add zstd compression for .har (#4420)

pyproject.toml

@@ -68,6 +68,7 @@ dependencies = [
     "jsonschema>=4.25.1",
     "python-calamine>=0.6.1",
     "urllib3>=2.6.0",
+    "zstandard>=0.25.0",
 ]
 
 [dependency-groups]

skyvern/forge/sdk/api/aws.py

@@ -16,6 +16,7 @@ from skyvern.config import settings
 # Register custom mime types for mimetypes guessing
 add_type("application/json", ".har")
 add_type("text/plain", ".log")
+add_type("application/zstd", ".zst")
 
 LOG = structlog.get_logger()
 
@@ -27,7 +28,6 @@ class S3StorageClass(StrEnum):
     # INTELLIGENT_TIERING = "INTELLIGENT_TIERING"
     ONEZONE_IA = "ONEZONE_IA"
     GLACIER = "GLACIER"
-    GLACIER_IR = "GLACIER_IR"  # Glacier Instant Retrieval
     # DEEP_ARCHIVE = "DEEP_ARCHIVE"
     # OUTPOSTS = "OUTPOSTS"
     # STANDARD_IA = "STANDARD_IA"

skyvern/forge/sdk/api/real_azure.py

@@ -23,6 +23,7 @@ from skyvern.forge.sdk.schemas.organizations import AzureClientSecretCredential
 # Register custom mime types for mimetypes guessing
 add_type("application/json", ".har")
 add_type("text/plain", ".log")
+add_type("application/zstd", ".zst")
 
 LOG = structlog.get_logger()
 

skyvern/forge/sdk/artifact/storage/s3.py

@@ -5,6 +5,7 @@ from datetime import datetime, timezone
 from typing import BinaryIO
 
 import structlog
+import zstandard as zstd
 
 from skyvern.config import settings
 from skyvern.constants import BROWSER_DOWNLOADING_SUFFIX, DOWNLOAD_FILE_PREFIX
@@ -101,26 +102,42 @@ class S3Storage(BaseStorage):
         return f"{self._build_base_uri(organization_id)}/scripts/{script_id}/{script_version}/{file_path}"
 
     async def store_artifact(self, artifact: Artifact, data: bytes) -> None:
-        sc = await self._get_storage_class_for_org(artifact.organization_id, self.bucket)
+        # We compress HAR files with zstd level 3 to reduce storage size.
+        # HARs are easily compressible because they are mostly JSON.
+        # Other artifacts are not compressed because they are not easily compressible.
+        uri = artifact.uri
+        if artifact.artifact_type == ArtifactType.HAR:
+            cctx = zstd.ZstdCompressor(level=3)
+            data = cctx.compress(data)
+            file_ext = FILE_EXTENTSION_MAP[artifact.artifact_type]
+            uri = uri.replace(f".{file_ext}", f".{file_ext}.zst")
+            artifact.uri = uri
+
+        sc = await self._get_storage_class_for_org(artifact.organization_id)
         tags = await self._get_tags_for_org(artifact.organization_id)
         LOG.debug(
             "Storing artifact",
             artifact_id=artifact.artifact_id,
             organization_id=artifact.organization_id,
-            uri=artifact.uri,
+            uri=uri,
             storage_class=sc,
             tags=tags,
         )
-        await self.async_client.upload_file(artifact.uri, data, storage_class=sc, tags=tags)
+        await self.async_client.upload_file(uri, data, storage_class=sc, tags=tags)
 
