From 40060daaf54479baad8fadfe69b4465720c3f729 Mon Sep 17 00:00:00 2001
From: Paul Z <info@pfz4.de>
Date: Mon, 1 May 2023 20:56:21 +0200
Subject: [PATCH] init

---
 .gitignore     |    2 +
 .gitlab-ci.yml |   42 ++
 Cargo.lock     | 1859 ++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml     |   14 +
 Dockerfile     |    5 +
 src/main.rs    |   60 ++
 6 files changed, 1982 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .gitlab-ci.yml
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 Dockerfile
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fedaa2b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+.env
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..bf97c54
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,42 @@
+variables:
+  DOCKER_TLS_CERTDIR: ""
+  DOCKER_HOST: tcp://docker:2375
+
+services:
+  - name: docker:dind
+    entrypoint: ["dockerd-entrypoint.sh", "--tls=false"]
+
+stages:
+  - build
+    #  - test
+  - pack
+
+cargo-build:
+  stage: build
+  image: rust:slim
+  variables:
+    CARGO_HOME: $CI_PROJECT_DIR/.cargo
+  before_script:
+  script:
+    - cargo build --release
+  cache:
+    key: $CI_COMMIT_REF_SLUG
+    paths:
+      - target/
+      - .cargo/registry/index/
+      - .cargo/registry/cache/
+  artifacts:
+    paths:
+      - target/release/bin
+
+docker:
+  stage: pack
+  image: docker:latest
+  only:
+    - master
+  script:
+    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
+    - docker build --network host -t $CI_REGISTRY_IMAGE/master . -f Dockerfile
+    - docker push $CI_REGISTRY_IMAGE/master
+  dependencies:
+    - cargo-build
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..60aeee9
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1859 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
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+ "windows_aarch64_gnullvm 0.48.0",
+ "windows_aarch64_msvc 0.48.0",
+ "windows_i686_gnu 0.48.0",
+ "windows_i686_msvc 0.48.0",
+ "windows_x86_64_gnu 0.48.0",
+ "windows_x86_64_gnullvm 0.48.0",
+ "windows_x86_64_msvc 0.48.0",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
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+[[package]]
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+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.0"
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+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
+[[package]]
+name = "zeroize"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..dc32bbb
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "stromsensor_mailer"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+dotenvy = "0.15.7"
+sqlx = { version = "0.6", features = ["runtime-tokio-rustls", "mysql", "chrono", "decimal"], default-features=false }
+lettre = { version="0.10.4", features=["smtp-transport", "pool", "rustls-tls", "hostname", "builder"], default-features=false }
+tokio = { version = "1.28.0", features = ["full"] }
+chrono = "0.4.24"
+rust_decimal = "1.29.1"
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..465aaa5
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,5 @@
+
+FROM debian:stable-slim as final
+WORKDIR /app
+COPY ./target/release/bin ./bin
+CMD ["/app/bin"]
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..be2ca2f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,60 @@
+use std::env;
+
+use chrono::{Local, NaiveDateTime};
+use lettre::{
+    message::header::ContentType, transport::smtp::authentication::Credentials, Message,
+    SmtpTransport, Transport,
+};
+use rust_decimal::{prelude::ToPrimitive, Decimal};
+use sqlx::{Connection, MySqlConnection, Row};
+
+#[tokio::main]
+async fn main() {
+    dotenvy::dotenv().ok();
+    let mut connection = MySqlConnection::connect(
+        &env::var("DATABASE_URL").expect("DATABASE_URL environment variable"),
+    )
+    .await
+    .unwrap();
+
+    let email_host = env::var("EMAIL_HOST").expect("EMAIL_HOST env var");
+    let email_user = env::var("EMAIL_USER").expect("EMAIL_USER env var");
+    let email_pass = env::var("EMAIL_PASS").expect("EMAIL_PASS env var");
+    let email_name = env::var("EMAIL_NAME").expect("EMAIL_NAME env var");
+    let email_to = env::var("EMAIL_TO").expect("EMAIL_TO env var");
+
+    let row =
+        sqlx::query("SELECT timestamp, value FROM counter_value ORDER BY timestamp DESC LIMIT 1")
+            .fetch_one(&mut connection)
+            .await
+            .unwrap();
+
+    let timestamp: NaiveDateTime = row.get("timestamp");
+    let value: Decimal = row.get("value");
+
+    let now = Local::now();
+
+    let mut email =
+        Message::builder().from(format!("{email_name} <{email_user}>").parse().unwrap());
+    for to in email_to.split(',') {
+        email = email.to(to.parse().unwrap());
+    }
+    let email = email
+        .subject(format!("Zählerstand vom {}", now.format("%d.%m.%Y")))
+        .header(ContentType::TEXT_PLAIN)
+        .body(format!(
+            "Zählerstand: {:.3} kWh\nStand: {} UTC",
+            (value.to_u128().unwrap() as f64) / 1000.0,
+            timestamp.format("%d.%m.%Y %H:%m"),
+        ))
+        .unwrap();
+
+    let creds = Credentials::new(email_user, email_pass);
+
+    SmtpTransport::relay(&email_host)
+        .unwrap()
+        .credentials(creds)
+        .build()
+        .send(&email)
+        .unwrap();
+}