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Update: Kheops core classes

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This commit is contained in:
mrjk 2022-03-10 12:08:12 -05:00
parent 5f80881c3c
commit f12d9fd7be
2 changed files with 204 additions and 251 deletions
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146
kheops/app.py
View File

@ -11,89 +11,50 @@ from pathlib import Path
import anyconfig import anyconfig
from diskcache import Cache from diskcache import Cache
import kheops.plugin as KheopsPlugins
from kheops.controllers import QueryProcessor from kheops.controllers import QueryProcessor
from kheops.utils import schema_validate from kheops.utils import schema_validate
log = logging.getLogger(__name__) log = logging.getLogger(__name__)
CONF_SCHEMA = { CONF_SCHEMA = {
"$schema": "http://json-schema.org/draft-07/schema#", "$schema": "http://json-schema.org/draft-07/schema#",
"type": "object", "type": "object",
"additionalProperties": False, "additionalProperties": False,
"default": {}, "default": {},
"$def": { "required": ["config"],
"backends_items": {}, #"$def": {
"backends_config": {}, # "backends_items": {},
"rules_items": {}, # "backends_config": {},
"rules_config": {}, # "rules_items": {},
}, # "rules_config": {},
# "patternProperties": { #},
# ".*": {
# "type": "object",
# "optional": True,
# "additionalProperties": False,
"properties": { "properties": {
"lookups": {
"type": "array",
"default": [],
"items": {
"type": "object",
#"properties": {"$ref": "#/$defs/backends_items"},
},
},
"rules": {
"type": "array",
"default": [],
# "arrayItem": { "$ref": "#/$defs/rules_items" },
},
"config": { "config": {
"type": "object", "type": "object",
"default": {}, "default": {},
"additionalProperties": True, "additionalProperties": True,
#"required": ["app"],
"properties": { "properties": {
"app": { "app": {
"type": "object", "type": "object",
"default": {}, "default": {},
"additionalProperties": False, "additionalProperties": False,
"properties": {
"root": {
"default": None,
"oneOf": [
{
"type": "null",
"description": "Application current working directory is the `kheops.yml` directory",
},
{
"type": "string",
"description": "Application working directory. If a relative path is used, it will be depending on `kheops.yml` directory",
},
],
},
"cache": {
"default": "kheops_cache",
"oneOf": [
{
"type": "null",
"description": "Disable cache",
},
{
"type": "string",
"description": "Path of the cache directory",
},
],
},
},
},
# OLD
"tree": {
# "additionalProperties": False,
"type": "object",
"default": {},
"deprecated": True,
"properties": {
"prefix": {
"default": None,
"oneOf": [
{
"type": "null",
"description": "Disable prefix, all files are lookup up from the app root dir.",
},
{
"type": "string",
"description": """Add a path prefix before all paths. This is quite useful to store your YAML data in a dedicated tree.""",
},
],
},
},
}, },
"lookups": { "lookups": {
# "additionalProperties": False, # "additionalProperties": False,
@ -121,30 +82,7 @@ CONF_SCHEMA = {
}, },
}, },
}, },
"tree": {
"type": "array",
"default": [],
"items": {
"type": "object",
"properties": {"$ref": "#/$defs/backends_items"},
}, },
},
"lookups": {
"type": "array",
"default": [],
"items": {
"type": "object",
"properties": {"$ref": "#/$defs/backends_items"},
},
},
"rules": {
"type": "array",
"default": [],
# "arrayItem": { "$ref": "#/$defs/rules_items" },
},
},
# },
# },
} }
@ -184,18 +122,17 @@ class KheopsNamespace(GenericInstance, QueryProcessor):
:type config: Any :type config: Any
""" """
config = schema_validate(config, CONF_SCHEMA)
super().__init__(config)
self.name = name self.name = name
self.config = config or {}
self.app = app self.app = app
self.run = dict(app.run) self.run = dict(app.run)