-    async def _get_storage_class_for_org(self, organization_id: str, bucket: str) -> S3StorageClass:
+    async def _get_storage_class_for_org(self, organization_id: str) -> S3StorageClass:
         return S3StorageClass.STANDARD
 
     async def _get_tags_for_org(self, organization_id: str) -> dict[str, str]:
         return {}
 
     async def retrieve_artifact(self, artifact: Artifact) -> bytes | None:
-        return await self.async_client.download_file(artifact.uri)
+        data = await self.async_client.download_file(artifact.uri)
+        # Decompress zstd-compressed files
+        if data and artifact.uri.endswith(".zst"):
+            dctx = zstd.ZstdDecompressor()
+            data = dctx.decompress(data)
+        return data
 
     async def get_share_link(self, artifact: Artifact) -> str | None:
         share_urls = await self.async_client.create_presigned_urls([artifact.uri])
@@ -130,7 +147,7 @@ class S3Storage(BaseStorage):
         return await self.async_client.create_presigned_urls([artifact.uri for artifact in artifacts])
 
     async def store_artifact_from_path(self, artifact: Artifact, path: str) -> None:
-        sc = await self._get_storage_class_for_org(artifact.organization_id, self.bucket)
+        sc = await self._get_storage_class_for_org(artifact.organization_id)
         tags = await self._get_tags_for_org(artifact.organization_id)
         LOG.debug(
             "Storing artifact from path",
@@ -146,7 +163,7 @@ class S3Storage(BaseStorage):
     async def save_streaming_file(self, organization_id: str, file_name: str) -> None:
         from_path = f"{get_skyvern_temp_dir()}/{organization_id}/{file_name}"
         to_path = f"s3://{settings.AWS_S3_BUCKET_SCREENSHOTS}/{settings.ENV}/{organization_id}/{file_name}"
-        sc = await self._get_storage_class_for_org(organization_id, settings.AWS_S3_BUCKET_SCREENSHOTS)
+        sc = await self._get_storage_class_for_org(organization_id)
         tags = await self._get_tags_for_org(organization_id)
         LOG.debug(
             "Saving streaming file",
@@ -168,7 +185,7 @@ class S3Storage(BaseStorage):
         temp_zip_file = create_named_temporary_file()
         zip_file_path = shutil.make_archive(temp_zip_file.name, "zip", directory)
         browser_session_uri = f"s3://{settings.AWS_S3_BUCKET_BROWSER_SESSIONS}/{settings.ENV}/{organization_id}/{workflow_permanent_id}.zip"
-        sc = await self._get_storage_class_for_org(organization_id, settings.AWS_S3_BUCKET_BROWSER_SESSIONS)
+        sc = await self._get_storage_class_for_org(organization_id)
         tags = await self._get_tags_for_org(organization_id)
         LOG.debug(
             "Storing browser session",
@@ -202,7 +219,7 @@ class S3Storage(BaseStorage):
         profile_uri = (
             f"s3://{settings.AWS_S3_BUCKET_BROWSER_SESSIONS}/{settings.ENV}/{organization_id}/profiles/{profile_id}.zip"
         )
-        sc = await self._get_storage_class_for_org(organization_id, settings.AWS_S3_BUCKET_BROWSER_SESSIONS)
+        sc = await self._get_storage_class_for_org(organization_id)
         tags = await self._get_tags_for_org(organization_id)
         LOG.debug(
             "Storing browser profile",
@@ -354,7 +371,7 @@ class S3Storage(BaseStorage):
     async def save_downloaded_files(self, organization_id: str, run_id: str | None) -> None:
         download_dir = get_download_dir(run_id=run_id)
         files = os.listdir(download_dir)
-        sc = await self._get_storage_class_for_org(organization_id, settings.AWS_S3_BUCKET_UPLOADS)
+        sc = await self._get_storage_class_for_org(organization_id)
         tags = await self._get_tags_for_org(organization_id)
         base_uri = (
             f"s3://{settings.AWS_S3_BUCKET_UPLOADS}/{DOWNLOAD_FILE_PREFIX}/{settings.ENV}/{organization_id}/{run_id}"
@@ -418,7 +435,7 @@ class S3Storage(BaseStorage):
     ) -> tuple[str, str] | None:
         todays_date = datetime.now(tz=timezone.utc).strftime("%Y-%m-%d")
         bucket = settings.AWS_S3_BUCKET_UPLOADS
-        sc = await self._get_storage_class_for_org(organization_id, bucket)
+        sc = await self._get_storage_class_for_org(organization_id)
         tags = await self._get_tags_for_org(organization_id)
         # First try uploading with original filename
         try:
@@ -491,7 +508,7 @@ class S3Storage(BaseStorage):
     ) -> str:
         """Sync a file from local browser session to S3."""
         uri = self._build_browser_session_uri(organization_id, browser_session_id, artifact_type, remote_path, date)
-        sc = await self._get_storage_class_for_org(organization_id, self.bucket)
+        sc = await self._get_storage_class_for_org(organization_id)
         tags = await self._get_tags_for_org(organization_id)
         await self.async_client.upload_file_from_path(uri, local_file_path, storage_class=sc, tags=tags)
         return uri

