[go-nuts] Help understanding slices, variable arguments, and passing slices to functions
I have some code whereby I am iterating over some data, putting that data into a buffer slice defined outside the loop, then passing the contents of that buffer slice to a function which returns a struct containing that data. See the playground link as a stripped down demonstration of what I'm actually doing: https://go.dev/play/p/66Ynp7W2TQ8 With the above example, the code outputs, [1 2 3] [1 2 3] instead of what I would expect, which would be, [0 1 2] [1 2 3] I have two fixes for this. The first would be to move the buf slice inside the most outer loop so that a new buffer slice is created on each iteration. The other is to allocate a new tmp slice within the MakeValues function and to copy the contents of a to that tmp slice and use that in the Args struct parameter. My initial understanding of slices in Go, is that they are passed by value to functions, so a copy of the slice's contents should be given to the MakeValues function in this case, yet the observed behaviour indicates that this is not the case? As stated, I have a solution to my issue, I would just like to better understand the semantics of slices and how they are passed to functions. And what the best approach to take for my situation would be, whereby I am using a temporary buffer slice that is cleared after each iteration for storing data to then pass somewhere else. - Andrew -- 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/ede82dfcca6e43062309440727800e15533d0c8f.camel%40andrewpillar.com.
[go-nuts] req an HTTP scripting language
Hi all, req is an HTTP scripting language that I've been working on. The intention behind it is to provide a high-level language for quickly scraping data off of web APIs or web pages. Just recently, v1.1.0 has been released which adds support for working with cookies. Feel free to check it out if weird scripting languages are your thing. GitHub: https://github.com/andrewpillar/req Initial blog post: https://andrewpillar.com/programming/2022/02/26/req-an-http-scripting-language/ -- 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/de215af833a37cb7f7ca1ba724d9260d3d93ce70.camel%40andrewpillar.com.
Re: [go-nuts] Structured configuration in Go
> I think there are two big advantages to making your application > consume either plain JSON or YAML configs: > 1. Everyone is familiar with them > 2. You can use a more advanced tool like cue or jsonnet to generate > them I can see why people would prefer JSON, and I think it's fine for storing configuration that is edited by the program itself. I don't think JSON is a very good interface for humans however as it can be surprisingly verbose at times. -- 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/e1935a71820ec9b821054590910ecd0ef438fe2e.camel%40andrewpillar.com.
Re: [go-nuts] Structured configuration in Go
> Out of interest, have you come across CUE? > I have heard of it, but not explored it in depth. At a glance it seems too heavyweight for what I wanted. -- 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/74afd692895542714a70d3cf884b1db1ea8fc2a9.camel%40andrewpillar.com.
[go-nuts] Structured configuration in Go
An article I wrote about a new configuration library I developed in Go for working with structured configuration. Article: https://andrewpillar.com/programming/2022/04/09/structured-configuration-in-go/ Repo: https://github.com/andrewpillar/config -- 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/cce0eeb5a085f6c7539774790d813cef254a4a0b.camel%40andrewpillar.com.
Re: [go-nuts] Golang library for - ORM & Schema Migration
I created a simple migration tool called mgrt [1], which operates on pure SQL scripts that are defined by the user. It has support for MySQL, SQLite and PostgreSQL. Give it a try if you're looking for a simple migration tool that just uses plain SQL under the hood. It's written in Go, so building it won't be too hard. [1] - https://github.com/andrewpillar/mgrt Accidentally replied to the wrong thread on the list with this :/ -- 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/f3abdba2-7e2b-4bdb-9054-b9694eb48445%40www.fastmail.com.
Re: [go-nuts] Re: Can’t get latest package version with modules
>Thank you all. For schema migration i am looking for similar tool like flyway. I created a simple migration tool called mgrt [1], which operates on pure SQL scripts that are defined by the user. It has support for MySQL, SQLite and PostgreSQL. Give it a try if you're looking for a simple migration tool that just uses plain SQL under the hood. It's written in Go, so building it won't be too hard. [1] - https://github.com/andrewpillar/mgrt -- 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/51af693e-b999-41eb-8563-d199d7b5647e%40www.fastmail.com.
Re: [go-nuts] How to use .toml file to parse IP address and port to http server
Use net.JoinHostPort to concatenate the values you have in the struct
and pass the to http.Server struct.
if _, err := toml.Decode("config.toml", ); err != nil {
// handle error
}
addr, err := net.JoinHostPort(conf.Address, conf.PORT)
if err != nil {
// handle error
}
src := {
Addr: addr,
}
Be sure to set explicit struct tags on your destination struct that
will be used for unmarshalling the toml. This way the decoder will know
which struct fields to populate.
type Config struct {
PORTstring `toml:"port"`
Address string `toml:"address"`
}
This will only be necessary though if you want the fields to map
differently depending on their name.
