Add support for creating Iceberg datasets in S3 with Glue Catalog (#11)

* Finalize Glue catalog support for iceberg

README.md

@@ -143,6 +143,16 @@ Install with the `delta` module: `pip install faker-cli[delta]`
 fake -n 10 pyint,user_name,date_this_year -f deltalake -o sample_data
 ```
 
+### Iceberg
+
+And, of course, Iceberg tables!
+
+Currently supported are writing to a Glue or generic SQL catalog.
+
+```bash
+fake -n 10 pyint,user_name,date_this_year -f iceberg -C glue://default.iceberg_sample -o s3://YOUR_BUCKET/iceberg-data/
+```
+
 ## Templates
 
 The libary includes a couple templates that can be used to generate certain types of fake data easier.

faker_cli/cli.py

@@ -25,21 +25,22 @@
 @click.option(
     "--format",
     "-f",
-    type=click.Choice(["csv", "json", "parquet", "deltalake"]),
+    type=click.Choice(["csv", "json", "parquet", "deltalake", "iceberg"]),
     default="csv",
     help="Format of the output",
 )
 @click.option("--output", "-o", type=click.Path(writable=True))
 @click.option("--columns", "-c", help="Column names", default=None, required=False)
 @click.option("--template", "-t", help="Template to use", type=click.Choice(["s3access", "cloudfront"]), default=None)
+@click.option("--catalog", "-C", help="Catalog URI", default=None, required=False)
 @click.argument("column_types", required=False)
 @click.option("--provider", "-p", help="Fake data provider", type=click.Choice(["faker", "mimesis"]), default="faker")
-def main(num_rows, format, output, columns, template, column_types, provider):
+def main(num_rows, format, output, columns, template, catalog, column_types, provider):
     """
     Generate fake data, easily.
 
     COLUMN_TYPES is a comma-seperated list of Faker property names, like
-    pyint,username,date_this_year
+    pyint,user_name,date_this_year
 
     You can also use --template for real-world synthetic data.
     """
@@ -62,10 +63,12 @@ def main(num_rows, format, output, columns, template, column_types, provider):
         raise click.BadArgumentUsage('templates are only supported with the "faker" provider.')
 
     # Parquet output requires a filename
-    if format in ["parquet", "deltalake"] and output is None:
-        raise click.BadArgumentUsage("parquet | deltalake formats requires --output/-o filename parameter.")
-    if output is not None and format not in ["parquet", "deltalake"]:
+    if format in ["parquet", "deltalake", "iceberg"] and output is None:
+        raise click.BadArgumentUsage(f"{format} format requires --output/-o filename parameter.")
+    if output is not None and format not in ["parquet", "deltalake", "iceberg"]:
         raise click.BadArgumentUsage("output files not supported for csv/json yet.")
+    if catalog and format not in ['iceberg']:
+        raise click.BadArgumentUsage("catalog option is only available for Iceberg formats")
 
     # Optionally load additional features
     if format == "parquet":
@@ -90,6 +93,17 @@ def main(num_rows, format, output, columns, template, column_types, provider):
                 "Make sure to install faker-cli using `pip install faker-cli[delta]`."
             )
 
+    if format == "iceberg":
+        try:
+            from faker_cli.writers.iceberg import IcebergWriter
+
+            KLAS_MAPPER["iceberg"] = IcebergWriter
+        except ImportError:
+            raise click.ClickException(
+                "Using Iceberg writer, but the 'iceberg' package is not installed. "
+                "Make sure to install faker-cli using `pip install faker-cli[iceberg]`."
+            )
+
     # If the user provides a template, we use that provider and writer and exit.
     # We assume a template has a custom writer that may be different than CSV or JSON
     if template:
@@ -108,7 +122,8 @@ def main(num_rows, format, output, columns, template, column_types, provider):
     format_klas = KLAS_MAPPER.get(format)
     if format_klas is None:
         raise click.ClickException(f"Format {format} not supported.")
-    writer = format_klas(sys.stdout, headers, output)
+    # Fix in a better way - maybe passing **kwargs?
+    writer = format_klas(sys.stdout, headers, output, catalog)
     for i in range(num_rows):
         writer.write(fake.generate_row(col_types))
     writer.close()

faker_cli/writer.py

@@ -4,7 +4,7 @@
 
 
 class Writer:
-    def __init__(self, output, headers, filename: Optional[str] = None):
