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import requests
import json
from typing import List, Dict, Optional
from datetime import datetime
class HAPIFHIRClient:
"""
Client for connecting to HAPI FHIR Test Server
"""
def __init__(self, base_url: str = "https://hapi.fhir.org/baseR4"):
self.base_url = base_url
self.session = requests.Session()
self.session.headers.update({
'Content-Type': 'application/fhir+json',
'Accept': 'application/fhir+json'
})
def get_patients(self, limit: int = 50) -> List[Dict]:
"""
Fetch patients from HAPI FHIR Test Server
"""
try:
url = f"{self.base_url}/Patient"
params = {
'_count': limit,
'_format': 'json'
}
response = self.session.get(url, params=params)
response.raise_for_status()
data = response.json()
patients = []
if 'entry' in data:
for entry in data['entry']:
patient = self._parse_patient(entry['resource'])
if patient:
patients.append(patient)
return patients
except requests.RequestException as e:
print(f"Error fetching patients: {e}")
return []
def get_patient_by_id(self, patient_id: str) -> Optional[Dict]:
"""
Fetch a specific patient by ID
"""
try:
url = f"{self.base_url}/Patient/{patient_id}"
response = self.session.get(url)
response.raise_for_status()
patient_data = response.json()
return self._parse_patient(patient_data)
except requests.RequestException as e:
print(f"Error fetching patient {patient_id}: {e}")
return None
def get_patient_observations(self, patient_id: str) -> List[Dict]:
"""
Fetch observations (vital signs, lab results) for a patient
"""
try:
url = f"{self.base_url}/Observation"
params = {
'subject': f"Patient/{patient_id}",
'_count': 100,
'_format': 'json'
}
response = self.session.get(url, params=params)
response.raise_for_status()
data = response.json()
observations = []
if 'entry' in data:
for entry in data['entry']:
observation = self._parse_observation(entry['resource'])
if observation:
observations.append(observation)
return observations
except requests.RequestException as e:
print(f"Error fetching observations for patient {patient_id}: {e}")
return []
def get_patient_medications(self, patient_id: str) -> List[Dict]:
"""
Fetch medications for a patient
"""
try:
url = f"{self.base_url}/MedicationRequest"
params = {
'subject': f"Patient/{patient_id}",
'_count': 100,
'_format': 'json'
}
response = self.session.get(url, params=params)
response.raise_for_status()
data = response.json()
medications = []
if 'entry' in data:
for entry in data['entry']:
medication = self._parse_medication(entry['resource'])
if medication:
medications.append(medication)
return medications
except requests.RequestException as e:
print(f"Error fetching medications for patient {patient_id}: {e}")
return []
def get_patient_conditions(self, patient_id: str) -> List[Dict]:
"""
Fetch conditions (diagnoses) for a patient
"""
try:
url = f"{self.base_url}/Condition"
params = {
'subject': f"Patient/{patient_id}",
'_count': 100,
'_format': 'json'
}
response = self.session.get(url, params=params)
response.raise_for_status()
data = response.json()
conditions = []
if 'entry' in data:
for entry in data['entry']:
condition = self._parse_condition(entry['resource'])
if condition:
conditions.append(condition)
return conditions
except requests.RequestException as e:
print(f"Error fetching conditions for patient {patient_id}: {e}")
return []
def _parse_patient(self, patient_data: Dict) -> Optional[Dict]:
"""
Parse FHIR Patient resource into our format
"""
try:
# Extract basic demographics
name = ""
if 'name' in patient_data and patient_data['name']:
name_parts = patient_data['name'][0]
given = name_parts.get('given', [])
family = name_parts.get('family', '')
name = f"{' '.join(given)} {family}".strip()
# Extract address
address = ""
if 'address' in patient_data and patient_data['address']:
addr = patient_data['address'][0]
line = addr.get('line', [])
city = addr.get('city', '')
state = addr.get('state', '')
postal_code = addr.get('postalCode', '')
address = f"{', '.join(line)}, {city}, {state} {postal_code}".strip()
# Extract contact info
phone = ""
email = ""
if 'telecom' in patient_data:
for telecom in patient_data['telecom']:
if telecom.get('system') == 'phone':
phone = telecom.get('value', '')
elif telecom.get('system') == 'email':
email = telecom.get('value', '')
return {
'id': patient_data.get('id', ''),
'fhir_id': patient_data.get('id', ''),
'full_name': name,
'gender': patient_data.get('gender', 'unknown'),
'date_of_birth': patient_data.get('birthDate', ''),
'address': address,
'phone': phone,
'email': email,
'marital_status': self._get_marital_status(patient_data),
'language': self._get_language(patient_data),
'source': 'hapi_fhir',
'status': 'active',
'created_at': datetime.now().isoformat(),
'updated_at': datetime.now().isoformat()
}
except Exception as e:
print(f"Error parsing patient data: {e}")
return None
def _parse_observation(self, observation_data: Dict) -> Optional[Dict]:
"""
Parse FHIR Observation resource
"""
try:
code = observation_data.get('code', {})
coding = code.get('coding', [])
code_text = code.get('text', '')
if coding:
code_text = coding[0].get('display', code_text)
value = observation_data.get('valueQuantity', {})
unit = value.get('unit', '')
value_amount = value.get('value', '')
return {
'id': observation_data.get('id', ''),
'code': code_text,
'value': f"{value_amount} {unit}".strip(),
'date': observation_data.get('effectiveDateTime', ''),
'category': self._get_observation_category(observation_data)
}
except Exception as e:
print(f"Error parsing observation: {e}")
return None
def _parse_medication(self, medication_data: Dict) -> Optional[Dict]:
"""
Parse FHIR MedicationRequest resource
"""
try:
medication = medication_data.get('medicationCodeableConcept', {})
coding = medication.get('coding', [])
name = medication.get('text', '')
if coding:
name = coding[0].get('display', name)
dosage = medication_data.get('dosageInstruction', [])
dosage_text = ""
if dosage:
dosage_text = dosage[0].get('text', '')
return {
'id': medication_data.get('id', ''),
'name': name,
'dosage': dosage_text,
'status': medication_data.get('status', 'active'),
'prescribed_date': medication_data.get('authoredOn', ''),
'requester': self._get_practitioner_name(medication_data)
}
except Exception as e:
print(f"Error parsing medication: {e}")
return None
def _parse_condition(self, condition_data: Dict) -> Optional[Dict]:
"""
Parse FHIR Condition resource
"""
try:
code = condition_data.get('code', {})
coding = code.get('coding', [])
name = code.get('text', '')
if coding:
name = coding[0].get('display', name)
return {
'id': condition_data.get('id', ''),
'code': name,
'status': condition_data.get('clinicalStatus', {}).get('coding', [{}])[0].get('code', 'active'),
'onset_date': condition_data.get('onsetDateTime', ''),
'recorded_date': condition_data.get('recordedDate', ''),
'notes': condition_data.get('note', [{}])[0].get('text', '') if condition_data.get('note') else ''
}
except Exception as e:
print(f"Error parsing condition: {e}")
return None
def _get_marital_status(self, patient_data: Dict) -> str:
"""Extract marital status from patient data"""
if 'maritalStatus' in patient_data:
coding = patient_data['maritalStatus'].get('coding', [])
if coding:
return coding[0].get('display', 'Unknown')
return 'Unknown'
def _get_language(self, patient_data: Dict) -> str:
"""Extract language from patient data"""
if 'communication' in patient_data and patient_data['communication']:
language = patient_data['communication'][0].get('language', {})
coding = language.get('coding', [])
if coding:
return coding[0].get('display', 'English')
return 'English'
def _get_observation_category(self, observation_data: Dict) -> str:
"""Extract observation category"""
category = observation_data.get('category', {})
coding = category.get('coding', [])
if coding:
return coding[0].get('display', 'Unknown')
return 'Unknown'
def _get_practitioner_name(self, medication_data: Dict) -> str:
"""Extract practitioner name from medication request"""
requester = medication_data.get('requester', {})
reference = requester.get('reference', '')
if reference.startswith('Practitioner/'):
# In a real implementation, you'd fetch the practitioner details
return 'Dr. Practitioner'
return 'Unknown' |