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#!/usr/bin/python3
import sys, re, sqlite3, json
import os.path
from http.server import HTTPServer, BaseHTTPRequestHandler
import urllib.parse
hostname = "localhost"
port = 8000
dbFile = "data/data.db"
imgDir = "../public/img/"
NODE_REQ_DEPTH = 1
# For a /node?name=name1 request, respond with name1's node, and descendent nodes in a subtree to some depth > 0
usageInfo = f"usage: {sys.argv[0]}\n"
usageInfo += "Starts a server that listens for GET requests to http://" + hostname + ":" + str(port) + ".\n"
usageInfo += "Responds to path+query /data/type1?name=name1 with JSON data.\n"
usageInfo += "\n"
usageInfo += "If type1 is 'node': \n"
usageInfo += " Responds with a map from names to node objects, representing\n"
usageInfo += " nodes name1, and child nodes up to depth " + str(NODE_REQ_DEPTH) + ".\n"
usageInfo += "If type1 is 'children': Like 'node', but excludes node name1.\n"
usageInfo += "If type1 is 'chain': Like 'node', but gets nodes from name1 up to the root, and their direct children.\n"
usageInfo += "If type1 is 'search': Responds with a tolnode name that has alt-name name1, or null.\n"
if len(sys.argv) > 1:
print(usageInfo, file=sys.stderr)
sys.exit(1)
dbCon = sqlite3.connect(dbFile)
def lookupNode(name):
# Get from db
cur = dbCon.cursor()
cur.execute("SELECT name, data FROM nodes WHERE name = ?", (name,))
row = cur.fetchone()
if row == None:
return None
nodeObj = json.loads(row[1])
# Check for image file
match = re.fullmatch(r"\[(.+) \+ (.+)]", name)
if match == None:
nodeObj["imgFile"] = nodeNameToFile(name, cur)
else:
nodeObj["imgFile"] = nodeNameToFile(match.group(1), cur)
if nodeObj["imgFile"] == None:
nodeObj["imgFile"] = nodeNameToFile(match.group(2), cur)
return nodeObj;
def nodeNameToFile(name, cur):
row = cur.execute("SELECT name, eol_id FROM names WHERE name = ?", (name,)).fetchone()
if row == None:
return None
imgFile = str(row[1]) + ".jpg"
if not os.path.exists(imgDir + imgFile):
return None
return imgFile
def lookupName(name):
cur = dbCon.cursor()
cur.execute("SELECT name, alt_name FROM names WHERE alt_name = ?", (name,))
row = cur.fetchone()
return json.dumps(row[0]) if row != None else None
class DbServer(BaseHTTPRequestHandler):
def do_GET(self):
# Parse URL
urlParts = urllib.parse.urlparse(self.path)
path = urllib.parse.unquote(urlParts.path)
queryDict = urllib.parse.parse_qs(urlParts.query)
# Check first element of path
match = re.match(r"/([^/]+)/(.+)", path)
if match != None and match.group(1) == "data" and "name" in queryDict:
reqType = match.group(2)
name = queryDict["name"][0]
# Check query string
if reqType == "node":
nodeObj = lookupNode(name)
if nodeObj != None:
results = {}
getResultsUntilDepth(name, nodeObj, NODE_REQ_DEPTH, results)
self.respondJson(json.dumps(results))
return
elif reqType == "children":
nodeObj = lookupNode(name)
if nodeObj != None:
results = {}
for childName in nodeObj["children"]:
nodeObj = lookupNode(childName)
if nodeObj != None:
getResultsUntilDepth(childName, nodeObj, NODE_REQ_DEPTH, results)
self.respondJson(json.dumps(results))
return
elif reqType == "chain":
results = {}
ranOnce = False
while True:
# Get node
nodeObj = lookupNode(name)
if nodeObj == None:
if ranOnce:
print("ERROR: Parent-chain node {} not found".format(name), file=sys.stderr)
break
results[name] = nodeObj
# Conditionally add children
if not ranOnce:
ranOnce = True
else:
internalFail = False
for childName in nodeObj["children"]:
if childName in results:
continue
nodeObj = lookupNode(childName)
if nodeObj == None:
print("ERROR: Parent-chain-child node {} not found".format(name), file=sys.stderr)
internalFail = True
break
results[childName] = nodeObj
if internalFail:
break
# Check if root
if nodeObj["parent"] == None:
self.respondJson(json.dumps(results))
return
else:
name = nodeObj["parent"]
elif reqType == "search":
nameJson = lookupName(name)
if nameJson != None:
self.respondJson(nameJson)
return
self.send_response(404)
self.end_headers()
self.end_headers()
def respondJson(self, jsonStr):
self.send_response(200)
self.send_header("Content-type", "application/json")
self.end_headers()
self.wfile.write(jsonStr.encode("utf-8"))
def getResultsUntilDepth(name, nodeObj, depth, results):
"""Given a node [name, nodeObj] pair, adds child node pairs to 'results', up until 'depth'"""
results[name] = nodeObj
if depth > 0:
for childName in nodeObj["children"]:
childObj = lookupNode(childName)
if childObj != None:
getResultsUntilDepth(childName, childObj, depth-1, results)
server = HTTPServer((hostname, port), DbServer)
print("Server started at http://{}:{}".format(hostname, port))
try:
server.serve_forever()
except KeyboardInterrupt:
pass
server.server_close()
dbCon.close()
print("Server stopped")
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