Adds slurm support

stimela/backends/__init__.py

@@ -10,6 +10,7 @@
 from .singularity import SingularityBackendOptions
 from .kube import KubeBackendOptions
 from .native import NativeBackendOptions
+from .slurm import SlurmOptions
 
 import stimela
 
@@ -20,11 +21,15 @@
 SUPPORTED_BACKENDS = set(Backend.__members__)
 
 
-def get_backend(name: str):
+def get_backend(name: str, backend_opts: Optional[Dict] = None):
+    """
+    Gets backend, given a name and an optional set of options for that backend.
+    Returns backend module, or None if it is not available.
+    """
     if name not in SUPPORTED_BACKENDS:
         return None
     backend = __import__(f"stimela.backends.{name}", fromlist=[name])
-    if backend.is_available():
+    if backend.is_available(backend_opts):
         return backend
     return None
 
@@ -48,7 +53,7 @@ class StimelaBackendOptions(object):
     kube: Optional[KubeBackendOptions] = None
     native: Optional[NativeBackendOptions] = None 
     docker: Optional[Dict] = None  # placeholder for future impl
-    slurm: Optional[Dict] = None   # placeholder for future impl
+    slurm: Optional[SlurmOptions] = None   
 
     ## Resource limits applied during run -- see resource module
     rlimits: Dict[str, Any] = EmptyDictDefault()
@@ -71,6 +76,8 @@ def __post_init__(self):
             self.native = NativeBackendOptions()
         if self.kube is None and get_backend("kube"):
             self.kube = KubeBackendOptions()
+        if self.slurm is None:
+            self.slurm = SlurmOptions()
 
 StimelaBackendSchema = OmegaConf.structured(StimelaBackendOptions)
 
@@ -106,7 +113,7 @@ def _call_backends(backend_opts: StimelaBackendOptions, log: logging.Logger, met
         # check that backend has not been disabled
         opts = getattr(backend_opts, engine, None)
         if not opts or opts.enable:
-            backend = get_backend(engine)
+            backend = get_backend(engine, opts)
             func = backend and getattr(backend, method, None)
             if func:
                 try:

stimela/backends/docker.py

@@ -25,7 +25,7 @@
 
 STATUS = VERSION = BINARY = None
 
-def is_available():
+def is_available(opts = None):
     global STATUS, VERSION, BINARY
     if STATUS is None:
         BINARY = which("docker")

stimela/backends/kube/__init__.py

@@ -1,4 +1,4 @@
-from typing import Dict, List, Optional, Any
+from typing import Dict, List, Optional, Any, Callable
 from enum import Enum
 from omegaconf import OmegaConf
 from dataclasses import dataclass
@@ -36,52 +36,6 @@
     def run(*args, **kw):
         raise RuntimeError(f"kubernetes backend {STATUS}")
 
-def is_available():
-    return AVAILABLE
-
-def get_status():
-    return STATUS
-
-def is_remote():
-    return True
-
-def init(backend: 'stimela.backend.StimelaBackendOptions', log: logging.Logger):
-    from . import infrastructure
-    global AVAILABLE, STATUS
-    if not infrastructure.init(backend, log):
-        AVAILABLE = False
-        STATUS = "initialization error"
-
-def close(backend: 'stimela.backend.StimelaBackendOptions', log: logging.Logger):
-    from . import infrastructure
-    if AVAILABLE:
-        infrastructure.close(backend, log)
-
-def cleanup(backend: 'stimela.backend.StimelaBackendOptions', log: logging.Logger):
-    from . import infrastructure
-    infrastructure.cleanup(backend, log)
-
-def run(cab: 'stimela.kitchen.cab.Cab', params: Dict[str, Any], fqname: str,
-        backend: 'stimela.backend.StimelaBackendOptions',
-        log: logging.Logger, subst: Optional[Dict[str, Any]] = None):
-    from . import run_kube
-    return run_kube.run(cab=cab, params=params, fqname=fqname, backend=backend, log=log, subst=subst)
-
-_kube_client = _kube_config = _kube_context = None
-
-def get_kube_api(context: Optional[str]=None):
-    global _kube_client
-    global _kube_config
-    global _kube_context
-
-    if _kube_config is None:
-        _kube_config = True
-        _kube_context = context
-        kubernetes.config.load_kube_config(context=context)
-    elif context != _kube_context:
-        raise BackendError(f"k8s context has changed (was {_kube_context}, now {context}), this is not permitted")
-
-    return core_v1_api.CoreV1Api(), CustomObjectsApi()
 
 
 # dict of methods for converting an object to text format
@@ -110,8 +64,6 @@ class PodLimits(object):
     # arbitrary additional structure copied into the pod spec
     custom_pod_spec:  Dict[str, Any] = EmptyDictDefault()
 
