commit a92472fe2b2cffc5bce1833c29142bb73478c060
Author: Ronald <ronald1985@tutamail.com>
Date:   Sat Jul 6 21:37:46 2024 +0100

    Not much here yet, but it's a start.
    
    Adding this to a repository now, so that I can start tracing the history
    of this.

diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..6236558
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,6 @@
+fastapi
+uvicorn
+pymysql
+sqlalchemy
+pydantic
+typing-extensions
diff --git a/sql_app/__init__.py b/sql_app/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/sql_app/crud.py b/sql_app/crud.py
new file mode 100644
index 0000000..8088efd
--- /dev/null
+++ b/sql_app/crud.py
@@ -0,0 +1,66 @@
+from sqlalchemy.orm import Session
+
+from . import models, schemas
+
+def get_hosts(db: Session):
+    hosts = db.query(models.Host).all()
+
+    return hosts
+
+def get_host_by_hostname(db: Session, hostname: str):
+    db_host = db.query(models.Host).filter(models.Host.hostname == hostname).first()
+    if db_host:
+        return db_host
+    return {}
+
+def get_host_id_for_hostname(db: Session, hostname: str):
+    try:
+        db_host_id = db.query(models.Host).filter(models.Host.hostname == hostname).first().id
+    except AttributeError:
+        return -1
+    return db_host_id
+
+def create_host(db: Session, host: schemas.HostCreate):
+    db_host = models.Host(
+        hostname=host.hostname
+    )
+
+    db.add(db_host)
+    db.commit()
+    db.refresh(db_host)
+
+    return db_host
+
+def delete_host(db: Session, host_id: str):
+    db_host = db.query(models.Host).filter(models.Host.id == host_id).first()
+    db.delete(db_host)
+    db.commit()
+
+    return {
+        "message": "Host successfully deleted"
+    }
+
+def delete_host_by_hostname(db: Session, hostname: str):
+    db_host = db.query(models.Host).filter(models.Host.hostname == hostname).first()
+    db.delete(db_host)
+    db.commit()
+
+    return {
+        "message": "Host successfully deleted"
+    }
+
+def get_cpus_by_host_id(db: Session, host_id: int):
+    return db.query(models.CPU).filter(models.CPU.host_id == host_id)
+
+def create_cpu(db: Session, cpu: schemas.CPUCreate):
+    db_cpu = models.CPU(
+        name=cpu.name,
+        socket=cpu.socket,
+        host_id=cpu.host_id
+    )
+
+    db.add(db_cpu)
+    db.commit()
+    db.refresh(db_cpu)
+
+    return db_cpu
diff --git a/sql_app/database.py b/sql_app/database.py
new file mode 100644
index 0000000..3218890
--- /dev/null
+++ b/sql_app/database.py
@@ -0,0 +1,12 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+SQLALCHEMY_DATABASE_URL = "mysql+pymysql://" + \
+                          "/lsm?charset=utf8mb4"
+
+engine = create_engine(SQLALCHEMY_DATABASE_URL)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
diff --git a/sql_app/main.py b/sql_app/main.py
new file mode 100644
index 0000000..6319448
--- /dev/null
+++ b/sql_app/main.py
@@ -0,0 +1,61 @@
+from typing import List
+
+from fastapi import FastAPI, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from .database import SessionLocal, engine
+from . import models, schemas, crud
+
+models.Base.metadata.create_all(bind=engine)
+app = FastAPI()
+
+# Dependency
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+@app.get("/hosts/", response_model=List[schemas.Host])
+def get_hosts(db: Session = Depends(get_db)):
+    hosts = crud.get_hosts(db)
+
+    return hosts
+
+@app.get("/get_host_by_hostname/{hostname}")
+def get_host_by_hostname(hostname: str, db: Session = Depends(get_db)):
+    return crud.get_host_by_hostname(db, hostname=hostname)
+
+@app.get("/get_host_id_for_hostname/{hostname}")
