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Mira
2025-12-16 12:50:46 +06:00
parent 8d6a7651dc
commit 833b7961b7
13 changed files with 404 additions and 325 deletions
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163
schema2.sql Normal file
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@@ -0,0 +1,163 @@
begin;
-- roles
alter schema public owner to sensor_admin;
grant usage on schema public to sensor_writer;
grant all on all tables in schema public to sensor_admin;
grant all on all sequences in schema public to sensor_admin;
grant insert, update, select on all tables in schema public to sensor_writer;
grant usage, select on all sequences in schema public to sensor_writer;
alter default privileges for role sensor_admin in schema public
grant insert, update, select on tables to sensor_writer;
alter default privileges for role sensor_admin in schema public
grant usage, select on sequences to sensor_writer;
-- pg_partman
create schema if not exists partman;
create extension if not exists pg_partman schema partman;
do $$
begin
if not exists (select 1 from pg_roles where rolname = 'partman_user') then
create role partman_user with login;
end if;
end$$;
grant all on schema partman to partman_user;
grant all on all tables in schema partman to partman_user;
grant execute on all functions in schema partman to partman_user;
grant execute on all procedures in schema partman to partman_user;
grant all on schema public to partman_user;
grant all on all tables in schema public to partman_user;
grant temporary on database sensor_db to partman_user;
grant create on database sensor_db to partman_user;
grant usage, create on schema partman to sensor_admin;
grant execute on all functions in schema partman to sensor_admin;
grant all on all tables in schema partman to sensor_admin;
grant all on all sequences in schema partman to sensor_admin;
set role sensor_admin;
-- physical/transport endpoints
create table if not exists endpoints (
endpoint_id int primary key generated by default as identity,
endpoint_key text not null unique,
-- 'snmp' | 'mqtt' | 'visa'
protocol text not null,
conn jsonb not null default '{}'::jsonb,
is_enabled boolean not null default true,
created_at timestamptz not null default now(),
updated_at timestamptz not null default now()
);
create index if not exists idx_endpoints_enabled_protocol
on endpoints (is_enabled, protocol);
create table if not exists locations (
location_id int primary key generated by default as identity,
name text not null,
is_active bool not null default true,
constraint locations_name_unique unique (name)
);
create table if not exists devices (
device_id int primary key generated by default as identity,
-- "snmp:10.0.0.12:probe1"
-- "mqtt:esp32-1"
-- "visa:prologix:gpib5"
device_key text not null unique,
endpoint_id int references endpoints(endpoint_id),
location_id int references locations(location_id),
is_enabled boolean not null default true,
metadata jsonb not null default '{}'::jsonb,
created_at timestamptz not null default now(),
updated_at timestamptz not null default now()
);
create index if not exists idx_devices_endpoint on devices (endpoint_id);
create index if not exists idx_devices_location on devices (location_id);
create index if not exists idx_devices_enabled on devices (is_enabled);
-- per-device measurement defs
create table if not exists device_channels (
channel_id int primary key generated by default as identity,
device_id int not null references devices(device_id) on delete cascade,
-- corresponds to a column name in sensor_data (wide mapping)
metric text not null,
-- SNMP: {"type":"snmp_oid","oid":".1.3.6...","datatype":"float"}
-- MQTT: {"type":"mqtt_topic","topic":"sensors/x/telemetry","payload":"json","field":"temperature_c"}
-- VISA: {"type":"scpi","query":"MEAS:VOLT:DC?","read_termination":"\n"}
source jsonb not null,
scale_value double precision not null default 1.0,
offset_value double precision not null default 0.0,
poll_interval_s int,
is_enabled boolean not null default true,
created_at timestamptz not null default now(),
constraint device_channels_unique_metric unique (device_id, metric)
);
create index if not exists idx_device_channels_device on device_channels (device_id);
-- device health/status
create table if not exists device_status (
device_id int primary key references devices(device_id) on delete cascade,
last_seen timestamptz,
last_ok timestamptz,
last_error_at timestamptz,
last_error text,
updated_at timestamptz not null default now()
);
create table if not exists sensor_data (
ts timestamptz not null,
device_id int not null references devices(device_id),
location_id int references locations(location_id),
temp_c real,
humidity_rh real,
pressure_pa real,
light_lux real,
soil_moist real,
co2_ppm real,
voltage_v real,
current_a real,
resistance_ohm real,
freq_hz real,
power_w real,
constraint sensor_data_pk primary key (device_id, ts)
) partition by range (ts);
create index if not exists idx_sensor_data_device_ts on sensor_data (device_id, ts desc);
create index if not exists idx_sensor_data_location_ts on sensor_data (location_id, ts desc);
create index if not exists idx_sensor_data_ts_brin on sensor_data using brin(ts);
-- partition
select partman.create_parent(
p_parent_table => 'public.sensor_data',
p_control => 'ts',
p_interval => '1 year',
p_premake => 2
);
commit;

