docs(lightwalletd): add a lightwalletd tutorial (#4526)
* add a lightwalletd tutorial * apply simplifications Co-authored-by: teor <teor@riseup.net> * change `zebra.toml` location * update go installation * remove optional config sections * remove nginx section * use another location for `lightwalletd` binary * change `lightwalletd` start command * typo * change sentence * improve run the wallet command * remove space Co-authored-by: teor <teor@riseup.net>
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Alfredo Garcia
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- [Running Zebra](user/run.md)
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- [Tracing Zebra](user/tracing.md)
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- [Zebra Metrics](user/metrics.md)
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- [Lightwalletd](user/lightwalletd.md)
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- [Developer Documentation](dev.md)
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- [Contribution Guide](CONTRIBUTING.md)
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- [Design Overview](dev/overview.md)
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# Running lightwalletd with zebra
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Starting on [v1.0.0-beta.11](https://github.com/ZcashFoundation/zebra/releases/tag/v1.0.0-beta.11), the Zebra RPC methods are fully featured to run a lightwalletd service backed by zebrad.
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Contents:
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- [Download and build Zebra](#download-and-build-zebra)
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- [Configure zebra for lightwalletd](#configure-zebra-for-lightwalletd)
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- [RPC section](#rpc-section)
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- [Sync Zebra](#sync-zebra)
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- [Download and build lightwalletd](#download-and-build-lightwalletd)
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- [Sync lightwalled](#sync-lightwalled)
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- [Run tests](#run-tests)
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- [Connect wallet to lightwalletd](#connect-wallet-to-lightwalletd)
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- [Download and build the cli-wallet](#download-and-build-the-cli-wallet)
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- [Run the wallet](#run-the-wallet)
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## Download and build Zebra
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[#download-and-build-zebra]: #download-and-build-zebra
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```console
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cargo install --locked --git https://github.com/ZcashFoundation/zebra zebrad
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```
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Zebra binary will be at ` ~/.cargo/bin/zebrad`.
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## Configure zebra for lightwalletd
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[#configure-zebra-for-lightwalletd]: #configure-zebra-for-lightwalletd
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We need a zebra configuration file. First, we create a file with the default settings:
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```console
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zebrad generate -o ~/.config/zebrad.toml
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```
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The above command places the generated `zebrad.toml` config file in the default preferences directory of Linux. For other OSes default locations [see here](https://docs.rs/dirs/latest/dirs/fn.preference_dir.html).
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Tweak the following option in order to prepare for lightwalletd setup.
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### RPC section
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[#rpc-section]: #rpc-section
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This change is required for zebra to behave as an RPC endpoint. The standard port for RPC endpoint is `8232`.
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```
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[rpc]
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listen_addr = "127.0.0.1:8232"
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```
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## Sync Zebra
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[#sync-zebra]: #sync-zebra
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With the configuration in place you can start synchronizing Zebra with the Zcash blockchain. This may take a while depending on your hardware.
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```console
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zebrad start
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```
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Zebra will display information about sync process:
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```console
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...
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zebrad::commands::start: estimated progress to chain tip sync_percent=10.783 %
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...
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```
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Until eventually it will get there:
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```console
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...
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zebrad::commands::start: finished initial sync to chain tip, using gossiped blocks sync_percent=100.000 %
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...
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```
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You can interrupt the process at any time with `ctrl-c` and Zebra will resume the next time at around the block you were downloading when stopping the process.
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When deploying for production infrastructure, the above command can/should be implemented as a server service or similar configuration.
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For implementing zebra as a service please see [here](https://github.com/ZcashFoundation/zebra/blob/main/zebrad/systemd/zebrad.service).
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## Download and build lightwalletd
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[#download-and-build-lightwalletd]: #download-and-build-lightwalletd
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While you synchronize Zebra you can install lightwalletd. There are several versions of lightwalletd in different repositories:
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- [The original version](https://github.com/zcash/lightwalletd)
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- [The version used by zecwallet-lite and zecwallet-cli](https://github.com/adityapk00/lightwalletd)
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Most of the testing related to Zebra and lightwalletd was done with the zecwallet version in the [adityapk00](https://github.com/adityapk00) repository.
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Before installing lightwalletd, you need to have `go` in place. Please visit the [go install page](https://go.dev/doc/install) with download and installation instructions.
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With go installed and in your path, download and install lightwalletd:
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```console
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git clone https://github.com/adityapk00/lightwalletd
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cd lightwalletd
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make
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make install
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```
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If everything went good you should have a `lightwalletd` binary in `~/go/bin/`.
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## Sync lightwalled
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[#sync-lightwalletd]: (#sync-lightwalletd)
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Please make sure you have zebrad running (with RPC endpoint and up to date blockchain) to synchronize lightwalletd.
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- `lightwalletd` requires a `zcash.conf` file located somewhere, however this file can be empty if you are using the default zebra rpc endpoint (`127.0.0.1:8232`).
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- For production setups `lightwalletd` requires a `cert.pem`. For more information on how to do this please [see here](https://github.com/zcash/lightwalletd#production-usage).
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- `lightwalletd` can run without the certificate (with the `-no-tls-very-insecure` flag) however this is not recommended for production environments.
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With the cert in `./` and an empty `zcash.conf` we can start the sync with:
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```console
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lightwalletd --zcash-conf-path ~/.config/zebra/zcash.conf --data-dir ~/.cache/lightwalletd --log-file /dev/stdout
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```
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By default lightwalletd service will listen on `127.0.0.1:9067`
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Lightwalletd will do its own synchronization, while it is doing you will see messages as:
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```console
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...
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{"app":"lightwalletd","level":"info","msg":"Ingestor adding block to cache: 748000","time":"2022-05-28T19:25:49-03:00"}
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{"app":"lightwalletd","level":"info","msg":"Ingestor adding block to cache: 749540","time":"2022-05-28T19:25:53-03:00"}
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{"app":"lightwalletd","level":"info","msg":"Ingestor adding block to cache: 751074","time":"2022-05-28T19:25:57-03:00"}
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...
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```
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Wait until lightwalletd is in sync before connecting any wallet into it. You will know when it is in sync as those messages will not be displayed anymore.
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## Run tests
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[#run-tests]: (#run-tests)
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The Zebra team created tests for the interaction of zebra and lightwalletd.
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Please refer to [acceptance](https://github.com/ZcashFoundation/zebra/blob/main/zebrad/tests/acceptance.rs) tests documentation in the `Lightwalletd tests` section.
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## Connect a wallet to lightwalletd
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[#connect-wallet-to-lightwalletd]: (#connect-wallet-to-lightwalletd)
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The final goal is to connect wallets to the lightwalletd service backed by Zebra.
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For demo purposes we use [zecwallet-cli](https://github.com/adityapk00/zecwallet-light-cli).
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Make sure both `zebrad` and `lightwalletd` are running and listening.
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### Download and build the cli-wallet
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[#download-and-build-the-cli-wallet]: (#download-and-build-the-cli-wallet)
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```console
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cargo install --locked --git https://github.com/adityapk00/zecwallet-light-cli
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```
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zecwallet-cli binary will be at `~/.cargo/bin/zecwallet-cli`.
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### Run the wallet
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[#run-the-wallet]: (#run-the-wallet)
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```console
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$ zecwallet-cli --server 127.0.0.1:9067
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Lightclient connecting to http://127.0.0.1:9067/
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{
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"result": "success",
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"latest_block": 1683911,
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"total_blocks_synced": 49476
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}
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Ready!
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(main) Block:1683911 (type 'help') >>
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```
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