148 lines
6.2 KiB
Markdown
148 lines
6.2 KiB
Markdown
---
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sidebar_position: 1
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description: Codex is building a decentralised durability storage engine
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---
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# How to Use Codex
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> The Codex project aims to create a decentralised durability engine that allows persisting data in p2p networks. In other words, it allows storing files and data with predictable durability guarantees for later retrieval.
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> WARNING: This project is under active development and is considered pre-alpha.
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[](https://opensource.org/licenses/Apache-2.0)
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[](https://opensource.org/licenses/MIT)
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[](#stability)
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[](https://github.com/status-im/nim-codex/actions?query=workflow%3ACI+branch%3Amain)
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[](https://codecov.io/gh/status-im/nim-codex)
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[](https://discord.gg/CaJTh24ddQ)
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## Build and run
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For detailed instructions on preparing to build nim-codex see [*Building Codex*](BUILDING.md).
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To build the project, clone it, and run:
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```bash
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make update && make exec
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```
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The executable will be placed under the `build` directory under the project root.
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Run the client with:
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```bash
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build/codex
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```
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### CLI options
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```
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build/codex --help
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Usage:
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codex [OPTIONS]... command
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The following options are available:
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--log-level Sets the log level [=LogLevel.INFO].
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--metrics Enable the metrics server [=false].
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--metrics-address Listening address of the metrics server [=127.0.0.1].
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--metrics-port Listening HTTP port of the metrics server [=8008].
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-d, --data-dir The directory where codex will store configuration and data..
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-l, --listen-port Specifies one or more listening ports for the node to listen on. [=0].
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-i, --listen-ip The public IP [=0.0.0.0].
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--udp-port Specify the discovery (UDP) port [=8090].
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--net-privkey Source of network (secp256k1) private key file (random|<path>) [=random].
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-b, --bootstrap-node Specifies one or more bootstrap nodes to use when connecting to the network..
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--max-peers The maximum number of peers to connect to [=160].
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--agent-string Node agent string which is used as identifier in network [=Codex].
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-p, --api-port The REST Api port [=8080].
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-c, --cache-size The size in MiB of the block cache, 0 disables the cache [=100].
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--persistence Enables persistence mechanism, requires an Ethereum node [=false].
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--eth-provider The URL of the JSON-RPC API of the Ethereum node [=ws://localhost:8545].
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--eth-account The Ethereum account that is used for storage contracts [=EthAddress.none].
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--eth-deployment The json file describing the contract deployment [=string.none].
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Available sub-commands:
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codex initNode
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```
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### Example: Running two Codex clients
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```bash
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build/codex --data-dir="$(pwd)/Codex1" -i=127.0.0.1
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```
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This will start Codex with a data directory pointing to `Codex1` under the current execution directory and announce itself on the DHT under `127.0.0.1`.
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To run a second client that automatically discovers nodes on the network, we need to get the Signed Peer Record (SPR) of first client, Client1. We can do this by querying the `/info` endpoint of the node's REST API.
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`curl http://127.0.0.1:8080/api/codex/v1/info`
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This should output information about Client1, including its PeerID, TCP/UDP addresses, data directory, and SPR:
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```json
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{
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"id": "16Uiu2HAm92LGXYTuhtLaZzkFnsCx6FFJsNmswK6o9oPXFbSKHQEa",
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"addrs": [
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"/ip4/0.0.0.0/udp/8090",
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"/ip4/0.0.0.0/tcp/49336"
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],
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"repo": "/repos/status-im/nim-codex/Codex1",
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"spr": "spr:CiUIAhIhAmqg5fVU2yxPStLdUOWgwrkWZMHW2MHf6i6l8IjA4tssEgIDARpICicAJQgCEiECaqDl9VTbLE9K0t1Q5aDCuRZkwdbYwd_qLqXwiMDi2ywQ5v2VlAYaCwoJBH8AAAGRAh-aGgoKCAR_AAABBts3KkcwRQIhAPOKl38CviplVbMVnA_9q3N1K_nk5oGuNp7DWeOqiJzzAiATQ2acPyQvPxLU9YS-TiVo4RUXndRcwMFMX2Yjhw8k3A"
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}
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```
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Now, let's start a second client, Client2. Because we're already using the default ports TCP (:8080) and UDP (:8090) for the first client, we have to specify new ports to avoid a collision. Additionally, we can specify the SPR from Client1 as the bootstrap node for discovery purposes, allowing Client2 to determine where content is located in the network.
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```bash
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build/codex --data-dir="$(pwd)/Codex2" -i=127.0.0.1 --api-port=8081 --udp-port=8091 --bootstrap-node=spr:CiUIAhIhAmqg5fVU2yxPStLdUOWgwrkWZMHW2MHf6i6l8IjA4tssEgIDARpICicAJQgCEiECaqDl9VTbLE9K0t1Q5aDCuRZkwdbYwd_qLqXwiMDi2ywQ5v2VlAYaCwoJBH8AAAGRAh-aGgoKCAR_AAABBts3KkcwRQIhAPOKl38CviplVbMVnA_9q3N1K_nk5oGuNp7DWeOqiJzzAiATQ2acPyQvPxLU9YS-TiVo4RUXndRcwMFMX2Yjhw8k3A
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```
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There are now two clients running. We could upload a file to Client1 and download that file (given its CID) using Client2, by using the clients' REST API.
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## Interacting with the client
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The client exposes a REST API that can be used to interact with the clients. These commands could be invoked with any HTTP client, however the following endpoints assume the use of the `curl` command.
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### `/api/codex/v1/connect/{peerId}`
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Connect to a peer identified by its peer id. Takes an optional `addrs` parameter with a list of valid [multiaddresses](https://multiformats.io/multiaddr/). If `addrs` is absent, the peer will be discovered over the DHT.
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Example:
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```bash
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curl "127.0.0.1:8080/api/codex/v1/connect/<peer id>?addrs=<multiaddress>"
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```
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### `/api/codex/v1/download/{id}`
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Download data identified by a `Cid`.
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Example:
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```bash
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curl -vvv "127.0.0.1:8080/api/codex/v1/download/<Cid of the content>" --output <name of output file>
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```
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### `/api/codex/v1/upload`
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Upload a file, upon success returns the `Cid` of the uploaded file.
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Example:
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```bash
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curl -vvv -H "content-type: application/octet-stream" -H Expect: -T "<path to file>" "127.0.0.1:8080/api/codex/v1/upload" -X POST
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```
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### `/api/codex/v1/info`
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Get useful node info such as its peer id, address, and SPR.
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Example:
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```bash
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curl -vvv "127.0.0.1:8080/api/codex/v1/info"
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```
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