feat: Add kg block

src/writer/blocks/__init__.py

@@ -8,6 +8,7 @@
 from writer.blocks.runworkflow import RunWorkflow
 from writer.blocks.setstate import SetState
 from writer.blocks.writeraddchatmessage import WriterAddChatMessage
+from writer.blocks.writeraddtokg import WriterAddToKG
 from writer.blocks.writerchat import WriterChat
 from writer.blocks.writerclassification import WriterClassification
 from writer.blocks.writercompletion import WriterCompletion
@@ -29,3 +30,4 @@
 AddToStateList.register("workflows_addtostatelist")
 ReturnValue.register("workflows_returnvalue")
 WriterInitChat.register("workflows_writerinitchat")
+WriterAddToKG.register("workflows_writeraddtokg")

src/writer/blocks/writeraddtokg.py

@@ -0,0 +1,81 @@
+from typing import Any
+
+from writer.abstract import register_abstract_template
+from writer.blocks.base_block import WorkflowBlock
+from writer.ss_types import AbstractTemplate, WriterConfigurationError
+
+
+class WriterAddToKG(WorkflowBlock):
+
+    @classmethod
+    def register(cls, type: str):
+        super(WriterAddToKG, cls).register(type)
+        register_abstract_template(type, AbstractTemplate(
+            baseType="workflows_node",
+            writer={
+                "name": "Add to Knowledge Graph",
+                "description": "Adds files to an existing knowledge graph.",
+                "category": "Writer",
+                "fields": {
+                    "graphId": {
+                        "name": "Graph id",
+                        "type": "Text",
+                        "desc": "The id for an existing knowledge graph. It has a UUID format."
+                    },
+                    "files": {
+                        "name": "Files",
+                        "type": "Object",
+                        "default": "[]",
+                        "desc": "A list of files to be uploaded and added to the knowledge graph. You can use files uploaded via the File Input component or specify dictionaries with data, type and name."
+                    },
+                },
+                "outs": {
+                    "success": {
+                        "name": "Success",
+                        "description": "If the execution was successful.",
+                        "style": "success",
+                    },
+                    "error": {
+                        "name": "Error",
+                        "description": "If the function raises an Exception.",
+                        "style": "error",
+                    },
+                },
+            }
+        ))
+
+    def _get_prepared_file(self, raw_file: Any):
+        if not isinstance(raw_file, dict):
+            raise WriterConfigurationError("Files must be dictionaries and contain `data`, `type` and `name` attributes.")
+
+        if "data" not in raw_file or "type" not in raw_file or "name" not in raw_file:
+            raise WriterConfigurationError("A file specified as a dictionary must contain `data`, `type` and `name` attributes.")
+
+        return raw_file
+
+    def run(self):
+        try:
+            import writer.ai
+
+            graph_id = self._get_field("graphId", required=True)
+            raw_files = self._get_field("files", as_json=True)
+            prepared_files = []
+
+            if not isinstance(raw_files, list):
+                raise WriterConfigurationError("Files must be a list.")
+
+            for raw_file in raw_files:
+                prepared_files.append(self._get_prepared_file(raw_file))
+
+            graph = writer.ai.retrieve_graph(graph_id)
+
+            for prepared_file in prepared_files:
+                file = writer.ai.upload_file(prepared_file.get("data"),
+                                             prepared_file.get("type"),
+                                             prepared_file.get("name"))
+                graph.add_file(file)
+
+            self.outcome = "success"
+        except BaseException as e:
+            self.outcome = "error"
+            raise e

src/writer/evaluator.py

@@ -7,6 +7,7 @@
 import writer.core_ui
 from writer.ss_types import (
     InstancePath,
+    WriterConfigurationError,
 )
 
 if TYPE_CHECKING:
@@ -29,46 +30,39 @@ def __init__(self, state: "WriterState", component_tree: "ComponentTree"):
         self.serializer = writer.core.StateSerialiser()
 
     def evaluate_field(self, instance_path: InstancePath, field_key: str, as_json=False, default_field_value="", base_context={}) -> Any:
+        def decode_json(text):
+            try:
+                return json.loads(text)
+            except json.JSONDecodeError as exception:
+                raise WriterConfigurationError("Error decoding JSON. " + str(exception)) from exception
+
         def replacer(matched):
             if matched.string[0] == "\\":  # Escaped @, don't evaluate
                 return matched.string
             expr = matched.group(1).strip()
             expr_value = self.evaluate_expression(expr, instance_path, base_context)
 
-            try:
-                if as_json:
-                    serialized_value = self.serializer.serialise(expr_value)
-                    if not isinstance(serialized_value, str):
-                        serialized_value = json.dumps(serialized_value)
-                    return serialized_value
-                return expr_value
-            except BaseException:
-                raise ValueError(
-                    f"""Couldn't serialize value of type "{ type(expr_value) }" when evaluating field "{ field_key }".""")
+            return expr_value
 
         component_id = instance_path[-1]["componentId"]
         component = self.component_tree.get_component(component_id)
-        if component:
-            field_value = component.content.get(field_key) or default_field_value
-            replaced = None
-            full_match = self.TEMPLATE_REGEX.fullmatch(field_value)
+        if not component:
+            raise ValueError(f'Component with id "{component_id}" not found.')
 