# Validate configuration # Validate configuration
self.config = schema_validate(self.config, CONF_SCHEMA)
self.run["path_ns"] = str(Path(app.run["config_src"]).parent.resolve()) self.run["path_ns"] = str(Path(app.run["config_src"]).parent.resolve())
class Kheops(GenericInstance): class Kheops(GenericInstance):
""" """
Kheops Application Class Kheops Application Class
@ -278,8 +215,6 @@ class Kheops(GenericInstance):
:type scope: dict :type scope: dict
""" """
ret = {} ret = {}
# Loop over keys # Loop over keys
for key_def in keys: for key_def in keys:
@ -304,7 +239,6 @@ class Kheops(GenericInstance):
except KeyError as err: except KeyError as err:
raise Exception(f"Unknown kheops namespace: {ns_name}") raise Exception(f"Unknown kheops namespace: {ns_name}")
print ("CREATE", ns_name, ns_config)
ns = KheopsNamespace(self, ns_name, ns_config) ns = KheopsNamespace(self, ns_name, ns_config)
# Get result # Get result
@ -328,33 +262,7 @@ class Kheops(GenericInstance):
# To clean/implement
# def DEPRECATED_lookup(
# self,
# keys=None,
# policy=None,
# scope=None,
# trace=False,
# explain=False,
# validate_schema=False,
# ):
# """Lookup a key in hierarchy"""
# log.debug("Lookup key %s with scope: %s", keys, scope)
# assert isinstance(keys, list), f"Got {keys}"
# query = Query(app=self)
# ret = {}
# for key in keys:
# ret[key] = query.exec(
# key=key,
# scope=scope,
# policy=policy,
# trace=trace,
# explain=explain,
# validate_schema=validate_schema,
# )
# return ret
# def DEPRECATED_dump_schema(self): # def DEPRECATED_dump_schema(self):
# """Dump configuration schema""" # """Dump configuration schema"""

309
kheops/controllers.py
View File

@ -1,3 +1,9 @@
"""
Kheops controller
Main Kheops model classes
"""
import json import json
import logging import logging
@ -7,35 +13,45 @@ from pathlib import Path
from prettytable import PrettyTable from prettytable import PrettyTable
import kheops.plugin as KheopsPlugins import kheops.plugin as KheopsPlugins
from kheops.utils import render_template, render_template_python, str_ellipsis from kheops.utils import render_template_python, str_ellipsis
from pprint import pprint
log = logging.getLogger(__name__) log = logging.getLogger(__name__)
tracer = logging.getLogger(f"{__name__}.explain") tracer = logging.getLogger(f"{__name__}.explain")
# Helper classes
# ------------------------
class LoadPlugin: class LoadPlugin:
"""Generic class to load plugins""" """Kheops plugins loader
This plugin loader is a helper to load a python module (Kheops Plugin) from
a plugin kind and name.
"""
def __init__(self, plugins): def __init__(self, plugins):
self.plugins = plugins self.plugins = plugins
def load(self, kind, name): def load(self, kind, name):
"""
Load a plugin
"""
assert isinstance(name, str), f"Got: {name}" assert isinstance(name, str), f"Got: {name}"
# Get plugin kind # Get plugin kind
try: try:
plugins = getattr(self.plugins, kind) plugins = getattr(self.plugins, kind)
except Exception as err: except AttributeError as err:
raise Exception(f"Unknown module kind '{kind}': {err}") raise Exception(f"Unknown module kind '{kind}': {err}") from err
# Get plugin class # Get plugin class
try: try:
plugin_cls = getattr(plugins, name) plugin_cls = getattr(plugins, name)
except Exception as err: except AttributeError as err:
raise Exception(f"Unknown module '{kind}.{name}': {err}") raise Exception(f"Unknown module '{kind}.{name}': {err}") from err
assert hasattr( assert hasattr(
plugin_cls, "Plugin" plugin_cls, "Plugin"
@ -44,11 +60,29 @@ class LoadPlugin:
# Return plugin Classe # Return plugin Classe
return plugin_cls.Plugin return plugin_cls.Plugin
class BackendCandidate():
"""Backend Candidate
plugin_loader = LoadPlugin(KheopsPlugins) This object represents a backend candidate. It holds the value of the
requested key, but also so source path, the status and some other metadata.
