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559a0502f1
Implement socket-api `recvmsg()` and `sendmsg()` for wasm app, add sample and update document.
86 lines
2.0 KiB
Markdown
86 lines
2.0 KiB
Markdown
# "socket-api" sample introduction
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This sample demonstrates how to use WAMR socket-api to develop wasm network applications.
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Two wasm applications are provided: tcp-server and tcp-client, and this sample demonstrates
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how they communicate with each other.
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## Preparation
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Please install WASI SDK, download the [wasi-sdk release](https://github.com/CraneStation/wasi-sdk/releases) and extract the archive to default path `/opt/wasi-sdk`.
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And install wabt, download the [wabt release](https://github.com/WebAssembly/wabt/releases) and extract the archive to default path `/opt/wabt`
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## Build the sample
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```bash
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mkdir build
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cd build
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cmake ..
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make
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```
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`iwasm` and three Wasm modules, `tcp_server.wasm`, `tcp_client.wasm`, `send_recv.wasm`
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will be generated. And their corresponding native version, `tcp_server`,
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`tcp_client`, `send_recv` are generated too.
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> Note that iwasm is built with libc-wasi and lib-pthread enabled.
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## Run workload
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Start the tcp server, which opens port 1234 and waits for clients to connect.
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```bash
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cd build
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./iwasm --addr-pool=0.0.0.0/15 tcp_server.wasm
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```
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Start the tcp client, which connects the server and receives message.
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```bash
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cd build
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./iwasm --addr-pool=127.0.0.1/15 tcp_client.wasm
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```
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The output of client is like:
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```bash
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[Client] Create socket
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[Client] Connect socket
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[Client] Client receive
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[Client] 115 bytes received:
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Buffer recieved:
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Say Hi from the Server
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Say Hi from the Server
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Say Hi from the Server
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Say Hi from the Server
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Say Hi from the Server
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[Client] BYE
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```
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`send_recv.wasm` contains a thread as a server and a thread as a client. They
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send and receive data via 127.0.0.1:1234.
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```bash
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$ ./iwasm --addr-pool=127.0.0.1/0 ./send_recv.wasm
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```
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The output is:
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```bash
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Server is online ...
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Client is running...
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Start receiving.
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Start sending.
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Send 106 bytes successfully!
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Receive 106 bytes successlly!
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Data:
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The stars shine down
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It brings us light
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Light comes down
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To make us paths
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It watches us
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And mourns for us
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```
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Refer to [socket api document](../../doc/socket_api.md) for more details.
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