git.r.bdr.sh - rbdr/blog/blob - src/metadata.rs

   1 use std::fs::File;
   2 use std::path::PathBuf;
   3 use std::io::Read;
   4 use std::time::{SystemTime, UNIX_EPOCH};
   5 use time::{OffsetDateTime, format_description::well_known::Rfc2822};
   6 use serde::{Serialize, Deserialize};
   7 use serde_json;
   8
   9 #[derive(Serialize, Deserialize)]
  10 pub struct Metadata {
  11     pub id: String,
  12     #[serde(alias = "createdOn")]
  13     pub created_on: u64
  14 }
  15
  16 impl Metadata {
  17     pub fn read_or_create(file_path: &PathBuf) -> Metadata {
  18         match Metadata::read_metadata_file(file_path) {
  19             Some(metadata) => metadata,
  20             None => {
  21                 let timestamp = SystemTime::now()
  22                     .duration_since(UNIX_EPOCH)
  23                     .map(|duration| duration.as_millis() as u64)
  24                     .unwrap_or_else(|_| 0);
  25                 return Metadata {
  26                     id: timestamp.to_string(),
  27                     created_on: timestamp
  28                 }
  29             }
  30         }
  31     }
  32
  33     pub fn created_on_utc(&self) -> Option<String> {
  34         let date = OffsetDateTime::from_unix_timestamp_nanos(
  35             (self.created_on * 1_000_000).into()
  36         ).ok()?;
  37         return date.format(&Rfc2822).ok();
  38     }
  39
  40
  41     fn read_metadata_file(file_path: &PathBuf) -> Option<Metadata> {
  42         let mut file = File::open(file_path).ok()?;
  43         let mut contents = String::new();
  44         file.read_to_string(&mut contents).ok()?;
  45         serde_json::from_str(&contents).ok()
  46     }
  47 }