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Re: [go-nuts] Dependency injection in gorillamux handlers
Why don't you use context.WithValue(r.Context(), , ) for passing the injected values you want to your HTTP handlers. Then defer the logic for retrieving whatever you want for that handler to a middleware function. -- 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/732f914e-e99d-4473-bafa-cf624e65af6d%40www.fastmail.com.
Re: [go-nuts] listen port auto allocation questions
> How can i'm avoid such errors and not specify ports by hand? Perhaps you could use some kind of central store for storing the most recently used port? Simply take that port from the store, increment it, and place it back into the store for the next micro-service to use. I think etcd [1], may be a good use case for this. [1] - https://github.com/etcd-io/etcd -- Andrew -- 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/9bd527fe88e87a4341b9efca7bba5eb32d1a9873.camel%40andrewpillar.com. For more options, visit https://groups.google.com/d/optout.
[go-nuts] Some thoughts on query building in Go
I put together a blog post exploring some of the approaches that could be taken for idiomatic query building in Go. The Tl;DR of it is this: First class functions are an idiomatic way of doing SQL query building in Go. Check out the repository containing some example code I wrote testing this out: https://github.com/andrewpillar/query. I'd be interested in hearing what other people have to say with regards to this subject matter. https://andrewpillar.com/programming/2019/07/13/orms-and-query-building-in-go/ -- Andrew -- 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/8b47ed4c0cc1b5bccea6147878ad9e515909c8e7.camel%40andrewpillar.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Does the code have any concurrent problem?
Have you tried building with the -race flag? go build - race This should help you figure out any data race conditions that may occur. -- 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/1211e33f-f835-4d4f-bcc8-3fb1360ea4df%40www.fastmail.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: Best ORM for Golang and their framework like Revel and Martini
I made a comment about this on an HN thread about ORMs in Go. > Personally I think an active record style ORM for Go like gorm is a poor fit for a language that doesn't come across as inherently OOP. Going through some of the documentation for gorm, it seems to rely heavily on method chaining which for Go seems wrong considering how errors are handled in that language. In my opinion, an ORM should be as idiomatic to the language as possible. > I've used sqlx[1] before, and it feels pretty idiomatic to Go. You tag your structs with their respective database columns, write up a query, and hand it to sqlx to perform the deserialisation of the data. I've also come across squirrel[2] too, though I haven't used it, it does look rather interesting. > [1] - https://github.com/jmoiron/sqlx > [2] - https://github.com/masterminds/squirrel I agree with you when you say that ORMs help with modeling relations. However I think the following the design of ActiveRecord is the wrong approach to take when it comes to ORMs in Go. Also, regarding database migrations in Go. I made a simple tool for performing database migrations. It allows you to write plain SQL, and have these SQL scripts be performed against the database an logged. Right now it supports SQLite, MySQL, and PostgreSQL, you can find it at https://github.com/andrewpillar/mgrt. -- 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/e2191307-c64f-661e-54a5-d92a19d3390f%40andrewpillar.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] Re: Best ORM for Golang and their framework like Revel and Martini
I made a comment about a similar topic on an HN thread, about ActiveRecord style ORMs in Go. > Personally I think an active record style ORM for Go like gorm is a > poor fit for a language that doesn't come across as inherently OOP. > Going through some of the documentation for gorm, it seems to rely > heavily on method chaining which for Go seems wrong considering how > errors are handled in that language. In my opinion, an ORM should be > as idiomatic to the language as possible. > I've used sqlx[1] before, and it feels pretty idiomatic to Go. You tag > your structs with their respective database columns, write up a query, > and hand it to sqlx to perform the deserialisation of the data. I've > also come across squirrel[2] too, though I haven't used it, it does > look rather interesting. > [1] - https://github.com/jmoiron/sqlx > [2] - https://github.com/masterminds/squirrel You're right, ORMs do help with modelling data, but I think the ActiveRecord approach is the wrong way of going in regards to Go. Also, regarding database migrations in Go, I made a simple migration tool for SQL migrations. You simply write plain SQL scripts, and these get performed and logged against the database. Right now it supports SQLite, MySQL, and PostgreSQL, and you can check it out here: https://github.com/andrewpillar/mgrt. -- 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/e269ee70-6a28-6437-dacd-ecac1d9760e4%40andrewpillar.com. For more options, visit https://groups.google.com/d/optout.
