generate: container: Implement Accounting, Cgroup and Cpu

Implment the 'Accounting', 'Cgroup', and 'Cpu' classes to control the
contaienr cgroup and cpu usage.

Signed-off-by: Enno Tensing <tenno@suij.in>

generate/container.py

@@ -29,7 +29,7 @@ class ConfigError(Exception):
         return f"Configuration error: {self.message}"
 
 
-def maybe(json: dict, key: str) -> str | dict | list | bool | None:
+def maybe(json: dict, key: str) -> ConfigValue:
     """Maybe get a value."""
     try:
         return json[key]
@@ -37,6 +37,14 @@ def maybe(json: dict, key: str) -> str | dict | list | bool | None:
         return None
 
 
+def maybe_or(json: dict, key: str, _or: ConfigValue) -> ConfigValue:
+    """Maybe get a value, but return _or if it is None."""
+    val = maybe(json, key)
+    if val is None or not isinstance(val, _or):
+        return _or
+    return val
+
+
 def trim(s: str) -> str:
     """Remove sequential whitespace."""
     s = s.replace("\t ", "\t")
@@ -46,6 +54,149 @@ def trim(s: str) -> str:
     return s
 
 
+@dataclass
+class Cgroup:
+    """cgroup Config."""
+
+    config: list
+    parent: str
+    namespace: str
+    how: str
+
+    @classmethod
+    def from_json(cls, val: ConfigValue, logger: Log) -> Self:
+        """Create from JSON."""
+        if not isinstance(val, dict):
+            logger.log_warning("cgroup Config is invalid!")
+            return cls([], "", "", "")
+
+        config = maybe_or(val, "config", [])
+        parent = maybe_or(val, "parent", "")
+        namespace = maybe_or(val, "namespace", "")
+        how = maybe_or(val, "how", "")
+
+        if not isinstance(config, list):
+            logger.log_warning("Config key in cgroup Config is invalid!")
+            config = []
+
+        if not isinstance(parent, str):
+            logger.log_warning("Parent key in cgroup Config is invalid!")
+            parent = ""
+
+        if not isinstance(namespace, str):
+            logger.log_warning("Namespace key in cgroup Config is invalid!")
+            namespace = ""
+
+        if not isinstance(how, str):
+            logger.log_warning("How key in cgroup Config is invalid!")
+            how = ""
+
+        if how == "split" and parent != "":
+            logger.log_warning(
+                "Split cgroups can not be combined with a cgroup parent!"
+            )
+            parent = ""
+
+        return cls(config, parent, namespace, how)
+
+    def command(self) -> str:
+        """Option for podman container create."""
+        cmd = ""
+        seperator = " \\\n"
+        cmd += seperator.join(
+            [f"\t--cgroup-conf={option}" for option in self.config]
+        )
+        if self.parent != "":
+            cmd += f"\t--cgroup-parent={self.parent}{seperator}"
+        if self.namespace != "":
+            cmd += f"\t--cgroupns={self.namespace}{seperator}"
+        if self.how != "":
+            cmd += f"\t--cgroups={self.how}{seperator}"
+
+        return cmd
+
+
+@dataclass
+class Cpu:
+    """CPU Accounting."""
+
+    period: str
+    quota: str
+    shares: str
+    number: str
+    cpuset_cpus: str
+    cpuset_mems: str
+
+    @classmethod
+    def from_json(cls, val: ConfigValue, logger: Log) -> Self:
+        """Create from JSON."""
+        if not isinstance(val, dict):
+            logger.log_warning("cpu Config is invalid!")
+            return cls("", "", "", "", "", "")
+
+        period = maybe_or(val, "period", "")
+        quota = maybe_or(val, "quota", "")
+        shares = maybe_or(val, "shares", "")
+        number = maybe_or(val, "number", "")
+        cpuset = maybe_or(val, "cpuset", {})
+        cpuset_cpus = ""
+        cpuset_mems = ""
+        if len(cpuset) != 0:
+            cpuset_cpus += maybe_or(cpuset, "cpus", "")
+            cpuset_mems += maybe_or(cpuset, "mems", "")
+
+        return cls(
+            period,
+            quota,
+            shares,
+            number,
+            cpuset_cpus,
+            cpuset_mems,
+        )
+
+    def command(self) -> str:
+        """Option for podman container create."""
+        cmd = ""
+        seperator = " \\\n"
+        if self.period != "":
+            cmd += f"\t--cpu-period={self.period}{seperator}"
+        if self.quota != "":
+            cmd += f"\t--cpu-quota={self.quota}{seperator}"
+        if self.shares != "":
+            cmd += f"\t--cpu-shares={self.shares}{seperator}"
+        if self.number != "":
+            cmd += f"\t--cpus={self.number}{seperator}"
+        if self.cpuset_cpus != "":
+            cmd += f"\t--cpuset-cpus={self.cpuset_cpus}{seperator}"
+        if self.cpuset_mems != "":
+            cmd += f"\t--cpuset-mems={self.cpuset_mems}{seperator}"
+
+        return cmd
+
+
+@dataclass
+class Accounting:
+    """Resource Accounting."""
+
+    cgroup: Cgroup
+    cpu: Cpu
+
+    @classmethod
+    def from_json(cls, data: ConfigValue, logger: Log) -> Self:
+        """Create from JSON."""
+        cgroup_data = maybe(data, "cgroup")
+        cpu_data = maybe(data, "cpu")
+        cgroup = Cgroup.from_json(cgroup_data, logger)
+        cpu = Cpu.from_json(cpu_data, logger)
+        return cls(cgroup, cpu)
+
+    def command(self) -> str:
+        """Options for podman container create."""
+        cgroup = self.cgroup.command()
+        cpu = self.cpu.command()
+        return cgroup + cpu
+
+
 @dataclass
 class Volume:
     """Container Volume."""