8
schema_reader.sql Normal file
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@@ -0,0 +1,8 @@
-- run as a privileged role (e.g., sensor_admin)
create role sensor_reader login password 'GLuBeBFPZuxjru2OYiwlI1eT5Fg';
grant usage on schema public to sensor_reader;
grant select on all tables in schema public to sensor_reader;
alter default privileges for role sensor_admin in schema public
grant select on tables to sensor_reader;

4
sensgw/db.py
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@@ -1,7 +1,6 @@
# sensgw/db.py
import asyncpg
import json
from typing import Optional
async def _init_connection(con: asyncpg.Connection) -> None:
@@ -22,7 +21,7 @@ async def _init_connection(con: asyncpg.Connection) -> None:
class Database:
def __init__(self, dsn: str):
self._dsn = dsn
self.pool: Optional[asyncpg.Pool] = None
self.pool: asyncpg.Pool | None = None
async def start(self) -> None:
self.pool = await asyncpg.create_pool(
@@ -36,4 +35,3 @@ class Database:
if self.pool:
await self.pool.close()
self.pool = None

85
sensgw/main.py
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@@ -4,15 +4,19 @@ from __future__ import annotations
import asyncio
import logging
from sensgw.models import Endpoint
from .config import load_config
from .db import Database
from .registry import load_registry
from .writer import Writer
from .protocols.mqtt import MqttCollector, MqttBinding
from .protocols.prologix import PrologixEndpointCollector, PrologixBinding
from .protocols.prologix import (
PrologixBinding,
PrologixEndpointLoop,
)
from .protocols.snmp import SnmpEndpointCollector, SnmpBinding
# from .protocols.visa import VisaCollector, VisaBinding
async def _run() -> None:
@@ -23,14 +27,13 @@ async def _run() -> None:
db = Database(cfg.db_dsn)
await db.start()
writer = Writer(db)
tasks: list[asyncio.Task[None]] = []
try:
reg = await load_registry(db)
by_proto = reg.channels_by_protocol()
tasks: list[asyncio.Task[None]] = []
# --- MQTT (assumes one broker; if multiple, split by endpoint_id) ---
# MQTT
mqtt_bindings: list[MqttBinding] = []
for ep, dev, ch in by_proto.get("mqtt", []):
src = ch.source
@@ -51,8 +54,8 @@ async def _run() -> None:
mqttc = MqttCollector(writer)
tasks.append(asyncio.create_task(mqttc.run(mqtt_bindings), name="mqtt"))
# --- SNMP (one task per endpoint) ---
snmp_bindings_by_ep: dict[int, tuple[object, list[SnmpBinding]]] = {}
# SNMP
snmp_bindings_by_ep: dict[int, tuple[Endpoint, list[SnmpBinding]]] = {}
for ep, dev, ch in by_proto.get("snmp", []):
src = ch.source
if src.get("type") != "snmp_oid":
@@ -67,7 +70,9 @@ async def _run() -> None:
)
snmp_bindings_by_ep.setdefault(ep.endpoint_id, (ep, []))[1].append(b)
snmpc = SnmpEndpointCollector(writer, default_poll_s=cfg.default_poll_interval_s)
snmpc = SnmpEndpointCollector(
writer, default_poll_s=cfg.default_poll_interval_s
)
for _ep_id, (ep, bindings) in snmp_bindings_by_ep.items():
tasks.append(
asyncio.create_task(
@@ -76,53 +81,51 @@ async def _run() -> None:
)
