Google Healthcare API (基本應用)
===

服務啟動
---
Google Healthcare API包含兩部分:資料集(Dataset)/資料儲存庫(FHIR Data Store)，並提供一個FHIR檢視器，可線上查詢FHIR資料內容。


資料匯入
---
系統提供大量資料匯入/匯出/去識別化等功能


資料查詢
---
使用以下命令，應用Postman取得FHIR資料 : `GET <URL>/Patient/{patient_id}`

* URL: https://healthcare.googleapis.com/v1/projects/{project_id}/locations/{location}/datasets/{dataset_id}/fhirStores/{fhir_store_id}/fhir/

* patient_id:可使用FHIR檢視器取得相關資料

* Authorization: "Bearer $(auth gcloud auth print-access-token)"

其中Token使用Google Cloud SDK Shell取得

* Postman的執行結果：


* 官方網站：[建立及管理FHIR資源](https://cloud.google.com/healthcare-api/docs/how-tos/fhir-resources#curl)

python程式開發
---

使用python發展Google Healthcarfe API範例

1. 程式庫匯入

from googleapiclient import discovery
from google.oauth2 import service_account
from typing import Any, Dict 
from google.auth.transport import requests

import json

2. Credential:呼叫Google Healthcare API必須使用Service Account搭配適當的權限。

cre_file = <credential json file name>

# create a credentials object from the service account file
credentials = service_account.Credentials.from_service_account_file(cre_file)
scoped_credentials = credentials.with_scopes(
    ["https://www.googleapis.com/auth/cloud-platform"]
)

3. 基本參數設定:包含project id、location、dataset id與fhir store id等GCP資源相關參數設定

api_version = "v1"
service_name = "healthcare"

project_id = <project_id>  # replace with your GCP project ID
location = <location>  # replace with the parent dataset's location
dataset_id = <dataset_id>  # replace with the parent dataset's ID
fhir_store_id = <fhir_store_id> # replace with the FHIR store ID
fhir_store_parent = "projects/{}/locations/{}/datasets/{}".format(
    project_id, location, dataset_id
)
fhir_store_name = f"{fhir_store_parent}/fhirStores/{fhir_store_id}"
# URL to the Cloud Healthcare API endpoint and version
base_url = "https://healthcare.googleapis.com/v1"

url = f"{base_url}/projects/{project_id}/locations/{location}"

fhir_store_path = "{}/datasets/{}/fhirStores/{}/fhir".format(
    url, dataset_id, fhir_store_id
)

4. Discovering Healcare API：取得Gogle Healthcare API並執行作業，包含fhir store基本設定查詢(capability)與FHIR資料基本操作(CRUD)

* FHIR Store能力聲明

# Instantiates an authorized API client by discovering the Healthcare API
client = discovery.build(service_name, api_version, credentials=scoped_credentials)
fhir_stores = client.projects().locations().datasets().fhirStores()
response = fhir_stores.fhir().capabilities(name=fhir_store_name).execute()

print(json.dumps(response, indent=2))

* FHIR資料新增(以Patient為例)

patient_body = {
    "name": [{"use": "official", "family": "Smith", "given": ["Katie"]}],
    "gender": "male",
    "birthDate": "2011-03-01",
    "resourceType": "Patient",
}

request = (
    client.projects()
    .locations()
    .datasets()
    .fhirStores()
    .fhir()
    .create(parent=fhir_store_name, type="Patient", body=patient_body)
)
# Sets required application/fhir+json header on the googleapiclient.http.HttpRequest.
request.headers["content-type"] = "application/fhir+json;charset=utf-8"
response = request.execute()

print(f"Created Patient resource with ID {response['id']}")

* FHIR資料查詢(以Patient為例)

resource_type = "Patient"
resource_id = '23b7460b-45d9-f740-323f-ffd776fa5c05'
fhir_resource_path = f"{fhir_store_parent}/fhirStores/{fhir_store_id}/fhir/{resource_type}/{resource_id}"
request = (
    client.projects()
    .locations()
    .datasets()
    .fhirStores()
    .fhir()
    .read(name=fhir_resource_path)
)

print(f"Retrieved {resource_type} resource with ID {resource_id}:")
response = request.execute()
print(json.dumps(response, indent=2))

5. FHIR Data Search:進階的FHIR資料搜尋功能

# Creates a requests Session object with the credentials.
session = requests.AuthorizedSession(scoped_credentials)
resource_path = f"{fhir_store_path}/Patient/_search?family:exact=Zulauf375"

# Sets required application/fhir+json header on the request
headers = {"Content-Type": "application/fhir+json;charset=utf-8"}
response = session.post(resource_path, headers=headers)
response.raise_for_status()

resources = response.json()
print(
    "Using POST request, found a total of {} Patient resources:".format(
        resources["total"]
    )
)
print(json.dumps(resources, indent=2))

6. fhirclient整合，讓資料處理應用更具彈性

import fhirclient.models.patient as p
p = resources['entry'][0]['resource']
print(p['name'][0]['family'])

Dot Net程式開發
---

1.程式庫匯入

#r "nuget:Hl7.Fhir.r4"
#r "nuget:Google.Apis.Auth"
#r "nuget:Google.Apis.Iam.v1"
#r "nuget:Google.Apis.IAMCredentials.v1"

2.基本參數設定

var api_version = "v1";
var service_name = "healthcare";

//# TODO(developer): Uncomment these lines and replace with your values.
var project_id = "sasabot";
var location = "asia-east1";
var dataset_id = "SasaHealthData";
var fhir_store_id = "sasa-healthcare";

var base_url = "https://healthcare.googleapis.com/v1";

var url = base_url + "/projects/" + project_id + "/locations/" + location + "/datasets/" + dataset_id + "/fhirStores/" + fhir_store_id + "/fhir";

3.取得Access Token

using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;

// Load the service account key file
var path = "D:\\Hongyu\\Project\\data\\key\\Google\\sasabot\\";
var jsonPath = path + "sasabot-0ee5855ec32e.json";
GoogleCredential credential = GoogleCredential.FromFileAsync(jsonPath, System.Threading.CancellationToken.None).Result;

credential = credential.CreateScoped(new string[] { "https://www.googleapis.com/auth/cloud-platform" });

var token = await credential.UnderlyingCredential.GetAccessTokenForRequestAsync("",  System.Threading.CancellationToken.None);

4.呼叫Google Healthcare API

// Http request
// use the token to make a request

using System.Net.Http;
using System.Threading.Tasks;
using Hl7.Fhir.Model; 
using Hl7.Fhir.Serialization;

var client = new HttpClient();
client.DefaultRequestHeaders.Add("Authorization", $"Bearer {token}");

var response = await client.GetAsync(url+"/Patient/e2551e8f-c1b4-a79f-0a02-f8ac5a6cfa83");
var content = await response.Content.ReadAsStringAsync();

5.結合Firely Dot NET SDK

using System.Text.Json;
var json = JsonDocument.Parse(content);

var parser = new FhirJsonParser();

Patient patient = parser.Parse<Patient>(content);

patient.Name[0].GivenElement[0].Value