fix: 🐛 check if PostGIS is installed when starting

check if PostGIS >= 2.4.0 is installed when starting martin

Issues: #13

Cargo.lock

@@ -741,6 +741,7 @@ dependencies = [
  "postgres 0.15.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "r2d2 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "r2d2_postgres 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -15,6 +15,7 @@ num_cpus = "1.8"
 postgres = { version = "0.15", features = ["with-time", "with-uuid", "with-serde_json"] }
 r2d2 = "0.8"
 r2d2_postgres = "0.14"
+semver = "0.9"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"

src/db.rs

@@ -1,6 +1,7 @@
 use r2d2::{Pool, PooledConnection};
 use r2d2_postgres::{PostgresConnectionManager, TlsMode};
 use std::error::Error;
+use std::io;
 
 pub type PostgresPool = Pool<PostgresConnectionManager>;
 pub type PostgresConnection = PooledConnection<PostgresConnectionManager>;
@@ -17,3 +18,15 @@ pub fn setup_connection_pool(
 
   Ok(pool)
 }
+
+pub fn select_postgis_verion(pool: &PostgresPool) -> io::Result<String> {
+  let conn = pool
+    .get()
+    .map_err(|err| io::Error::new(io::ErrorKind::Other, err.description()))?;
+
+  let version: String = conn
+    .query("select postgis_lib_version()", &[])
+    .map(|rows| rows.get(0).get("postgis_lib_version"))?;
+
+  Ok(version)
+}

src/main.rs

@@ -1,5 +1,4 @@
-#![warn(clippy)]
-
+#[cfg_attr(feature = "cargo-clippy", allow(clippy))]
 extern crate actix;
 extern crate actix_web;
 extern crate docopt;
@@ -13,6 +12,7 @@ extern crate num_cpus;
 extern crate postgres;
 extern crate r2d2;
 extern crate r2d2_postgres;
+extern crate semver;
 extern crate serde;
 #[macro_use]
 extern crate serde_derive;
@@ -32,13 +32,16 @@ mod table_source;
 mod utils;
 
 use docopt::Docopt;
+use semver::Version;
+use semver::VersionReq;
 use std::env;
 
 use cli::{Args, USAGE};
 use config::build_config;
-use db::setup_connection_pool;
+use db::{select_postgis_verion, setup_connection_pool};
 
 const VERSION: &str = env!("CARGO_PKG_VERSION");
+const REQUIRED_POSTGIS_VERSION: &str = ">= 2.4.0";
 
 fn main() {
   let env = env_logger::Env::default().filter_or(env_logger::DEFAULT_FILTER_ENV, "martin=info");
@@ -77,6 +80,25 @@ fn main() {
     }
   };
 
+  match select_postgis_verion(&pool) {
+    Ok(postgis_version) => {
+      info!("PostGIS version: {}", postgis_version);
+
+      let req = VersionReq::parse(REQUIRED_POSTGIS_VERSION).unwrap();
+      let version = Version::parse(postgis_version.as_str()).unwrap();
+
+      if !req.matches(&version) {
+        error!("Martin requires PostGIS {}", REQUIRED_POSTGIS_VERSION);
+        std::process::exit(-1);
+      }
+    }
+    Err(error) => {
+      error!("Can't get PostGIS version: {}", error);
+      error!("Martin requires PostGIS {}", REQUIRED_POSTGIS_VERSION);
+      std::process::exit(-1);
+    }
+  };
+
   let config = match build_config(&pool, args) {
     Ok(config) => config,
     Err(error) => {