Refactored QLDB code examples

aws/sdk/examples/qldb/Cargo.toml

@@ -10,16 +10,8 @@ edition = "2018"
 qldb = { package = "aws-sdk-qldb", path = "../../build/aws-sdk/qldb" }
 qldbsession = { package = "aws-sdk-qldbsession", path = "../../build/aws-sdk/qldbsession" }
 aws-types = { path = "../../build/aws-sdk/aws-types" }
-
 tokio = { version = "1", features = ["full"] }
-
-# For command-line arguments
 structopt = { version = "0.3", default-features = false }
-
 tracing-subscriber = { version = "0.2.16", features = ["fmt"] }
 
-# used only for static endpoint configuration:
-http = "0.2.3"
 
-# used only to enable basic logging:
-env_logger = "0.8.2"

aws/sdk/examples/qldb/src/bin/create-ledger.rs

@@ -4,25 +4,21 @@
  */
 
 use aws_types::region::ProvideRegion;
-
 use qldb::model::PermissionsMode;
-use qldb::{Client, Config, Error, Region};
-
+use qldb::{Client, Config, Error, Region, PKG_VERSION};
 use structopt::StructOpt;
-use tracing_subscriber::fmt::format::FmtSpan;
-use tracing_subscriber::fmt::SubscriberBuilder;
 
 #[derive(Debug, StructOpt)]
 struct Opt {
-    /// The region. Overrides environment variable AWS_DEFAULT_REGION.
+    /// The default AWS Region.
     #[structopt(short, long)]
     default_region: Option<String>,
 
     /// The name of the ledger.
     #[structopt(short, long)]
     ledger: String,
 
-    /// Whether to display additional runtime information
+    /// Whether to display additional runtime information.
     #[structopt(short, long)]
     verbose: bool,
 }
@@ -31,12 +27,14 @@ struct Opt {
 /// # Arguments
 ///
 /// * `-l LEDGER` - The name of the ledger.
-/// * `[-d DEFAULT-REGION]` - The region in which the client is created.
-///    If not supplied, uses the value of the **AWS_DEFAULT_REGION** environment variable.
+/// * `[-d DEFAULT-REGION]` - The Region in which the client is created.
+///    If not supplied, uses the value of the **AWS_REGION** environment variable.
 ///    If the environment variable is not set, defaults to **us-west-2**.
 /// * `[-v]` - Whether to display additional information.
 #[tokio::main]
 async fn main() -> Result<(), Error> {
+    tracing_subscriber::fmt::init();
+
     let Opt {
         default_region,
         ledger,
@@ -50,13 +48,9 @@ async fn main() -> Result<(), Error> {
         .unwrap_or_else(|| Region::new("us-west-2"));
 
     if verbose {
-        println!("QLDB client version: {}\n", qldb::PKG_VERSION);
-        println!("Region:              {:?}", &region);
-
-        SubscriberBuilder::default()
-            .with_env_filter("info")
-            .with_span_events(FmtSpan::CLOSE)
-            .init();
+        println!("QLDB version: {}", PKG_VERSION);
+        println!("Region:       {:?}", &region);
+        println!();
     }
 
     let conf = Config::builder().region(region).build();

aws/sdk/examples/qldb/src/bin/list-ledgers.rs

@@ -4,34 +4,31 @@
  */
 
 use aws_types::region::ProvideRegion;
-
-//use qldbsession::model::StartSessionRequest;
-use qldb::{Client, Config, Error, Region};
-
+use qldb::{Client, Config, Error, Region, PKG_VERSION};
 use structopt::StructOpt;
-use tracing_subscriber::fmt::format::FmtSpan;
-use tracing_subscriber::fmt::SubscriberBuilder;
 
 #[derive(Debug, StructOpt)]
 struct Opt {
-    /// The region. Overrides environment variable AWS_DEFAULT_REGION.
+    /// The default AWS Region.
     #[structopt(short, long)]
     default_region: Option<String>,
 
-    /// Whether to display additional runtime information
+    /// Whether to display additional information.
     #[structopt(short, long)]
     verbose: bool,
 }
 