skyvern/forge/sdk/artifact/storage/test_s3_storage.py

@@ -4,6 +4,7 @@ from typing import Generator
 
 import boto3
 import pytest
+import zstandard as zstd
 from freezegun import freeze_time
 from moto.server import ThreadedMotoServer
 from types_boto3_s3.client import S3Client
@@ -35,7 +36,7 @@ class S3StorageForTests(S3Storage):
     async def _get_tags_for_org(self, organization_id: str) -> dict[str, str]:
         return {"dummy": f"org-{organization_id}", "test": "jerry"}
 
-    async def _get_storage_class_for_org(self, organization_id: str, bucket: str) -> S3StorageClass:
+    async def _get_storage_class_for_org(self, organization_id: str) -> S3StorageClass:
         return S3StorageClass.ONEZONE_IA
 
 
@@ -447,3 +448,106 @@ class TestS3StorageContentType:
         s3uri = S3Uri(uri)
         obj_meta = boto3_test_client.head_object(Bucket=TEST_BUCKET, Key=s3uri.key)
         assert obj_meta["ContentType"] == expected_content_type
+
+
+@pytest.mark.asyncio
+class TestS3StorageHARCompression:
+    """Test S3Storage HAR file compression with zstd."""
+
+    def _create_har_artifact(self, s3_storage: S3Storage, step_id: str) -> Artifact:
+        """Helper method to create a HAR Artifact."""
+        artifact_id_val = generate_artifact_id()
+        step = create_fake_step(step_id)
+        uri = s3_storage.build_uri(
+            organization_id=TEST_ORGANIZATION_ID,
+            artifact_id=artifact_id_val,
+            step=step,
+            artifact_type=ArtifactType.HAR,
+        )
+        return Artifact(
+            artifact_id=artifact_id_val,
+            artifact_type=ArtifactType.HAR,
+            uri=uri,
+            organization_id=TEST_ORGANIZATION_ID,
+            step_id=step.step_id,
+            task_id=step.task_id,
+            created_at=datetime.utcnow(),
+            modified_at=datetime.utcnow(),
+        )
+
+    async def test_store_har_artifact_compresses_with_zstd(
+        self, s3_storage: S3Storage, boto3_test_client: S3Client
+    ) -> None:
+        """Test that HAR artifacts are compressed with zstd and URI is updated."""
+
+        # Create sample HAR JSON data (easily compressible)
+        har_data = b'{"log": {"version": "1.2", "entries": [{"request": {}, "response": {}}]}}'
+        artifact = self._create_har_artifact(s3_storage, TEST_STEP_ID)
+        original_uri = artifact.uri
+
+        # Store the artifact
+        await s3_storage.store_artifact(artifact, har_data)
+
+        # Verify URI was updated to .har.zst
+        assert artifact.uri.endswith(".har.zst")
+        assert artifact.uri == original_uri.replace(".har", ".har.zst")
+
+        # Verify the stored data is compressed
+        s3uri = S3Uri(artifact.uri)
+        obj_response = boto3_test_client.get_object(Bucket=TEST_BUCKET, Key=s3uri.key)
+        stored_data = obj_response["Body"].read()
+
+        # Stored data should be different from original (compressed)
+        assert stored_data != har_data
+
+        # Verify we can decompress it back to original
+        dctx = zstd.ZstdDecompressor()
+        decompressed = dctx.decompress(stored_data)
+        assert decompressed == har_data
