golang error interface

Golang’s Interfaces are a great way to make modular and testable code. However, in production applications you don’t have access to a console. custom errors A Complete Guide to JSON in Golang (With Examples) Updated on August 31, 2021. While languages like Java or C# explicitly implement interfaces, there is no explicit declaration of intent in Go. Under the hood, an interface in Golang consists of two elements: type and value. To parse JSON, we use the Unmarshal() function in package encoding/json to unpack or decode the data from JSON to a struct. From those coming from the world of other Object Oriented Languages like C# (Well Go is and is not your typical Object Oriented Language…another topic altogether), errors have been almost always… Conclusion. Golang Tutorial - Learn Go Programming Language Until Golang 1.5, which was released in 2015, the compiler and parts of the runtime were written in C. Is Golang object-oriented? Alternatively, exported context key variables' static type should be a pointer or interface. Go interface tutorial shows how to work with interfaces in Golang. To learn GoLang, if you have an understanding of C like syntax and object-oriented terminologies, then you can easily learn and use Golang. My surprise stems from the reuse of the interface construct when declaring type constraints. So, we use the bytes.NewBuffer, which gives us the bytes buffer based on our bytes slice. But avoid …. (float64) points to some significant issue with modeling the domain properly. Data structure serialization in databases can be difficult with golang types. Golang GoLang This example aims to demonstrate the implementation of interfaces in Go and import your custom package. A curated list of awesome Go frameworks, libraries and ... If you are looking for a helping hand to implement Golang JWT, then hire Golang developer to leverage our top-of-the-line Golang development expertise. error Instead, you should capture these errors and send them to an aggregation service for tracking and analysis. In this article, we'll take a look at how to handle errors using build-in Golang functionality, how you can extract information from the errors you are receiving and the best practices to do so. Implementing interface from different package golang. For any help, you can refer to … Golang provides multiple APIs to work with JSON including to and from built-in and custom data types using the encoding/json package. An interface type specifies a method set called its interface. Its “readable” part satisfies the io.Reader interface and serves our purpose. Run-length encoding (find/print frequency of letters in a string) Sort an array of 0's, 1's and 2's in linear time complexity The latest Go release, version 1.17, arrives six months after Go 1.16 . The panic method is used when the current program cannot be executed normally. The encoding/json package. Here, we have a set of multiple-choice questions and answers (quiz) on user interface in software engineering. Here, we have a set of multiple-choice questions and answers (quiz) on user interface in software engineering. Golang is very small, simple, and minimalist. In Go language, the interface is a custom type that is used to specify a set of one or more method signatures and the interface is abstract, so you are not allowed to create an instance of the interface. This buffer is both readable and writable. Golang is a programming language created ten years ago and was designed by team members at Google. Here is the internal function to assert an interface value to an interface type: // To call this function, compilers must assure // 1. itype is an interface type. Interfaces are tools to define sets of actions and behaviors. First, we need to import the os package, and then we can use the method. Go is an open source programming language that makes it easy to build simple, reliable, and efficient software. Golang and its runtime packages are all written in Go. Agile Mindset . As of recently, Uber is moving more towards building new services in Go and Java. In this tutorial, we managed to set up a connection to a MySQL and then perform some simple queries to that database and marshal the returned responses into a struct or an array of structs.This should hopefully give you everything you need in order to take things further and build your own Go applications on top of MySQL. Let us understand the concept of the interface in go language with some real-world examples. Golang might be not very dynamic, but it has an empty interface: interface{}. Code language: Go (go) #6 – Use the Built-in Log Package. This tutorial aims to demonstrate the implementation of interfaces in Golang. If you are looking for a helping hand to implement Golang JWT, then hire Golang developer to leverage our top-of-the-line Golang development expertise. Go was the first language I ever used that had interfaces, and I remember at the time the whole concept felt pretty confusing. Golang has an inbuilt package called os, and that package has a function called OpenFile() that can be used to open a file.We can open a file using the os.OpenFile() function. The encoding/json package. It allows us to recover the execution from stopping. (map[string] interface{})["ticket fv"]. Contribute to avast/retry-go development by creating an account on GitHub. It also has excellent handling of concurrency and parallel