feat: switch from flatbuffers to protobuf (#15)

.github/workflows/release-please.yml

@@ -19,9 +19,8 @@ jobs:
       - uses: actions/checkout@v2
         if: ${{ steps.release.outputs.release_created }}
 
-      - name: Install flatbuffers
-        uses: ./.github/actions/install-flatbuffers
-        if: ${{ steps.release.outputs.release_created }}
+      - name: Setup protoc
+        uses: arduino/[email protected]
 
       - name: Install stable toolchain
         uses: actions-rs/toolchain@v1
@@ -30,7 +29,7 @@ jobs:
           toolchain: stable
           override: true
 
-      - uses: Swatinem/rust-cache@v1.3.0
+      - uses: Swatinem/rust-cache@v2
         if: ${{ steps.release.outputs.release_created }}
 
       - name: Publish crate

.github/workflows/rust.yml

@@ -22,13 +22,8 @@ jobs:
           override: true
           components: rustfmt
 
-      - name: Install flatbuffers
-        uses: ./.github/actions/install-flatbuffers
-
       - name: Check format
-        run: |
-          flatc -o target/flatbuffers --rust src/world.fbs
-          rustfmt target/flatbuffers/world_generated.rs
+        run:
           cargo fmt -- --check
 
   Linting:
@@ -46,8 +41,8 @@ jobs:
           override: true
           components: clippy
 
-      - name: Install flatbuffers
-        uses: ./.github/actions/install-flatbuffers
+      - name: Setup protoc
+        uses: arduino/[email protected]
 
       - uses: Swatinem/rust-cache@v2
 
@@ -95,8 +90,8 @@ jobs:
           toolchain: stable
           override: true
 
-      - name: Install flatbuffers
-        uses: ./.github/actions/install-flatbuffers
+      - name: Setup protoc
+        uses: arduino/[email protected]
 
       - uses: Swatinem/rust-cache@v2
 

.gitignore

@@ -12,6 +12,6 @@ perf.*
 
 *.lock
 
-## Flatbuffers
+## Protocolbuffers library
 
 utils/var

Cargo.toml

@@ -27,7 +27,6 @@ byte-unit = "4.0.18"
 clap = { version = "4.1.8", features = ["derive"] }
 clap-verbosity-flag = "2.0.0"
 csv = "1.2.0"
-flatbuffers = "23.1.21"
 flate2 = "1.0.25"
 hgvs = "0.6.2"
 lazy_static = "1.4.0"
@@ -60,9 +59,11 @@ jsonl = "4.0.1"
 chrono = "0.4.24"
 rand_core = "0.6.4"
 rand = "0.8.5"
+prost = "0.11.9"
+zstd = "0.12.3"
 
 [build-dependencies]
-flatc-rust = "0.2.0"
+prost-build = "0.11.9"
 
 [dev-dependencies]
 csv = "1.2.0"

README.md

@@ -173,9 +173,9 @@ cargo run --release -- \
 
 ## Development Setup
 
-You will need a recent version of flatbuffers, e.g.:
+You will need a recent version of protoc, e.g.:
 
 ```
-# bash utils/install-flatbuffers.sh
-# export PATH=$PATH:$HOME/.local/share/flatbuffers/bin
+# bash utils/install-protoc.sh
+# export PATH=$PATH:$HOME/.local/share/protoc/bin
 ```

build.rs

@@ -1,13 +1,6 @@
-// The custom build script, needed as we use flatbuffers.
-
-use std::path::Path;
+// The custom build script, needed as we use prost.
 
 fn main() {
-    println!("cargo:rerun-if-changed=src/world.fbs");
-    flatc_rust::run(flatc_rust::Args {
-        inputs: &[Path::new("src/world.fbs")],
-        out_dir: Path::new("target/flatbuffers/"),
-        ..Default::default()
-    })
-    .expect("flatc");
+    println!("cargo:rerun-if-changed=src/db/create/txs/data.proto3");
+    prost_build::compile_protos(&["src/db/create/txs/data.proto3"], &["src/"]).unwrap();
 }

docs/db_build.md

@@ -139,7 +139,7 @@ This will be OK as there will be a more recent version available.
 
