feat: avro-sdc

README.md

@@ -24,15 +24,20 @@ pipx install git+https://github.com/MeltanoLabs/tap-file.git
 | protocol                    | True     | None    | The protocol to use to retrieve data. One of `file` or `s3`. |
 | filepath                    | True     | None    | The path to obtain files from. Example: `/foo/bar`. Or, for `protocol==s3`, use `s3-bucket-name` instead. |
 | file_regex                  | False    | None    | A regex pattern to only include certain files. Example: `.*\.csv`. |
-| file_type                   | False    | detect  | Can be any of `csv`, `tsv`, `json`, `avro`, or `detect`. Indicates how to determine a file's type. If set to `detect`, file names containing a matching extension will be read as that type and other files will not be read. If set to a file type, *all* files will be read as that type. |
-| compression                 | False    | detect  | The encoding to use to decompress data. One of `zip`, `bz2`, `gzip`, `lzma`, `xz`, `none`, or `detect`. |
-| delimiter                   | False    | detect  | The character used to separate records in a CSV/TSV. Can be any character or the special value `detect`. If a character is provided, all CSV and TSV files will use that value. `detect` will use `,` for  CSV files and `\t` for TSV files. |
-| quote_character             | False    | "       | The character used to indicate when a record in a CSV contains a delimiter character. |
+| file_type                   | False    | delimited | Can be any of `delimited`, `jsonl`, or `avro`. Indicates the type of file to sync, where `delimited` is for CSV/TSV files and similar. Note that *all* files will be read as that type, regardless of file extension. To only read from files with a matching file extension, appropriately configure `file_regex`. |
+| compression                 | False    | detect  | The encoding to use to decompress data. One of `zip`, `bz2`, `gzip`, `lzma`, `xz`, `none`, or `detect`. If set to `none` or any encoding, that setting will be applied to *all* files, regardless of file extension. If set to `detect`, encodings will be applied based on file extension. |
+| additional_info             | False    |       1 | If `True`, each row in tap's output will have two additional columns: `_sdc_file_name` and `_sdc_line_number`. If `False`, these columns will not be present. |
+| delimited_delimiter         | False    | detect  | The character used to separate records in a delimited file. Can be any character or the special value `detect`. If a character is provided, all delimited files will use that value. `detect` will use `,` for `.csv` files, `\t` for `.tsv` files, and fail if other file types are present. |
+| delimited_quote_character   | False    | "       | The character used to indicate when a record in a delimited file contains a delimiter character. |
+| delimited_header_skip       | False    |       0 | The number of initial rows to skip at the beginning of each delimited file. |
+| delimited_footer_skip       | False    |       0 | The number of initial rows to skip at the end of each delimited file. |
+| delimited_override_headers  | False    | None    | An optional array of headers used to override the default column name in delimited files, allowing for headerless files to be correctly read. |
 | jsonl_sampling_strategy     | False    | first   | The strategy determining how to read the keys in a JSONL file. Must be one of `first` or `all`. Currently, only `first` is supported, which will assume that the first record in a file is representative of all keys. |
-| jsonl_type_coercion_strategy| False    | any     | The strategy determining how to construct the schema for JSONL files when the types represented are ambiguous. Must be one of `any`, `string`, or `blob`. `any` will provide a generic schema for all keys, allowing them to be any valid JSON type. `string` will require all keys to be strings and will convert other values accordingly. `blob` will deliver each JSONL row as a JSON object with no internal schema. Currently, only `any` and `string` are supported. |
+| jsonl_type_coercion_strategy| False    | any     | The strategy determining how to construct the schema for JSONL files when the types represented are ambiguous. Must be one of `any`, `string`, or `envelope`. `any` will provide a generic schema for all keys, allowing them to be any valid JSON type. `string` will require all keys to be strings and will convert other values accordingly. `envelope` will deliver each JSONL row as a JSON object with no internal schema. |
+| avro_type_coercion_strategy | False    | convert | The strategy determining how to construct the schema for Avro files when conversion between schema types is ambiguous. Must be one of `convert` or `envelope`. `convert` will attempt to convert from Avro Schema to JSON Schema and will fail if a type can't be easily coerced. `envelope` will wrap each record in an object without providing an internal schema for the record. |
 | s3_anonymous_connection     | False    |       0 | Whether to use an anonymous S3 connection, without any credentials. Ignored if `protocol!=s3`. |
-| AWS_ACCESS_KEY_ID           | False    | $AWS_ACCESS_KEY_ID | The access key to use when authenticating to S3. Ignored if `protocol!=s3` or `s3_anonymous_connection=True`. Defaults to the value of the environment variable of the same name. |
-| AWS_SECRET_ACCESS_KEY       | False    | $AWS_SECRET_ACCESS_KEY | The access key secret to use when authenticating to S3. Ignored if `protocol!=s3` or `s3_anonymous_connection=True`. Defaults to the value of the environment variable of the same name. |
+| AWS_ACCESS_KEY_ID           | False    | $AWS_ACCESS_KEY_ID    | The access key to use when authenticating to S3. Ignored if `protocol!=s3` or `s3_anonymous_connection=True`. Defaults to the value of the environment variable of the same name. |
+| AWS_SECRET_ACCESS_KEY       | False    | $AWS_SECRET_ACCESS_KEY    | The access key secret to use when authenticating to S3. Ignored if `protocol!=s3` or `s3_anonymous_connection=True`. Defaults to the value of the environment variable of the same name. |
 | caching_strategy            | False    | once    | *DEVELOPERS ONLY* The caching method to use when `protocol!=file`. One of `none`, `once`, or `persistent`. `none` does not use caching at all. `once` (the default) will cache all files for the duration of the tap's invocation, then discard them upon completion. `peristent` will allow caches to persist between invocations of the tap, storing them in your OS's temp directory. It is recommended that you do not modify this setting. |
 | stream_maps                 | False    | None    | Config object for stream maps capability. For more information check out [Stream Maps](https://sdk.meltano.com/en/latest/stream_maps.html). |
 | stream_map_config           | False    | None    | User-defined config values to be used within map expressions. |