+
+    async def test_retrieve_har_artifact_decompresses_zstd(
+        self, s3_storage: S3Storage, boto3_test_client: S3Client
+    ) -> None:
+        """Test that retrieving a .zst HAR artifact auto-decompresses it."""
+        # Create and store HAR artifact
+        har_data = b'{"log": {"version": "1.2", "creator": {"name": "test"}}}'
+        artifact = self._create_har_artifact(s3_storage, TEST_STEP_ID)
+
+        await s3_storage.store_artifact(artifact, har_data)
+
+        # Retrieve should auto-decompress
+        retrieved_data = await s3_storage.retrieve_artifact(artifact)
+        assert retrieved_data == har_data
+
+    async def test_non_har_artifact_not_compressed(self, s3_storage: S3Storage, boto3_test_client: S3Client) -> None:
+        """Test that non-HAR artifacts are NOT compressed."""
+        test_data = b"fake screenshot data"
+        artifact_id_val = generate_artifact_id()
+        step = create_fake_step(TEST_STEP_ID)
+        uri = s3_storage.build_uri(
+            organization_id=TEST_ORGANIZATION_ID,
+            artifact_id=artifact_id_val,
+            step=step,
+            artifact_type=ArtifactType.SCREENSHOT_LLM,
+        )
+        artifact = Artifact(
+            artifact_id=artifact_id_val,
+            artifact_type=ArtifactType.SCREENSHOT_LLM,
+            uri=uri,
+            organization_id=TEST_ORGANIZATION_ID,
+            step_id=step.step_id,
+            task_id=step.task_id,
+            created_at=datetime.utcnow(),
+            modified_at=datetime.utcnow(),
+        )
+
+        await s3_storage.store_artifact(artifact, test_data)
+
+        # URI should NOT have .zst extension
+        assert not artifact.uri.endswith(".zst")
+
+        # Stored data should be identical to original
+        s3uri = S3Uri(artifact.uri)
+        obj_response = boto3_test_client.get_object(Bucket=TEST_BUCKET, Key=s3uri.key)
+        stored_data = obj_response["Body"].read()
+        assert stored_data == test_data

uv.lock

@@ -1,5 +1,5 @@
 version = 1
-revision = 3
+revision = 2
 requires-python = ">=3.11, <3.14"
 resolution-markers = [
     "python_full_version >= '3.13'",
@@ -5146,6 +5146,7 @@ dependencies = [
     { name = "urllib3" },
     { name = "uvicorn", extra = ["standard"] },
     { name = "websockets" },
+    { name = "zstandard" },
 ]
 
 [package.dev-dependencies]
@@ -5244,6 +5245,7 @@ requires-dist = [
     { name = "urllib3", specifier = ">=2.6.0" },
     { name = "uvicorn", extras = ["standard"], specifier = ">=0.24.0.post1,<0.25" },
     { name = "websockets", specifier = "~=12.0" },
+    { name = "zstandard", specifier = ">=0.25.0" },
 ]
 
 [package.metadata.requires-dev]
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 ]
+
+[[package]]
+name = "zstandard"
+version = "0.25.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/fd/aa/3e0508d5a5dd96529cdc5a97011299056e14c6505b678fd58938792794b1/zstandard-0.25.0.tar.gz", hash = "sha256:7713e1179d162cf5c7906da876ec2ccb9c3a9dcbdffef0cc7f70c3667a205f0b", size = 711513, upload-time = "2025-09-14T22:15:54.002Z" }
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