 ## Building Transcript Database
 
-You can build the transcript database flatbuffers binary using the following command:
+You can build the transcript database protocolbuffers binary using the following command:
 
 ```text
 $ mehari db create txs \
@@ -158,6 +158,8 @@ $ mehari db create txs \
 You will have to build the transcript database for each genome release that you want and manually specify the release to `--genome-release`.
 For GRCh38, simply use `--genome-release grch38`.
 
+You can enable compression by using the suffix `.gz` for gzip compression and `.zstd` for zstandard compression.
+
 # Building ClinVar Database
 
 This assumes that you have converted a recent ClinVar XML file to TSV using [clinvar-tsv](https://github.com/bihealth/clinvar-tsv).

docs/implementation_notes.md

@@ -19,6 +19,6 @@ See the data structures in [`crate::db::create::seqvar_freqs::serialized`] for t
 
 ## Transcript Databases
 
-* Transcript databases are stored as [Flatbuffers](https://github.com/google/flatbuffers).
+* Transcript databases are stored as [ProtocolBuffers](https://protobuf.dev/).
 * Array-backed interval trees from [rust-bio](https://github.com/rust-bio/rust-bio) are used for fast lookup from chromosomal coordinate to transcript.
 * Transcripts are taken from [cdot](https://github.com/SACGF/cdot).

src/annotate/seqvars/csq.rs

@@ -138,7 +138,10 @@ impl ConsequencePredictor {
 
         // Skip transcripts that are protein coding but do not have a CDS.
         // TODO: do not include such transcripts when building the database.
-        if tx.biotype == TranscriptBiotype::Coding && tx.start_codon.is_none() {
+        if TranscriptBiotype::from_i32(tx.biotype).expect("invalid tx biotype")
+            == TranscriptBiotype::Coding
+            && tx.start_codon.is_none()
+        {
             return Ok(None);
         }
 
@@ -213,16 +216,26 @@ impl ConsequencePredictor {
             if var_start <= exon_start && var_end >= exon_end {
                 consequences.push(Consequence::ExonLossVariant);
                 if var_start < exon_start {
-                    if alignment.strand == Strand::Plus && rank.ord != 1 {
+                    if Strand::from_i32(alignment.strand).expect("invalid strand") == Strand::Plus
+                        && rank.ord != 1
+                    {
                         consequences.push(Consequence::SpliceAcceptorVariant);
-                    } else if alignment.strand == Strand::Minus && rank.ord != rank.total {
+                    } else if Strand::from_i32(alignment.strand).expect("invalid strand")
+                        == Strand::Minus
+                        && rank.ord != rank.total
+                    {
                         consequences.push(Consequence::SpliceDonorVariant);
                     }
                 }
                 if var_end > exon_end {
-                    if alignment.strand == Strand::Plus && rank.ord != rank.total {
+                    if Strand::from_i32(alignment.strand).expect("invalid strand") == Strand::Plus
+                        && rank.ord != rank.total
+                    {
                         consequences.push(Consequence::SpliceDonorVariant);
-                    } else if alignment.strand == Strand::Minus && rank.ord != rank.total {
+                    } else if Strand::from_i32(alignment.strand).expect("invalid strand")
+                        == Strand::Minus
+                        && rank.ord != rank.total
+                    {
                         consequences.push(Consequence::SpliceAcceptorVariant);
                     }
                 }
@@ -236,15 +249,15 @@ impl ConsequencePredictor {
                 // Check the cases where the variant overlaps with the splice acceptor/donor site.
                 if var_start < intron_start + 2 && var_end > intron_start - ins_shift {
                     // Left side, is acceptor/donor depending on transcript's strand.
-                    match alignment.strand {
+                    match Strand::from_i32(alignment.strand).expect("invalid strand") {
                         Strand::Plus => consequences.push(Consequence::SpliceDonorVariant),
                         Strand::Minus => consequences.push(Consequence::SpliceAcceptorVariant),
                     }