programming which makes it work wonders with microservices. GitHub Gist: instantly share code, notes, and snippets. It’s often tempting to roll your own logging package, but I would advise that in most cases, the standard log package is probably all you need. Example #1. Go should implement some form of exception handling that allows you to write try/catch blocks to group error-generating code and distinguish it from error-handling code. We could either unmarshal the JSON using a set of predefined structs, or we could unmarshal the JSON using a map[string]interface{} to parse our JSON into strings mapped against arbitrary data types. In the previous post titled "Grab JSON from an API" we explored how to interact with a HTTP client and parse JSON. Every single time you comment something out you then need to go and stub all the declared but not used errors. Chapter 7 Interfaces. Examples of Golang Interfaces. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Go (Golang) Standard Library Interfaces (Selected) This is not an exhaustive list of all interfaces in Go's standard library. Explore the trending and niche courses and learning maps; Learn about tuition fee, payment plans, and scholarships; Get access to webinars and self-paced learning videos What is Golang used for? This tutorial aims to demonstrate the implementation of interfaces in Golang. This tutorial introduces you to use duck typing and polymorphism and accept interfaces and return structs. Any team could implement standards and style checks as a commit hook or part of a CI/Gate job. You can think of the interface value nil as typed, and nil without type doesn’t equal nil with type. Eric is interested in building high-performance and scalable distributed systems and related technologies. Interfaces that have significant importance are also included. Eric is a systems guy. Golang and its runtime packages are all written in Go. A Computer Science portal for geeks. To parse JSON, we use the Unmarshal() function in package encoding/json to unpack or decode the data from JSON to a struct. I only list those I think are important. Such a type is said to implement the interface. So, we use the bytes.NewBuffer, which gives us the bytes buffer based on our bytes slice. Interface slice is different from the universal type empty interface, which can pass any type of value directly to the universal type, but can not pass any type of slice directly to the interface slice, because interface slice is not a universal type, but what is contained in it is a universal type, so you can also conversely Interface slice cannot be forced directly into a specific type of slice The recover function can be used to catch a panic and regain control. Golang JSON Marshal Example. You signed in with another tab or window. How can we get this typed attribute inserted and read from a sql database. Welcome to the Golang advanced tutorial series. I declare the function type which will return the value of type interface{}: type TaskFunction func () … Expand Your Digital Horizons With Us. If you know the structure that you are … The Go standard library offers a package that has all you need to perform JSON encoding and decoding. Code like t.TransObject["qty"]. This tutorial is for those who are looking to gain expertise and a solid understanding of golang. Printing errors and panics on the console are fine ways to handle them in development. An interface value is equal to nil only if both its value and dynamic type are nil. In the goal of the structure, maybe too wide. An interface is a set of function signatures and it is a specific type. Posting Form Request & Decoding JSON in Golang Panic and recover. Top Interview Coding Problems/Challenges! Go is a humanist sans-serif which resembles Lucida Grande and Go Mono is monospaced.Each of the fonts adhere to the WGL4 character set and were designed to be legible with a large x-height and distinct letterforms. In the example above, Foo() returns [nil, *os.PathError] and we compare it with [nil, nil]. 3. In the beginning, you will be able to define and declare an interface for an application and implement an interface in your applications. Eric is a systems guy. But they launched it in 2009 as an open-source programming language. The Got value comes from the object's String() method if it is available. This post is a continuation of that theme, which covers unit testing. Type Assert To Interface Types. Golang Interfaces Explained. // 3. How do we deal with maps of string to interface{} in our programs? Syntax: func Unmarshal(data []byte, v interface{}) error $ go version go version devel +e883d000f4 Wed May 29 13:27:00 2019 +0000 linux/amd64 It's typical that Go code has many lines of code that return errors as a consequence of other errors. A Complete Guide to JSON in Golang (With Examples) Updated on August 31, 2021. What the heck is an interface{}, anyway?Let's find out. Reads and Writes on the pipe are matched one to one except when multiple Reads are needed to consume a single Write. Introduction Prerequisites for querying Elasticsearch documents in Golang Create a Go script and import the necessary packages for the Elasticsearch client Declare the main() function and connect to Elasticsearch Check if the Elasticsearch cluster returned any API errors while connecting Declare a mapping interface and query string for the Elasticsearch API call … Golang has an inbuilt package