-            if full_match is None:
-                replaced = self.TEMPLATE_REGEX.sub(lambda m: str(replacer(m)), field_value)
-            else:
-                replaced = replacer(full_match)
-
-            if (replaced is not None) and as_json:
-                replaced_as_json = None
-                try:
-                    replaced_as_json = json.loads(replaced)
-                except json.JSONDecodeError:
-                    replaced_as_json = json.loads(default_field_value)
-                return replaced_as_json
-            else:
-                return replaced
+        field_value = component.content.get(field_key) or default_field_value
+        replaced = None
+        full_match = self.TEMPLATE_REGEX.fullmatch(field_value)
+
+        if full_match is None:
+            replaced = self.TEMPLATE_REGEX.sub(lambda m: str(replacer(m)), field_value)
+            if as_json:
+                replaced = decode_json(replaced)
         else:
-            raise ValueError(f"Couldn't acquire a component by ID '{component_id}'")
+            replaced = replacer(full_match)
+            if as_json and isinstance(replaced, str):
+                replaced = decode_json(replaced)
+
+        return replaced
 
 
     def get_context_data(self, instance_path: InstancePath, base_context={}) -> Dict[str, Any]:

src/writer/workflows.py

@@ -1,3 +1,4 @@
+import json
 import time
 from typing import TYPE_CHECKING, Any, Dict, List, Literal, Optional, Tuple, Type
 
@@ -70,6 +71,19 @@ def run_nodes(self, nodes: List[writer.core_ui.Component], execution_environment
             self._generate_run_log(execution, title, "info", return_value)
         return return_value
 
+    def _summarize_data_for_log(self, data):
+        if isinstance(data, list):
+            return [self._summarize_data_for_log(item) for item in data]
+        if isinstance(data, dict):
+            return {k : self._summarize_data_for_log(v) for k, v in data.items()}
+        if isinstance(data, (str, int, float, bool, type(None))):
+            return data
+        try:
+            return json.loads(json.dumps(data))
+        except (TypeError, OverflowError):
+            return f"Can't be displayed in the log. Value of type: {str(type(data))}."
+
+
     def _generate_run_log(self,
                           execution: Dict[str, writer.blocks.base_block.WorkflowBlock],
                           title: str,
@@ -83,9 +97,9 @@ def _generate_run_log(self,
                 "componentId": component_id,
                 "outcome": tool.outcome,
                 "message": tool.message,
-                "result": tool.result,
-                "returnValue": tool.return_value,
-                "executionEnvironment": tool.execution_environment,
+                "result": self._summarize_data_for_log(tool.result),
+                "returnValue": self._summarize_data_for_log(tool.return_value),
+                "executionEnvironment": self._summarize_data_for_log(tool.execution_environment),
                 "executionTimeInSeconds": tool.execution_time_in_seconds 
             })
         msg = "Execution finished."

tests/backend/blocks/test_writeraddtokg.py

@@ -0,0 +1,79 @@
+import pytest
+import writer.ai
+from writer.blocks.writeraddtokg import WriterAddToKG
+from writer.ss_types import WriterConfigurationError
+
+
+class MockFile():
+    pass
+
+class MockGraph():
+
+    def add_file(self, file):
+        assert isinstance(file, MockFile)
+
+def mock_retrieve_graph(graph_id):
+    assert graph_id == "abc123"
+    return MockGraph()
+
+def mock_upload_file(data, type, name):
+    assert data == b"123"
+    assert type == "application/pdf"
+    assert name == "interesting.pdf"
+    return MockFile()
+
+
+def test_add_to_kg(session, runner):
+    writer.ai.retrieve_graph = mock_retrieve_graph
+    writer.ai.upload_file = mock_upload_file
+    session.session_state["my_files"] = [
+        {
+            "data": b"123",
+            "type": "application/pdf",
+            "name": "interesting.pdf"
+        },
+        {
+            "data": b"123",
+            "type": "application/pdf",
+            "name": "interesting.pdf"
+        }
+    ]
+    session.add_fake_component({
+        "graphId": "abc123",
+        "files": "@{my_files}"
+    })
+    block = WriterAddToKG("fake_id", runner, {})
+    block.run()
+    assert block.outcome == "success"
+
+
+def test_add_to_kg_missing_type(session, runner):
+    writer.ai.retrieve_graph = mock_retrieve_graph
+    writer.ai.upload_file = mock_upload_file
+    session.session_state["my_files"] = [
+        {
+            "data": b"123",
+            "name": "interesting.pdf"
+        }
+    ]
+    session.add_fake_component({
+        "graphId": "abc123",
+        "files": "@{my_files}"
+    })
+    block = WriterAddToKG("fake_id", runner, {})
+
+    with pytest.raises(WriterConfigurationError):
+        block.run()
+
+def test_add_to_kg_wrong_type(session, runner):
+    writer.ai.retrieve_graph = mock_retrieve_graph
+    writer.ai.upload_file = mock_upload_file
+    session.session_state["my_files"] = "should be list"
+    session.add_fake_component({
+        "graphId": "abc123",
+        "files": "@{my_files}"
+    })
+    block = WriterAddToKG("fake_id", runner, {})
+
+    with pytest.raises(WriterConfigurationError):
+        block.run()