)
# --- Prologix (one task per channel/binding) ---
prolc = PrologixEndpointCollector(writer, default_poll_s=cfg.default_poll_interval_s)
# Prologix
# Group bindings by Endpoint ID
prologix_groups: dict[int, tuple[Endpoint, list[PrologixBinding]]] = {}
for ep, dev, ch in by_proto.get("prologix", []):
src = ch.source
if src.get("type") != "scpi":
continue
b = PrologixBinding(
endpoint=ep,
device=dev,
channel=ch,
query=str(src["query"]),
datatype=str(src.get("datatype", "float")),
)
tasks.append(
asyncio.create_task(
prolc.run_binding(b),
name=f"prologix:{dev.device_id}:{ch.metric}",
)
endpoint=ep, device=dev, channel=ch, query=str(src["query"])
)
# --- VISA ---
# visac = VisaCollector(writer, default_poll_s=cfg.default_poll_interval_s)
# for ep, dev, ch in by_proto.get("visa", []):
# src = ch.source
# if src.get("type") != "scpi":
# continue
# b = VisaBinding(
# endpoint=ep,
# device=dev,
# channel=ch,
# query=str(src["query"]),
# datatype=str(src.get("datatype", "float")),
# )
# tasks.append(
# asyncio.create_task(
# visac.run_binding(b),
# name=f"visa:{dev.device_id}:{ch.metric}",
# )
# )
if ep.endpoint_id not in prologix_groups:
prologix_groups[ep.endpoint_id] = (ep, [])
prologix_groups[ep.endpoint_id][1].append(b)
# one Task per Endpoint
for _, (ep, bindings) in prologix_groups.items():
loop = PrologixEndpointLoop(
writer=writer,
endpoint=ep,
bindings=bindings,
default_poll_s=cfg.default_poll_interval_s,
)
tasks.append(
asyncio.create_task(loop.run(), name=f"prologix:{ep.endpoint_key}")
)
if not tasks:
log.warning("No enabled channels found. Exiting.")
return
log.info("Running with %d task(s)", len(tasks))
await asyncio.gather(*tasks)
_ = await asyncio.gather(*tasks)
except asyncio.CancelledError:
# clean exit on SIGINT
pass
finally:
if tasks:
for t in tasks:
_ = t.cancel()
_ = await asyncio.gather(*tasks, return_exceptions=True)
await db.stop()

13
sensgw/metrics.py
View File

@@ -1,13 +0,0 @@
ALLOWED_METRICS = {
"temp_c",
"humidity_rh",
"pressure_pa",
"light_lux",
"soil_moist",
"co2_ppm",
"voltage_v",
"current_a",
"resistance_ohm",
"freq_hz",
"power_w",
}

15
sensgw/models.py
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@@ -1,6 +1,6 @@
# sensgw/models.py
from dataclasses import dataclass
from typing import Any, Dict, Optional
from typing import Any
@dataclass(frozen=True)
@@ -8,7 +8,7 @@ class Endpoint:
endpoint_id: int
endpoint_key: str
protocol: str
conn: Dict[str, Any]
conn: dict[str, Any]
is_enabled: bool
@@ -16,10 +16,10 @@ class Endpoint:
class Device:
device_id: int
device_key: str
endpoint_id: Optional[int]
location_id: Optional[int]
endpoint_id: int | None
location_id: int | None
is_enabled: bool
metadata: Dict[str, Any]
metadata: dict[str, Any]
@dataclass(frozen=True)
@@ -27,9 +27,8 @@ class Channel:
channel_id: int
device_id: int
metric: str
source: Dict[str, Any]
source: dict[str, Any]
scale_value: float
offset_value: float
poll_interval_s: Optional[int]
poll_interval_s: int | None
is_enabled: bool

