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https://github.com/obi1kenobi/trustfall

A query engine for any combination of data sources. Query your files and APIs as if they were databases!
https://github.com/obi1kenobi/trustfall

javascript python query-language rust wasm

Last synced: 6 days ago
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A query engine for any combination of data sources. Query your files and APIs as if they were databases!

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README 

        
# Trustfall — Engine for Querying (Almost) Everything



Trustfall is a query engine for querying any kind of data source, from APIs and databases

to any kind of files on disk — and even AI models.



* [Try Trustfall in your browser](#try-trustfall-in-your-browser)

* [10min tech talk + demo](#10min-tech-talk--demo)

* [Examples of querying real-world data with Trustfall](#examples-of-querying-real-world-data-with-trustfall)



## Try Trustfall in your browser



The Trustfall Playground supports running queries against public data sources such as:

- the HackerNews REST APIs: https://play.predr.ag/hackernews

- the rustdoc JSON of top Rust crates: https://play.predr.ag/rustdoc



For example,

[this link](https://play.predr.ag/hackernews#?f=1&q=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%2BPSIsIHZhbHVlOiBbIiRtaW5Qcm9maWxlcyJdKQogICAgICAgICAgICB7CiAgICAgICAgICAgICAgY29tbWVudGVySURzOiB1cmwgQGZpbHRlcihvcDogInJlZ2V4IiwgdmFsdWU6IFsiJHNvY2lhbFBhdHRlcm4iXSkKICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBAb3V0cHV0CiAgICAgICAgICAgIH0KICAgICAgICAgIH0KICAgICAgICB9CiAgICAgIH0KICAgIH0KICB9Cn0%3D&v=ewogICJzaXRlUGF0dGVybiI6ICJodHRwW3NdOi8vKFteLl0qXFwuKSpvcGVuYWkuY29tLy4qIiwKICAibWluUHJvZmlsZXMiOiAxLAogICJzb2NpYWxQYXR0ZXJuIjogIihnaXRodWJ8dHdpdHRlcilcXC5jb20vIgp9)

shows the results of the HackerNews query: "Which GitHub or Twitter

users are commenting on stories about OpenAI?"



In the Playground, Trustfall is configured to run client-side as WASM, performing

all aspects of query processing (parsing, compilation, and execution) within the browser.

While this demo highlights Trustfall's ability to be embedded within a target application,

it is of course able to be used in a more traditional client-server context as well.



## 10min tech talk + demo



Trustfall was featured in the ["How to Query (Almost) Everything" talk](https://www.hytradboi.com/2022/how-to-query-almost-everything)

talk at the [HYTRADBOI 2022](https://www.hytradboi.com/) conference.



![Terminal recording of running `cargo run --release -- query example_queries/actions_in_repos_with_min_10_hn_pts.ron` in the `demo-hytradboi` demo project. The system returns the first 20 results of the query in 6.36 seconds."](./demo-hytradboi/query-demo.gif)



*Demo from the talk showing the execution of the cross-API query: "Which GitHub Actions are used in projects on the front page of HackerNews with >=10 points?"*



The demo executes the following query across the HackerNews and GitHub APIs and over the YAML-formatted GitHub repository workflow files:

```graphql

{

  HackerNewsTop(max: 200) {

    ... on HackerNewsStory {

      hn_score: score @filter(op: ">=", value: ["$min_score"]) @output



      link {

        ... on GitHubRepository {

          repo_url: url @output



          workflows {

            workflow: name @output

            workflow_path: path @output



            jobs {

              job: name @output



              step {

                ... on GitHubActionsImportedStep {

                  step: name @output

                  action: uses @output

                }

              }

            }

          }

        }

      }

    }

  }

}

```



Instructions for

running the demo are available together with the source code in the

`demo-hytradboi` directory: [link](./demo-hytradboi).



## Examples of querying real-world data with Trustfall



- [HackerNews APIs](./trustfall/examples/hackernews/), including an overview of the query language

  and an example of querying REST APIs.

- [RSS/Atom feeds](./trustfall/examples/feeds/), showing how to query structured data

  like RSS/Atom feeds.

- [airport weather data (METAR)](./trustfall/examples/weather), showing how to query CSV data from

  aviation weather reports.



Trustfall also powers the [`cargo-semver-checks`](https://crates.io/crates/cargo-semver-checks)

semantic versioning linter.

More details on the role Trustfall plays in that use case are available in

[this blog post](https://predr.ag/blog/speeding-up-rust-semver-checking-by-over-2000x/).



## Using Trustfall over a new data source



The easiest way to plug in a new data source is by implementing

[the `BasicAdapter` trait](https://docs.rs/trustfall_core/latest/trustfall_core/interpreter/basic_adapter/trait.BasicAdapter.html).



Python bindings are available, and are built automatically on every change to

the engine; the most recent version may be downloaded

[here](https://github.com/obi1kenobi/trustfall/releases). A getting started

guide for Python is forthcoming ([tracking

issue](https://github.com/obi1kenobi/trustfall/issues/16)); in the meantime, the

best resource is the Python bindings' [test suite](./pytrustfall/trustfall/tests/test_execution.py).



## Directory Registry



- [`trustfall`](./trustfall/) is a façade crate. This is the preferred way to use Trustfall.

- [`trustfall_core`](./trustfall_core/) contains the query engine internals

- [`trustfall_derive`](./trustfall_derive/) defines macros that simplify plugging in data sources.

- [`pytrustfall`](./pytrustfall/) contains Trustfall's Python bindings

- [`trustfall_wasm`](./trustfall_wasm/) is a WASM build of Trustfall

- [`trustfall_filetests_macros`](./trustfall_filetests_macros/) is a procedural

  macro used to generate test cases defined by files: they ensure that the

  function under test, when given an input specified by one file, produces an

  output equivalent to the contents of another file.

- [`experiments`](./experiments/) contains various experimental projects

  such as the [Trustfall web playground](https://play.predr.ag/).



Copyright 2022-present Predrag Gruevski.



Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at

[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0)



Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.



The present date is determined by the timestamp of the most recent commit in the repository.

By accessing, and contributing code, comments, or issues to this repository,

you are agreeing that all your contributions may be used, modified, copied, and/or redistributed

under any terms chosen by the original author and/or future maintainers of this project.