For full, actual python inside Go, one could combine: (a) https://github.com/iodide-project/pyodide has the python scientific stack compiled to wasm (python + numpy + scipy + numplotlib)
and (b) either https://github.com/go-interpreter/wagon or https://github.com/perlin-network/life: each provide a wasm byte-code interpreter as a Go library. On Monday, December 10, 2018 at 2:39:09 AM UTC-6, mic...@scylladb.com wrote: > > > > On Friday, December 7, 2018 at 9:05:02 PM UTC+1, Nate Finch wrote: >> >> I’d like to announce starlight - >> https://github.com/starlight-go/starlight. >> >> >> Starlight wraps google’s Go implementation of the starlark python dialect >> <https://github.com/google/starlark-go> (most notably found in the Bazel >> build tool). Starlight makes it super easy for users to extend your >> application by writing simple python scripts that interact seamlessly with >> your current Go code… with no boilerplate on your part. >> > > Do you think it is suitable for porting python applications? > Usually you go through cgo like this > https://www.datadoghq.com/blog/engineering/cgo-and-python/ it could be an > interesting alternative. > > >> >> *Parser by google* >> >> The parser and runner are maintained by google’s bazel team, which write >> starlark-go. Starlight is a wrapper on top of that, which makes it so much >> easier to use starlark-go. The problem with the starlark-go API is that it >> is more built to be a used as configuration, so it assumes you want to get >> information out of starlark and into Go. It’s actually pretty difficult to >> get Go information into a starlark script…. unless you use starlight. >> >> *Easy two-way interaction* >> >> >> Starlight has adapters that use reflection to automatically make any Go >> value usable in a starlark script. Passing an *http.Request into a >> starlark script? Sure, you can do name = r.URL.Query()["name"][0] in the >> python without any work on your part. >> >> Starlight is built to *just work* the way you hope it’ll work. You can >> access any Go methods or fields, basic types get converted back and forth >> seamlessly… and even though it uses reflection, it’s not as slow as you’d >> think. A basic benchmark wrapping a couple values and running a starlark >> script to work with them runs in a tiny fraction of a millisecond. >> >> The great thing is that the changes made by the python code are reflected >> in your go objects, just as if it had been written in Go. So, set a field >> on a pointer to a struct? Your go code will see the change, no additional >> work needed. >> >> *100% Safe* >> >> >> The great thing about starlark and starlight is that the scripts are 100% >> safe to run. By default they have no access to other parts of your project >> or system - they can’t write to disk or connect to the internet. The only >> access they have to the outside is what you give them. Because of this, >> it’s safe to run untrusted scripts (as long as you’re not giving them >> dangerous functions to run, like os.RemoveAll). But at the same time, if >> you’re only running trusted scripts, you can give them whatever you want ( >> http.Get? Sure, why not?) >> >> *Caching* >> >> >> In a production environment, you probably want to only read a script once >> and parse it once. You can do that with starlight’s Cache. This cache >> takes a list of directories to look in for scripts, which it will read and >> parse on-demand, and then store the parsed object in memory for later use. >> It also uses a cache for any load() calls the scripts use to load >> scripts they depend on. >> >> *Work Ongoing* >> >> >> Starlight is still a work in progress, so don’t expect the API to be >> perfectly stable quite yet. But it’s getting pretty close, and there >> shouldn’t be any earth shattering changes, but definitely pin your imports. >> Right now it’s more about finding corner cases where the starlight wrappers >> don’t work quite like you’d expect, and supporting the last few things that >> aren’t implemented yet (like channels). >> >> >> *Example* >> >> >> Here's a simple example of how easy it is to extend the behavior of your >> application with a python script. Just pass starlight whatever go values >> you want your python script to act on, and any changes the python code >> makes get reflected in your go code. >> >> >> package main >> >> import ( >> "fmt" >> "log" >> "time" >> >> "github.com/starlight-go/starlight" >> ) >> >> // Starlight makes it easy to get values in and out of your starlark >> scripts. >> // Just pass in pointers to values that you want changed, or callback >> functions >> // that propagate data. >> >> // In theory, starlight also returns all global variables set by the >> script, but >> // in real programs, you need well-defined outputs for your calling code >> to act on. >> // If I write a script that creates a variable called nate_is_awesome = >> 1337 ... your >> // go code probably isn't going to care that the variable exists. >> >> // The best way to do it is to write a "results" struct that you pass in, >> just >> // as you would for any other function. >> >> type Page struct { >> Name string >> Date time.Time >> Contents string >> IsDraft bool >> } >> >> const code = ` >> def run(): >> if "nate" in page.Name: >> # capitalize words >> page.Name = page.Name.title() >> page.Name += " " + page.Date.Format("2006/01/02") >> page.IsDraft = False >> run() >> ` >> >> func main() { >> p := &Page{ >> Name: "a story about nate", >> Date: time.Now(), >> Contents: "I like to write go code.", >> IsDraft: true, >> } >> globals := map[string]interface{}{ >> "page": p, >> } >> _, err := starlight.Eval([]byte(code), globals, nil) >> if err != nil { >> log.Fatal(err) >> } >> fmt.Printf("%v is draft: %v\n", p.Name, p.IsDraft) >> } >> >> // Running it: >> // $ go run inout.go >> // A Story About Nate 2018/12/07 is draft: false >> >> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. 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