Feat/api integration

backend/app/core/config.py

@@ -0,0 +1,29 @@
+import libvirt
+from app.orm.vm import VmORM
+from dotenv import load_dotenv
+from os import getenv
+from sqlmodel import create_engine, SQLModel
+
+load_dotenv()
+
+db_name = getenv("POSTGRES_NAME", "distribox")
+db_user = getenv("POSTGRES_USER", "distribox_user")
+db_pass = getenv("POSTGRES_PASSWORD", "distribox_password")
+db_port = getenv("POSTGRES_PORT", "5432")
+
+database_url = f"postgresql+psycopg2://{db_user}:{db_pass}@localhost:{db_port}/{db_name}"
+engine = create_engine(database_url, echo=True)
+SQLModel.metadata.create_all(engine)
+
+class QEMUConfig:
+    qemu_conn = None
+
+    @classmethod
+    def get_connection(cls):
+        if cls.qemu_conn is None or cls.qemu_conn.isAlive() == 0:
+            try: 
+                qemu_conn = libvirt.open("qemu:///system")
+            except libvirt.libvirtError:
+                raise
+        return qemu_conn
+

backend/app/core/constants.py

@@ -0,0 +1,17 @@
+from pathlib import Path
+import libvirt
+
+BASE_DIR = Path('/var/lib/distribox/')
+VMS_DIR = BASE_DIR / 'vms'
+IMAGES_DIR = BASE_DIR / 'images'
+
+VM_STATE_NAMES = {
+    libvirt.VIR_DOMAIN_NOSTATE: "No state",
+    libvirt.VIR_DOMAIN_RUNNING: "Running",
+    libvirt.VIR_DOMAIN_BLOCKED: "Bloqué sur E/S",
+    libvirt.VIR_DOMAIN_PAUSED: "Paused",
+    libvirt.VIR_DOMAIN_SHUTDOWN: "Stopping",
+    libvirt.VIR_DOMAIN_SHUTOFF: "Stopped",
+    libvirt.VIR_DOMAIN_CRASHED: "Crashed",
+    libvirt.VIR_DOMAIN_PMSUSPENDED: "Suspended (power management)",
+}

backend/app/core/xml_builder.py

@@ -0,0 +1,57 @@
+from lxml import etree
+from app.models.vm import VmRead
+from app.core.constants import VMS_DIR
+
+def build_xml(vm_read: VmRead):
+
+    domain = etree.Element("domain", type="kvm")
+
+    etree.SubElement(domain, "name").text = str(vm_read.id)
+    etree.SubElement(domain, "memory", unit="MiB").text = str(vm_read.mem)
+    etree.SubElement(domain, "vcpu", placement="static").text = str(vm_read.vcpus)
+
+    os_el = etree.SubElement(domain, "os")
+    etree.SubElement(os_el, "type", arch="x86_64", machine="pc").text = "hvm"
+    etree.SubElement(os_el, "boot", dev="hd")
+
+    features = etree.SubElement(domain, "features")
+    for feature in ["acpi", "apic", "pae"]:
+        etree.SubElement(features, feature)
+
+    etree.SubElement(domain, "cpu", mode="host-passthrough")
+
+    etree.SubElement(domain, "clock", offset="utc")
+
+    etree.SubElement(domain, "on_poweroff").text = "destroy"
+    etree.SubElement(domain, "on_reboot").text = "restart"
+    etree.SubElement(domain, "on_crash").text = "destroy"
+
+    devices = etree.SubElement(domain, "devices")
+
+    disk_main = etree.SubElement(devices, "disk", type="file", device="disk")
+    etree.SubElement(disk_main, "driver", name="qemu", type="qcow2")
+    etree.SubElement(disk_main, "source", file=str(VMS_DIR / str(vm_read.id) / f"distribox-{vm_read.os}.qcow2"))
+    etree.SubElement(disk_main, "target", dev="vda", bus="virtio")
+
+    channel = etree.SubElement(devices, "channel", type="unix")
+    etree.SubElement(channel, "source", mode="bind")
+    etree.SubElement(channel, "target", type="virtio", name="org.qemu.guest_agent.0")
+
+    # disk_seed = etree.SubElement(devices, "disk", type="file", device="cdrom")
+    # etree.SubElement(disk_seed, "driver", name="qemu", type="raw")
+    # etree.SubElement(disk_seed, "source", file="/var/lib/distribox/images/seed.iso")
+    # etree.SubElement(disk_seed, "target", dev="hdb", bus="ide")
+    # etree.SubElement(disk_seed, "readonly")
+
+    iface = etree.SubElement(devices, "interface", type="network")
+    etree.SubElement(iface, "source", network="default")
+    etree.SubElement(iface, "model", type="virtio")
+
+    etree.SubElement(devices, "graphics", type="vnc", port="-1", autoport="yes", listen="127.0.0.1")
+
+    etree.SubElement(devices, "console", type="pty")
+    etree.SubElement(devices, "input", type="keyboard", bus="ps2")
+    etree.SubElement(devices, "input", type="tablet", bus="usb")
+
+    xml_string = etree.tostring(domain, pretty_print=True, encoding="utf-8").decode()
+    return xml_string

backend/app/main.py

@@ -1,15 +1,20 @@
-from typing import Union
-
-from fastapi import FastAPI
-
+from fastapi import FastAPI, HTTPException
+from fastapi.responses import JSONResponse
+from app.routes import vm 
 app = FastAPI()
 