2
sensgw/protocols/mqtt.py
View File

@@ -86,7 +86,7 @@ class MqttCollector:
)
c.on_message = self._on_message
# Optional auth
# auth?
if "username" in ep.conn:
c.username_pw_set(ep.conn["username"], ep.conn.get("password"))

5
sensgw/protocols/polling.py
View File

@@ -1,7 +1,8 @@
# sensgw/protocols/polling.py
import asyncio
import datetime as dt
from typing import Awaitable, Callable, Optional
from typing import Callable
from collections.abc import Awaitable
async def poll_forever(
@@ -9,7 +10,7 @@ async def poll_forever(
interval_s: int,
read_once: Callable[[], Awaitable[None]],
jitter_s: float = 0.0,
stop_event: Optional[asyncio.Event] = None,
stop_event: asyncio.Event | None = None,
) -> None:
if jitter_s:
await asyncio.sleep(jitter_s)

192
sensgw/protocols/prologix.py
View File

@@ -3,13 +3,15 @@ from __future__ import annotations
import asyncio
import datetime as dt
import threading
import logging
from collections import defaultdict
from dataclasses import dataclass
from typing import Any
from ..models import Endpoint, Device, Channel
from ..writer import Writer
from .polling import poll_forever
log = logging.getLogger(__name__)
@dataclass(frozen=True)
@@ -18,169 +20,153 @@ class PrologixBinding:
device: Device
channel: Channel
query: str
datatype: str # "float" | "int" | ...
def _parse_numeric(datatype: str, raw: str) -> float:
kind = (datatype or "float").strip().lower()
if kind == "int":
return float(int(raw))
# default: float
return float(raw)
def _driver_class(driver_key: str) -> type[Any] | None:
"""
Map driver keys stored in DB to PyMeasure instrument classes.
devices.metadata.driver examples:
- "keithley2000"
"""
def _driver_class(driver_key: str | None) -> type[Any] | None:
key = (driver_key or "").strip().lower()
if not key:
return None
if key in {"keithley2000", "keithley_2000", "keithley:2000"}:
if key in {"keithley2000", "keithley_2000"}:
from pymeasure.instruments.keithley import Keithley2000 # type: ignore
return Keithley2000
# Add more mappings here as you add support.
return None
class PrologixEndpointClient:
class PrologixEndpointLoop:
"""
One shared Prologix adapter per endpoint, protected by a lock because it is stateful
(address switching) and not safe to use concurrently.
If a device specifies devices.metadata.driver, we create a PyMeasure Instrument on top
of the same adapter and run queries through instrument.ask().
Manages one physical Prologix controller and sequentially polls its devices.
Merges connection state (Adapter) and logic (Collector) into one class.
"""
def __init__(self, endpoint: Endpoint):
def __init__(
self,
writer: Writer,
endpoint: Endpoint,
bindings: list[PrologixBinding],
default_poll_s: int,
):
self.writer = writer
self.endpoint = endpoint
self._lock = threading.Lock()
self.bindings = bindings
self.default_poll_s = default_poll_s
# conn state
self._adapter: Any | None = None
self._instruments: dict[tuple[int, str], Any] = {}
self._initialized_addrs: set[int] = set()
def _get_adapter(self) -> Any:
if self._adapter is None:
from pymeasure.adapters import PrologixAdapter # type: ignore
try:
resource = self.endpoint.conn["resource"]
except KeyError as e:
raise RuntimeError(
f"Missing endpoint.conn['resource'] for endpoint_id={self.endpoint.endpoint_id}"
) from e
res = self.endpoint.conn["resource"]
to_ms = int(self.endpoint.conn.get("gpib_read_timeout_ms", 500))
read_timeout = int(self.endpoint.conn.get("gpib_read_timeout_ms", 200))
auto = bool(self.endpoint.conn.get("auto", False))
# auto=False gives us manual control over addressing
self._adapter = PrologixAdapter(res, gpib_read_timeout=to_ms, auto=False)
self._adapter = PrologixAdapter(
resource,
gpib_read_timeout=read_timeout,
auto=auto,
)
try:
self._adapter.flush_read_buffer()
except Exception:
pass
return self._adapter
def _get_instrument(self, *, gpib_addr: int, driver_key: str) -> Any:
"""
Cached per (addr, driver_key). Uses the shared adapter.
"""
key = (gpib_addr, driver_key.strip().lower())
inst = self._instruments.get(key)
if inst is not None:
return inst
def _get_instrument(self, gpib_addr: int, driver_key: str) -> Any:
cache_key = (gpib_addr, driver_key)
if cache_key in self._instruments:
return self._instruments[cache_key]
cls = _driver_class(driver_key)
if cls is None:
raise KeyError(f"Unknown driver '{driver_key}'")
if not cls:
raise ValueError(f"Unknown driver: {driver_key}")
ad = self._get_adapter()
# Ensure the adapter is pointed at the correct instrument when the driver is constructed.
ad.address = gpib_addr
inst = cls(ad)
self._instruments[key] = inst
self._instruments[cache_key] = inst
return inst
def query(self, *, gpib_addr: int, cmd: str, driver_key: str | None = None) -> str:
"""
Execute a query at a given GPIB address.
If driver_key is provided and known, execute via driver (instrument.ask).
Otherwise, raw adapter write/read.
"""
with self._lock:
def _exec_sync(self, gpib_addr: int, query: str, driver_key: str | None) -> str:
# init hw
if gpib_addr not in self._initialized_addrs:
dk_check = (driver_key or "").lower()
if "keithley" in dk_check:
try:
log.info(f"Initializing Keithley @ {gpib_addr} (DISP:ENAB OFF)")
if driver_key:
inst = self._get_instrument(gpib_addr, driver_key)
inst.write(":DISP:ENAB OFF")
else:
ad = self._get_adapter()
ad.address = gpib_addr
ad.write(":DISP:ENAB OFF")
except Exception as e:
log.warning(f"VFD saver failed for {gpib_addr}: {e}")
self._initialized_addrs.add(gpib_addr)
# Query
if driver_key:
inst = self._get_instrument(gpib_addr=gpib_addr, driver_key=driver_key)
# Keep the endpoint lock held across ask(); it may do multiple I/O ops.
return str(inst.ask(cmd)).strip()
ad.write(cmd)
inst = self._get_instrument(gpib_addr, driver_key)
# re-assert address in case it chnaged
self._get_adapter().address = gpib_addr
return str(inst.ask(query)).strip()
else:
ad = self._get_adapter()
ad.address = gpib_addr
ad.write(query)
return str(ad.read()).strip()
async def run(self) -> None:
log.info(
f"Starting Prologix loop: {self.endpoint.endpoint_key} ({len(self.bindings)} bindings)"
)
class PrologixEndpointCollector:
def __init__(self, writer: Writer, default_poll_s: int):
self.writer = writer
self.default_poll_s = default_poll_s
self._clients: dict[int, PrologixEndpointClient] = {}
# group by device
by_device = defaultdict(list)
for b in self.bindings:
by_device[b.device.device_id].append(b)
def _client(self, endpoint: Endpoint) -> PrologixEndpointClient:
client = self._clients.get(endpoint.endpoint_id)
if client is None:
client = PrologixEndpointClient(endpoint)
self._clients[endpoint.endpoint_id] = client
return client
while True:
start_ts = asyncio.get_running_loop().time()
async def run_binding(self, b: PrologixBinding) -> None:
interval_s = int(b.channel.poll_interval_s or self.default_poll_s)
client = self._client(b.endpoint)
gpib_addr = b.device.metadata.get("gpib_addr")
for _dev_id, dev_bindings in by_device.items():
# validation
meta = dev_bindings[0].device.metadata
gpib_addr = meta.get("gpib_addr")
if gpib_addr is None:
raise RuntimeError(
f"Missing device.metadata.gpib_addr for device_id={b.device.device_id}"
)
continue
gpib_addr = int(gpib_addr)
driver_key = str(meta.get("driver", "")).strip() or None
driver_key = b.device.metadata.get("driver")
driver_key = str(driver_key).strip() if driver_key else None
async def read_once() -> None:
ts = dt.datetime.now(dt.timezone.utc)
for b in dev_bindings:
try:
# offload to thread
raw = await asyncio.to_thread(
client.query,
gpib_addr=gpib_addr,
cmd=b.query,
driver_key=driver_key,
self._exec_sync, gpib_addr, b.query, driver_key
)
v = _parse_numeric(b.datatype, raw)
v = v * b.channel.scale_value + b.channel.offset_value
val = float(raw)
val = val * b.channel.scale_value + b.channel.offset_value
await self.writer.write_metric(
ts=ts,
ts=dt.datetime.now(dt.timezone.utc),
device_id=b.device.device_id,
location_id=b.device.location_id,
metric=b.channel.metric,
value=v,
value=val,
)
except Exception as e:
log.error(
f"Prologix error {b.device.device_key}/{b.channel.metric}: {e}"
)
await self.writer.write_error(
device_id=b.device.device_id,
error=f"prologix: {e}",
device_id=b.device.device_id, error=f"prologix: {e}"
)
await poll_forever(interval_s=interval_s, read_once=read_once)
await asyncio.sleep(0)
elapsed = asyncio.get_running_loop().time() - start_ts
await asyncio.sleep(max(0.5, self.default_poll_s - elapsed))