-
-
 @dataclass
 class KubeBackendOptions(object):
     """
@@ -267,6 +219,57 @@ class UserInfo(object):
 
 
 KubeBackendSchema = OmegaConf.structured(KubeBackendOptions)
+
+def is_available(opts: Optional[KubeBackendOptions]= None):
+    return AVAILABLE
+
+def get_status():
+    return STATUS
+
+def is_remote():
+    return True
+
+def init(backend: 'stimela.backend.StimelaBackendOptions', log: logging.Logger):
+    from . import infrastructure
+    global AVAILABLE, STATUS
+    if not infrastructure.init(backend, log):
+        AVAILABLE = False
+        STATUS = "initialization error"
+
+def close(backend: 'stimela.backend.StimelaBackendOptions', log: logging.Logger):
+    from . import infrastructure
+    if AVAILABLE:
+        infrastructure.close(backend, log)
+
+def cleanup(backend: 'stimela.backend.StimelaBackendOptions', log: logging.Logger):
+    from . import infrastructure
+    infrastructure.cleanup(backend, log)
+
+def run(cab: 'stimela.kitchen.cab.Cab', params: Dict[str, Any], fqname: str,
+        backend: 'stimela.backend.StimelaBackendOptions',
+        log: logging.Logger, subst: Optional[Dict[str, Any]] = None,
+        command_wrapper: Optional[Callable] = None):
+    # normally runner.py won't allow this, but check just in case
+    if command_wrapper:
+        raise BackendError(f"kube backend cannot be used with a command wrapper")
+    from . import run_kube
+    return run_kube.run(cab=cab, params=params, fqname=fqname, backend=backend, log=log, subst=subst)
+
+_kube_client = _kube_config = _kube_context = None
+
+def get_kube_api(context: Optional[str]=None):
+    global _kube_client
+    global _kube_config
+    global _kube_context
+
+    if _kube_config is None:
+        _kube_config = True
+        _kube_context = context
+        kubernetes.config.load_kube_config(context=context)
+    elif context != _kube_context:
+        raise BackendError(f"k8s context has changed (was {_kube_context}, now {context}), this is not permitted")
+
+    return core_v1_api.CoreV1Api(), CustomObjectsApi()
 
 _uid = os.getuid()
 _gid = os.getgid()

stimela/backends/kube/run_kube.py

@@ -1,5 +1,5 @@
 import logging, time, json, datetime, os.path, pathlib, secrets, shlex
-from typing import Dict, Optional, Any, List
+from typing import Dict, Optional, Any, List, Callable
 from dataclasses import fields
 from datetime import timedelta
 from requests import ConnectionError
@@ -44,13 +44,13 @@ def run(cab: Cab, params: Dict[str, Any], fqname: str,
     """
 
     if not cab.image:
-        raise StimelaCabRuntimeError(f"kube runner requires cab.image to be set")
+        raise BackendError(f"kube backend requires cab.image to be set")
 
     kube = backend.kube
 
     namespace = kube.namespace
     if not namespace:
-        raise StimelaCabRuntimeError(f"runtime.kube.namespace must be set")
+        raise BackendError(f"runtime.kube.namespace must be set")
 
     args = cab.flavour.get_arguments(cab, params, subst, check_executable=False)
     log.debug(f"command line is {args}")

stimela/backends/native/__init__.py

@@ -3,7 +3,7 @@
 import logging
 import stimela
 
-def is_available():
+def is_available(opts = None):
     return True
 
 def get_status():

stimela/backends/native/run_native.py

@@ -1,6 +1,6 @@
 import logging, datetime, resource, os.path
 
-from typing import Dict, Optional, Any, List
+from typing import Dict, Optional, Any, List, Callable
 
 import stimela
 import stimela.kitchen
@@ -37,14 +37,18 @@ def build_command_line(cab: 'stimela.kitchen.cab.Cab', params: Dict[str, Any], s
 
 def run(cab: 'stimela.kitchen.cab.Cab', params: Dict[str, Any], fqname: str,
         backend: 'stimela.backend.StimelaBackendOptions',
-        log: logging.Logger, subst: Optional[Dict[str, Any]] = None):
-    """Runs cab contents
+        log: logging.Logger, subst: Optional[Dict[str, Any]] = None,
+        command_wrapper: Optional[Callable] = None):
+    """
+    Runs cab contents
 
