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我正在尝试使用 Go+Gin+PGX 连接到我的 GAE Postgres SQL 数据库。我激活了 Postgres SQL api,这个程序在我的本地机器上运行,但不在 GAE 上运行。我认为它没有通过 pgx 连接数据库,但我不确定。

main.go在我的本地机器和实例上工作,psql但在部署到 GAE 后无法通过 GCP SQL 实例中的公共 IP 连接到 db。我已经修改了我的工作代码来修复 MWE。

package main

import (
    "fmt"
    "os"
    "github.com/gin-gonic/gin"
    "github.com/jackc/pgx/v4"
    "golang.org/x/net/context"
)

func main() {
    conn, err := connectDB()
    if err != nil {
        os.Exit(1)
    }
    defer conn.Close(context.Background())

    router := gin.Default()
    router.GET("/", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "pong",
        })
    })
    router.Run(":8080")
}

func connectDB() (c *pgx.Conn, err error) {
    postgres := "postgresql://postgres:root@35.236.60.144:5432/goapi" //35.236.60.144
    conn, err := pgx.Connect(context.Background(), postgres)
    if err != nil {
        fmt.Fprintf(os.Stderr, "Unable to connect to database:\n\t%v\n", err.Error())
        return nil, err
    }
    err = conn.Ping(context.Background())
    if err != nil {
        fmt.Fprintf(os.Stderr, "Unable to ping:\n\t%v\n", err.Error()) 
        return nil, err
    }
    return conn, err
}

如果我使用 Postman 执行 GET 到 GAE 网站,那么我会得到

<html>

<head>
    <meta http-equiv="content-type" content="text/html;charset=utf-8">
    <title>500 Server Error</title>
</head>

<body text=#000000 bgcolor=#ffffff>
    <h1>Error: Server Error</h1>
    <h2>The server encountered an error and could not complete your request.<p>Please try again in 30 seconds.</h2>
    <h2></h2>
</body>

</html>

相应的 GAE 错误堆栈跟踪示例是

runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0xaabec7]
     at
     github.com/jackc/pgx/v4.(*Conn).exec (conn.go:413)
     at
     github.com/jackc/pgx/v4.(*Conn).Exec (conn.go:396)
     at
     github.com/jackc/pgx/v4.(*Conn).Ping (conn.go:347)
     at
     main.connectDB (main.go:41)
     at
     main.main (main.go:15)

当我查看日志时,我看到...

Unable to connection to database: failed to connect to `host=35.236.60.144 user=postgres database=goapi`: dial error (dial tcp 35.236.60.144:5432: connect: connection timed out)
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0 回答 0