64
sensgw/protocols/snmp.py
View File

@@ -4,6 +4,16 @@ from __future__ import annotations
import datetime as dt
from dataclasses import dataclass
from pysnmp.hlapi.v3arch.asyncio import (
SnmpEngine,
CommunityData,
UdpTransportTarget,
ContextData,
ObjectType,
ObjectIdentity,
get_cmd,
)
from ..models import Endpoint, Device, Channel
from ..writer import Writer
from .polling import poll_forever
@@ -15,7 +25,7 @@ class SnmpBinding:
device: Device
channel: Channel
oid: str
datatype: str # "float" | "int" | ...
datatype: str
def _parse_numeric(datatype: str, raw: str) -> float:
@@ -26,11 +36,6 @@ def _parse_numeric(datatype: str, raw: str) -> float:
def _parse_version(conn: dict) -> int:
"""
Return mpModel:
SNMPv1 -> 0
SNMPv2c -> 1
"""
v = str(conn.get("version", "2c")).lower()
if v in {"1", "v1", "snmpv1"}:
return 0
@@ -41,6 +46,10 @@ class SnmpEndpointCollector:
def __init__(self, writer: Writer, default_poll_s: int):
self.writer = writer
self.default_poll_s = default_poll_s
self._engine = SnmpEngine()
async def close(self):
self._engine.close_dispatcher()
async def _get_many(
self,
@@ -52,22 +61,12 @@ class SnmpEndpointCollector:
timeout_s: int,
oids: list[str],
) -> dict[str, str]:
from pysnmp.hlapi.v3arch.asyncio import ( # type: ignore
SnmpEngine,
CommunityData,
UdpTransportTarget,
ContextData,
ObjectType,
ObjectIdentity,
get_cmd,
)
snmp_engine = self._engine
snmp_engine = SnmpEngine()
try:
var_binds = [ObjectType(ObjectIdentity(oid)) for oid in oids]
# In pysnmp 7.x, target creation is async:
target = await UdpTransportTarget.create((host, port), timeout=timeout_s, retries=0)
target = await UdpTransportTarget.create(
(host, port), timeout=timeout_s, retries=0
)
iterator = get_cmd(
snmp_engine,
@@ -77,27 +76,29 @@ class SnmpEndpointCollector:
*var_binds,
)
# await the response
error_indication, error_status, error_index, out_binds = await iterator
if error_indication:
raise RuntimeError(str(error_indication))
if error_status:
raise RuntimeError(
f"{error_status.prettyPrint()} at "
f"{out_binds[int(error_index) - 1][0] if error_index else '?'}"
)
idx = int(error_index) - 1
oid_caused = out_binds[idx][0] if 0 <= idx < len(out_binds) else "?"
raise RuntimeError(f"{str(error_status)} at {oid_caused}")
return {str(name): str(val) for name, val in out_binds}
finally:
snmp_engine.close_dispatcher()
async def run_endpoint(self, endpoint: Endpoint, bindings: list[SnmpBinding]) -> None:
async def run_endpoint(
self, endpoint: Endpoint, bindings: list[SnmpBinding]
) -> None:
host = endpoint.conn["host"]
port = int(endpoint.conn.get("port", 161))
community = endpoint.conn.get("community", "public")
timeout_s = int(endpoint.conn.get("timeout_s", 2))
mp_model = _parse_version(endpoint.conn)
# if one channel is 1s and another is 60s, we poll ALL at 1s.
intervals = [
int(b.channel.poll_interval_s)
for b in bindings
@@ -105,6 +106,7 @@ class SnmpEndpointCollector:
]
interval_s = min(intervals) if intervals else self.default_poll_s
