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Merge pull request #4236 from guggero/grpc-docs

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docs: update instructions for JavaScript and Python on how to use gRPC
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Olaoluwa Osuntokun 2020-05-08 16:13:45 -07:00 committed by GitHub
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150
docs/grpc/javascript.md
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@ -1,15 +1,16 @@
# How to write a simple `lnd` client in Javascript using `node.js`
### Setup and Installation
## Setup and Installation
First, you'll need to initialize a simple nodejs project:
```
npm init (or npm init -f if you want to use the default values without prompt)
```
Then you need to install the Javascript grpc library dependency:
Then you need to install the Javascript grpc and proto loader library
dependencies:
```
npm install grpc --save
npm install grpc @grpc/proto-loader --save
```
You also need to copy the `lnd` `rpc.proto` file in your project directory (or
@ -18,47 +19,55 @@ at least somewhere reachable by your Javascript code).
The `rpc.proto` file is [located in the `lnrpc` directory of the `lnd`
sources](https://github.com/lightningnetwork/lnd/blob/master/lnrpc/rpc.proto).
In order for the auto-generated code to compile successfully, you'll need to
comment out the following line:
```
//import "google/api/annotations.proto";
```
#### Imports and Client
### Imports and Client
Every time you work with Javascript gRPC, you will have to import `grpc`, load
`rpc.proto`, and create a connection to your client like so:
```js
var grpc = require('grpc');
var fs = require("fs");
const grpc = require('grpc');
const protoLoader = require('@grpc/proto-loader');
const fs = require("fs");
// Due to updated ECDSA generated tls.cert we need to let gprc know that
// we need to use that cipher suite otherwise there will be a handhsake
// error when we communicate with the lnd rpc server.
process.env.GRPC_SSL_CIPHER_SUITES = 'HIGH+ECDSA'
// We need to give the proto loader some extra options, otherwise the code won't
// fully work with lnd.
const loaderOptions = {
keepCase: true,
longs: String,
enums: String,
defaults: true,
oneofs: true
};
const packageDefinition = protoLoader.loadSync('rpc.proto', loaderOptions);
// Lnd cert is at ~/.lnd/tls.cert on Linux and
// ~/Library/Application Support/Lnd/tls.cert on Mac
var lndCert = fs.readFileSync("~/.lnd/tls.cert");
var credentials = grpc.credentials.createSsl(lndCert);
var lnrpcDescriptor = grpc.load("rpc.proto");
var lnrpc = lnrpcDescriptor.lnrpc;
var lightning = new lnrpc.Lightning('localhost:10009', credentials);
let lndCert = fs.readFileSync("~/.lnd/tls.cert");
let credentials = grpc.credentials.createSsl(lndCert);
let lnrpcDescriptor = grpc.loadPackageDefinition(packageDefinition);
let lnrpc = lnrpcDescriptor.lnrpc;
let lightning = new lnrpc.Lightning('localhost:10009', credentials);
```
### Examples
## Examples
Let's walk through some examples of Javascript gRPC clients. These examples
assume that you have at least two `lnd` nodes running, the RPC location of one
of which is at the default `localhost:10009`, with an open channel between the
two nodes.
#### Simple RPC
### Simple RPC
```js
> lightning.getInfo({}, function(err, response) {
lightning.getInfo({}, function(err, response) {
if (err) {
console.log('Error: ' + err);
}
console.log('GetInfo:', response);
});
```
@ -79,10 +88,10 @@ GetInfo: { identity_pubkey: '03c892e3f3f077ea1e381c081abb36491a2502bc43ed37ffb82
chains: [ 'bitcoin' ] }
```
#### Response-streaming RPC
### Response-streaming RPC
```js
var call = lightning.subscribeInvoices({});
let call = lightning.subscribeInvoices({});
call.on('data', function(invoice) {
console.log(invoice);
})
@ -108,7 +117,7 @@ $ lncli sendpayment --pay_req=<PAYMENT_REQUEST>
Your Javascript console should now display the details of the recently satisfied
invoice.
#### Bidirectional-streaming RPC
### Bidirectional-streaming RPC
This example has a few dependencies:
```shell
@ -120,15 +129,15 @@ You can run the following in your shell or put it in a program and run it like
```js
// Load some libraries specific to this example
var async = require('async');
var _ = require('lodash');
var ByteBuffer = require('bytebuffer');
const async = require('async');
const _ = require('lodash');
const ByteBuffer = require('bytebuffer');
var dest_pubkey = <RECEIVER_ID_PUBKEY>;
var dest_pubkey_bytes = ByteBuffer.fromHex(dest_pubkey);
let dest_pubkey = <RECEIVER_ID_PUBKEY>;
let dest_pubkey_bytes = ByteBuffer.fromHex(dest_pubkey);
// Set a listener on the bidirectional stream
var call = lightning.sendPayment();
let call = lightning.sendPayment();
call.on('data', function(payment) {
console.log("Payment sent:");
console.log(payment);
@ -153,8 +162,8 @@ function paymentSender(destination, amount) {
_.delay(callback, 2000);
};
}
var payment_senders = [];
for (var i = 0; i < 10; i++) {
let payment_senders = [];
for (let i = 0; i < 10; i++) {
payment_senders[i] = paymentSender(dest_pubkey_bytes, 100);
}
async.series(payment_senders, function() {
@ -165,67 +174,62 @@ async.series(payment_senders, function() {
This example will send a payment of 100 satoshis every 2 seconds.
