SNOW-1708304: Download stream from git repository

src/main/java/net/snowflake/client/jdbc/SnowflakeFileTransferAgent.java

@@ -1649,6 +1649,7 @@ private void uploadStream() throws SnowflakeSQLException {
   /** Download a file from remote, and return an input stream */
   @Override
   public InputStream downloadStream(String fileName) throws SnowflakeSQLException {
+    logger.debug("Downloading file as stream: {}", fileName);
     if (stageInfo.getStageType() == StageInfo.StageType.LOCAL_FS) {
       logger.error("downloadStream function doesn't support local file system", false);
 
@@ -1662,14 +1663,32 @@ public InputStream downloadStream(String fileName) throws SnowflakeSQLException
 
     remoteLocation remoteLocation = extractLocationAndPath(stageInfo.getLocation());
 
-    String stageFilePath = fileName;
+    // when downloading files as stream there should be only one file in source files
+    String sourceLocation =
+        sourceFiles.stream()
+            .findFirst()
+            .orElseThrow(
+                () ->
+                    new SnowflakeSQLException(
+                        queryID,
+                        SqlState.NO_DATA,
+                        ErrorCode.FILE_NOT_FOUND.getMessageCode(),
+                        session,
+                        "File not found: " + fileName));
+
+    if (!fileName.equals(sourceLocation)) {
+      // filename may be different from source location e.g. in git repositories
+      logger.debug("Changing file to download location from {} to {}", fileName, sourceLocation);
+    }
+    String stageFilePath = sourceLocation;
 
     if (!remoteLocation.path.isEmpty()) {
-      stageFilePath = SnowflakeUtil.concatFilePathNames(remoteLocation.path, fileName, "/");
+      stageFilePath = SnowflakeUtil.concatFilePathNames(remoteLocation.path, sourceLocation, "/");
     }
+    logger.debug("Stage file path for {} is {}", sourceLocation, stageFilePath);
 
-    RemoteStoreFileEncryptionMaterial encMat = srcFileToEncMat.get(fileName);
-    String presignedUrl = srcFileToPresignedUrl.get(fileName);
+    RemoteStoreFileEncryptionMaterial encMat = srcFileToEncMat.get(sourceLocation);
+    String presignedUrl = srcFileToPresignedUrl.get(sourceLocation);
 
     return storageFactory
         .createClient(stageInfo, parallel, encMat, session)

src/test/java/net/snowflake/client/jdbc/ConnectionLatestIT.java

@@ -1316,7 +1316,7 @@ public void testDownloadStreamWithFileNotFoundException() throws SQLException {
             .unwrap(SnowflakeConnection.class)
             .downloadStream("@testDownloadStream_stage", "/fileNotExist.gz", true);
       } catch (SQLException ex) {
-        assertThat(ex.getErrorCode(), is(ErrorCode.S3_OPERATION_ERROR.getMessageCode()));
+        assertThat(ex.getErrorCode(), is(ErrorCode.FILE_NOT_FOUND.getMessageCode()));
       }
       long endDownloadTime = System.currentTimeMillis();
       // S3Client retries some exception for a default timeout of 5 minutes

src/test/java/net/snowflake/client/jdbc/GitRepositoryDownloadLatestIT.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2024 Snowflake Computing Inc. All rights reserved.
+ */
+package net.snowflake.client.jdbc;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.List;
+import net.snowflake.client.ConditionalIgnoreRule;
+import net.snowflake.client.RunningOnGithubAction;
+import net.snowflake.client.category.TestCategoryOthers;
+import org.apache.commons.io.IOUtils;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+@Category(TestCategoryOthers.class)
+public class GitRepositoryDownloadLatestIT extends BaseJDBCTest {
+
+  /**
+   * Test needs to set up git integration which is not available in GH Action tests and needs
+   * accountadmin role. Added in > 3.19.0
+   */
+  @Test
+  @ConditionalIgnoreRule.ConditionalIgnore(condition = RunningOnGithubAction.class)
+  public void shouldDownloadFileAndStreamFromGitRepository() throws Exception {
+    try (Connection connection = getConnection()) {
+      prepareJdbcRepoInSnowflake(connection);
+
+      String stageName =
+          String.format("@%s.%s.JDBC", connection.getCatalog(), connection.getSchema());
+      String fileName = ".pre-commit-config.yaml";
+      String filePathInGitRepo = "branches/master/" + fileName;
+
+      List<String> fetchedFileContent =
+          getContentFromFile(connection, stageName, filePathInGitRepo, fileName);
+
+      List<String> fetchedStreamContent =
+          getContentFromStream(connection, stageName, filePathInGitRepo);
+
+      assertFalse("File content cannot be empty", fetchedFileContent.isEmpty());
+      assertFalse("Stream content cannot be empty", fetchedStreamContent.isEmpty());
+      assertEquals(fetchedFileContent, fetchedStreamContent);
+    }
+  }
+
+  private static void prepareJdbcRepoInSnowflake(Connection connection) throws SQLException {
+    try (Statement statement = connection.createStatement()) {
+      statement.execute("use role accountadmin");
+      statement.execute(
+          "CREATE OR REPLACE API INTEGRATION gh_integration\n"
+              + "  API_PROVIDER = git_https_api\n"
+              + "  API_ALLOWED_PREFIXES = ('https://github.com/snowflakedb/snowflake-jdbc.git')\n"
+              + "  ENABLED = TRUE;");
+      statement.execute(
+          "CREATE OR REPLACE GIT REPOSITORY jdbc\n"
+              + "ORIGIN = 'https://github.com/snowflakedb/snowflake-jdbc.git'\n"
+              + "API_INTEGRATION = gh_integration;");
+    }
+  }
+
+  private static List<String> getContentFromFile(
+      Connection connection, String stageName, String filePathInGitRepo, String fileName)
+      throws IOException, SQLException {
+    Path tempDir = Files.createTempDirectory("git");
+    String stagePath = stageName + "/" + filePathInGitRepo;
+    Path downloadedFile = tempDir.resolve(fileName);
+    String command = String.format("GET '%s' '%s'", stagePath, tempDir.toUri());
+
+    try (Statement statement = connection.createStatement();
+        ResultSet rs = statement.executeQuery(command); ) {
+      // then
+      assertTrue("has result", rs.next());
+      return Files.readAllLines(downloadedFile);
+    } finally {
+      Files.delete(downloadedFile);
+      Files.delete(tempDir);
+    }
+  }
+
+  private static List<String> getContentFromStream(
+      Connection connection, String stageName, String filePathInGitRepo)
+      throws SQLException, IOException {
+    SnowflakeConnection unwrap = connection.unwrap(SnowflakeConnection.class);
+    try (InputStream inputStream = unwrap.downloadStream(stageName, filePathInGitRepo, false)) {
+      return IOUtils.readLines(inputStream, StandardCharsets.UTF_8);
+    }
+  }
+}

src/test/java/net/snowflake/client/jdbc/StreamLatestIT.java

@@ -119,7 +119,7 @@ public void testDownloadToStreamBlobNotFoundGCS() throws SQLException {
         assertTrue(ex instanceof SQLException);
         assertTrue(
             "Wrong exception message: " + ex.getMessage(),
-            ex.getMessage().matches(".*Blob.*not found in bucket.*"));
+            ex.getMessage().contains("File not found"));
       } finally {
         statement.execute("rm @~/" + DEST_PREFIX);
       }