# map clean string OIDs to bindings
oid_to_binding: dict[str, SnmpBinding] = {b.oid.strip(): b for b in bindings}
oids = list(oid_to_binding.keys())
@@ -124,6 +126,7 @@ class SnmpEndpointCollector:
b = oid_to_binding.get(oid_str)
if b is None:
continue
try:
v = _parse_numeric(b.datatype, raw)
v = v * b.channel.scale_value + b.channel.offset_value
@@ -138,15 +141,14 @@ class SnmpEndpointCollector:
except Exception as e:
await self.writer.write_error(
device_id=b.device.device_id,
error=f"snmp parse/write: {e}",
error=f"snmp parse: {e}",
)
except Exception as e:
# Endpoint-level failure: mark all devices as error
# log endpoint-level failure
for b in bindings:
await self.writer.write_error(
device_id=b.device.device_id,
error=f"snmp endpoint: {e}",
error=f"snmp fetch: {e}",
)
await poll_forever(interval_s=interval_s, read_once=read_once)

84
sensgw/protocols/visa.py
View File

@@ -1,84 +0,0 @@
# sensgw/protocols/visa.py
from __future__ import annotations
import asyncio
import datetime as dt
from dataclasses import dataclass
from ..models import Endpoint, Device, Channel
from ..writer import Writer
from .polling import poll_forever
@dataclass(frozen=True)
class VisaBinding:
endpoint: Endpoint
device: Device
channel: Channel
query: str
datatype: str # "float" etc
def _visa_query_sync(*, resource: str, conn: dict, device_meta: dict, query: str) -> str:
import pyvisa # type: ignore
rm = pyvisa.ResourceManager()
inst = rm.open_resource(resource)
# Optional serial config
if "baud_rate" in conn and hasattr(inst, "baud_rate"):
inst.baud_rate = int(conn["baud_rate"])
if "read_termination" in conn:
inst.read_termination = str(conn["read_termination"])
if "write_termination" in conn:
inst.write_termination = str(conn["write_termination"])
# If you're using a Prologix-like controller over serial, you may need to set addr.
# This is device-specific; keeping it optional:
gpib_addr = device_meta.get("gpib_addr")
if gpib_addr is not None:
inst.write(f"++addr {int(gpib_addr)}")
return str(inst.query(query)).strip()
class VisaCollector:
def __init__(self, writer: Writer, default_poll_s: int):
self.writer = writer
self.default_poll_s = default_poll_s
async def run_binding(self, b: VisaBinding) -> None:
ep = b.endpoint
resource = ep.conn["resource"]
interval_s = int(b.channel.poll_interval_s or self.default_poll_s)
async def read_once() -> None:
try:
raw = await asyncio.to_thread(
_visa_query_sync,
resource=resource,
conn=ep.conn,
device_meta=b.device.metadata,
query=b.query,
)
if b.datatype == "float":
value = float(raw)
elif b.datatype == "int":
value = float(int(raw))
else:
value = float(raw)
value = value * b.channel.scale_value + b.channel.offset_value
ts = dt.datetime.now(dt.timezone.utc)
await self.writer.write_metric(
ts=ts,
device_id=b.device.device_id,
location_id=b.device.location_id,
metric=b.channel.metric,
value=value,
)
except Exception as e:
await self.writer.write_error(device_id=b.device.device_id, error=f"visa: {e}")
await poll_forever(interval_s=interval_s, read_once=read_once)

