Initial work

.github/CODEOWNERS

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+* @pavlospt
+* @nikoshet

.github/workflows/ci.yaml

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+name: CI Pipeline
+
+on:
+  push:
+  pull_request:
+    branches:
+      - main
+
+concurrency:
+  group: '${{ github.workflow }} @ ${{ github.head_ref || github.ref }}'
+  cancel-in-progress: true
+
+jobs:
+  build-library:
+    name: build library
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - name: Cargo Build
+        working-directory: "{{ matrix.directory }}"
+        run: |
+          cargo build
+  build-client:
+    name: build client
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - name: Cargo Build
+        working-directory: "rust-pgdatadiff-client"
+        run: |
+          cargo build
+  test:
+    name: cargo test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - run: cargo test --all
+  format:
+    name: cargo fmt && cargo clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          components: rustfmt, clippy
+      - name: Rustfmt Check
+        uses: actions-rust-lang/rustfmt@v1
+      - name: Lint with Clippy
+        run: cargo clippy --all

.gitignore

@@ -12,3 +12,12 @@ Cargo.lock
 
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
+
+
+# Added by cargo
+
+/target
+.idea/
+.DS_Store
+postgres-data1/
+postgres-data2/

Cargo.toml

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+workspace = { members = ["rust-pgdatadiff-client"] }
+[package]
+name = "rust-pgdatadiff"
+version = "0.1.1"
+edition = "2021"
+license = "MIT"
+description = "Rust library for comparing two PostgreSQL databases"
+readme = "README.md"
+homepage = "https://github.com/pavlospt/rust-pgdatadiff"
+repository = "https://github.com/pavlospt/rust-pgdatadiff"
+keywords = ["postgres", "postgresql", "diff"]
+documentation = "https://docs.rs/rust-pgdatadiff"
+
+[dependencies]
+anyhow = "1.0.81"
+tokio = { version = "1.36.0", features = ["full"] }
+sqlx = { version = "0.7", features = ["runtime-tokio", "tls-native-tls", "postgres"] }
+colored = "2.1.0"
+futures = { version = "0.3.30", default-features = true, features = ["async-await"] }
+env_logger = "0.11.3"
+log = "0.4.21"
+async-trait = "0.1.77"
+pretty_assertions = "1.4.0"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
+
+[dependencies.clap]
+version = "4.5.2"
+features = ["derive"]
+
+[dev-dependencies]
+mockall = "0.12.1"
+tokio = { version = "1.36.0", features = ["rt-multi-thread", "macros"] }
+
+[lib]
+test = true
+edition = "2021"
+crate-type = ["lib"]
+name = "rust_pgdatadiff"

README.md

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+# Rust PGDataDiff
+
+`rust-pgdatadiff` is a re-write of the Python version of [pgdatadiff](https://github.com/dmarkey/pgdatadiff)
+
+## What makes it different?
+
+* It is schema aware right from the get-go, as when we had to use the original
+  `pgdatadiff` we ended up having different schemas that we needed to perform checks on.
+
+* It runs DB operations in a parallel fashion,
+  making it at least 3x faster in comparison to the original `pgdatadiff` which performs the checks sequentially.
+
+* It is written in Rust, which means that it is memory safe and has a very low overhead.
+
+* It provides both a library and a client, which means that you can use it as a standalone tool
+  and in your own projects.
+
+### Python (sequential)
+![python-timings](images/python.png)
+
+### Rust (parallel)
+![rust-timings](images/rust.png)
+
+## Installation (Client)
+
+In case you want to use this as a client you can install it through `cargo`:
+
+```shell
+cargo install rust-pgdatadiff-client
+```
+
+## Installation (Library)
+
+In case you want to use this as a library you can add it to your `Cargo.toml`:
+
+```shell
+cargo add rust-pgdatadiff
+```
+
+or
+
+```toml
+[dependencies]
+rust-pgdatadiff = "0.1.0"
+```
+
+## Usage (Client)
+
+```
+Usage: rust-pgdatadiff-client diff [OPTIONS] <FIRST_DB> <SECOND_DB>
+
+Arguments:
+  <FIRST_DB>   postgres://postgres:postgres@localhost:5438/example
+  <SECOND_DB>  postgres://postgres:postgres@localhost:5439/example
+
+Options:
+      --only-data                               Only compare data, exclude sequences
+      --only-sequences                          Only compare sequences, exclude data
+      --only-count                              Do a quick test based on counts alone
+      --chunk-size <CHUNK_SIZE>                 The chunk size when comparing data [default: 10000]
+      --max-connections <MAX_CONNECTIONS>       Max connections for Postgres pool [default: 100]
+  -i, --included-tables [<INCLUDED_TABLES>...]  Tables included in the comparison
+      --schema-name <SCHEMA_NAME>               Schema name [default: public]
+  -h, --help                                    Print help
+  -V, --version                                 Print version
+```
+
+## Usage (Library)
+
+```rust
+use rust_pgdatadiff::diff::diff_ops::Differ;
+use rust_pgdatadiff::diff::diff_payload::DiffPayload;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+  let first_db = "postgres://postgres:postgres@localhost:5438/example";
+  let second_db = "postgres://postgres:postgres@localhost:5439/example";
+
+  let payload = DiffPayload::new(
+    first_db.to_owned(),
+    second_db.to_owned(),
+    *only_data,
+    *only_sequences,
+    *only_count,
+    *chunk_size,
+    *max_connections,
+    included_tables.to_vec(),
+    schema_name.clone(),
+  );
+  let diff_result = Differ::diff_dbs(payload).await;
+  // Handle `diff_result` in any way it fits your use case
+  Ok(())
+}
+```
+
+## Examples
+
+You can spin up two databases already prefilled with data through Docker Compose.
+
+```shell
+docker compose up --build
+```
+
+Prefilled databases include a considerable amount of data + rows, so you can run benchmarks against them to check the
+performance of it. You can modify a few of the generated data in order to see it in action.
+
+You can find an example of using it as a library in the [`examples`](./examples) directory.
+
+Run the example with the following command, after Docker Compose has started:
+
+```shell
+cargo run --example example_diff diff \
+  "postgresql://localhost:5438?dbname=example&user=postgres&password=postgres" \
+  "postgresql://localhost:5439?dbname=example&user=postgres&password=postgres"
+```
+
+You can also enable Rust related logs by exporting the following:
+
+```shell
+export RUST_LOG=rust_pgdatadiff=info
+```
+
+Switching from `info` to `debug` will give you more detailed logs. Also since we are utilizing
+`sqlx` under the hood, you can enable `sqlx` logs by exporting the following:
+
+```shell
+export RUST_LOG=rust_pgdatadiff=info,sqlx=debug
+```
+
+# Authors
+
+* [Pavlos-Petros Tournaris](https://github.com/pavlospt)
+* [Nikolaos Nikitas](https://github.com/nikoshet)