"""
def __init__(self, path=None, data=None, run=None, status=None):
assert isinstance(run, dict)
self.path = path
self.status = status or "unparsed"
self.run = run or {}
self.data = data or None
def __repr__(self):
return f"Status: {self.status}, Path: {self.path} => {self.data}"
class Query: class Query:
"""Query object
Object that hold key and scope.
"""
key = None key = None
scope = None scope = None
@ -60,17 +94,25 @@ class Query:
self.rule = None self.rule = None
# class QueryController(): # Query Processor class
# ------------------------
# def exec(self, key=None, scope=None):
# query = Query(key, scope)
# result = self.processor.exec(query)
# return result
class QueryProcessor: class QueryProcessor:
"""QueryProcessor class provides all the methods to be able to make queries""" """QueryProcessor
This class helps to do queries for a given key and scope. It provides a single
public method. It also implement an explain mechanism to help to troubleshoot query
lookup issues.
The query process consists in:
* Create a new query with the key and th scope
* Fetch and expand the lookup list (_exec_assemble_lookups)
* Fetch the rule that match the key (_exec_get_rule)
* Fetch the strategy that match the key
* Query all backends with lookup list (_exec_backend_plugins)
* Return result
"""
default_match_rule = { default_match_rule = {
"key": None, "key": None,
@ -84,19 +126,17 @@ class QueryProcessor:
"continue": True, "continue": True,
} }
# def __init__(self, app): def __init__(self, config):
# self.app = app self.plugin_loader = LoadPlugin(KheopsPlugins)
# self.config = app.conf2['config'] or {}
# self.lookups = app.conf2['lookups'] or []
# self.rules = app.conf2['rules'] or []
def CHILDREN_INIT(self, config):
self.config = config self.config = config
pass
# def exec(self, key=None, scope=None): # Query methods
# ------------------------
def query(self, key=None, scope=None, explain=False): def query(self, key=None, scope=None, explain=False):
"""Query key with scope
"""
if explain: if explain:
tracer.setLevel(logging.DEBUG) tracer.setLevel(logging.DEBUG)
@ -109,27 +149,23 @@ class QueryProcessor:
# Assemble if more than one and merge when continue. # Assemble if more than one and merge when continue.
# Got the Matched rule (RULE CACHE) # Got the Matched rule (RULE CACHE)
# We'll need strategy, and it's selector field: matched/first/last/all # We'll need strategy, and it's selector field: matched/first/last/all
# key_rule = self._get_key_rule(key) or {}
# key_strategy = key_rule.get('strategy', None)
key_rule = self._exec_get_rule(query) key_rule = self._exec_get_rule(query)
log.info("Matched rule for key '%s': %s", query.key, key_rule) log.info("Matched rule for key '%s': %s", query.key, key_rule)
# Build the lookups [] => [] # Build the lookups [] => []
# Fetch static config from app (for include and NS:includes ...) # Fetch static config from app (for include and NS:includes ...)
# Loop over lookups and process each lookup with ScopePlugins # Loop over lookups and process each lookup with ScopePlugins
lookups = self.config.get("lookups", {}).copy() lookups = self.config["lookups"].copy()
parsed_lookups = self._exec_assemble_lookups(lookups, query) parsed_lookups = self._exec_assemble_lookups(lookups, query)
# Generate explain report # Generate explain report
if explain: if explain:
self._explain_lookups(parsed_lookups) self._explain_lookups(parsed_lookups)
# FEtch the module # Fetch the module
# Retrieve the module instance # Retrieve the module instance
# Get it's match policy
# TODO
plugin_name = key_rule.get("strategy", None) plugin_name = key_rule.get("strategy", None)
strategy_plugin = plugin_loader.load("strategy", plugin_name)(self) strategy_plugin = self.plugin_loader.load("strategy", plugin_name)(self)
# Get the data (strategy.selector) # Get the data (strategy.selector)
# For each entry, ask the backend to return the data: file, http, consul ... # For each entry, ask the backend to return the data: file, http, consul ...
