Add FGET command

README.md

@@ -144,6 +144,11 @@ To set a field when an object already exists:
 > fset fleet truck1 speed 90
 ```
 
+To get a field when an object already exists:
+```
+> fget fleet truck1 speed
+```
+
 ## Searching
 
 Tile38 has support to search for objects and points that are within or intersects other objects. All object types can be searched including Polygons, MultiPolygons, GeometryCollections, etc.

core/commands.json

@@ -196,6 +196,26 @@
     "since": "1.0.0",
     "group": "keys"
   },
+  "FGET": {
+    "summary": "Gets the value for the field of an id",
+    "complexity": "O(1)",
+    "arguments": [
+      {
+        "name": "key",
+        "type": "string"
+      },
+      {
+        "name": "id",
+        "type": "string"
+      },
+      {
+        "name": "field",
+        "type": "string"
+      }
+    ],
+    "since": "1.33.0",
+    "group": "keys"
+  },
   "BOUNDS": {
     "summary": "Get the combined bounds of all the objects in a key",
     "complexity": "O(1)",

core/commands_gen.go

@@ -362,6 +362,26 @@ var commandsJSON = `{
     "since": "1.0.0",
     "group": "keys"
   },
+  "FGET": {
+    "summary": "Gets the value for the field of an id",
+    "complexity": "O(1)",
+    "arguments": [
+      {
+        "name": "key",
+        "type": "string"
+      },
+      {
+        "name": "id",
+        "type": "string"
+      },
+      {
+        "name": "field",
+        "type": "string"
+      }
+    ],
+    "since": "1.33.0",
+    "group": "keys"
+  },
   "BOUNDS": {
     "summary": "Get the combined bounds of all the objects in a key",
     "complexity": "O(1)",

internal/server/crud.go

@@ -907,6 +907,46 @@ func (s *Server) cmdFSET(msg *Message) (resp.Value, commandDetails, error) {
 	return res, d, nil
 }
 
+// FGET key id field
+func (s *Server) cmdFGET(msg *Message) (resp.Value, error) {
+	start := time.Now()
+
+	// >> Args
+
+	args := msg.Args
+
+	if len(args) < 4 {
+		return retrerr(errInvalidNumberOfArguments)
+	}
+	key, id, field := args[1], args[2], args[3]
+
+	// >> Operation
+
+	col, _ := s.cols.Get(key)
+	if col == nil {
+		return retrerr(errKeyNotFound)
+	}
+	o := col.Get(id)
+	if o == nil {
+		return retrerr(errIDNotFound)
+	}
+	f := o.Fields().Get(field)
+
+	// >> Response
+
+	var buf bytes.Buffer
+	switch msg.OutputType {
+	case JSON:
+		buf.WriteString(`{"ok":true`)
+		buf.WriteString(`,"value":` + f.Value().JSON())
+		buf.WriteString(`,"elapsed":"` + time.Since(start).String() + "\"}")
+		return resp.StringValue(buf.String()), nil
+	case RESP:
+		return resp.StringValue(f.Value().Data()), nil
+	}
+	return NOMessage, nil
+}
+
 // EXPIRE key id seconds
 func (s *Server) cmdEXPIRE(msg *Message) (resp.Value, commandDetails, error) {
 	start := time.Now()

internal/server/scripts.go

@@ -665,6 +665,8 @@ func (s *Server) commandInScript(msg *Message) (
 		res, err = s.cmdBOUNDS(msg)
 	case "get":
 		res, err = s.cmdGET(msg)
+	case "fget":
+		res, err = s.cmdFGET(msg)
 	case "jget":
 		res, err = s.cmdJget(msg)
 	case "jset":
@@ -735,7 +737,7 @@ func (s *Server) luaTile38AtomicRW(msg *Message) (resp.Value, error) {
 			return resp.NullValue(), errReadOnly
 		}
 	case "get", "keys", "scan", "nearby", "within", "intersects", "hooks", "search",
-		"ttl", "bounds", "server", "info", "type", "jget", "test":