     Args:
-        cab (Cab): cab object
+        cab: cab object
+        params: cab parameters
+        backend: backed settings object
         log (logger): logger to use
         subst (Optional[Dict[str, Any]]): Substitution dict for commands etc., if any.
-
+        command_wrapper (Callable): takes a list of args and returns modified list of args
     Returns:
         Any: return value (e.g. exit code) of content
     """
@@ -79,6 +83,9 @@ def elapsed(since=None):
         return str(datetime.datetime.now() - (since or start_time)).split('.', 1)[0]
 
     # log.info(f"argument lengths are {[len(a) for a in args]}")
+
+    if command_wrapper:
+        args = command_wrapper(args)
 
     retcode = xrun(args[0], args[1:], shell=False, log=log,
                 output_wrangler=cabstat.apply_wranglers,

stimela/backends/podman.py

@@ -8,7 +8,7 @@
 import datetime
 import tempfile
 
-def is_available():
+def is_available(opts = None):
     return False
 
 def get_status():

stimela/backends/runner.py

@@ -1,12 +1,38 @@
-from typing import Dict, Optional, Any
+import logging
+from typing import Dict, Optional, Any, Callable
+from dataclasses import dataclass
 from omegaconf import OmegaConf
 from omegaconf.errors import OmegaConfBaseException 
+import stimela
 from stimela.backends import StimelaBackendOptions, StimelaBackendSchema
 from stimela.exceptions import BackendError
 
-from . import get_backend, get_backend_status
+from . import get_backend, get_backend_status, slurm
 
-def validate_backend_settings(backend_opts: Dict[str, Any]):
+
+@dataclass
+class BackendWrapper(object):
+    opts: StimelaBackendOptions
+    is_remote: bool
+    is_remote_fs: bool
+    backend: Any
+    backend_name: str
+    run_command_wrapper: Optional[Callable]
+    build_command_wrapper: Optional[Callable]
+
+    def run(self, cab: 'stimela.kitchen.cab.Cab', params: Dict[str, Any], fqname: str,
+            log: logging.Logger, subst: Optional[Dict[str, Any]] = None):
+        return self.backend.run(cab, params, fqname=fqname, backend=self.opts, log=log, subst=subst, 
+                              command_wrapper=self.run_command_wrapper)
+
+    def build(self, cab: 'stimela.kitchen.cab.Cab', log: logging.Logger, rebuild=False):
+       if not hasattr(self.backend, 'build'):
+           raise BackendError(f"{self.backend_name} backend does not support the build command")
+       return self.backend.build(cab, backend=self.opts, log=log, rebuild=rebuild,
+                                command_wrapper=self.build_command_wrapper)
+
+
+def validate_backend_settings(backend_opts: Dict[str, Any]) -> BackendWrapper:
     """Checks that backend settings refer to a valid backend
 
     Returs tuple of options, main, wrapper, where 'main' the the main backend, and 'wrapper' is an optional wrapper backend 
@@ -15,26 +41,35 @@ def validate_backend_settings(backend_opts: Dict[str, Any]):
     if not isinstance(backend_opts, StimelaBackendOptions):
         backend_opts = OmegaConf.to_object(backend_opts)
 
-    main = main_backend = None
+    backend_name = backend = None
     selected = backend_opts.select or ['native']
     # select containerization engine, if any
-    for engine in selected: 
+    for name in selected: 
         # check that backend has not been disabled
-        opts = getattr(backend_opts, engine, None)
+        opts = getattr(backend_opts, name, None)
         if not opts or opts.enable:
-            main_backend = get_backend(engine)
-            if main_backend is not None:
-                main = engine
+            backend = get_backend(name, opts)
+            if backend is not None:
+                backend_name = name
                 break
     else:
         raise BackendError(f"selected backends ({', '.join(selected)}) not available")
-
+
+    is_remote = is_remote_fs = backend.is_remote()
+
     # check if slurm wrapper is to be applied
-    wrapper = None
-    if False:   # placeholder -- should be: if backend.slurm and backed.slurm.enable
-        wrapper = get_backend('slurm') 
-        if wrapper is None:
-            raise BackendError(f"backend 'slurm' not available ({get_backend_status('slurm')})")
+    if backend_opts.slurm.enable:
+        if is_remote:
+            raise BackendError(f"can't combine slurm with {backend_name} backend")
+        is_remote = True
+        is_remote_fs = False
+        run_command_wrapper = backend_opts.slurm.run_command_wrapper
+        build_command_wrapper = backend_opts.slurm.build_command_wrapper
+    else:
+        run_command_wrapper = build_command_wrapper = None
 
-    return backend_opts, main_backend, wrapper
+    return BackendWrapper(opts=backend_opts, is_remote=is_remote, is_remote_fs=is_remote_fs, 
+                          backend=backend, backend_name=backend_name, 
+                          run_command_wrapper=run_command_wrapper,
+                          build_command_wrapper=build_command_wrapper)