called os, and that package has a function called OpenFile() that can be used to open a file.We can open a file using the os.OpenFile() function. When we assign a nil integer pointer to an interface in our example above, the interface becomes (*int)(nil), and it is not nil. Its “readable” part satisfies the io.Reader interface and serves our purpose. There are many ways to read a file. by default) and generates mocks for any interfaces it finds. The recover function can be used to catch a panic and regain control. But they launched it in 2009 as an open-source programming language. You can for sure write a smarter fake client (the example doesn’t handle errors for example), and can also use this strategy for a Redis-backed cache, for any API calls and also for SQL databases for example. Reading a file in GoLang. I get that. Welcome to the Golang advanced tutorial series. Users of WithValue should define their own types for keys. The building blocks of Golang are types, functions, and packages—in contrast to classes in object-oriented languages like Java. In the last tutorial we learnt how errors are represented in Go and how to handle errors from the standard library. Every single time you comment something out you then need to go and stub all the declared but not used errors. Go interfaces are implemented implicitly if a type provides the definition for all the methods declared in the interface. I consider the following book as essential reference and reading for Golang, you can purchase it on Amazon: Go Programming Language, Addison-Wesley.I'll cover some other … @RickO'Shea Assigning unused vars to a throwaway var _ is still a very cumbersome work around which demonstrably breaks developer flow. Maybe you could try a solution without empty interfaces and type assertions that wouldn't need lots … You can go for this approach keeping your code structure in mind. Create a file with a name interface.go and paste the below command and run the command go run the interface. Interfaces in Golang. Here we will explore some of the common and effective ways to read a file in Go. In this… Published on: ... And something that keeps coming up is the concept of interfaces. Parsing with Structs. Simple golang library for retry mechanism. Golang provides multiple APIs to work with JSON including to and from built-in and custom data types using the encoding/json package. An interface equals nil only if both the type and value are nil. It allows you to do encoding of JSON data as defined in the RFC 7159. Welcome to tutorial no. In some cases the output of an object is difficult to read (e.g., []byte) and it would be helpful for the test to print it differently.The following modifies how the Got value is formatted: It only has a handful of features. We also learnt how to extract … To avoid allocating when assigning to an interface{}, context keys often have concrete type struct{}. The views or opinions expressed here are solely Eric's own and do not necessarily represent those of any third parties. It allows us to recover the execution from stopping. 31 in Golang tutorial series.. But many times it increases code repetition. Bugsnag helps you prioritize and fix software bugs while improving your application stability In November 2016, the Go and Go Mono fonts were released by type designers Charles Bigelow and Kris Holmes specifically for use by the Go project. This is specified as a comma-separated list of elements of the form Repository=MockSensorRepository,Endpoint=MockSensorEndpoint, where Repository is the interface name and MockSensorRepository is the desired mock name (mock factory method and mock recorder will be named after the mock). When working with data we usually want to encode some Go struct into a json string. The Golang net/http Handler interface has serveHTTP method that takes the Response Writer interface as input and this allows the Golang HTTP Server to construct HTTP Response.. package main import ( "fmt" "net/http" ) type webServer int func (web webServer) ServeHTTP(w http.ResponseWriter, r *http.Request) { fmt.Fprintln(w, "Golang HTTP Server") } func main() { … Asking for help, clarification, or responding to other answers. You will be able to define and declare an interface for an application in custom packages and implement that interface in your applications. In this post, we will learn how to work with JSON in Go, in the simplest way possible. This buffer is both readable and writable. In this article, we'll take a look at how to handle errors using build-in Golang functionality, how you can extract information from the errors you are receiving and the best practices to do so. Custom Errors 12 November 2017. Example ¶ The building blocks of Golang are types, functions, and packages—in contrast to classes in object-oriented languages like Java. Eric is interested in building high-performance and scalable distributed systems and related technologies. I consider the following book as essential reference and reading for Golang, you can purchase it on Amazon: Go Programming Language, Addison-Wesley.I'll cover some other … The Golang standard library comes with a simple interface, context.Context, which is a little harder to understand and use than the others. Contribute to avast/retry-go development by creating an account on GitHub. Conclusion. Any team could implement standards and style checks as a commit hook or part of a CI/Gate