expr
GJSON
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expr
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Solving the Expression Problem in Go
Not diminishing the article at all, there's massive value I've gained from leveraging this runtime solution in multiple projects: https://github.com/antonmedv/expr
The language is easy enough for people to pick-up.
- Expr Release v1.15
- Expr v1.14 release: Go expression language
- Expr – expression language with type checker
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FireScroll - The config database to deploy everywhere (now with conditional statements!)
Uses the [expr](https://github.com/antonmedv/expr) language to achieve this and I've been super happy with the results.
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Library to analyze an arbitrary JSON string
I have been using expr (https://github.com/antonmedv/expr) to do something like this for a while. no complains so far.
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[gcalc] A simple calculater in golang
If you wanted it to not require putting in the operation first and just accept string equations (without using something like https://github.com/antonmedv/expr) you could parse, tokenize and then process the input.
- Go Expression Language
- Polymode: Multiple Major Modes and How to Use SQL and Python in One Buffer
- Expr (Go expression language) releases v1.11
GJSON
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Rob Pike: Gobs of data (2011)
Someone made a benchmark of serialization libraries in go [1], and I was surprised to see gobs is one of the slowest ones, specially for decoding. I suspect part of the reason is that the API doesn't not allow reusing decoders [2]. From my explorations it seems like both JSON [3], message-pack [4] and CBOR [5] are better alternatives.
By the way, in Go there are a like a million JSON encoders because a lot of things in the std library are not really coded for maximum performance but more for easy of usage, it seems. Perhaps this is the right balance for certain things (ex: the http library, see [6]).
There are also a bunch of libraries that allow you to modify a JSON file "in place", without having to fully deserialize into structs (ex: GJSON/SJSON [7] [8]). This sounds very convenient and more efficient that fully de/serializing if we just need to change the data a little.
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1: https://github.com/alecthomas/go_serialization_benchmarks
2: https://github.com/golang/go/issues/29766#issuecomment-45492...
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3: https://github.com/goccy/go-json
4: https://github.com/vmihailenco/msgpack
5: https://github.com/fxamacker/cbor
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6: https://github.com/valyala/fasthttp#faq
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7: https://github.com/tidwall/gjson
8: https://github.com/tidwall/sjson
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Jj: JSON Stream Editor
```
I don't think there is a way to sort an array, though. However, there is an option to have keys sorted. Personally, I don't think there is much annoyance in that. One could just pipe `jj` output to `sort | uniq -c`.
[0]: https://github.com/tidwall/gjson/blob/master/SYNTAX.md
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Library to analyze an arbitrary JSON string
I’m using GJSON, so far so good!
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Mapping json fields in api calls to a struct to store them in a database or cache
If the fields you need are just a small subset of the whole json, maybe https://github.com/tidwall/gjson might be of use to read only those (using jsonpath) without needing to create complete corresponding structs.
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Which CPU to buy based on profiling
Thank you for the reminder, it's never too much of it :) Didn't say it, but the code was pprof-iled many times and i can really say it's well optimized. I use own libraries with on-the-fly equations (sums, avgs, emas, stds, ...) wherever possible and also made custom json parser as json messages are in fixed format, so the parser is about 10x faster than gjson. I optimized it to the point that I avoided using maps, and rather iterate via slice where ever possible.
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Jetro - transform and query JSON format
You are right, for learning purposes this fit my needs, but I can imagine an approach similar to this repo: https://github.com/tidwall/gjson
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Any way to convert unknown/dynamic json to generic object structure
https://github.com/tidwall/gjson is a relatively sensible library if this is something you need to deal with and the structure is actually unknowable.
- Need help with getting the grandchild in nested JSON
- Double down on python or learn Go
- Ad hoc JSON parsing
What are some alternatives?
govaluate - Arbitrary expression evaluation for golang
jsoniter - A high-performance 100% compatible drop-in replacement of "encoding/json"
cel-go - Fast, portable, non-Turing complete expression evaluation with gradual typing (Go)
go-json - Fast JSON encoder/decoder compatible with encoding/json for Go
gval - Expression evaluation in golang
intrinsic
grule-rule-engine - Rule engine implementation in Golang
gojson - Automatically generate Go (golang) struct definitions from example JSON
tengo - A fast script language for Go
hub - A command-line tool that makes git easier to use with GitHub.
mosalat - a rule-engine with custom dsl for golang
ngrok - Unified ingress for developers