Adding a dry-run mode on local-clean & a retry policy.

Minor fixes to handle invalid metric record.

src/cassandra.rs

@@ -14,9 +14,10 @@ use crate::timerange::TimeRange;
 
 use cassandra_cpp::Session as CassSession;
 use cassandra_cpp::Uuid as CassUuid;
-use cassandra_cpp::{Batch,BatchType,BindRustType,CassCollection,Cluster,Error,LogLevel,Map,Statement};
+use cassandra_cpp::{Batch,BatchType,BindRustType,CassCollection,Cluster,Error,LogLevel,Map,RetryPolicy,Statement};
 use cassandra_cpp::{set_level,stmt};
 
+use chrono::Duration;
 use uuid::Uuid;
 
 #[derive(Debug, Clone)]
@@ -36,7 +37,8 @@ pub fn connect(contact_points: &str) -> Result<CassSession, Error> {
     let mut cluster = Cluster::default();
     cluster.set_contact_points(contact_points).unwrap();
     cluster.set_load_balance_round_robin();
-
+    cluster.set_retry_policy(RetryPolicy::downgrading_consistency_new());
+    cluster.set_request_timeout(Duration::seconds(30));
     cluster.set_protocol_version(4)?;
 
     cluster.connect()

src/cmd/local_clean.rs

@@ -52,6 +52,9 @@ fn clean_metrics_in_directory(session: &Session, directory: &str) -> Result<(),
             }
 
             println!("Deleting metric {}", metric.name());
+            if session.is_dry_run() {
+                continue;
+            }
             delete_metric(session, metric.name())?;
         }
     }
@@ -97,6 +100,9 @@ fn clean_empty_directories_in_directory(session: &Session, directory: &str) -> R
             }
 
             println!("Deleting directory {}", name);
+            if session.is_dry_run() {
+                continue;
+            }
             delete_directory(session, &name)?;
         }
     }

src/main.rs

@@ -54,6 +54,9 @@ fn main() -> Result<(), Box<dyn error::Error>> {
                                 .long("contact-points")
                                 .env("CASSANDRA_CONTACT_POINTS")
                                 .takes_value(true))
+                           .arg(Arg::with_name("dry-run")
+                                .help("Do not write in database (local-clean only)")
+                                .long("dry-run"))
                            .subcommand(SubCommand::with_name("info")
                                        .about("Information about a metric")
                                        .arg(Arg::with_name("metric")
@@ -124,7 +127,9 @@ fn main() -> Result<(), Box<dyn error::Error>> {
                                              .long("clean-directories")))
                            .subcommand(SubCommand::with_name("local-clean")
                                         .about("Clean a directory of outdated metrics & empty sub-directories")
-                                        .arg(Arg::with_name("directory")))
+                                        .arg(Arg::with_name("directory")
+                                             .index(1)
+                                             .required(true)))
                            .get_matches();
 
     let mut contact_points_metadata = "localhost";
@@ -137,7 +142,10 @@ fn main() -> Result<(), Box<dyn error::Error>> {
         contact_points_data = matches.value_of("contact-points").unwrap();
     }
 
-    let session = Session::new(&contact_points_metadata, &contact_points_data)?;
+    let dry_run = matches.is_present("dry-run");
+
+    let mut session = Session::new(&contact_points_metadata, &contact_points_data)?;
+    session.set_dry_run(dry_run);
 
     match matches.subcommand_name() {
         Some("info") => {

src/metric.rs

@@ -10,6 +10,7 @@ use std::fmt;
 use std::convert::TryFrom;
 
 use cassandra_cpp::Row;
+use chrono::Utc;
 
 #[derive(Debug)]
 pub struct Metric {
@@ -95,14 +96,25 @@ impl From<Row> for Metric {
             Err(_) => {},
         };
 
-        let created_on = row.get_column_by_name("created_on".to_string()).unwrap();
+        let created_on = row.get_column_by_name("created_on".to_string());
-        let created_on_timestamp = match created_on.get_uuid() {
+        let created_on_timestamp = if let Ok(creation_time) = created_on {
+            match creation_time.get_uuid() {
                 Err(_) => 0,
                 Ok(v) => v.timestamp(),
+            }
+        } else {
+            Utc::now().timestamp() as u64
         };
 
-        let updated_on = row.get_column_by_name("updated_on".to_string()).unwrap();
+        let updated_on = row.get_column_by_name("updated_on".to_string());
-        let updated_on_timestamp = updated_on.get_uuid().unwrap().timestamp();
+        let updated_on_timestamp = if let Ok(updated_time) = updated_on {
+            match updated_time.get_uuid() {
+                Err(_) => 0,
+                Ok(v) => v.timestamp(),
+            }
+        } else {
+            Utc::now().timestamp() as u64
+        };
 
         let uuid = match row.get_column_by_name("id".to_string()).unwrap().get_uuid() {
             Ok(v) => v.to_string(),

src/session.rs

@@ -13,6 +13,7 @@ use crate::cassandra::*;
 pub struct Session {
     metadata: CassSession,
     points: CassSession,
+    dry_run: bool,
 }
 
 impl Session {
@@ -23,11 +24,16 @@ impl Session {
         let session = Self {
             metadata: metadata,
             points: points,
+            dry_run: false,
         };
 
         Ok(session)
     }
 
+    pub fn set_dry_run(&mut self, dry_run: bool) {
+        self.dry_run = dry_run
+    }
+
     pub fn metadata_session(&self) -> &CassSession {
         &self.metadata
     }
@@ -45,4 +51,8 @@ impl Session {
     pub fn write_consistency(&self) -> Consistency {
         Consistency::LOCAL_QUORUM
     }
+
+    pub fn is_dry_run(&self) -> bool {
+        self.dry_run
+    }
 }