job. It stops the function execution. Interfaces in Go are set implicitly, so all you have to do is define the required methods on your type and it will qualify as implementing that interface. Parsing with Structs. Go is a humanist sans-serif which resembles Lucida Grande and Go Mono is monospaced.Each of the fonts adhere to the WGL4 character set and were designed to be legible with a large x-height and distinct letterforms. It only has a handful of features. Panic occurs when an unexpected wrong thing happens. This interface + decoration strategy can be used for other features, for example, for circuit breakers and things like that. First, we need to import the os package, and then we can use the method. Reload to refresh your session. A value of interface type can hold any value that implements those methods. This tutorial introduces you to use duck typing and polymorphism and accept interfaces and return structs. Here is a refactored version of our earlier example. I used some third-party libraries in database because they used a large number of internal ones. But there are two features that… Posting Form Request & Decoding JSON in Golang Its main features are a syntax similar to C, being strongly typed, and having a garbage collector. The views or opinions expressed here are solely Eric's own and do not necessarily represent those of any third parties. As you can see multiple stat inside a FileInfo interface is returned by the stat function. Please be sure to answer the question.Provide details and share your research! Golang or Go Programming Language is a statically-typed and procedural programming language having syntax similar to C language. A detailed tutorial about arrays and slices covering the internal implementation details too. Maybe you could try a solution without empty interfaces and type assertions that wouldn't need lots … Pipe creates a synchronous in-memory pipe. It stops the function execution. Go is an open source programming language that makes it easy to build simple, reliable, and efficient software. Recover is the opposite of it. The tutorial in this series are elaborative and we have tried to cover all concepts with examples. The standard library defines a type, Logger, which you can use to customize your logging in an idiomatic way.If you don’t want that much power and responsibility, you can … Other way of using the interface to break cycle can be extracting code into separate 3rd package that act as bridge between two packages. Until Golang 1.5, which was released in 2015, the compiler and parts of the runtime were written in C. Is Golang object-oriented? Code language: Go (go) Example marshal JSON from struct (encode) The encoding/json package exposes a json.Marshal function that allows us to generate the JSON encoding of any value, assuming that type has an encoder implemented. The difficulties in getting the context.Context interface may be the naming, maybe not super appropriate. For instance: package main import ( "fmt" "os" ) type Animal interface { Say() string Greet(Animal) } type Person struct { } func (p Person) Say() string { return "Hey there bubba!" Panic and recover. We have a few options when it comes to parsing the JSON that is contained within our users.json file. This modifies the gomock.Eq(15) matcher's output for Want: from is equal to 15 to is equal to fifteen.. Modifying Got. The problem is that it creates a bloated interface with lots of function and that the interface might need to change when we add new functionality. We have a few options when it comes to parsing the JSON that is contained within our users.json file. There are many ways to read a file. 31 in Golang tutorial series.. A variable of interface type can store a value of any type with a method set that is any superset of the interface. Users of WithValue should define their own types for keys. Syntax: func Unmarshal(data []byte, v interface{}) error For any help, you can refer to … One of the fundamental aspects of UNIX is that everything is a file. To learn GoLang, if you have an understanding of C like syntax and object-oriented terminologies, then you can easily learn and use Golang. They help objects to rely on abstractions and not on concrete implementations of other objects. Panic. Once the panic statement is called, the program crashes with a log statement containing panic values, and the deferred functions are executed all at once. When I was learning Golang, one of the concepts that took me the most time to grasp was Interfaces. Or in the fact, that it is not an everyday concern for some software. An interface type specifies a method set called its interface. Panic occurs when an unexpected wrong thing happens. Is Golang easy to learn? Most of its changes are in the implementation of the toolchain, runtime, and libraries. Here we will explore some of the common and effective ways to read a file in Go. You can see how we calculate our billing and distribution as it is open to the entire community. This time we made the greeting feature more generic by defining a function called Greet which takes a param of interface type Namer. The Go standard library offers a package that has all you need to perform JSON encoding and decoding. 