meltano.yml

@@ -22,10 +22,19 @@ plugins:
     - name: file_regex
     - name: file_type
     - name: compression
-    - name: delimiter
-    - name: quote_character
+    - name: additional_info
+      kind: boolean
+    - name: delimited_delimiter
+    - name: delimited_quote_character
+    - name: delimited_header_skip
+      kind: integer
+    - name: delimited_footer_skip
+      kind: integer
+    - name: delimited_override_headers
+      kind: array
     - name: jsonl_sampling_strategy
     - name: jsonl_type_coercion_strategy
+    - name: avro_type_coercion_strategy
     - name: s3_anonymous_connection
     - name: AWS_ACCESS_KEY_ID
       kind: password

pyproject.toml

@@ -16,6 +16,7 @@ singer-sdk = { version="^0.28.0" }
 fsspec = "^2023.5.0"
 s3fs = { version = "^2023.5.0", optional = true}
 fs-s3fs = { version = "^1.1.1", optional = true}
+avro = "^1.1.11"
 
 [tool.poetry.extras]
 s3=["s3fs", "fs-s3fs"]

tap_file/client.py

@@ -30,6 +30,38 @@ def filesystem(self) -> fsspec.AbstractFileSystem:
         """
         return FilesystemManager(self.config, self.logger).get_filesystem()
 
+    @cached_property
+    def schema(self) -> dict:
+        """Orchestrates schema creation for all streams.
+
+        Returns:
+            A schema constructed using the get_properties() method of whichever stream
+            is currently in use.
+        """
+        properties = self.get_properties()
+        additional_info = self.config["additional_info"]
+        if additional_info:
+            properties.update({"_sdc_file_name": {"type": ["string"]}})
+            properties.update({"_sdc_line_number": {"type": ["integer"]}})
+        return {"properties": properties}
+
+    def add_additional_info(self, row: dict, file_name: str, line_number: int) -> dict:
+        """Adds _sdc-prefixed additional columns to a row, dependent on config.
+
+        Args:
+            row: The row to add info to.
+            file_name: The name of the file that the row came from.
+            line_number: The line number of the row within its file.
+
+        Returns:
+            A dictionary representing a row containing additional information columns.
+        """
+        additional_info = self.config["additional_info"]
+        if additional_info:
+            row.update({"_sdc_file_name": file_name})
+            row.update({"_sdc_line_number": line_number})
+        return row
+
     def get_files(self) -> Generator[str, None, None]:
         """Gets file names to be synced.
 
@@ -72,6 +104,18 @@ def get_rows(self) -> Generator[dict[str | Any, str | Any], None, None]:
         msg = "get_rows must be implemented by subclass."
         raise NotImplementedError(msg)
 
+    def get_properties(self) -> dict:
+        """Gets properties for the purpose of schema generation.
+
+        Raises:
+            NotImplementedError: This must be implemented by a subclass.
+
+        Returns:
+            A dictionary representing a series of properties for schema generation.
+        """
+        msg = "get_properties must be implemented by subclass."
+        raise NotImplementedError(msg)
+
     def get_compression(self, file: str) -> str | None:  # noqa: PLR0911
         """Determines what compression encoding is appropraite for a given file.