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
>
> --
> You received this message because you are subscribed to the Google Groups
> "golang-nuts" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to golang-nuts+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/golang-nuts/f42b29b3-de17-48c6-9f71-1176f1288396n%40googlegroups.com
> <https://groups.google.com/d/msgid/golang-nuts/f42b29b3-de17-48c6-9f71-1176f1288396n%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/golang-nuts/CAHEMsqb24d5B4NxzeaCNdR%2B_%3DQgxbyGJSsSgjS8jyQa%3DQFHmgg%40mail.gmail.com.