📊 Salaries 🏢 Companies 👤 Developers Golang Unzip File Example. The value of … We can compose different behaviors by grouping multiple interfaces. Agile is not a principal or a method, but it’s an integral part of being Agile that is guided by principles, defined by values and manifested through various practices. We will learn how to convert from JSON raw data (strings or bytes) into Go types like structs, arrays, and slices, as well as unstructured data like maps and empty interfaces. Golang error handling is fun because it is a first class citizen in the language, but the built in behavior is bare bones. to refresh your session. The good news is, all the default types in Go have an encoder created out-of-the-box, and you’ll usually be working with … Golang offers a mechanism to allow for this: Implement Scanner and Valuer database/sql interfaces. : //golangdocs.com/errors-exception-handling-in-golang '' > Golang < /a > Sponsorships called Greet which takes a param interface... To Go and how to work with JSON in Golang have access to a.! Define and declare an interface by implementing its functions a panic and recover represent those of any parties. That had interfaces, there is no explicit declaration of intent in Go a mechanism to allow this! An interface in Go and how to work with JSON in Golang and how to handle from... Simplest way possible on concrete implementations of other objects said to implement the.. Our bytes slice qty '' ] to Parsing the JSON that is contained within users.json... The context.Context interface may be the naming, maybe too wide type with a set! Changes are in the beginning, you will be able to define and declare interface! Within our users.json file contained within our users.json file post is a continuation of that theme, which us... Multiple interfaces contribute to avast/retry-go development by creating an account on GitHub 📊 🏢... Time we made the greeting feature more generic by defining a function called Greet which takes a of... Eric is interested in building high-performance and scalable distributed systems and related technologies the first language I ever used had... Of itype if a type Go and Java actions and behaviors 📊 🏢... The GOT value comes from the standard library offers a mechanism to allow for this implement. Connect code golang error interface an io.Writer application and implement an interface { } in programs., notes, and then we can use the method it can be used to connect expecting... Float64 ) points to some significant issue with modeling the domain properly aspects of UNIX that. Allow for this approach keeping your code structure in mind Go run the command Go run the interface account GitHub. > interfaces in Go C. is Golang object-oriented one to the entire community interface be... Is for those who are looking to gain expertise and a solid understanding of Golang are,... Learnt how errors are represented in Go and how to work with JSON Golang. And parallel programming which makes it work wonders with microservices well explained Computer Science and programming,... Domain properly and then we can use the method to C, being strongly,. The below command and run the interface bytes slice implemented implicitly if a type is used the... For any interfaces it finds connect code expecting an io.Reader with code expecting an io.Writer points... Inserted and read from a sql database not necessarily represent those of any with. You should capture these errors and send them to an interface type Namer modeling. The type and value are nil create < /a > Agile Mindset ''... ) are included share code, notes, and minimalist the concept of interfaces building high-performance and scalable systems. Not be executed normally fmt ) are included and libraries and Decoding in C. is Golang easy learn... To talk about interfaces in Golang the RFC 7159 data as defined in last. Defining a function called Greet which takes a param of interface type can store a value of any parties... But not used errors account on golang error interface be sure to answer the question.Provide details and share research... // 2. outI is nil or stores the address of a value any... These errors and send them to an aggregation service for tracking and analysis //zetcode.com/golang/interface/ >... Expressed here are solely Eric 's own and do not necessarily represent those of any third parties string ] {. - learn Golang by Examples < /a > Top interview Coding Problems/Challenges we can use method. Code like golang error interface [ `` qty '' ] programming language but there two...: //www.sohamkamani.com/golang/json/ '' > interfaces are tools to define and declare an interface { }, anyway? let find. Perform JSON encoding and Decoding > understanding polymorphism in Go and stub all the declared but not errors... Need to Go and how to work with JSON in Golang ( with Examples /a... Value that implements those methods how can we get this typed attribute inserted and read a. The values are indeed equal of its changes are in the simplest way.... Of other objects other objects used that had interfaces, there is no explicit declaration of intent in.!, which covers unit testing on the pipe are matched one to one except when multiple reads are needed consume! Define sets of actions and behaviors Decoding JSON in Golang < a href= https! Stub all the methods declared in the beginning, you should capture these errors and send them to interface. In our programs any team could implement standards and style checks as a commit hook or part a! Griesemer, Rob Pike, and then we can use the bytes.NewBuffer, which covers testing... Context keys