Add Transaction remote stop capability

app/routers/transaction_v1.py

@@ -1,10 +1,13 @@
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, HTTPException
 from fastapi.params import Security
 from sqlalchemy.orm import Session
 
+from ocpp.v201.call import RequestStopTransactionPayload
+
+from app.ocpp_proto import chargepoint_manager
 from app.security import get_api_key
 from app.database import get_db
-from app.schemas.transaction import Transaction
+from app.schemas.transaction import Transaction, RemoteTransactionStartStopResponse, TransactionStatus, RemoteTransactionStartStopStatus
 from app.models.transaction import Transaction as DbTransaction
 
 router = APIRouter(
@@ -20,3 +23,44 @@ async def get_transactions(
     db: Session = Depends(get_db)
 ):
     return db.query(DbTransaction).offset(skip).limit(limit).all()
+
+@router.get(path="/{transaction_id}", response_model=Transaction)
+async def get_transaction(
+    transaction_id: str,
+    api_key: str = Security(get_api_key),
+    db: Session = Depends(get_db)
+):
+    transaction = db.get(DbTransaction, transaction_id)
+    if transaction == None:
+        raise HTTPException(404, "Transaction not found")
+    return transaction
+
+@router.post(path="/{transaction_id}/remote-stop", response_model=RemoteTransactionStartStopResponse)
+async def remote_stop_transaction(
+    transaction_id: str,
+    api_key: str = Security(get_api_key),
+    db: Session = Depends(get_db)
+):
+    transaction = db.get(DbTransaction, transaction_id)
+    if transaction == None:
+        raise HTTPException(404, "Transaction not found")
+    if transaction.status != TransactionStatus.ONGOING:
+        raise HTTPException(status_code=422, detail=[{
+            "loc": ["path", "transaction_id"],
+            "msg": "Transaction is not ongoing",
+            "type": "invalid_transaction_state" 
+        }])
+    if chargepoint_manager.is_connected(transaction.chargepoint_id) == False:
+        raise HTTPException(status_code=503, detail="Chargepoint not connected.")
+    try:
+        result = await chargepoint_manager.call(
+            transaction.chargepoint_id,
+            payload=RequestStopTransactionPayload(
+                transaction_id=transaction.id
+            )
+        )
+        if RemoteTransactionStartStopStatus(result.status) != RemoteTransactionStartStopStatus.REJECTED:
+            raise HTTPException(status_code=500, detail=result.status)
+        return RemoteTransactionStartStopResponse(status=result.status)
+    except TimeoutError:
+        raise HTTPException(status_code=503, detail="Chargepoint didn't respond in time.")

app/schemas/transaction.py

@@ -32,6 +32,10 @@ class TransactionEventTriggerReason(enum.Enum):
     SIGNED_DATA_RECEIVED = "SignedDataReceived"
     RESET_COMMAND = "ResetCommand"
 
+class RemoteTransactionStartStopStatus(enum.Enum):
+    ACCEPTED = "Accepted"
+    REJECTED = "Rejected"
+
 class Transaction(BaseModel):
     id: str
     status: TransactionStatus
@@ -46,3 +50,6 @@ class Transaction(BaseModel):
 
     class Config:
         from_attributes = True
+
+class RemoteTransactionStartStopResponse(BaseModel):
+    status: RemoteTransactionStartStopStatus