


How to Share Custom Data Types Between Go Plugins and the Main Application?
Custom Data Type Sharing in Go Plugins
In Go, you can define custom data types in plugins. However, sharing these data types between a plugin and the main application requires careful consideration.
The Limitations of Symbol Lookup
When accessing exported symbols from a plugin, you can type assert them into an interface. However, directly type asserting them into a struct is not possible using symbol lookup alone.
A Custom Data Type as an Example
Let's consider the following example:
<code class="go">// plugin.go package main type Person struct { Name string } var P Person = Person{ Name: "Emma", }</code>
<code class="go">// app.go package main import ( "fmt" "os" "plugin" ) func main() { plug, err := plugin.Open("./plugin.so") if err != nil { fmt.Println(err) os.Exit(1) } sym, err := plug.Lookup("P") if err != nil { fmt.Println(err) os.Exit(1) } var p Person p, ok := sym.(Person) if !ok { fmt.Println("Wrong symbol type") os.Exit(1) } fmt.Println(p.Name) // Panic: "Wrong symbol type" }</code>
In this example, the P symbol is a Person struct. However, the type assertion in the main app fails with an error.
The Solution: Separate Type Definition
The key to sharing custom data types between a plugin and the main application is to define the type separately. This way, both the plugin and the main app can refer to the same type definition.
Example with Separate Type Definition
<code class="go">// type.go package filter type Filter struct { Name string Age int }</code>
<code class="go">// plugin.go package main import "play/filter" var MyFilter filter.Filter = filter.Filter{ Name: "Bob", Age: 21, } func CreateFilter() filter.Filter { return filter.Filter{ Name: "Bob", Age: 21, } }</code>
<code class="go">// app.go package main import ( "fmt" "log" "os" "play/filter" "plugin" ) func main() { p, err := plugin.Open("plugin.so") if err != nil { log.Fatal(err) } mf, err := p.Lookup("MyFilter") if err != nil { log.Fatal(err) } f, ok := mf.(*filter.Filter) if !ok { log.Fatal("Wrong symbol type") } fmt.Printf("%+v\n", f) // Output: &{Name:Bob Age:21} }</code>
By defining the Filter type in a separate package, the plugin and the main app can both import it and use it for type assertions.
The above is the detailed content of How to Share Custom Data Types Between Go Plugins and the Main Application?. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











Go language performs well in building efficient and scalable systems. Its advantages include: 1. High performance: compiled into machine code, fast running speed; 2. Concurrent programming: simplify multitasking through goroutines and channels; 3. Simplicity: concise syntax, reducing learning and maintenance costs; 4. Cross-platform: supports cross-platform compilation, easy deployment.

Golang is better than C in concurrency, while C is better than Golang in raw speed. 1) Golang achieves efficient concurrency through goroutine and channel, which is suitable for handling a large number of concurrent tasks. 2)C Through compiler optimization and standard library, it provides high performance close to hardware, suitable for applications that require extreme optimization.

Golang is better than Python in terms of performance and scalability. 1) Golang's compilation-type characteristics and efficient concurrency model make it perform well in high concurrency scenarios. 2) Python, as an interpreted language, executes slowly, but can optimize performance through tools such as Cython.

Goimpactsdevelopmentpositivelythroughspeed,efficiency,andsimplicity.1)Speed:Gocompilesquicklyandrunsefficiently,idealforlargeprojects.2)Efficiency:Itscomprehensivestandardlibraryreducesexternaldependencies,enhancingdevelopmentefficiency.3)Simplicity:

Golang and Python each have their own advantages: Golang is suitable for high performance and concurrent programming, while Python is suitable for data science and web development. Golang is known for its concurrency model and efficient performance, while Python is known for its concise syntax and rich library ecosystem.

The performance differences between Golang and C are mainly reflected in memory management, compilation optimization and runtime efficiency. 1) Golang's garbage collection mechanism is convenient but may affect performance, 2) C's manual memory management and compiler optimization are more efficient in recursive computing.

Golang and C each have their own advantages in performance competitions: 1) Golang is suitable for high concurrency and rapid development, and 2) C provides higher performance and fine-grained control. The selection should be based on project requirements and team technology stack.

C is more suitable for scenarios where direct control of hardware resources and high performance optimization is required, while Golang is more suitable for scenarios where rapid development and high concurrency processing are required. 1.C's advantage lies in its close to hardware characteristics and high optimization capabilities, which are suitable for high-performance needs such as game development. 2.Golang's advantage lies in its concise syntax and natural concurrency support, which is suitable for high concurrency service development.
