Thank you Steven.
I am a little bewildered by the new mod configuration. Will it compile If
I download the source file from the new github source to src directory
without further setting up a mod in the old fashioned way? I am using
go1.15.
And today I ran a test logging all the sendings to Redis and readings from
Redis. It is fine - nothing went wrong. But AnotherRedisDesktopManager
still shows the same string format - which I guess is due to it is 32bit
and fail to transfer a long decimal to float32.
So nothing is wrong in golang or its open-source package.
On Tue, Apr 12, 2022 at 9:56 PM Steven Hartland <ste...@multiplay.co.uk>
wrote:
> First off, the package you're using for redis isn't maintained; you should
> switch to github.com/gomodule/redigo/redis instead, which will allow you
> to remove the c == nil check as that doesn't happen.
>
> In your example you're ignoring error from json.Marshal which could be
> hiding a problem, so I would recommend you handle that.
>
> encoding/json should represent float as a json number so I would never
> expect what you're seeing but its not clear to me if that is down to how
> you are viewing it.
>
> On Tue, 12 Apr 2022 at 04:02, Zhaoxun Yan <yan.zhao...@gmail.com> wrote:
>
>> The scenario is upon receiving an incoming financial quotation, save it
>> as a string of json into a Redis service. Sorry but I cannot provide the
>> whole code of quotation receiving here, which is very complex with cgo. But
>> the code below will help you get a glimpse on what should be going on:
>>
>> import (
>> "encoding/json"
>> //"errors"
>> "fmt"
>> "time"
>>
>> "github.com/garyburd/redigo/redis"
>> )
>>
>> var pool *redis.Pool
>>
>> type Fvprices struct {
>> P float64 `json:"price"`
>> F float64 `json:"floor"`
>> C float64 `json:"ceiling"`
>> S float64 `json:"settle"`
>> T int64 `json:"time"`
>> }
>>
>> func init() {
>> pool = newPool()
>> }
>>
>> var redisport = "6379"
>> var redisip = "127.0.0.1"
>> var password = ""
>>
>> func newPool() *redis.Pool {
>>
>> fmt.Println("redis @", redisport, redisip, password)
>> return &redis.Pool{
>> MaxIdle: 4,
>> MaxActive: 50, // max number of connections
>> IdleTimeout: 30 * time.Second,
>>
>> Dial: func() (redis.Conn, error) {
>> c, err := redis.DialURL("redis://" + redisip + ":" +
>> redisport)
>> if err != nil {
>> ErrMsg = fmt.Sprintf("redis connection error: %s", err.
>> Error())
>> fmt.Println(time.Now().Format("2006-01-02 15:04:05"),
>> ErrMsg)
>> return nil, err
>> }
>> if _, autherr := c.Do("AUTH", password); autherr != nil {
>> ErrMsg = fmt.Sprintf("redis password error: %s", err.
>> Error())
>> fmt.Println(time.Now().Format("2006-01-02 15:04:05"),
>> ErrMsg)
>> return nil, autherr
>> }
>> return c, nil
>> },
>> }
>> }
>>
>> func Upfutureprice(future_id string,
>> future_price, lowerLimitPrice, upperLimitPrice, preSettlementPrice
>> float64,
>> updatetime time.Time) {
>>
>> c := pool.Get()
>> if c == nil {
>> return
>> }
>> defer c.Close()
>>
>> content := Fvprices{
>> P: future_price,
>> F: lowerLimitPrice,
>> C: upperLimitPrice,
>> S: preSettlementPrice,
>> T: updatetime.UnixNano() / 1e6,
>> }
>>
>> js, _ := json.Marshal(content)
>>
>> if _, err := c.Do("SET", future_id, js); err != nil {
>> fmt.Println("cannot save to redis：", err)
>> }
>> }
>>
>> So obviously until the function "Upfutureprice" everything is correct,
>> for all four prices it receives are in float64 format. After running this
>> program for one day, I just browse the redis using
>> AnotherRedisDesktopManager via ssh port forwarding, and something strange
>> happens as I clicking on various future_id key strings:
>>
>> {
>> price:807
>> floor:720.6
>> ceiling:881
>> settle:"800.8000000000001"
>> time:1649726499000
>> }
>>
>> {
>> price:"3691.0000000000005"
>> floor:3237
>> ceiling:4204
>> settle:3721
>> time:1649726910500
>> }
>>
>> {
>> price:"15405.000000000004"
>> floor:13625
>> ceiling:17340
>> settle:15485
>> time:1649728303500
>> }
>>
>> {
>> price:"800.4000000000001"
>> floor:720.6
>> ceiling:881
>> settle:"800.8000000000001"
>> time:1649728048000
>> }
>>
>> Note quotations above. I wonder how encoding/json can made transformation
>> from a float64 inside struct Fvprices to a string instead? It seems
>> that only long decimals would trigger such an error while short decimals
>> won't:
>>
>> {
>> price:2910
>> floor:2443.5
>> ceiling:3305.5
>> settle:2874.5
>> time:1649728261026
>> }
>>
>> How could that happen? I am really puzzled.
>>
>> Regards,
>> Zhaoxun
>>
>> --
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>>
>
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