24
sensgw/registry.py
View File

@@ -1,6 +1,5 @@
# sensgw/registry.py
from dataclasses import dataclass
from typing import Dict, List, Tuple
from .models import Endpoint, Device, Channel
from .db import Database
@@ -8,12 +7,12 @@ from .db import Database
@dataclass(frozen=True)
class Registry:
endpoints: Dict[int, Endpoint]
devices: Dict[int, Device]
channels: List[Channel]
endpoints: dict[int, Endpoint]
devices: dict[int, Device]
channels: list[Channel]
def channels_by_protocol(self) -> Dict[str, List[Tuple[Endpoint, Device, Channel]]]:
out: Dict[str, List[Tuple[Endpoint, Device, Channel]]] = {}
def channels_by_protocol(self) -> dict[str, list[tuple[Endpoint, Device, Channel]]]:
out: dict[str, list[tuple[Endpoint, Device, Channel]]] = {}
for ch in self.channels:
dev = self.devices.get(ch.device_id)
if not dev or not dev.is_enabled or dev.endpoint_id is None:
@@ -67,8 +66,12 @@ async def load_registry(db: Database) -> Registry:
int(r["device_id"]): Device(
device_id=int(r["device_id"]),
device_key=str(r["device_key"]),
endpoint_id=(int(r["endpoint_id"]) if r["endpoint_id"] is not None else None),
location_id=(int(r["location_id"]) if r["location_id"] is not None else None),
endpoint_id=(
int(r["endpoint_id"]) if r["endpoint_id"] is not None else None
),
location_id=(
int(r["location_id"]) if r["location_id"] is not None else None
),
is_enabled=bool(r["is_enabled"]),
metadata=(r["metadata"] or {}),
)
@@ -83,11 +86,12 @@ async def load_registry(db: Database) -> Registry:
source=(r["source"] or {}),
scale_value=float(r["scale_value"]),
offset_value=float(r["offset_value"]),
poll_interval_s=(int(r["poll_interval_s"]) if r["poll_interval_s"] is not None else None),
poll_interval_s=(
int(r["poll_interval_s"]) if r["poll_interval_s"] is not None else None
),
is_enabled=bool(r["is_enabled"]),
)
for r in ch_rows
]
return Registry(endpoints=endpoints, devices=devices, channels=channels)

18
sensgw/writer.py
View File

@@ -2,10 +2,22 @@
from __future__ import annotations
import datetime as dt
from typing import Optional
from .db import Database
from .metrics import ALLOWED_METRICS
ALLOWED_METRICS = {
"temp_c",
"humidity_rh",
"pressure_pa",
"light_lux",
"soil_moist",
"co2_ppm",
"voltage_v",
"current_a",
"resistance_ohm",
"freq_hz",
"power_w",
}
class Writer:
@@ -17,7 +29,7 @@ class Writer:
*,
ts: dt.datetime,
device_id: int,
location_id: Optional[int],
location_id: int | None,
metric: str,
value: float,
) -> None: