Upgraded protobuf to support cross crate imports. (#24)

Upgraded protobuf to support cross crate imports.
We need it to allow defining protos in zksync-era as well.
Proto packages share a single common namespace, so I prefixed our
packages with zksync.<crate name>.
I couldn't name the crate "protobuf", because cargo deny has mistaken it
for the public crate with the same name. I've named it
"zksync_protobuf", to be consistent with zksync-era repo.

CI protobuf compatibility check is now more complex, because we need to
collect the descriptors from the cargo build artifacts. Currently it is
implemented as a bash command, but can be upgraded to a proper github
action in the future.

---------

Co-authored-by: Bruno França <[email protected]>

.github/workflows/protobuf.yaml

@@ -14,24 +14,46 @@ on:
     branches: ["main"]
 
 env:
-  PROTOS_DIR: "node/libs/schema/proto"
+  CARGO_TERM_COLOR: always
+  CARGO_INCREMENTAL: "0"
+  RUSTFLAGS: "-Dwarnings -C linker=clang -C link-arg=-fuse-ld=lld -C link-arg=-Wl,-z,nostart-stop-gc"
+  RUSTC_WRAPPER: "sccache"
+  SCCACHE_GHA_ENABLED: "true"
+  RUST_BACKTRACE: "1"
 
 jobs:
   compatibility:
     runs-on: ubuntu-latest
     steps:
       # github.base_ref -> github.head_ref for pull_request
       # github.event.before -> github.event.after for push
+      - uses: mozilla-actions/[email protected]
       - uses: actions/checkout@v3
         with:
           ref: ${{ github.base_ref || github.event.before }}
           path: before
+      - name: compile before
+        run: cargo build --all-targets
+        working-directory: ./before/node
+      - name: build before.binpb
+        run: >
+          perl -ne 'print "$1\n" if /PROTOBUF_DESCRIPTOR="(.*)"/'
+          `find ./before/node/target/debug/build/*/output`
+          | xargs cat > ./before.binpb
       - uses: actions/checkout@v3
         with:
           ref: ${{ github.head_ref || github.event.after }}
           path: after
+      - name: compile after
+        run: cargo build --all-targets
+        working-directory: ./after/node
+      - name: build after.binpb
+        run: >
+          perl -ne 'print "$1\n" if /PROTOBUF_DESCRIPTOR="(.*)"/'
+          `find ./after/node/target/debug/build/*/output`
+          | xargs cat > ./after.binpb
       - uses: bufbuild/buf-setup-action@v1
       - uses: bufbuild/buf-breaking-action@v1
         with:
-          input: "after/$PROTOS_DIR"
-          against: "before/$PROTOS_DIR"
+          input: "./after.binpb"
+          against: "./before.binpb"

.github/workflows/protobuf_conformance.yaml

@@ -28,7 +28,7 @@ jobs:
           path: "protobuf"
       - uses: mozilla-actions/[email protected]
       - name: build test
-        run: cargo build -p zksync_consensus_schema --bin conformance_test
+        run: cargo build -p zksync_protobuf --bin conformance_test
         working-directory: "this/node"
       - name: Cache Bazel
         uses: actions/cache@v3
@@ -41,6 +41,6 @@ jobs:
       - name: run test
         run: >
           bazel run //conformance:conformance_test_runner --
-          --failure_list "${{ github.workspace }}/this/node/libs/schema/src/bin/conformance_test_failure_list.txt"
+          --failure_list "${{ github.workspace }}/this/node/libs/protobuf/src/bin/conformance_test/failure_list.txt"
           "${{ github.workspace }}/this/node/target/debug/conformance_test"
         working-directory: "protobuf"