#### Using Macaroons
### Using Macaroons
To authenticate using macaroons you need to include the macaroon in the metadata of the request.
To authenticate using macaroons you need to include the macaroon in the metadata
of each request.
The following snippet will add the macaroon to every request automatically:
```js
var fs = require('fs');
var grpc = require('grpc');
const fs = require('fs');
const grpc = require('grpc');
const protoLoader = require('@grpc/proto-loader');
const loaderOptions = {
keepCase: true,
longs: String,
enums: String,
defaults: true,
oneofs: true
};
const packageDefinition = protoLoader.loadSync('rpc.proto', loaderOptions);
process.env.GRPC_SSL_CIPHER_SUITES = 'HIGH+ECDSA'
// Lnd admin macaroon is at ~/.lnd/data/chain/bitcoin/simnet/admin.macaroon on Linux and
// ~/Library/Application Support/Lnd/data/chain/bitcoin/simnet/admin.macaroon on Mac
var m = fs.readFileSync('~/.lnd/data/chain/bitcoin/simnet/admin.macaroon');
var macaroon = m.toString('hex');
var meta = new grpc.Metadata().add('macaroon', macaroon);
var lnrpcDescriptor = grpc.load("rpc.proto");
var lnrpc = lnrpcDescriptor.lnrpc;
var client = new lnrpc.Lightning('some.address:10009', grpc.credentials.createInsecure());
client.getInfo({}, meta);
```
However, this can get tiresome to do for each request, so to avoid explicitly including the macaroon we can update the credentials to include it automatically.
```js
var fs = require('fs');
var grpc = require('grpc');
process.env.GRPC_SSL_CIPHER_SUITES = 'HIGH+ECDSA'
// Lnd admin macaroon is at ~/.lnd/data/chain/bitcoin/simnet/admin.macaroon on Linux and
// ~/Library/Application Support/Lnd/data/chain/bitcoin/simnet/admin.macaroon on Mac
var m = fs.readFileSync('~/.lnd/data/chain/bitcoin/simnet/admin.macaroon');
var macaroon = m.toString('hex');
let m = fs.readFileSync('~/.lnd/data/chain/bitcoin/simnet/admin.macaroon');
let macaroon = m.toString('hex');
// build meta data credentials
var metadata = new grpc.Metadata()
let metadata = new grpc.Metadata()
metadata.add('macaroon', macaroon)
var macaroonCreds = grpc.credentials.createFromMetadataGenerator((_args, callback) => {
let macaroonCreds = grpc.credentials.createFromMetadataGenerator((_args, callback) => {
callback(null, metadata);
});
// build ssl credentials using the cert the same as before
var lndCert = fs.readFileSync("~/.lnd/tls.cert");
var sslCreds = grpc.credentials.createSsl(lndCert);
let lndCert = fs.readFileSync("~/.lnd/tls.cert");
let sslCreds = grpc.credentials.createSsl(lndCert);
// combine the cert credentials and the macaroon auth credentials
// such that every call is properly encrypted and authenticated
var credentials = grpc.credentials.combineChannelCredentials(sslCreds, macaroonCreds);
let credentials = grpc.credentials.combineChannelCredentials(sslCreds, macaroonCreds);
// Pass the crendentials when creating a channel
var lnrpcDescriptor = grpc.load("rpc.proto");
var lnrpc = lnrpcDescriptor.lnrpc;
var client = new lnrpc.Lightning('some.address:10009', credentials);
let lnrpcDescriptor = grpc.loadPackageDefinition(packageDefinition);
let lnrpc = lnrpcDescriptor.lnrpc;
let client = new lnrpc.Lightning('some.address:10009', credentials);
client.getInfo({}, (err, res) => { ... });
client.getInfo({}, (err, response) => {
if (err) {
console.log('Error: ' + err);
}
console.log('GetInfo:', response);
});
```
### Conclusion
## Conclusion
With the above, you should have all the `lnd` related `gRPC` dependencies
installed locally in your project. In order to get up to speed with `protofbuf`
@ -234,3 +238,9 @@ Javascript](https://developers.google.com/protocol-buffers/docs/reference/javasc
Additionally, [this official gRPC
resource](http://www.grpc.io/docs/tutorials/basic/node.html) provides more
details around how to drive `gRPC` from `node.js`.