@ -151,94 +187,29 @@ class QueryProcessor:
return result return result
def _explain_lookups(self, parsed_lookups):
"""Explain list of lookups"""
table = PrettyTable() # Query parts methods
for item in parsed_lookups: # ------------------------
col1 = json.dumps(
{k: v for k, v in item.items() if k not in ["_run"]},
default=lambda o: "<not serializable>",
indent=2,
)
col2 = json.dumps(
item["_run"], default=lambda o: "<not serializable>", indent=2
)
table.add_row(
[
"\nConfig:" + str_ellipsis(col1, 60),
"\nRuntime:" + str_ellipsis(col2, 60),
]
)
table.field_names = ["Config", "Runtime"]
table.align = "l"
tracer.info("Explain lookups:\n" + str(table))
def _explain_candidates(self, candidates, query): def _exec_get_rule(self, query, mode="match"):
"""Explain list of candidates"""
# TOFIX: query is not needed here ! key = query.key
rules = self.config["rules"] or {}
table = PrettyTable() if mode == "match":
for item_obj in candidates: rule = dict(self.default_match_rule)
item = item_obj.__dict__ rules = [i for i in rules if i.get("key", None) == key]
item["rel_path"] = str(Path(item["path"]).relative_to(Path.cwd())) if len(rules) > 0:
match = rules[0]
col1 = json.dumps( rule.update(match)
{k: v for k, v in item.items() if k not in ["run", "data"]},
default=lambda o: "<not serializable>",
indent=2,
)
col2 = json.dumps(
item["run"]["_run"], default=lambda o: "<not serializable>", indent=2
)
col3 = (
item_obj.data.get(query.key, "NOT FOUND")
if query.key is not None
else item_obj.data
)
col3 = json.dumps(col3, default=lambda o: "<not serializable>", indent=2)
table.add_row(
[
"\nStatus:" + str_ellipsis(col1, 80),
"\nRuntime:" + str_ellipsis(col2, 60),
"\nKey:" + str_ellipsis(col3, 60),
]
)
table.field_names = ["Status", "Runtime", "Key Value"]
table.align = "l"
tracer.info("Explain candidates:\n" + str(table))
def _exec_backend_plugins(self, lookups, selector="matched"):
selector = "matched"
assert selector in ["last", "first", "all", "matched"]
assert isinstance(lookups, list)
# lookups = self.config.get("lookups", {}).copy()
plugins = {}
ret = []
for index, lookup_def in enumerate(lookups):
# Update object
lookup_def["_run"]["backend_index"] = index
# Load plugin
plugin_name = lookup_def["backend"]
if plugin_name in plugins:
plugin = plugins[plugin_name]
else: else:
plugin = plugin_loader.load("backend", plugin_name)(namespace=self) log.debug("Applying default rule for key '%s'", key)
rule = self.default_match_rule
else:
raise Exception(f"Mode '{mode}' is not implemented")
# Get candidates return rule
candidates = plugin.fetch_data(lookup_def)
# Apply selector
for candidate in candidates:
if candidate.status == "found" or selector == "all":
ret.append(candidate)
return ret
def _exec_assemble_lookups(self, lookups, query): def _exec_assemble_lookups(self, lookups, query):
@ -248,10 +219,10 @@ class QueryProcessor:
# Init the scope list # Init the scope list
new_lookups1 = [] new_lookups1 = []
for index, lookup_def in enumerate(lookups): for index, lookup_def in enumerate(lookups):
shortform = False #shortform = False
if isinstance(lookup_def, str): if isinstance(lookup_def, str):
shortform = True #shortform = True
lookup_def = { lookup_def = {
"path": lookup_def, "path": lookup_def,