+def get_host_id_for_hostname(hostname: str, db: Session = Depends(get_db)):
+    return crud.get_host_id_for_hostname(db, hostname=hostname)
+
+@app.post("/add_host/", response_model=schemas.HostCreate, status_code=201)
+def create_host(host: schemas.HostCreate, db: Session = Depends(get_db)):
+    db_host = crud.get_host_by_hostname(db, hostname=host.hostname)
+    if db_host:
+        raise HTTPException(status_code=400, detail="Host already exists")
+
+    return crud.create_host(db=db, host=host)
+
+@app.delete("/delete_host/{host_id}")
+def delete_host(host_id: int, db: Session = Depends(get_db)):
+    return crud.delete_host(db, host_id=host_id)
+
+@app.delete("/delete_host_by_hostname/{hostname}")
+def delete_host_by_hostname(hostname: str, db: Session = Depends(get_db)):
+    return crud.delete_host_by_hostname(db, hostname=hostname)
+
+@app.get("/get_cpus_by_host_id/{host_id}")
+def get_cpus_by_host_id(host_id: int, db: Session = Depends(get_db)) -> List[schemas.CPU]:
+    return crud.get_cpus_by_host_id(db, host_id=host_id)
+
+@app.post("/add_cpu/", response_model=schemas.CPUCreate, status_code=201)
+def create_cpu(cpu: schemas.CPUCreate, db: Session = Depends(get_db)):
+    db_cpus = crud.get_cpus_by_host_id(db, host_id=cpu.host_id)
+    for db_cpu in db_cpus:
+        if cpu.socket == db_cpu.socket:
+            raise HTTPException(status_code=400, detail="CPU already exists")
+
+    return crud.create_cpu(db, cpu=cpu)
diff --git a/sql_app/models.py b/sql_app/models.py
new file mode 100644
index 0000000..1cccc93
--- /dev/null
+++ b/sql_app/models.py
@@ -0,0 +1,37 @@
+from sqlalchemy import Column, Integer, Float, ForeignKey, String
+from sqlalchemy.orm import relationship
+
+from .database import Base
+
+
+class Host(Base):
+    __tablename__ = "hosts"
+
+    id = Column(Integer, primary_key=True)
+    hostname = Column(String(255), unique=True, index=True)
+
+    cpus = relationship("CPU", back_populates="host")
+    memory = relationship("Memory", back_populates="host")
+
+class CPU(Base):
+    __tablename__ = "cpus"
+
+    id = Column(Integer, primary_key=True)
+    socket = Column(Integer, index=True)
+    name = Column(String(255), index=True)
+    usage = Column(Float, index=True)
+    host_id = Column(Integer, ForeignKey("hosts.id"))
+
+    host = relationship("Host", back_populates="cpus")
+
+class Memory(Base):
+    __tablename__ = "memory"
+
+    id = Column(Integer, primary_key=True)
+    type = Column(String(12), index=True)
+    total = Column(Integer, index=True)
+    used = Column(Integer, index=True)
+    usage = Column(Float, index=True)
+    host_id = Column(Integer, ForeignKey("hosts.id"))
+
+    host = relationship("Host", back_populates="memory")
diff --git a/sql_app/schemas.py b/sql_app/schemas.py
new file mode 100644
index 0000000..ee4a3f1
--- /dev/null
+++ b/sql_app/schemas.py
@@ -0,0 +1,45 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+class CPUBase(BaseModel):
+    name: str
+    socket: int
+
+class CPUCreate(CPUBase):
+    host_id: int
+
+class CPU(CPUBase):
+    id: int
+    usage: Optional[float]
+
+    class Config:
+        from_attributes = True
+
+class MemoryBase(BaseModel):
+    type: str
+
+class MemoryCreate(MemoryBase):
+    host_id: int
+
+class Memory(MemoryBase):
+    total: int
+    used: Optional[int]
+    usage: Optional[float]
+
+    class Config:
+        from_attributes = True
+
+class HostBase(BaseModel):
+    hostname: str
+
+class HostCreate(HostBase):
+    pass
+
+class Host(HostBase):
+    id: int
+    cpus: Optional[list['CPU']]
+    memory: Optional[list['Memory']]
+
+    class Config:
+        from_attributes = True