ; while [[ -n "${line}" ]] ; do echo "${line}"; sleep 1 ; read line ; done ) < json.data |
jq -c '. , ([.] | del( .[] | select(to_entries[].value == null)) | length)'
{"date":230415072207,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
1
{"date":230415072311,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
1
{"date":230415072312,"kwL1Tl":null,"kwL1":null,"kwL2Tl":null,"kwL2":null,"kwL3Tl":null,"kwL3":null}
0
{"date":230415072415,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
1
{"date":230415072416,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
1
...

但是当我想为每5或100个记录执行此操作时该怎么办？

x=5的预期输出如下：
```shell
$ ( read line ; while [[ -n "${line}" ]] ; do echo "${line}"; sleep 1 ; read line ; done ) < json.data | \
alert
{"date":230415072207,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
{"date":230415072311,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
{"date":230415072312,"kwL1Tl":null,"kwL1":null,"kwL2Tl":null,"kwL2":null,"kwL3Tl":null,"kwL3":null}
{"date":230415072415,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
{"date":230415072416,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
4
{"date":230415072519,"kwL1Tl":0,"kwL1":0.021,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
{"date":230415072520,"kwL1Tl":0,"kwL1":0.021,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
{"date":230415072623,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
{"date":230415072624,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
{"date":230415072727,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.076,"kwL3Tl":0,"kwL3":0}
5
{"date":230415072728,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.076,"kwL3Tl":0,"kwL3":0}
{"date":230415072831,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
...

Bash函数 "alert" 应包含一个有效的jq命令。

<details>
<summary>英文:</summary>

So I have a process that writes a JSON record to stdout every second, how can I use jq to trigger an action after a certain amount (=x) of records are written and still have my output every second? 

The process is, to allow easy replay, replaced by a bash shell read loop with a sleep:  
`( read line ; while [[ -n &quot;${line}&quot; ]] ; do echo &quot;${line}&quot;; sleep 1 ; read line ; done ) &lt; json.data`

The action after x records is to count the amount of records, and ignore lines with &quot;null&quot; values.

When x is 1, so process each line, the solution is simple or straightforward.  

( read line ; while [[ -n "${line}" ]] ; do echo "${line}"; sleep 1 ; read line ; done ) < json.data |
jq -c '. , ([.] | del( .[] | select(to_entries[].value == null)) | length)'
{"date":230415072207,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
1
{"date":230415072311,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
1
{"date":230415072312,"kwL1Tl":null,"kwL1":null,"kwL2Tl":null,"kwL2":null,"kwL3Tl":null,"kwL3":null}
0
{"date":230415072415,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
1
{"date":230415072416,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
1
...

But what to do when I want to do this for every 5 or 100 records ?

The expected output for x=5:  

$ ( read line ; while [[ -n "${line}" ]] ; do echo "${line}"; sleep 1 ; read line ; done ) < json.data |
alert
{"date":230415072207,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
{"date":230415072311,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
{"date":230415072312,"kwL1Tl":null,"kwL1":null,"kwL2Tl":null,"kwL2":null,"kwL3Tl":null,"kwL3":null}
{"date":230415072415,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
{"date":230415072416,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
4
{"date":230415072519,"kwL1Tl":0,"kwL1":0.021,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
{"date":230415072520,"kwL1Tl":0,"kwL1":0.021,"kwL2Tl":0,"kwL2":0.08,"kwL3Tl":0,"kwL3":0}
{"date":230415072623,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
{"date":230415072624,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
{"date":230415072727,"kwL1Tl":0,"kwL1":0.022,"kwL2Tl":0,"kwL2":0.076,"kwL3Tl":0,"kwL3":0}
5
{"date":230415072728,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.076,"kwL3Tl":0,"kwL3":0}
{"date":230415072831,"kwL1Tl":0,"kwL1":0.023,"kwL2Tl":0,"kwL2":0.075,"kwL3Tl":0,"kwL3":0}
...

Bash function "alert" should contain a working jq command.

</details>


# 答案1
**得分**: 0

以下“alert”函数执行预期操作：

```javascript
alert(){
    #
    # 如有需要发送警报
    jq -nc --argjson m "5" '
        def alerts(r): r | del( .[] | select(to_entries[].value == null)) | length ; 
        foreach inputs as $in (
             {"recs":[]};
             if (.recs|length) < $m then .recs += [$in] else .recs=[$in] end;
             .recs[-1], if (.recs|length) == $m then alerts(.recs) else empty end)
    '
}

解释一下：

• “foreach inputs”读取处理输出作为流
• 第一个“if”将输入JSON记录添加到数组“recs”中，直到数组达到$m大小。（在我们的例子中，“5”由jq程序的“-argjson m 5”选项指定）。如果大小为5，则再次覆盖“recs”数组（用新的第一个元素）。
• “.recs[-1]”将最后接收到的记录放在输出上。（“$in”也能正常工作）
• 第二个“if”在数组“recs”大小为5时执行内部函数“alerts”。
• jq本地函数“alerts”在删除具有一个或多个字段的“null”值的记录后，输出数组“recs”的大小。

alert(){
    #
    # send alerts if needed
    jq -nc --argjson m "5" '
        def alerts(r): r | del( .[] | select(to_entries[].value == null)) | length ; 
        foreach inputs as $in (
             {"recs":[]};
             if (.recs|length) < $m then .recs += [$in] else .recs=[$in] end;
             .recs[-1], if (.recs|length) == $m then alerts(.recs) else empty end)
    '
}