+    def __init__(self, output, headers, filename: Optional[str] = None, catalog_uri: Optional[str] = None):
         self.output = output
         self.headers = headers
         self.writer = None
@@ -17,7 +17,7 @@ def close(self):
 
 
 class CSVWriter(Writer):
-    def __init__(self, output, headers, filename):
+    def __init__(self, output, headers, filename, catalog_uri):
         super().__init__(output, headers)
         self.writer = csv.writer(self.output)
         self.write(headers)
@@ -27,7 +27,7 @@ def write(self, row):
 
 
 class JSONWriter(Writer):
-    def __init__(self, output, headers, filename):
+    def __init__(self, output, headers, filename, catalog_uri):
         super().__init__(output, headers)
         self.writer = self.output
 

faker_cli/writers/iceberg.py

@@ -0,0 +1,82 @@
+from tempfile import TemporaryDirectory
+from urllib.parse import urlparse
+
+import click
+import pyarrow as pa
+from pyiceberg.catalog import Catalog
+from pyiceberg.catalog.sql import SqlCatalog
+from pyiceberg.exceptions import NoSuchNamespaceError, NoSuchTableError
+
+from faker_cli.writers.parquet import ParquetWriter
+
+
+class CatalogManager:
+    def __init__(self, uri: str, location: str) -> None:
+        [self.database, self.table] = urlparse(uri).netloc.split(".")
+        self.catalog = self._from_uri(uri, location)
+
+    def _from_uri(self, uri: str, location: str) -> Catalog:
+        u = urlparse(uri)
+        if u.scheme == "glue":
+            try:
+                from pyiceberg.catalog.glue import GlueCatalog
+            except ImportError:
+                raise click.ClickException(
+                    "Using Iceberg writer with Glue catalog, but the 'boto3' package is not installed. "
+                    "Make sure to install faker-cli using `pip install faker-cli[iceberg,glue]`."
+                )
+            glue = GlueCatalog(self.database)
+            try:
+                glue.load_namespace_properties(self.database)
+                glue.load_table(u.netloc)
+                raise Exception("Table already exists, please delete or choose another name.")
+            except NoSuchNamespaceError:
+                glue.create_namespace(self.database)
+            except NoSuchTableError:
+                pass
+
+            return glue
+
+        elif u.scheme == "sqlite":
+            self.temp_path = TemporaryDirectory()
+            sql = SqlCatalog(
+                self.database, uri=f"sqlite:////{self.temp_path.name}/pyiceberg_catalog.db", warehouse=location
+            )
+            sql.create_namespace(self.database)
+            return sql
+        else:
+            raise Exception("Unsupported catalog type, only glue or sqllite are supported.")
+
+    def create_table(self, schema, warehouse_path) -> pa.Table:
+        if self.catalog is SqlCatalog:
+            table = self.catalog.create_table(
+                f"{self.database}.{self.table}",
+                schema=schema,
+            )
+        else:
+            # location required for GlueCatalog
+            table = self.catalog.create_table(
+                f"{self.database}.{self.table}",
+                schema=schema,
+                location=warehouse_path.rstrip("/"),
+            )
+        return table
+
+
+class IcebergWriter(ParquetWriter):
+    def __init__(self, output, headers, filename, catalog_uri):
+        super().__init__(output, headers, filename, catalog_uri)
+        self.warehouse_path = filename
+        self.temp_path = TemporaryDirectory()
+        self.table: pa.Table = None
+        self.catalog: CatalogManager = CatalogManager(catalog_uri, filename)
+
+    def close(self):
+        iceberg_table = self.catalog.create_table(self.table.schema, self.warehouse_path)
+        iceberg_table.overwrite(self.table)
+
+        if self.catalog is SqlCatalog:
+            pa.fs.copy_files(
+                f"{self.temp_path.name}/pyiceberg_catalog.db", f"{self.warehouse_path}pyiceberg_catalog.db"
+            )
+        return super().close()

faker_cli/writers/parquet.py

@@ -5,7 +5,7 @@
 from faker_cli.writer import Writer
 
 class ParquetWriter(Writer):
-    def __init__(self, output, headers, filename):
+    def __init__(self, output, headers, filename, catalog_uri):
         super().__init__(output, headers)
         self.filename = filename
         self.table: pa.Table = None