+		"ttl", "bounds", "server", "info", "type", "jget", "fget", "test":
 		// read operations
 		if s.config.followHost() != "" && !s.fcuponce {
 			return resp.NullValue(), errCatchingUp
@@ -788,7 +790,7 @@ func (s *Server) luaTile38AtomicRO(msg *Message) (resp.Value, error) {
 		return resp.NullValue(), errReadOnly
 
 	case "get", "keys", "scan", "nearby", "within", "intersects", "hooks", "search",
-		"ttl", "bounds", "server", "info", "type", "jget", "test":
+		"ttl", "bounds", "server", "info", "type", "jget", "fget", "test":
 		// read operations
 		if s.config.followHost() != "" && !s.fcuponce {
 			return resp.NullValue(), errCatchingUp
@@ -839,7 +841,7 @@ func (s *Server) luaTile38NonAtomic(msg *Message) (resp.Value, error) {
 			return resp.NullValue(), errReadOnly
 		}
 	case "get", "keys", "scan", "nearby", "within", "intersects", "hooks", "search",
-		"ttl", "bounds", "server", "info", "type", "jget", "test":
+		"ttl", "bounds", "server", "info", "type", "jget", "fget", "test":
 		// read operations
 		s.mu.RLock()
 		defer s.mu.RUnlock()

internal/server/server.go

@@ -1024,7 +1024,7 @@ func (s *Server) handleInputCommand(client *Client, msg *Message) error {
 		}
 	case "get", "keys", "scan", "nearby", "within", "intersects", "hooks",
 		"chans", "search", "ttl", "bounds", "server", "info", "type", "jget",
-		"evalro", "evalrosha", "healthz", "role":
+		"evalro", "evalrosha", "healthz", "role", "fget":
 		// read operations
 
 		s.mu.RLock()
@@ -1227,6 +1227,8 @@ func (s *Server) command(msg *Message, client *Client) (
 		res, err = s.cmdBOUNDS(msg)
 	case "get":
 		res, err = s.cmdGET(msg)
+	case "fget":
+		res, err = s.cmdFGET(msg)
 	case "jget":
 		res, err = s.cmdJget(msg)
 	case "jset":

tests/keys_test.go

@@ -19,6 +19,7 @@ func subTestKeys(g *testGroup) {
 	g.regSubTest("RENAMENX", keys_RENAMENX_test)
 	g.regSubTest("EXPIRE", keys_EXPIRE_test)
 	g.regSubTest("FSET", keys_FSET_test)
+	g.regSubTest("FGET", keys_FGET_test)
 	g.regSubTest("GET", keys_GET_test)
 	g.regSubTest("KEYS", keys_KEYS_test)
 	g.regSubTest("PERSIST", keys_PERSIST_test)
@@ -201,6 +202,25 @@ func keys_FSET_test(mc *mockServer) error {
 		Do("FSET", "mykey", "myid", "f2", 0).JSON().OK(),
 	)
 }
+func keys_FGET_test(mc *mockServer) error {
+	return mc.DoBatch(
+		Do("SET", "mykey", "myid", "HASH", "9my5xp7").OK(),
+		Do("GET", "mykey", "myid", "WITHFIELDS", "HASH", 7).Str("[9my5xp7]"),
+		Do("FSET", "mykey", "myid", "f1", 105.6).Str("1"),
+		Do("FGET", "mykey", "myid", "f1").Str("105.6"),
+		Do("FSET", "mykey", "myid", "f1", 1.1, "f2", 2.2).Str("2"),
+		Do("FGET", "mykey", "myid", "f2").Str("2.2"),
+		Do("FGET", "mykey", "myid", "f1").Str("1.1"),
+		Do("FGET", "mykey", "myid", "f1").JSON().Str(`{"ok":true,"value":1.1}`),
+		Do("FSET", "mykey", "myid", "f3", "a").Str("1"),
+		Do("FGET", "mykey", "myid", "f3").Str("a"),
+		Do("FGET", "mykey", "myid", "f4").Str("0"),
+		Do("FGET", "mykey", "myid", "f4").JSON().Str(`{"ok":true,"value":0}`),
+		Do("FGET", "mykey", "myid").Err("wrong number of arguments for 'fget' command"),
+		Do("FGET", "mykey2", "myid", "a", "b").Err("key not found"),
+		Do("FGET", "mykey", "myid2", "a", "b").Err("id not found"),
+	)
+}
 func keys_GET_test(mc *mockServer) error {
 	return mc.DoBatch(
 		Do("SET", "mykey", "myid", "STRING", "value").OK(),