 
-@app.get("/")
-def read_root():
-    return {"Hello": "World"}
-
+@app.exception_handler(HTTPException)
+async def global_exception_handler(_, exc: HTTPException):
+    return JSONResponse(
+        status_code=exc.status_code,
+        content={"detail": exc.detail}
+    )
 
-@app.get("/items/{item_id}")
-def read_item(item_id: int, q: Union[str, None] = None):
-    return {"item_id": item_id, "q": q}
+@app.exception_handler(Exception)
+async def global_exception_handler(_, exc: Exception):
+    return JSONResponse(
+        status_code=500,
+        content={"detail": str(exc)}
+    )
+app.include_router(vm.router, prefix="/vms")

backend/app/models/vm.py

@@ -0,0 +1,15 @@
+from pydantic import BaseModel
+from typing import Optional
+
+class VmBase(BaseModel):
+    os: str
+    mem: int
+    vcpus: int
+    disk_size: int
+
+class VmRead(VmBase):
+    id: str
+    state: str
+
+class VmCreate(VmBase):
+    pass

backend/app/orm/vm.py

@@ -0,0 +1,12 @@
+from sqlmodel import SQLModel, Field
+import uuid
+
+class VmORM(SQLModel, table=True, ):
+    __tablename__ = "vms"
+
+    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
+    os: str
+    mem: int
+    vcpus: int
+    disk_size: int
+    password: str | None = None

backend/app/routes/vm.py

@@ -0,0 +1,39 @@
+from fastapi import  status, APIRouter
+from app.models.vm import VmCreate
+from app.services.vm_service import VmService
+
+router = APIRouter()
+
+@router.get('/', status_code=status.HTTP_200_OK)
+def get_vm_list():
+    vm_list = VmService.get_vm_list()
+    return vm_list
+
+@router.get("/{vm_id}", status_code=status.HTTP_200_OK)
+def get_vm(vm_id: str):
+    vm = VmService.get_vm(vm_id)
+    return vm
+
+@router.get("/{vm_id}/state", status_code=status.HTTP_200_OK)
+def get_vm(vm_id: str):
+    state = VmService.get_state(vm_id)
+    return state
+
+@router.post("/{vm_id}/start", status_code=status.HTTP_200_OK)
+def start_vm(vm_id: str):
+    vm = VmService.start_vm(vm_id)
+    return vm
+
+@router.post("/{vm_id}/stop", status_code=status.HTTP_200_OK)
+def stop_vm(vm_id: str):
+    vm = VmService.stop_vm(vm_id)
+    return vm
+
+@router.post("/", status_code=status.HTTP_201_CREATED)
+def create_vm(vm:VmCreate):
+    created_vm = VmService.create_vm(vm)
+    return created_vm
+
+@router.put("/{vm_id}/password", status_code=status.HTTP_200_OK)
+def set_vm_password(vm_id):
+    return VmService.set_vm_password(vm_id)

