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Refactor - Pass the execution context

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* The variables storage instance is part of the context, so it is no
    longer passed directly in the action implementation code.
  * Instead, a context instance is passed
This commit is contained in:
Emmanuel BENOîT 2022-11-06 11:08:18 +01:00
parent 13d37f254b
commit bebf799dff
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GPG key ID: 2356DC6956CF54EF
1 changed files with 42 additions and 43 deletions
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85
plugins/inventory/reconstructed.py
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@ -505,7 +505,7 @@ class RcInstruction(abc.ABC):
"""
raise NotImplementedError
def run_for(self, host_name, variables):
def run_for(self, host_name, context):
"""Execute the instruction for a given host.
This method is the entry point for instruction execution. Depending on
@ -515,7 +515,7 @@ class RcInstruction(abc.ABC):
Args:
host_name: the name of the host to execute the instruction for
variables: the variable storage instance
context: the execution context
Returns:
``True`` if execution must continue, ``False`` if it must be
@ -526,40 +526,40 @@ class RcInstruction(abc.ABC):
if self._executed_once is False:
self._executed_once = True
# Save previous loop and local variables state
variables._script_stack_push(self._save)
context.variables._script_stack_push(self._save)
try:
# Instructions without loops
if self._loop is None:
self._display.vvvv("%s : running action %s" % (host_name, self._action))
return self.run_iteration(host_name, variables)
return self.run_iteration(host_name, context)
# Loop over all values
for value in self.evaluate_loop(host_name, variables):
for value in self.evaluate_loop(host_name, context.variables):
self._display.vvvv(
"%s : running action %s for item %s"
% (host_name, self._action, repr(value))
)
variables[self._loop_var] = value
if not self.run_iteration(host_name, variables):
context.variables[self._loop_var] = value
if not self.run_iteration(host_name, context):
return False
return True
finally:
# Restore loop variable state
variables._script_stack_pop()
context.variables._script_stack_pop()
def run_iteration(self, host_name, variables):
def run_iteration(self, host_name, context):
"""Check the condition if it exists, then run the instruction.
Args:
host_name: the name of the host to execute the instruction for
variables: the variable storage instance
context: the execution context
Returns:
``True`` if execution must continue, ``False`` if it must be
interrupted
"""
self.compute_locals(variables)
if self.evaluate_condition(host_name, variables):
rv = self.execute_action(host_name, variables)
self.compute_locals(context.variables)
if self.evaluate_condition(host_name, context.variables):
rv = self.execute_action(host_name, context)
if not rv:
self._display.vvvvv(
"%s : action %s returned False, stopping"
@ -670,7 +670,7 @@ class RcInstruction(abc.ABC):
return real_name
@abc.abstractmethod
def execute_action(self, host_name, variables):
def execute_action(self, host_name, context):
"""Execute the instruction.
This method must be overridden to implement the actual action of the
@ -678,10 +678,7 @@ class RcInstruction(abc.ABC):
Args:
host_name: the name of the host to execute the instruction for
merged_vars: the variable cache, with local script variables \
taking precedence over host facts.
host_vars: the host's facts, as a mapping
script_vars: the current script variables, as a mapping
context: the execution context for the current host
Return:
``True`` if the script's execution should continue, ``False`` if
@ -719,7 +716,7 @@ class RciCreateGroup(RcInstruction):
record, "parent"
)
def execute_action(self, host_name, variables):
def execute_action(self, host_name, context):
assert not (
self._group_mbt is None
or self._group_name is None
@ -727,9 +724,11 @@ class RciCreateGroup(RcInstruction):
)
if self._parent_name is not None:
parent = self.get_templated_group(
variables, self._parent_mbt, self._parent_name, must_exist=True
context.variables, self._parent_mbt, self._parent_name, must_exist=True
)
name = self.get_templated_group(variables, self._group_mbt, self._group_name)
name = self.get_templated_group(
context.variables, self._group_mbt, self._group_name
)
self._inventory.add_group(name)
self._display.vvv("- created group %s" % (name,))
if self._parent_name is not None:
@ -756,10 +755,10 @@ class RciAddHost(RcInstruction):
assert self._may_be_template is None and self._group is None
self._may_be_template, self._group = self.parse_group_name(record, "group")
def execute_action(self, host_name, variables):
def execute_action(self, host_name, context):
assert not (self._may_be_template is None or self._group is None)
name = self.get_templated_group(
variables, self._may_be_template, self._group, must_exist=True
