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This is a basic implementation of a dht using gevent.
There are two things you have to concern yourself with. 1.) Bootstrapping the network. The following example creates a network of one node
import gevent_dht table = gevent_dht.distributedHashTable(None) #This tell the network it # is the first node by default it listens on port 8339 #
table['key_1'] = [1,2,3] #This sets a value in our hash table for i in table['key_1']: print i #Prints 123
table.append('key_1', 4) #Adds an item to a list in a hash table #Note if the key is not in the hash table #It will put a list in place and then append #to it.
#Now we are adding another node
other_clients_table = gevent_dht.distributedHashTable( '127.0.0.1:8339', local_port = 8449) #Another client has connected. It supplied the address of # a node in the network to connect with the preexisting network
for i in other_clients_table['key_1']: print i #Prints 1234
So in order to connect to an existing network you must have a way to get an address of another member. It doesn't have to be the first node but needs to be a node in the network.
2.) Latency/ This may fail.
Keys are not guarenteed to persist forever, nodes may crash, the network may eat messages etc... While we are working in tcp/ip mode there may still be bizarre glitches. Always check for a return value of None.
Additionally due to the time it takes for messages to travel the network sometimes a key will not be immedietly available after you set it or when you get the result back it may not be completely current.
FAQs
Gevent based distributed hash table
We found that gevent_dht demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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