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requirements/bittorrent_statusgo_prototype.md
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requirements/bittorrent_statusgo_prototype.md
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# Codex prototype requirements
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## Replacing BitTorrent with Codex in the Community History Service
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The goal of the [community history
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service](https://status.app/specs/status-community-history-service) in Status is
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to ensure that messages older than 30 days are capable of being retrieved by
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ephemeral community members. Currently, control nodes seed message archive
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torrents to the BitTorrent network, and member nodes download the necessary
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message archives using a magnet link. Codex will replace the use of the
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BitTorrent network, by uploading datasets to Codex, and using CIDs for download
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instead of magnet links.
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### The current Community History Service
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Every 7 days, [message
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archives](https://status.app/specs/status-community-history-service#message-history-archives)
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are created by community control nodes and appended to a blob of previous
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archives. This blob, along with a [message history archive index
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file](https://status.app/specs/status-community-history-service#message-history-archive-index)
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("index file") containing metadata about the message archives in the blob, are
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packaged into a single bundle for which a torrent is created and seeded on the
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BitTorrent network. The [magnet link for this
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bundle](https://status.app/specs/status-community-history-service#creating-magnet-links)
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is distributed to community members over a [special, hidden, Status/Waku
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channel](https://status.app/specs/status-community-history-service#message-archive-distribution).
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When community members [first join the community, return online after some time
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offline, or receive a live message history
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update](https://status.app/specs/status-community-history-service#fetching-message-history-archives),
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the latest magnet link is parsed from the special channel and any missing
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message archives in the latest set of archives are downloaded. In effect,
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message archives are replicated across all community member nodes.
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### Codex's replacement of BitTorrent in the Community History Service
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Codex must replace the use of the BitTorrent network in this process, which is
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currently [implemented in
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`status-go`](https://github.com/status-im/status-go/blob/6322f22783585474803cfc8a6f0a914757d763b5/protocol/messenger_communities.go#L3783).
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To achieve this, the index file and all message archives will have their own CID
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and will be uploaded to the Codex network separately. This differs from the
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current implementation where the message archive bundle has [a single
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torrent](https://status.app/specs/status-community-history-service#creating-message-archive-torrents)
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and [magnet
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link](https://status.app/specs/status-community-history-service#creating-magnet-links);
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now, the index file and its constituent archives will be split out and uploaded
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to the Codex network separately, each with their own CIDs.
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The [design proposal](https://hackmd.io/SdVRXfnTQ_uedz_N7DeFqg) describes
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distribution and download well:
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> Instead of the magnet link, the community owner only publishes [the] `index`
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CID [in the special channel].
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>
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> In order to receive the historical messages for the given period (given by
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`from` and `to` in the `WakuMessageArchiveMetadata`), the receiving node first
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acquires the `index` using the `index` CID. For each entry in the `index` that
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the node has interest in, the node then downloads the corresponding archive
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directly using the `Cid` from this `index` entry.
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>
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> The diagram below shows the relationship between the new `index` identified by
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a Codex CID that uses individual CIDs to refer to each individual archive:
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### Message archive size
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The size of the message archives will be dependent upon the activity in each
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community. It remains unclear what the average size of current message
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archives are, however an upper bound should be established.
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It was reported that when the Community History Service was first implemented to
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export Discord messages, the message archive was **10GB**, which we assume is
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the upper bound of message archive dataset size because $i)$ the archive was not
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limited to 7 days of Discord history (it was the *entire* history), $ii)$ the
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community already had an established history on Discord compared to newer
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communities on Status, and $iii)$ it stands to reason that usage on Discord was
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greater than on Status due to platform network effect, different UX, and member
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churn during the transition.
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## FURPs requirements
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It should be noted that these requirements represent a *prototype* of the
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replacement of BitTorrent in the Community History Service only. These
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requirements will need to be redefined as Codex moves away from a service to
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Status and into its own protocol.
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### Functionality
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1. Ability to transfer datasets of at least 10GB between two or more nodes.
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2. Datasets must be represented with a verifiable CID for data integrity.
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3. All community members must be a Codex node and must be a provider of datasets.
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4. Providers of datasets must be discoverable by querying for a CID.
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5. Uploaded or downloaded datasets must be downloadable by peers.
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6. `index` files must have their own CID.
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7. Message archive files must have their own CID.
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8. [`WakuMessageArchiveIndexMetadata`](https://status.app/specs/status-community-history-service#wakumessagearchiveindex) must contain a CID of a message archive.
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### Usability
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1. Functionality to upload and download should be exposed over a REST API or
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available through Go-bindings.
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### Reliability
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1. Once a dataset is uploaded, the dataset should be retrievable by any
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member of the community.
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2. Once a dataset is uploaded, at least one seeder of the dataset must remain
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online so the dataset is retrievable.
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### Performance
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1. As soon as a dataset is downloaded, there should be no delay in availability
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of the dataset to peers.
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### Supportability
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1. Nodes behind a NAT should be able to connect peers in a community.
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