 /// Lists your Amazon QLDB ledgers.
 /// # Arguments
 ///
-/// * `[-d DEFAULT-REGION]` - The region in which the client is created.
-///    If not supplied, uses the value of the **AWS_DEFAULT_REGION** environment variable.
+/// * `[-d DEFAULT-REGION]` - The Region in which the client is created.
+///    If not supplied, uses the value of the **AWS_REGION** environment variable.
 ///    If the environment variable is not set, defaults to **us-west-2**.
 /// * `[-v]` - Whether to display additional information.
 #[tokio::main]
 async fn main() -> Result<(), Error> {
+    tracing_subscriber::fmt::init();
+
     let Opt {
         default_region,
         verbose,
@@ -44,13 +41,9 @@ async fn main() -> Result<(), Error> {
         .unwrap_or_else(|| Region::new("us-west-2"));
 
     if verbose {
-        println!("OLDB client version: {}\n", qldb::PKG_VERSION);
-        println!("Region:              {:?}", &region);
-
-        SubscriberBuilder::default()
-            .with_env_filter("info")
-            .with_span_events(FmtSpan::CLOSE)
-            .init();
+        println!("OLDB version: {}", PKG_VERSION);
+        println!("Region:       {:?}", &region);
+        println!();
     }
 
     let conf = Config::builder().region(region).build();

aws/sdk/examples/qldb/src/bin/qldb-helloworld.rs

@@ -4,39 +4,38 @@
  */
 
 use aws_types::region::ProvideRegion;
-
 use qldbsession::model::StartSessionRequest;
-use qldbsession::{Client, Config, Error, Region};
+use qldbsession::{Client, Config, Error, Region, PKG_VERSION};
 
 use structopt::StructOpt;
-use tracing_subscriber::fmt::format::FmtSpan;
-use tracing_subscriber::fmt::SubscriberBuilder;
 
 #[derive(Debug, StructOpt)]
 struct Opt {
-    /// The region. Overrides environment variable AWS_DEFAULT_REGION.
+    /// The default AWS Region.
     #[structopt(short, long)]
     default_region: Option<String>,
 
-    /// Specifies the ledger
+    /// The name of the ledger.
     #[structopt(short, long)]
     ledger: String,
 
-    /// Whether to display additional runtime information
+    /// Whether to display additional information.
     #[structopt(short, long)]
     verbose: bool,
 }
 
-/// Creates a low-level Amazon QLDB session against a ledger.
+/// Creates a low-level Amazon QLDB session.
 /// # Arguments
 ///
 /// * `-l LEDGER` - The name of the ledger to start a new session against.
-/// * `[-d DEFAULT-REGION]` - The region in which the client is created.
-///    If not supplied, uses the value of the **AWS_DEFAULT_REGION** environment variable.
+/// * `[-d DEFAULT-REGION]` - The Region in which the client is created.
+///    If not supplied, uses the value of the **AWS_REGION** environment variable.
 ///    If the environment variable is not set, defaults to **us-west-2**.
 /// * `[-v]` - Whether to display additional information.
 #[tokio::main]
 async fn main() -> Result<(), Error> {
+    tracing_subscriber::fmt::init();
+
     let Opt {
         ledger,
         default_region,
@@ -50,30 +49,25 @@ async fn main() -> Result<(), Error> {
         .unwrap_or_else(|| Region::new("us-west-2"));
 
     if verbose {
-        println!("OLDB client version: {}\n", qldb::PKG_VERSION);
-        println!("Region:              {:?}", &region);
-        println!("Ledger:              {}", ledger);
-
-        SubscriberBuilder::default()
-            .with_env_filter("info")
-            .with_span_events(FmtSpan::CLOSE)
-            .init();
+        println!("OLDB version: {}", PKG_VERSION);
+        println!("Region:       {:?}", &region);
+        println!("Ledger:       {}", ledger);
+        println!();
     }
 
     let conf = Config::builder().region(region).build();
     let client = Client::from_conf(conf);
+
     let result = client
         .send_command()
         .start_session(StartSessionRequest::builder().ledger_name(ledger).build())
         .send()
         .await?;
 
-    match result.start_session {
-        Some(s) => {
-            println!("Your session id: {:?}", s.session_token);
-        }
-        None => unreachable!("a start session will result in an Err or a start session result"),
-    }
+    println!(
+        "Session id: {:?}",
+        result.start_session.unwrap().session_token
+    );
 
     Ok(())
 }