[WSO2Con EU 2017] File Processing and Websockets with Ballerina
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The document describes file processing capabilities in Ballerina, highlighting features like file-based data transfers, secure file sharing, and various file operations (open, copy, delete, move). It also covers WebSockets integration for bi-directional messaging in modern applications, emphasizing long-lived connections and reduced overhead. Future improvements for secure file transfer and remote system connections are mentioned, along with resources for further learning and contribution.
![function main (string[] args) {
file:File target = {path:"/tmp/result.txt"};
target.open(file:W);
boolean b = target.exists();
println("file exists: " + b);
file:File source = {path:"/tmp/result.txt"};
file:File destination = {path:"/tmp/copy.txt"};
file:copy(source, destination);
println("file copied: /tmp/result.txt to /tmp/copy.txt");
destination.delete();
println("file deleted: /tmp/copy.txt");
destination = {path:"/tmp/move.txt"};
file:move(source, destination);
}
Ballerina File API - Example
Open
Exists
Copy
Delete
Move](https://image.slidesharecdn.com/fjubaw9jtfagg47ad00u-signature-25a03a0dd11bea2cb4b5d302614dc9fa369274823e87b86d7bcc419612b27068-poli-171106131830/85/WSO2Con-EU-2017-File-Processing-and-Websockets-with-Ballerina-6-320.jpg)
[WSO2Con EU 2017] File Processing and Websockets with Ballerina
- 1. Senior Lead - Solutions Engineer, WSO2 File Processing and Websockets with Ballerina Chanaka Fernando
- 2. File Processing with Ballerina
- 3. • File-based data transfers are here to stay • Cloud and on premise • Extract, Transform, Load (ETL) requirements • Different file formats • Streaming large files • Securely transfer files File based data sharing
- 4. • File I/O as part of the Ballerina I/O • Fine grained file access (Bytes, Characters) • Coarse grained file access (Records) • Large file transfer through streaming • Connect with remote file systems (FTP, SFTP, SMB, etc..) File Processing with Ballerina
- 5. • Open • List • Create directory • Copy • Move • Create new file • Delete Ballerina File API - Operations
- 6. function main (string[] args) { file:File target = {path:"/tmp/result.txt"}; target.open(file:W); boolean b = target.exists(); println("file exists: " + b); file:File source = {path:"/tmp/result.txt"}; file:File destination = {path:"/tmp/copy.txt"}; file:copy(source, destination); println("file copied: /tmp/result.txt to /tmp/copy.txt"); destination.delete(); println("file deleted: /tmp/copy.txt"); destination = {path:"/tmp/move.txt"}; file:move(source, destination); } Ballerina File API - Example Open Exists Copy Delete Move
- 7. Ballerina I/O API I/O APIs Record I/O RecordsCharacters Bytes I/O Channels: Files, Sockets, Devices, …. BytesI/O CharactersI/O Console I/O DataI/O Different record formats
- 8. • Read byte by byte • Character by character • Record by record • Canonical byte representation • Console I/O, Data I/O (Future) Ballerina I/O API - Files
- 9. Read Characters From File
- 10. Read a Record From File
- 11. • Support connecting with remote file systems over FTP/SMB/SFTP (in-development) • Secure file transfer through encryption Future Improvements
- 13. • Modern applications (especially web) consumes large amount of data in real time • Request-Response pattern no longer sufficient • HTTP (1.1 and prior) lives with hacks (AJAX long polling, Streaming, etc.) Why Websockets?
- 14. • Long-lived connections • Bi-directional messaging (full-duplex) • Low usage of headers (save bandwidth) • Co-exists with HTTP With Websockets
- 15. • Support for different frame types (text, binary, ping, pong) • Sub protocol support • SSL support • Live alongside HTTP Websockets in Ballerina
- 16. • Expose ballerina service through websockets • Executes different logic based on message type (text, binary, ping, pong) • Can configure base path and port which is exposing Websockets Server connector
- 17. Websockets Server Connector Websockets service definition Client initiates a connection Client connected Text frame received Connection closed Service configuration
- 18. Websockets Client Connector • Creates a connection with a websocket service • Supports sub protocols • Text, Binary, Ping, Pong message types • Supports security
- 19. • Visit Ballerina website https://ballerinalang.org/ • Start with examples https://ballerinalang.org/docs/by-example/ • Contribute https://github.com/ballerinalang Download and getting started 19
- 20. wso2.com