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docs: add IPFS Architecture Diagram (#1673)
* docs: add IPFS Architecture Diagram * docs: apply review to arch diagram
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Diff for: ‎README.md

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http://localhost:5002/debug/metrics/prometheus
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```
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### IPFS Core Architecture
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### IPFS Architecture
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![](/img/core.png)
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![](/img/architecture.png)
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[Annotated version](https://user-images.githubusercontent.com/1211152/47606420-b6265780-da13-11e8-923b-b365a8534e0e.png)j
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What does this image explain?
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- IPFS uses `ipfs-repo` which picks `fs` or `indexeddb` as its storage drivers, depending if it is running in Node.js or in the Browser.
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- The exchange protocol, `bitswap`, uses the Block Service which in turn uses the Repo, offering a get and put of blocks to the IPFS implementation.
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- The DAG API (previously Object) comes from the IPLD Resolver, it can support several IPLD Formats (i.e: dag-pb, dag-cbor, etc).
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- The Files API uses `ipfs-unixfs-engine` to import and export files to and from IPFS.
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- Swarm, the component that offers a network API, uses libp2p to dial and listen for connections, to use the DHT, for discovery mechanisms, and more. libp2p-ipfs-nodejs is used when running in Node.js and libp2p-ipfs-browser is used when running in the browser.
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- libp2p, the network stack of IPFS, uses libp2p to dial and listen for connections, to use the DHT, for discovery mechanisms, and more.
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## Contribute
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Diff for: ‎examples/README.md

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In this section, you will find explanations to different pieces of IPFS Architecture and how `js-ipfs` implements them.
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![](../img/core.png)
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![](../img/architecture.png)
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[Annotated version](https://user-images.githubusercontent.com/1211152/47606420-b6265780-da13-11e8-923b-b365a8534e0e.png)
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> These explanations are still a work in progress
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┌─────────────────────────────────────────────────────────────────────────────┐
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│ The IPFS Architecture │
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└─────────────────────────────────────────────────────────────────────────────┘
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┏━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━
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======================= IPFS Daemon ======================= ┃
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┃ ┃
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┃┌────┐ ┏ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━
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│ │ ++++++++++++++++++ IPFS Core ++++++++++++++++++ ┃
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│ │ ┃ ┌──────────────────────────────────────────────────┐
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│HTTP│ ┌─│ API (Core API) │ ┃┃
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┃│Gate│ │ ├──────┬──────┬──────┬──────┬──────┬───────┬───────┤ ┃
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┃│way │◀┤ │ Repo │Block │ DAG │ Pin │Files │ │Network│ ┃
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│ │ │ └──────┴──────┴──────┴──────┴──────┘ └───────┘
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│ │ │ │ │ │ │ │ │ ┃
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│ │ │ │ │ ┌────┘ │ ┌────┘ ┌────┘ ┃
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┃└────┘ │ ┌──┘ │ │ ┌──────┘ │ ▼ ┃┃
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┃ │ │┌────────┘ │ ▼ ▼ ┌────────────────────┐
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┌────┐ │ ││ │┌───────┐┌──────┐│ libp2p │┃
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│ │ │ ││ ││Pinning││Unixfs││ (Network, PubSub, │
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│ │ │ ││ ││Service││Engine││ Swarm, Crypto) │┃┃
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┃│ │ │ ││ │└───────┘└──────┘│┌──────────────────┐│ ┃
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┃│HTTP│ │ ││ │ │ │ ││Connection Manager││┃
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│RPC │ │ ││ ├────┴────────┘ │└──────────────────┘│
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┌───┐┌────────┐ │API │◀┘ ││ │ │┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ │┃
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│CLI││ipfs-api│ │ │ ┃ ││ │ │ Peer Reputation ││ ┃
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└───┘└────────┘┃│ │ ││ │ │└ ─ ─ ─ ─ ─ ─ ─ ─ ─ │┃┃
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┃│ │ ┃ ││ ┌──┘ └────────────────────┘
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│ │ ││ │ ┌ ─ ─ ─ ─ ┐┌ ─ ─ ─ ─ ─ ┃
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└────┘ ┃ ││ │ Providers GC │
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││ ▼ │ Service ││ ┃┃
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┃ ┃ ││┌─────────────┐ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘ ┃
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┃ │││Graph Service│─────┬───────────┬───────────┐ ┃
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┃ ││└─────────────┘ ▼ ▼ ▼
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││ │ ┌ ─ ─ ─ ─ ─ ┌ ─ ─ ─ ─ ─ ┌ ─ ─ ─ ─ ─ ┃
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┃ │└───────┤ GraphSync │ GraphSyncB│ GraphSyncC│ ┃
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┃ │ ▼ └ ─ ─ ─ ─ ─ └ ─ ─ ─ ─ ─ └ ─ ─ ─ ─ ─ ┃┃
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┃ ┃ │ ┌─────────────┐
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│ │Block Service│─────┬───────────┬───────────┐ ┃
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┃ │ └─────────────┘ ▼ ▼ ▼
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│ │ ┌──────────┐┌ ─ ─ ─ ─ ─ ┌ ─ ─ ─ ─ ─ ┃┃
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┃ ┃ └─────┬──┴──────│ Bitswap │ BitswapB │ BitswapB │ ┃
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┃ ▼ └──────────┘└ ─ ─ ─ ─ ─ └ ─ ─ ─ ─ ─ ┃
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┃ ┌─────────┐
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│ Repo │ ┃
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┃ └─────────┘ ┃
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┃ │ ┃┃
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┃ ┃ ┌─┴──────┬──────────┬───────┐
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▼ ▼ ▼ ▼ ┃
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┃ ┌────┐┌──────────┐┌────────┐┌────┐
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│ fs ││indexedDB ││LevelDB ││ S3 │ ┃┃
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┃ ┃ └────┘└──────────┘└────────┘└────┘ ┃
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┃ ┃
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┗ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━
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━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━ ━━
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┌───────────────────────────────────────────────────────────────────────────┐
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│ Legend │
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│ ┌ ─ ─ ┐ │
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│ Planned, not yet implemented │
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│ └ ─ ─ ┘ │
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│ ┌─────┐ │
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│ │ │ Exist and shipped with IPFS │
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│ └─────┘ │
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└───────────────────────────────────────────────────────────────────────────┘

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