} }
@ -279,7 +250,7 @@ class QueryProcessor:
plugin_name = plugin_def.get("module", None) plugin_name = plugin_def.get("module", None)
if plugin_name: if plugin_name:
plugin = plugin_loader.load("scope", plugin_name)(namespace=self) plugin = self.plugin_loader.load("scope", plugin_name)(namespace=self)
ret = plugin.process_items(ret, plugin_def) ret = plugin.process_items(ret, plugin_def)
new_lookups2.extend(ret) new_lookups2.extend(ret)
@ -299,21 +270,95 @@ class QueryProcessor:
return new_lookups3 return new_lookups3
def _exec_get_rule(self, query, mode="match"):
key = query.key def _exec_backend_plugins(self, lookups, selector="matched"):
rules = self.config["rules"] or {} selector = "matched"
assert selector in ["last", "first", "all", "matched"]
assert isinstance(lookups, list)
# lookups = self.config.get("lookups", {}).copy()
if mode == "match": plugins = {}
rule = dict(self.default_match_rule) ret = []
rules = [i for i in rules if i.get("key", None) == key] for index, lookup_def in enumerate(lookups):
if len(rules) > 0:
match = rules[0] # Update object
rule.update(match) lookup_def["_run"]["backend_index"] = index
# Load plugin
plugin_name = lookup_def["backend"]
if plugin_name in plugins:
plugin = plugins[plugin_name]
else: else:
log.debug("Applying default rule for key '%s'", key) plugin = self.plugin_loader.load("backend", plugin_name)(namespace=self)
rule = self.default_match_rule
else:
raise Exception(f"Mode '{mode}' is not implemented")
return rule # Get candidates
candidates = plugin.fetch_data(lookup_def)
# Apply selector
for candidate in candidates:
if candidate.status == "found" or selector == "all":
ret.append(candidate)
return ret
# Explain methods
# ------------------------
def _explain_lookups(self, parsed_lookups):
"""Explain list of lookups"""
table = PrettyTable()
for item in parsed_lookups:
col1 = json.dumps(
{k: v for k, v in item.items() if k not in ["_run"]},
default=lambda o: "<not serializable>",
indent=2,
)
col2 = json.dumps(
item["_run"], default=lambda o: "<not serializable>", indent=2
)
table.add_row(
[
"\nConfig:" + str_ellipsis(col1, 60),
"\nRuntime:" + str_ellipsis(col2, 60),
]
)
table.field_names = ["Config", "Runtime"]
table.align = "l"
tracer.info("Explain lookups:\n%s", str(table))
def _explain_candidates(self, candidates, query):
"""Explain list of candidates"""
# TOFIX: query is not needed here !
table = PrettyTable()
for item_obj in candidates:
item = item_obj.__dict__
item["rel_path"] = str(Path(item["path"]).relative_to(Path.cwd()))
col1 = json.dumps(
{k: v for k, v in item.items() if k not in ["run", "data"]},
default=lambda o: "<not serializable>",
indent=2,
)
col2 = json.dumps(
item["run"]["_run"], default=lambda o: "<not serializable>", indent=2
)
col3 = (
item_obj.data.get(query.key, "NOT FOUND")
if query.key is not None and isinstance(item_obj.data, dict)
else item_obj.data
)
col3 = json.dumps(col3, default=lambda o: "<not serializable>", indent=2)
table.add_row(
[
"\nStatus:" + str_ellipsis(col1, 80),
"\nRuntime:" + str_ellipsis(col2, 60),
"\nKey:" + str_ellipsis(col3, 60),
]
)
table.field_names = ["Status", "Runtime", "Key Value"]
table.align = "l"
tracer.info("Explain candidates:\n%s", str(table))