feat: add grpc impl (#50)

* feat: add grpc impl

* feat: add grpc server

* some ut

* verson format: a.b

* code style

* admin request/response

* by cr

* admin api

* by cr

* chore: by cr

* chore: by cr

src/api/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "api"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+prost = "0.10"
+tonic = "0.7"
+
+[build-dependencies]
+tonic-build = "0.7"

src/api/build.rs

@@ -0,0 +1,5 @@
+fn main() {
+    tonic_build::configure()
+        .compile(&["greptime/v1/greptime.proto"], &["."])
+        .expect("compile proto");
+}

src/api/greptime/v1/admin.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package greptime.v1;
+
+// TODO(jiachun)
+message AdminRequest {}
+
+// TODO(jiachun)
+message AdminResponse {}

src/api/greptime/v1/database.proto

@@ -0,0 +1,52 @@
+syntax = "proto3";
+
+package greptime.v1;
+
+message DatabaseRequest {
+    string name = 1;
+    repeated ObjectExpr exprs = 2;
+}
+
+message DatabaseResponse {
+    repeated ObjectResult results = 1;
+}
+
+message ObjectExpr {
+    ExprHeader header = 1;
+    InsertExpr insert = 2;
+    SelectExpr select = 3;
+    UpdateExpr update = 4;
+    DeleteExpr delete = 5;
+}
+
+message SelectExpr {
+    string select = 1; // sql, promql, etc.
+}
+
+message InsertExpr {
+    string table_name = 1;
+    repeated bytes values = 2;
+}
+
+// TODO(jiachun)
+message UpdateExpr {}
+// TODO(jiachun)
+message DeleteExpr {}
+
+message ObjectResult {
+    ResultHeader header = 1;
+    string schema = 2;
+    repeated bytes results = 3;
+}
+
+message ExprHeader {
+    uint32 version = 1;
+}
+
+message ResultHeader {
+    uint32 version = 1;
+    uint32 success = 2;
+    uint32 failure = 3;
+    uint32 code = 4;
+    string err_msg = 5;
+}

src/api/greptime/v1/greptime.proto

@@ -0,0 +1,20 @@
+syntax = "proto3";
+
+package greptime.v1;
+
+import "greptime/v1/admin.proto";
+import "greptime/v1/database.proto";
+
+service Greptime {
+    rpc Batch(BatchRequest) returns (BatchResponse) {}
+}
+
+message BatchRequest {
+    repeated AdminRequest admins = 1;
+    repeated DatabaseRequest databases = 2;
+}
+
+message BatchResponse {
+    repeated AdminResponse admins = 1;
+    repeated DatabaseResponse databases = 2;
+}

src/api/src/lib.rs

@@ -0,0 +1 @@
+pub mod v1;

src/api/src/v1.rs

@@ -0,0 +1 @@
+tonic::include_proto!("greptime.v1");