def save_supplier_to_blockchain(supplier):
"""save the given supplier on the blockchain by calling the ledger service
"""
try:
call_ledger_api(
"post", "/ledger/suppliers", {
"uuid": supplier.uuid,
"short_id": "",
"name": supplier.name,
"passwd": supplier.password,
"url": ""
})
except APIError as error:
raise APIError("Failed to save supplier to blockchain. " + str(error))
def save_part_to_blockchain(part):
"""save the given part on the blockchain by calling the ledger service
"""
try:
call_ledger_api("post", "/ledger/parts", {
"uuid": part.uuid,
"name": part.name,
"checksum": "",
"version": part.version,
"src_uri": part.url,
"licensing": part.licensing,
"label": "",
"description": part.description
})
except APIError as error:
raise APIError("Failed to save part to blockchain. " + str(error))
def register_app_with_blockchain():
"""call the conductor service to register this app (sparts catalog) on the supply chain network
"""
print("Registering app with blockchain...")
data = {
"name": "Software Parts Catalog",
"label": "Software Parts Catalog",
"uuid": "9fb84fa0-1716-4367-7012-61370e23028f",
"api_address": "http://catalog.open.windriver.com",
"app_type": "website",
"description": "Software Parts Catalog"
}
try:
return call_conductor_api("post", "/apps/register", data)
except APIError as error:
raise APIError("Failed to register app with blockchain. " + str(error))
def call_api_service(method, url, data):
"""call the API service at url with given HTTP method and parameters
"""
if app.config["BYPASS_API_CALLS"]:
return {}
try:
print("Calling [" + method + "] " + url)
print("with " + str(data))
if method == "get":
response = requests.get(url, params=data, \
timeout=app.config["DEFAULT_API_TIMEOUT"])
elif method == "post":
response = requests.post(url, data=json.dumps(data), \
headers={'Content-type': 'application/json'}, \
timeout=app.config["DEFAULT_API_TIMEOUT"])
else:
raise APIError("Bad method passed to function `call_api()`. Got `" + method \
+ "`; expected 'get' or 'post'.")
if response.status_code != 200:
raise APIError("The call to " + url + " resulted in HTTP status " \
+ str(response.status_code))
try:
json_response = response.json()
except:
raise APIError("Failed to parse the JSON data in the response of API service at " \
+ url + ". The response was `" + str(response.content) + "`.")
if "status" in json_response and json_response["status"] != "success":
raise APIError("API service at '" + url + "' returned status '" \
+ str(json_response["status"]) + "', with the following details: " \
+ str(json_response))
return json_response
except ReadTimeout:
raise APIError("Connection to " + url + " timed out.")
except ConnectionError:
raise APIError("API service at " + url + " refused connection.")
except Exception as error:
raise APIError("Failed to call the API service at " + url + ". " +
str(error))
def register_app_with_blockchain():
"""call the conductor service to register this app (sparts catalog) on the supply chain network
"""
data = {
"uuid": "9fb84fa0-1716-4367-7012-61370e23028f",
"api_url": "http://open.windriver.com:5000",
"type": "website",
"label": "Sparts Catalog"
}
if app.config["BYPASS_API_CALLS"]:
return
try:
response = requests.post(API_SERVER + "/app/register", data=json.dumps(data), \
headers={'Content-type': 'application/json'}, timeout=app.config["DEFAULT_API_TIMEOUT"])
except ReadTimeout:
raise APIError("Failed to register app with blockchain. Conductor service timed out")
except ConnectionError:
raise APIError("Failed to register app with blockchain. " \
+ "The conductor service refused connection or is not running.")
if response.status_code != 200:
raise APIError("Failed to register app with blockchain. Server responded with " \
+ "HTTP " + str(response.status_code))
try:
result = response.json()
except:
raise APIError("Failed to register app with blockchain. Invalid JSON return data " \
+ "'" + str(response.content)) + "'"
if "status" not in result:
raise APIError("Failed to register app with blockchain. Invalid JSON return data " \
+ ": Missing required field 'status'.")
if result["status"] != "success":
raise APIError("Failed to register app with blockchain. Server returned status '" \
+ str(result["status"]) + "'.")
def call_blockchain_api(method, url, data={}):
""" call the blockchain ledger service with the given method (post or get), url, and data.
"""
if app.config["BYPASS_API_CALLS"]:
return {}
bc_server_ip, bc_server_port = get_ledger_api_address()
request_url = "http://" + bc_server_ip + ":" + str(bc_server_port) + "/api/sparts" + url
print("[" + method + "] " + request_url)
result = None
try:
if method == "get":
result = requests.get(request_url, params=data, timeout=app.config["DEFAULT_API_TIMEOUT"])
elif method == "post":
result = requests.post(request_url, data=json.dumps(data), \
headers={'Content-type': 'application/json'}, timeout=app.config["DEFAULT_API_TIMEOUT"])
else:
raise APIError("Bad method passed to function 'call_blockchain_api")
except ReadTimeout:
raise APIError("Blockchain ledger service timed out.")
except ConnectionError:
raise APIError("Blockchain ledger service refused connection.")
if result.status_code != 200:
raise APIError("The blockchain API server responeded with HTTP " + \
str(result.status_code) + ".")
# hack to bypass invalid JSON value when blockchain is empty
if result.content == "[{[]}]":
return []
json_result = None
try:
json_result = result.json()
except:
raise APIError("Failed to parse the following JSON data in the response of the blockchain" \
+" API server.<br><br><pre>" + str(result.content) + "</pre>")
if "status" in json_result:
# raise APIError("Invalid JSON in the response of the ledger service at " + url \
# + "Missing required field 'status'")
if json_result["status"] == "failed":
if "error_message" in json_result:
raise APIError("Leger service call to '" + url + "' failed. " \
+ "The API server provided the following reason: '" \
+ json_result["error_message"] + "'.")
else:
raise APIError("Leger service call to '" + url + "' failed." + \
"No error_message was provided by the server.")
if json_result["status"] != "success":
raise APIError("Leger service call to '" + url + "' returned 'status' = '" \
+ json_result["status"] + "'.")
return json_result