## API documentation
There is an [online API documentation](https://api.lightning.community?javascript)
available that shows all currently existing RPC methods, including code snippets
on how to use them.

49
docs/grpc/python.md
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@ -3,37 +3,37 @@
This section enumerates what you need to do to write a client that communicates
with `lnd` in Python.
### Setup and Installation
## Setup and Installation
Lnd uses the gRPC protocol for communication with clients like lncli. gRPC is
based on protocol buffers and as such, you will need to compile the lnd proto
file in Python before you can use it to communicate with lnd.
* Create a virtual environment for your project
1. Create a virtual environment for your project
```
$ virtualenv lnd
```
* Activate the virtual environment
2. Activate the virtual environment
```
$ source lnd/bin/activate
```
* Install dependencies (googleapis-common-protos is required due to the use of
3. Install dependencies (googleapis-common-protos is required due to the use of
google/api/annotations.proto)
```
(lnd)$ pip install grpcio grpcio-tools googleapis-common-protos
```
* Clone the google api's repository (required due to the use of
4. Clone the google api's repository (required due to the use of
google/api/annotations.proto)
```
(lnd)$ git clone https://github.com/googleapis/googleapis.git
```
* Copy the lnd rpc.proto file (you'll find this at
5. Copy the lnd rpc.proto file (you'll find this at
[lnrpc/rpc.proto](https://github.com/lightningnetwork/lnd/blob/master/lnrpc/rpc.proto))
or just download it
```
(lnd)$ curl -o rpc.proto -s https://raw.githubusercontent.com/lightningnetwork/lnd/master/lnrpc/rpc.proto
```
* Compile the proto file
6. Compile the proto file
```
(lnd)$ python -m grpc_tools.protoc --proto_path=googleapis:. --python_out=. --grpc_python_out=. rpc.proto
```
@ -42,7 +42,22 @@ After following these steps, two files `rpc_pb2.py` and `rpc_pb2_grpc.py` will
be generated. These files will be imported in your project anytime you use
Python gRPC.
#### Imports and Client
### Generating RPC modules for subservers
If you want to use any of the subservers' functionality, you also need to
generate the python modules for them.
For example, if you want to generate the RPC modules for the `Router` subserver
(located/defined in `routerrpc/router.proto`), you need to run the following two
extra steps (after completing all 6 step described above) to get the
`router_pb2.py` and `router_pb2_grpc.py`:
```
(lnd)$ curl -o router.proto -s https://raw.githubusercontent.com/lightningnetwork/lnd/master/lnrpc/routerrpc/router.proto
(lnd)$ python -m grpc_tools.protoc --proto_path=googleapis:. --python_out=. --grpc_python_out=. router.proto
```
### Imports and Client
Every time you use Python gRPC, you will have to import the generated rpc modules
and set up a channel and stub to your connect to your `lnd` node:
@ -66,13 +81,13 @@ channel = grpc.secure_channel('localhost:10009', creds)
stub = lnrpc.LightningStub(channel)
```
### Examples
## Examples
Let's walk through some examples of Python gRPC clients. These examples assume
that you have at least two `lnd` nodes running, the RPC location of one of which
is at the default `localhost:10009`, with an open channel between the two nodes.
#### Simple RPC
### Simple RPC
```python
# Retrieve and display the wallet balance
@ -80,7 +95,7 @@ response = stub.WalletBalance(ln.WalletBalanceRequest())
print(response.total_balance)
```
#### Response-streaming RPC
### Response-streaming RPC
```python
request = ln.InvoiceSubscription()
@ -102,7 +117,7 @@ $ lncli sendpayment --pay_req=<PAY_REQ>
Your Python console should now display the details of the recently satisfied
invoice.
#### Bidirectional-streaming RPC
### Bidirectional-streaming RPC
```python
from time import sleep
@ -133,7 +148,7 @@ for payment in stub.SendPayment(request_iterable):
```
This example will send a payment of 100 satoshis every 2 seconds.
#### Using Macaroons
### Using Macaroons
To authenticate using macaroons you need to include the macaroon in the metadata of the request.
@ -180,7 +195,7 @@ stub.GetInfo(ln.GetInfoRequest())
```
### Conclusion
## Conclusion
With the above, you should have all the `lnd` related `gRPC` dependencies
installed locally into your virtual environment. In order to get up to speed
@ -189,3 +204,9 @@ Python](https://developers.google.com/protocol-buffers/docs/pythontutorial).
Additionally, [this official gRPC
resource](http://www.grpc.io/docs/tutorials/basic/python.html) provides more
details around how to drive `gRPC` from Python.
## API documentation
There is an [online API documentation](https://api.lightning.community?python)
available that shows all currently existing RPC methods, including code snippets
on how to use them.