83 lines
4.3 KiB
Markdown
83 lines
4.3 KiB
Markdown
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# Pure JavaScript gRPC Client
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## Installation
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Node 12 is recommended. The exact set of compatible Node versions can be found in the `engines` field of the `package.json` file.
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```sh
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npm install @grpc/grpc-js
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```
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## Documentation
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Documentation specifically for the `@grpc/grpc-js` package is currently not available. However, [documentation is available for the `grpc` package](https://grpc.github.io/grpc/node/grpc.html), and the two packages contain mostly the same interface. There are a few notable differences, however, and these differences are noted in the "Migrating from grpc" section below.
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## Features
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- Clients
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- Automatic reconnection
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- Servers
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- Streaming
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- Metadata
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- Partial compression support: clients can compress and decompress messages, and servers can decompress request messages
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- Pick first and round robin load balancing policies
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- Client Interceptors
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- Connection Keepalives
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- HTTP Connect support (proxies)
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If you need a feature from the `grpc` package that is not provided by the `@grpc/grpc-js`, please file a feature request with that information.
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This library does not directly handle `.proto` files. To use `.proto` files with this library we recommend using the `@grpc/proto-loader` package.
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## Migrating from [`grpc`](https://www.npmjs.com/package/grpc)
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`@grpc/grpc-js` is almost a drop-in replacement for `grpc`, but you may need to make a few code changes to use it:
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- If you are currently loading `.proto` files using `grpc.load`, that function is not available in this library. You should instead load your `.proto` files using `@grpc/proto-loader` and load the resulting package definition objects into `@grpc/grpc-js` using `grpc.loadPackageDefinition`.
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- If you are currently loading packages generated by `grpc-tools`, you should instead generate your files using the `generate_package_definition` option in `grpc-tools`, then load the object exported by the generated file into `@grpc/grpc-js` using `grpc.loadPackageDefinition`.
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- If you have a server and you are using `Server#bind` to bind ports, you will need to use `Server#bindAsync` instead.
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- If you are using any channel options supported in `grpc` but not supported in `@grpc/grpc-js`, you may need to adjust your code to handle the different behavior. Refer to [the list of supported options](#supported-channel-options) below.
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- Refer to the [detailed package comparison](https://github.com/grpc/grpc-node/blob/master/PACKAGE-COMPARISON.md) for more details on the differences between `grpc` and `@grpc/grpc-js`.
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## Supported Channel Options
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Many channel arguments supported in `grpc` are not supported in `@grpc/grpc-js`. The channel arguments supported by `@grpc/grpc-js` are:
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- `grpc.ssl_target_name_override`
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- `grpc.primary_user_agent`
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- `grpc.secondary_user_agent`
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- `grpc.default_authority`
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- `grpc.keepalive_time_ms`
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- `grpc.keepalive_timeout_ms`
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- `grpc.keepalive_permit_without_calls`
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- `grpc.service_config`
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- `grpc.max_concurrent_streams`
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- `grpc.initial_reconnect_backoff_ms`
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- `grpc.max_reconnect_backoff_ms`
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- `grpc.use_local_subchannel_pool`
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- `grpc.max_send_message_length`
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- `grpc.max_receive_message_length`
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- `grpc.enable_http_proxy`
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- `grpc.default_compression_algorithm`
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- `grpc.enable_channelz`
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- `grpc.dns_min_time_between_resolutions_ms`
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- `grpc.enable_retries`
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- `grpc.max_connection_age_ms`
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- `grpc.max_connection_age_grace_ms`
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- `grpc.max_connection_idle_ms`
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- `grpc.per_rpc_retry_buffer_size`
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- `grpc.retry_buffer_size`
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- `grpc.service_config_disable_resolution`
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- `grpc.client_idle_timeout_ms`
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- `grpc-node.max_session_memory`
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- `grpc-node.tls_enable_trace`
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- `channelOverride`
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- `channelFactoryOverride`
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## Some Notes on API Guarantees
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The public API of this library follows semantic versioning, with some caveats:
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- Some methods are prefixed with an underscore. These methods are internal and should not be considered part of the public API.
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- The class `Call` is only exposed due to limitations of TypeScript. It should not be considered part of the public API.
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- In general, any API that is exposed by this library but is not exposed by the `grpc` library is likely an error and should not be considered part of the public API.
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- The `grpc.experimental` namespace contains APIs that have not stabilized. Any API in that namespace may break in any minor version update.
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