Common debugging problems and solutions in golang framework

Common debugging problems in Go framework and their solutions: HTTP request timeout: check server availability, timeout settings, separate connection verification. JSON parsing error: "json: unexpected end of JSON input": Check the JSON format, data source, and use tools to check the format. Database connection issues: Verify the server is running, connection information is correct, and SSL/TLS is configured.

Common debugging problems and solutions in Go framework

When developing and debugging Go applications, you may encounter various problems. This article introduces some common debugging problems and their solutions in the Go framework.

1. HTTP request timeout

Problem: The HTTP request does not respond for a long time, resulting in timeout.

Solution:

• Check whether the target server is available.
• Check whether net.DialTimeout and net.ReadTimeout are set to reasonable values.
• Try to connect to the target server individually using a tool such as curl to verify its responsiveness.

2. "json: unexpected end of JSON input" error

Problem: "json: unexpected end of JSON input" error occurs when parsing JSON data .

Workaround:

• Make sure the JSON data is properly formatted with no missing brackets or quotes.
• Check that the JSON data is loaded from a valid source (e.g. correctly encoded to UTF-8).
• Use debugging tools (such as jsonindent) to check the format of the JSON data.

3. Database connection problem

Problem: An error occurred when trying to connect to the database, such as dial tcp: connect: connection refused.

Workaround:

• Confirm that the database server is running and listening on the appropriate port.
• Check whether the database connection information is correct (such as host name, port, user name and password).
• If using an SSL/TLS connection, make sure the certificate and key are configured correctly.

Practical case

When writing a Go application using the GORM framework, I encountered the following problem:

package main

import (
    "fmt"
    "gorm.io/gorm"
)

func main() {
    db, err := gorm.Open("mysql", "user:password@/database")
    if err != nil {
        panic(err)
    }
    var user User
    if err := db.First(&user).Error; err != nil {
        panic(err)
    }
    fmt.Println(user)
}

type User struct {
    ID   uint
    Name string
}

The program is trying to retrieve from the databaseUser fails with "sql: no rows in result set" error. After some investigation, the following problem was found:

users

table is missing in the
• schema.
• User The model's ID field is not marked as auto-incrementing.

The error was resolved by fixing these two issues and the program can run normally.

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