often have concrete type struct { }, anyway? let 's find out of any third.... Attribute inserted and read from a sql database and programming articles, quizzes and practice/competitive programming/company Questions! Time the whole concept felt pretty confusing //stackoverflow.com/questions/70467545/errorinterface-must-be-a-pointer-to-struct-error-returned-in-fiber-golang-ho '' > Golang tutorial - Golang. Is used when the current program can not be executed normally to answer the question.Provide and! We can compose different behaviors by grouping multiple interfaces except when multiple are. Are indeed equal billing and distribution as it is a continuation of that theme, which was released 2015... Way” import Chain: package p1 - > package m1 & package p2 - > m1! Welcome to the correct type, the compiler and parts of the common and ways! Programming/Company interview Questions type Assert to interface { } an aggregation service for tracking and analysis feature generic. Can use the method a large number of internal ones concrete type struct {.... Rob Pike, and having a garbage collector for other features, for example, for circuit breakers and like! > 📊 Salaries 🏢 Companies 👤 Developers Golang Unzip file example: //www.sohamkamani.com/golang/json/ >! //Www.Sohamkamani.Com/Golang/Json/ '' > function in Golang qty '' ] not on concrete of! Context keys often have concrete type struct { } ) [ `` qty ]! Is an interface for an application and implement an interface for an application and implement an in. An open-source programming language struct into a JSON string serves our purpose //pauldigian.com/golang-and-context-an-explanation '' JSON! We calculate our billing and distribution as it is open to the Golang advanced tutorial series type Assert interface! Contains well written, well thought and well explained Computer Science and programming articles, quizzes and practice/competitive programming/company Questions... Golang ( with Examples tutorial we learnt how errors are represented in Go and stub the... Calculate our billing and distribution as it is a set of function signatures and it is to. Go was the first language I ever used that had interfaces, and without... To handle errors from the standard library and style checks as a hook... Type, the compiler and parts of the toolchain, runtime, and nil type... Packages ( like io, fmt ) are included pipe are matched one to the next level in Go how. And declare an interface for an application in custom golang error interface and implement an interface a! C # explicitly implement interfaces, there is no explicit declaration of intent in Go with! Grouping multiple interfaces, functions, and having a garbage collector gain expertise and a solid understanding of Golang types. Used a large number of internal ones awesome Go frameworks, libraries and software GOT QUERIES a name interface.go paste! Used for other features, for circuit breakers and things like that //sagarsonwane230797.medium.com/understanding-polymorphism-in-go-d704944e9816 '' > polymorphism. //Gist.Github.Com/Asukakenji/Ac8A05644A2E98F1D5Ea8C299541Fce9 '' > Golang < /a > custom errors 12 November 2017 existing one the! An account on GitHub in this post, we use the bytes.NewBuffer, covers. Examples - GeeksforGeeks < /a > Eric Ma consume a single Write JSON string how can we this! To cover all concepts with Examples service for tracking and analysis, for circuit and... # explicitly implement interfaces, and then we can compose different golang error interface by grouping multiple interfaces by... Open-Source programming language but not used errors interfaces and return structs comment something out you need. Used when the current program can not be executed normally is Golang easy to learn ( with Examples the of. Value of any type with a method set that is contained within our file... List of awesome Go frameworks, libraries and software '' ] implement interfaces, there is no declaration! As defined in the RFC 7159 Go interface < /a > Golang /a. Implement the interface your custom package the pipe are matched one to the next.. Its changes are in the fact, that it is available I used some third-party libraries in database because used. And golang error interface like that type is said to implement the interface heck is an {! Get this typed attribute inserted and read from a sql database: //stackoverflow.com/questions/21743841/how-to-avoid-annoying-error-declared-and-not-used '' > Golang < /a > Mindset... On abstractions and not on concrete implementations of other objects interface by implementing its functions is defined by set. Features that… < a href= '' https: //www.edureka.co/blog/golang-tutorial/ '' > understanding polymorphism in Go and how to errors. If a type is said to implement the interface in your applications is defined by a set of signatures. Number of internal ones introduces you to do encoding of JSON data as defined in RFC! A solid understanding of Golang we need to Go and import your custom.! Open-Source programming language type can hold any value that implements those methods //stackoverflow.com/questions/70467545/errorinterface-must-be-a-pointer-to-struct-error-returned-in-fiber-golang-ho '' Golang. Go standard library type, the values are golang error interface equal: //gist.github.com/asukakenji/ac8a05644a2e98f1d5ea8c299541fce9 '' > Golang < >!

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golang error interface