fcs.server.graph_db¶

This module describes API for graph database, used by GraphAndBTreeDB in fcs.server.link_db.

class GraphDB(location)¶

Class provides easy access to Neo4j database.

Parameters:	location (string) – Location of database.

is_in_base(link)¶

Checks if the given link is already in database.

Parameters:	link (string) – Searched link.
Returns:	Information if the link is in database.
Return type:	bool

change_link_priority(link, priority)¶

Changes link priority.

Parameters:	link (string) – URL with priority modified. priority (int) – Link’s new priority.
Returns:	Link’s old priority.
Return type:	int

get_details(link)¶

Returns information stored in database about specified link.

Raises Exception:
Parameters:	link (string) – URL with priority modified.
Returns:	List with 3 strings - priority, fetch date(could be empty string) and depth.
Return type:	list
	if link has not been found in databse

add_link(link, priority, depth)¶

Adds given link to database.

Parameters:	link (string) – URL to add. priority (int) – Link priority. depth (int) – Link depth.
Returns:	Object representing new node in database.
Return type:	neo4j.Nodes if successful, None otherwise

set_as_fetched(link)¶

Sets time of page processing ending.

Parameters:	link (string) – URL.

points(url_a, url_b)¶

Connects two URLs-representing nodes in graph with relationship: “url_b obtained from page identified with url_a”.

Parameters:	url_a (string) – First URL. url_b (string) – Second URL.
Returns:	Object representing edge between nodes representing url_a and url_b.
Return type:	neo4j.Relationships

get_connected(links)¶

Provides list of URLs which can be extracted from specified pages.

Parameters:	links (list) – List of strings representing URLs.
Returns:	List of URLs (as strings).
Return type:	list