Merge pull request #111 from ClarkSource/get-values

feat: allow printing merged value set

k8t/cli.py

@@ -21,7 +21,7 @@
 from k8t.engine import build
 from k8t.templates import YamlValidationError, analyze, render, validate
 from k8t.util import (MERGE_METHODS, deep_merge, envvalues, load_cli_value,
-                      load_yaml)
+                      load_yaml, to_json, to_yaml)
 
 
 def requires_project_directory(func):
@@ -255,6 +255,30 @@ def get_templates(directory, cname, ename):  # pylint: disable=redefined-outer-n
         click.echo(template_path)
 
 
+@get.command(name="values", help="Get final value set.")
+@click.option("-m", "--method", type=click.Choice(MERGE_METHODS), default="ltr", show_default=True, help="Value file merge method.")
+@click.option("--value-file", "value_files", multiple=True, type=click.Path(dir_okay=False, exists=True), help="Additional value file to include.")
+@click.option("--value", "cli_values", type=(str, str), multiple=True, metavar="KEY VALUE", help="Additional value(s) to include.")
+@click.option("--cluster", "-c", "cname", metavar="NAME", help="Cluster context to use.")
+@click.option("--environment", "-e", "ename", metavar="NAME", help="Deployment environment to use.")
+@click.option("--output-format", "-o", type=click.Choice(["json", "yaml"]), default="json", help="Specify output format for values.")
+@click.argument("directory", type=click.Path(exists=True, file_okay=False), default=os.getcwd())
+@requires_project_directory
+def get_values(directory, method, value_files, cli_values, cname, ename, output_format):  # pylint: disable=redefined-outer-name
+    vals = deep_merge(  # pylint: disable=redefined-outer-name
+        values.load_all(directory, cname, ename, method),
+        *(load_yaml(p) for p in value_files),
+        dict(load_cli_value(k, v) for k, v in cli_values),
+        envvalues(),
+        method=method,
+    )
+
+    if output_format == "json":
+        print(to_json(vals))
+    else:
+        print(to_yaml(vals))
+
+
 @root.group(help="Edit local project files.")
 def edit():
     pass

k8t/templates.py

@@ -10,7 +10,7 @@
 import logging
 from typing import Set, Tuple
 
-import yaml  # pylint: disable=E0401
+from ruamel.yaml import YAML  # pylint: disable=E0401
 from jinja2 import Environment, meta, nodes  # pylint: disable=E0401
 
 from k8t import config
@@ -109,8 +109,10 @@ def get_variables(ast, engine: Environment) -> Set[str]:
 def render(template_path: str, values: dict, engine: Environment) -> str:
     output = engine.get_template(template_path).render(values)
 
+    yaml = YAML(typ='safe', pure=True)
+
     try:
-        yaml.safe_load_all(output)
+        yaml.load_all(output)
     except (yaml.scanner.ScannerError, yaml.parser.ParserError) as err:
         raise YamlValidationError(err) from err
 

k8t/util.py

@@ -15,7 +15,7 @@
 from functools import reduce
 from typing import Any, Dict, List, Tuple
 
-import yaml  # pylint: disable=E0401
+from ruamel.yaml import YAML # pylint: disable=E0401
 from click import secho  # pylint: disable=E0401
 
 from simple_tools.interaction import confirm  # pylint: disable=E0401
@@ -107,7 +107,8 @@ def load_yaml(path: str) -> dict:
     LOGGER.debug("loading values file: %s", path)
 
     with open(path, "r") as stream:
-        return yaml.safe_load(stream) or dict()
+        yaml = YAML(typ='safe', pure=True)
+        return yaml.load(stream) or dict()
 
 
 def load_cli_value(key: str, value: str) -> Tuple[str, Any]:
@@ -119,6 +120,16 @@ def load_cli_value(key: str, value: str) -> Tuple[str, Any]:
         return key, value
 
 
+def to_json(input: dict) -> str:
+    return json.dumps(input)
+
+
+def to_yaml(input: dict) -> str:
+    yaml = YAML()
+    yaml.scalarstring.walk_tree(input)
+    return yaml.round_trip_dump(input, default_flow_style = False, allow_unicode = True, explicit_start=True)
+
+
 def envvalues() -> Dict:
     prefix: str = "K8T_VALUE_"
     values: dict = dict()

setup.cfg

@@ -17,7 +17,7 @@ packages = find:
 include_package_data = True
 install_requires =
   Jinja2
-  PyYAML
+  ruamel.yaml
   boto3
   click
   coloredlogs

tox.ini

@@ -4,10 +4,12 @@ isolated_build = True
 
 [testenv]
 passenv = *
+# including PyYAML since moto forgot it
 deps = pytest
        mock
        boto3
        moto
+       PyYAML
 commands = py.test {posargs}
 #           py.test --doctest-module README.rst