backend/app/services/vm_service.py

@@ -0,0 +1,172 @@
+import uuid
+import shutil
+import libvirt
+import hashlib
+from app.utils.vm import wait_for_state
+from typing import Optional
+from app.core.constants import VMS_DIR, IMAGES_DIR, VM_STATE_NAMES
+from app.models.vm import VmCreate
+from app.core.xml_builder import build_xml
+from app.core.config import QEMUConfig, engine
+from sqlmodel import Session, select, update
+from app.orm.vm import VmORM
+from fastapi import status, HTTPException
+
+class Vm:
+    def __init__(self, vm_create: VmCreate):
+        self.id = uuid.uuid4()
+        self.os = vm_create.os
+        self.mem = vm_create.mem
+        self.vcpus = vm_create.vcpus
+        self.disk_size = vm_create.disk_size
+        self.state: Optional[str] = None
+
+
+    def create(self):
+        if self.state :
+            return self
+        self.state = 'Stopped'
+        vm_dir = VMS_DIR / str(self.id)
+        distribox_image_dir = IMAGES_DIR / f"distribox-{self.os}.qcow2"
+        try:
+            vm_dir.mkdir(parents=True, exist_ok=True)
+            shutil.copy(distribox_image_dir, vm_dir)
+            vm_xml = build_xml(self)
+            conn = QEMUConfig.get_connection()
+            conn.defineXML(vm_xml)
+            with Session(engine) as session:
+                vm_record = VmORM(
+                    id = self.id,
+                    os = self.os,
+                    mem = self.mem,
+                    vcpus = self.vcpus,
+                    disk_size= self.disk_size,
+                )
+                session.add(vm_record)
+                session.commit()
+            return self
+        except Exception:
+            raise
+
+    @classmethod
+    def get(cls, vm_id: str):
+        try: 
+            conn = QEMUConfig.get_connection()
+            vm = conn.lookupByName(vm_id)
+            vm_state, _ = vm.state()
+            with Session(engine) as session:
+                vm_record = session.get(VmORM, uuid.UUID(vm_id))
+                vm_instance = cls.__new__(cls)
+                vm_instance.id = vm_record.id
+                vm_instance.os = vm_record.os
+                vm_instance.mem = vm_record.mem
+                vm_instance.vcpus = vm_record.vcpus
+                vm_instance.disk_size =vm_record.disk_size
+            vm_instance.state = VM_STATE_NAMES.get(vm_state, 'None')
+        except libvirt.libvirtError as e:
+            if e.get_error_code() == libvirt.VIR_ERR_NO_DOMAIN:
+                raise HTTPException(status.HTTP_404_NOT_FOUND, f'Vm {vm_id} not found')
+        except Exception:
+            raise
+        return vm_instance
+
+    @classmethod
+    def get_all(cls):
+        try:
+            with Session(engine) as session:
+                statement = select(VmORM)
+                vm_records = session.scalars(statement).all()
+            vm_list = []
+            for vm_record in vm_records:
+                vm_list.append(cls.get(str(vm_record.id)))
+            return vm_list
+        except Exception:
+            raise
+
+    def start(self):
+        try:
+            conn = QEMUConfig.get_connection()
+            vm = conn.lookupByName(str(self.id))
+            if vm.isActive() == 0:
+                vm.create()
+        except libvirt.libvirtError as e:
+            if e.get_error_code() == libvirt.VIR_ERR_NO_DOMAIN:
+                raise HTTPException(status.HTTP_404_NOT_FOUND, f'Vm {vm.id} not found')
+        except Exception:
+            raise
+        state_code = wait_for_state(vm, libvirt.VIR_DOMAIN_RUNNING, 0.5, 10)
+        self.state=VM_STATE_NAMES.get(state_code, 'None')
+        return self
+
+    def stop(self):
+        try:
+            conn = QEMUConfig.get_connection()
+            vm = conn.lookupByName(str(self.id))
+            if vm.isActive() == 1:
+                vm.shutdown()
+        except libvirt.libvirtError as e:
+            if e.get_error_code() == libvirt.VIR_ERR_NO_DOMAIN:
+                raise HTTPException(status.HTTP_404_NOT_FOUND, f'Vm {vm.id} not found')                
+        except Exception:
+            raise
+        state_code = wait_for_state(vm, libvirt.VIR_DOMAIN_SHUTOFF, 5, 10)
+        self.state=VM_STATE_NAMES.get(state_code, 'None')
+        return self
+
+    def get_state(self):
+        try:
+            conn = QEMUConfig.get_connection()
+            vm = conn.lookupByName(str(self.id))
+            state, _ = vm.state()
+        except Exception:
+            raise 
+        return {"state" : VM_STATE_NAMES.get(state, 'None')}
+
+    def generate_password(self):
+        try:
+            random_uuid = str(uuid.uuid4())
+            uuid_bytes = random_uuid.encode('utf-8')
+            hasher = hashlib.sha256()
+            hasher.update(uuid_bytes)
+            password = hasher.hexdigest()
+            with Session(engine) as session:
+                statement = update(VmORM).where(VmORM.id == self.id).values(password=password)
+                session.exec(statement)
+                session.commit()
+            return {"password": password}
+        except Exception:
+            raise
+
+
+class VmService:
+
+    def get_vm_list():
+        vm = Vm.get_all()
+        return vm
+    def get_vm(vm_id: str):
+        vm = Vm.get(vm_id)
+        return vm
+
+    def get_state(vm_id:str):
+        vm = Vm.get(vm_id)
+        state = vm.get_state()
+        return state
+
+    def create_vm(vm_create: VmCreate):
+        vm = Vm(vm_create)
+        vm.create()
+        return vm
+
+    def start_vm(vm_id: str):
+        vm = Vm.get(vm_id)
+        return vm.start()
+
+    def stop_vm(vm_id: str):
+        vm = Vm.get(vm_id)
+        return vm.stop()
+
+    def set_vm_password(vm_id: str):
+        vm = Vm.get(vm_id)
+        return vm.generate_password()
+
+

backend/app/utils/vm.py

@@ -0,0 +1,8 @@
+from time import sleep
+def wait_for_state(vm, state_code: int, timeout: float, retries:  int,):
+    for _ in range(0, retries):
+        code, _ = vm.state()
+        if state_code == code:
+            return code
+        sleep(timeout)
+    return code

backend/requirements.txt

@@ -1 +1,3 @@
 fastapi[standard]
+libvirt-python
+lxml