                 }
                 // Check the case where the variant overlaps with the splice donor site.
                 if var_start < intron_end + ins_shift && var_end > intron_end - 2 {
                     // Left side, is acceptor/donor depending on transcript's strand.
-                    match alignment.strand {
+                    match Strand::from_i32(alignment.strand).expect("invalid strand") {
                         Strand::Plus => consequences.push(Consequence::SpliceAcceptorVariant),
                         Strand::Minus => consequences.push(Consequence::SpliceDonorVariant),
                     }
@@ -260,7 +273,7 @@ impl ConsequencePredictor {
                     consequences.push(Consequence::SpliceRegionVariant);
                 }
                 if var_start < exon_end && var_end > exon_end - 3 {
-                    if alignment.strand == Strand::Plus {
+                    if Strand::from_i32(alignment.strand).expect("invalid strand") == Strand::Plus {
                         if rank.ord != rank.total {
                             consequences.push(Consequence::SpliceRegionVariant);
                         }
@@ -272,7 +285,7 @@ impl ConsequencePredictor {
                     }
                 }
                 if var_start < exon_start + 3 && var_end > exon_start {
-                    if alignment.strand == Strand::Plus {
+                    if Strand::from_i32(alignment.strand).expect("invalid strand") == Strand::Plus {
                         if rank.ord != 1 {
                             consequences.push(Consequence::SpliceRegionVariant);
                         }
@@ -294,10 +307,11 @@ impl ConsequencePredictor {
         let min_start = min_start.expect("must have seen exon");
         let max_end = max_end.expect("must have seen exon");
 
-        let feature_biotype = match tx.biotype {
-            TranscriptBiotype::Coding => FeatureBiotype::Coding,
-            TranscriptBiotype::NonCoding => FeatureBiotype::Noncoding,
-        };
+        let feature_biotype =
+            match TranscriptBiotype::from_i32(tx.biotype).expect("invalid transcript biotype") {
+                TranscriptBiotype::Coding => FeatureBiotype::Coding,
+                TranscriptBiotype::NonCoding => FeatureBiotype::Noncoding,
+            };
 
         let is_upstream = var_end <= min_start;
         let is_downstream = var_start >= max_end;
@@ -314,7 +328,7 @@ impl ConsequencePredictor {
         } else if is_upstream {
             let val = -(min_start - var_end);
             if val.abs() <= 5_000 {
-                match alignment.strand {
+                match Strand::from_i32(alignment.strand).expect("invalid strand") {
                     Strand::Plus => consequences.push(Consequence::UpstreamGeneVariant),
                     Strand::Minus => consequences.push(Consequence::DownstreamGeneVariant),
                 }
@@ -323,7 +337,7 @@ impl ConsequencePredictor {
         } else if is_downstream {
             let val = var_start - max_end;
             if val.abs() <= 5_000 {
-                match alignment.strand {
+                match Strand::from_i32(alignment.strand).expect("invalid strand") {
                     Strand::Plus => consequences.push(Consequence::DownstreamGeneVariant),
                     Strand::Minus => consequences.push(Consequence::UpstreamGeneVariant),
                 }
@@ -689,7 +703,7 @@ mod test {
     #[test]
     fn annotate_snv_brca1_one_variant() -> Result<(), anyhow::Error> {
         let tx_path = "tests/data/annotate/db/seqvars/grch37/txs.bin";
-        let tx_db = load_tx_db(tx_path, 5_000_000)?;
+        let tx_db = load_tx_db(tx_path)?;
         let provider = Rc::new(MehariProvider::new(tx_db, Assembly::Grch37p10));
 
         let predictor = ConsequencePredictor::new(provider, Assembly::Grch37p10);
@@ -816,7 +830,7 @@ mod test {
 
     fn annotate_vars(path_tsv: &str, txs: &[String]) -> Result<(), anyhow::Error> {
         let tx_path = "tests/data/annotate/db/seqvars/grch37/txs.bin";
-        let tx_db = load_tx_db(tx_path, 5_000_000)?;
+        let tx_db = load_tx_db(tx_path)?;
         let provider = Rc::new(MehariProvider::new(tx_db, Assembly::Grch37p10));
         let predictor = ConsequencePredictor::new(provider, Assembly::Grch37p10);