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# Computercraft Storage Network
This is an implementation of a centralized storage network architecture that uses just ComputerCraft and vanilla Minecraft.
## Deployment
A GPS will need to be established and be accurate within range of the entire network to the block.
## Communication Protocol
Port 42914 is used for Master => Slave broadcasting
Port 42915 is used for Slave => Master return broadcasting
### Packet Format
Packet format is uniform between master <-> slaves and is structured like so:
```
{
// Metadata
magic: str("ccstoragenet")
networkid: int()
sourceid: int()
destid: int()
// Payload
type: str()
// Optional Arguments
itemname: str()
itemquant: int()
destination: int()
location: [int(),int(),int()]
}
```
| Name | Required? | Type | Description
| :-- | :--: | :-- | :--
| `magic` | true | string | Must be `ccstoragenet`. If it is not, the packet is immediately discarded |
| `networkid` | true | int | The ID of the network |
| `sourceid` | true | int | The CC ID of the machine sending the packet |
| `destid` | true | int | The CC ID of the intended recipient of the packet |
| `type` | true | string | An arbitrary string literal corresponding to the type of the request. Common examplse include `ping`, `query`, etc. |
| `itemname` | false | string | The unlocalized name of an item. Used for querying, crafting, movement, etc. |
| `itemquant` | false | int | Quantity of the aforementioned item |
| `destination` | false | int | The CC ID of the intended recipient of the item |
### Slave Node Initialization
* The slave starts up
* The slave receives a `ping` packet from a master server. The slave compares it to any stored `/pairednetwork` file in the root of the filesystem:
* If the file exists and the ID does not match, processing is halted
* The `networkid` of the packet is stored as `/pairednetwork`
* The slave responds with a `pong` packet.
### Master Node Initialization
* The master node starts up
* The master node sends a packet with type `ping` and `networkid` initialized to its CC ID.
* The master node listens for `pong` packets for a configurable timeout.
* The `sourceid` of all `pong` packets is recorded for statistics displays. This cached data is only used for user display. Node availability is evaluated at request time.
### Inventory Search (query)
* A sender node (master or slave) sends out a `ping`
* All available slaves respond with `pong`
* The sender node sends a packet with type `query`. Field `itemname` is populated with an item to query for.
* Each available slave responds with type `query`.
* `itemname` is populated with data from the previous packet
* `itemquantity` is populated with the quantity of that item attached to storages the slave has access to.
* The requester waits for a response from each slave that responded to the `ping` or until a configurable timeout is reached.
* Results are consumed