[GitHub] [openwhisk-runtime-rust] ningyougang commented on pull request #39: Support array result include sequence action

[GitBox <gi...@apache.org>]

ningyougang commented on PR #39:
URL: https://github.com/apache/openwhisk-runtime-rust/pull/39#issuecomment-1194933642

   The rust supports sequence action by default, test steps as below
   * Write split.rs and sort.rs
   ```rust
   extern crate serde_json;
   
   use serde_derive::{Deserialize, Serialize};
   use serde_json::{Error, Value};
   
   #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
   struct Input {
       #[serde(default = "stranger")]
       name: String,
   }
   
   #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
   struct Output {
       greeting: String,
   }
   
   fn stranger() -> String {
       "stranger".to_string()
   }
   
   pub fn main(args: Value) -> Result<Value, Error> {
       // has no split, just return array, need to receive this value in next action(sort)
       let output = ["a", "b"];
       serde_json::to_value(output)
   }
   
   extern crate serde_json;
   
   use serde_derive::{Deserialize, Serialize};
   use serde_json::{Error, Value};
   
   #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
   struct Input {
       #[serde(default = "stranger")]
       name: String,
   }
   
   #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
   struct Output {
       greeting: String,
   }
   
   fn stranger() -> String {
       "stranger".to_string()
   }
   
   pub fn main(args: Value) -> Result<Value, Error> {
       println!("param args is {}", args);
   
       let inputParam = args.as_array();
       println!("input param as array is {:?}", inputParam);
   
       let defaultOutput = ["finally-a", "finally-b"];
       match inputParam {
          None => serde_json::to_value(defaultOutput),
          Some(x) => serde_json::to_value(x),
       }
   }
   ```
   * Create the action and invoke it
   ```shell
   wsk -i action create /whisk.system/utils/split-rust --kind rust:1.34 ~/split.rs
   wsk -i action create /whisk.system/utils/sort-rust --kind rust:1.34 ~/sort.rs
   wsk -i action create mySequence-rust --sequence /whisk.system/utils/split-rust,/whisk.system/utils/sort-rust
   wsk -i action invoke --result mySequence-rust -r -v
   ```
   
   refer to: https://docs.serde.rs/serde_json/value/enum.Value.html


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