context.variables, self._may_be_template, self._group, must_exist=True
)
self._inventory.add_child(name, host_name)
self._display.vvv("- added host %s to %s" % (host_name, name))
@ -789,14 +788,14 @@ class RciAddChild(RcInstruction):
self._group_mbt, self._group_name = self.parse_group_name(record, "group")
self._child_mbt, self._child_name = self.parse_group_name(record, "child")
def execute_action(self, host_name, variables):
def execute_action(self, host_name, context):
assert not (self._group_mbt is None or self._group_name is None)
assert not (self._child_mbt is None or self._child_name is None)
group = self.get_templated_group(
variables, self._group_mbt, self._group_name, must_exist=True
context.variables, self._group_mbt, self._group_name, must_exist=True
)
child = self.get_templated_group(
variables, self._child_mbt, self._child_name, must_exist=True
context.variables, self._child_mbt, self._child_name, must_exist=True
)
self._inventory.add_child(group, child)
self._display.vvv("- added group %s to %s" % (child, group))
@ -843,13 +842,13 @@ class RciSetVarOrFact(RcInstruction):
self._var_name = name
self._var_value = record["value"]
def execute_action(self, host_name, variables):
def execute_action(self, host_name, context):
assert not (
self._var_name is None
or self._name_may_be_template is None
or self._var_value is None
)
self._templar.available_variables = variables
self._templar.available_variables = context.variables
if self._name_may_be_template:
name = self._templar.template(self._var_name)
if not isinstance(name, string_types):
@ -866,9 +865,9 @@ class RciSetVarOrFact(RcInstruction):
value = self._templar.template(self._var_value)
if self._is_fact:
self._inventory.set_variable(host_name, name, value)
variables._set_host_var(name, value)
context.variables._set_host_var(name, value)
else:
variables[name] = value
context.variables[name] = value
self._display.vvv(
"- set %s %s to %s"
% ("fact" if self._is_fact else "var", name, repr(value))
@ -885,7 +884,7 @@ class RciStop(RcInstruction):
def parse_action(self, record):
pass
def execute_action(self, host_name, variables):
def execute_action(self, host_name, context):
self._display.vvv("- stopped execution")
return False
@ -906,11 +905,11 @@ class RciFail(RcInstruction):
def parse_action(self, record):
self._message = record.get("msg", None)
def execute_action(self, host_name, variables):
def execute_action(self, host_name, context):
if self._message is None:
message = "fail requested (%s)" % (host_name,)
else:
self._templar.available_variables = variables
self._templar.available_variables = context.variables
message = self._templar.template(self._message)
self._display.vvv("- failed with message %s" % (message,))
raise AnsibleRuntimeError(message)
@ -1000,24 +999,24 @@ class RciBlock(RcInstruction):
)
return instructions
def execute_action(self, host_name, variables):
def execute_action(self, host_name, context):
assert not (self._block is None or self._rescue is None or self._always is None)
try:
try:
self._display.vvv("- running 'block' instructions")
return self.run_section(self._block, host_name, variables)
return self.run_section(self._block, host_name, context)
except AnsibleError as e:
if not self._rescue:
self._display.vvv("- block failed")
raise
self._display.vvv("- block failed, running 'rescue' instructions")
variables["reconstructed_error"] = str(e)
return self.run_section(self._rescue, host_name, variables)
context.variables["reconstructed_error"] = str(e)
return self.run_section(self._rescue, host_name, context)
finally:
self._display.vvv("- block exited, running 'always' instructions")
self.run_section(self._always, host_name, variables)
self.run_section(self._always, host_name, context)
def run_section(self, section, host_name, variables):
def run_section(self, section, host_name, context):
"""Execute a single section.
This method executes the sequence of instructions in a single section.
@ -1025,14 +1024,14 @@ class RciBlock(RcInstruction):
Args:
section: the list of instructions
host_name: the name of the host being processed
variables: the variable storage area
context: the execution context for the current host
Returns:
``True`` if the script's execution should continue, ``False`` if it
should be interrupted
"""
for instruction in section:
if not instruction.run_for(host_name, variables):
if not instruction.run_for(host_name, context):
return False
return True
@ -1105,9 +1104,9 @@ class InventoryModule(BaseInventoryPlugin):
if not any(g.name == "all" for g in host_groups):
host_groups.append(self.inventory.groups["all"])
group_vars = get_group_vars(host_groups)
variables = VariableStorage(combine_vars(group_vars, host_vars))
context = Context(combine_vars(group_vars, host_vars))
for instruction in instructions:
if not instruction.run_for(host, variables):
if not instruction.run_for(host, context):
return
def dump_program(self, instructions):