Move Storage Backend code imag::storage::backend -> imag::storage
This commit is contained in:
parent
307e13da3d
commit
da2b482bda
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@ -19,7 +19,7 @@ use module::Module;
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use module::ModuleError;
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use module::CommandEnv;
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use module::bm::BMModule;
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use storage::backend::StorageBackend;
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use storage::StorageBackend;
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mod cli;
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mod configuration;
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@ -6,7 +6,7 @@ use regex::Regex;
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use module::{CommandEnv, CommandResult, Module, ModuleError};
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use module::bm::header::{build_header, get_tags_from_header};
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use runtime::Runtime;
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use storage::backend::StorageBackendError;
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use storage::StorageBackendError;
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use storage::file::File;
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use storage::json::parser::JsonHeaderParser;
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use storage::parser::Parser;
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@ -7,7 +7,7 @@ use std::result::Result;
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use clap::ArgMatches;
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use runtime::Runtime;
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use storage::backend::StorageBackend;
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use storage::StorageBackend;
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pub mod bm;
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pub mod helpers;
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@ -1,319 +0,0 @@
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use std::error::Error;
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use std::fmt::{Display, Formatter};
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use std::fmt::Result as FMTResult;
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use std::fs::File as FSFile;
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use std::fs::{create_dir_all, remove_file};
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use std::io::{Read, Write};
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use std::vec::{Vec, IntoIter};
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use glob::glob;
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use glob::Paths;
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use module::Module;
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use runtime::Runtime;
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use storage::file::File;
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use storage::file_id::*;
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use storage::parser::{FileHeaderParser, Parser};
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pub type BackendOperationResult<T = ()> = Result<T, StorageBackendError>;
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pub struct StorageBackend {
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basepath: String,
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storepath: String,
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}
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impl StorageBackend {
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pub fn new(rt: &Runtime) -> BackendOperationResult<StorageBackend> {
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use self::StorageBackendError as SBE;
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let storepath = rt.get_rtp() + "/store/";
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debug!("Trying to create {}", storepath);
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create_dir_all(&storepath).and_then(|_| {
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debug!("Creating succeeded, constructing backend instance");
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Ok(StorageBackend {
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basepath: rt.get_rtp(),
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storepath: storepath.clone(),
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})
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}).or_else(|e| {
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debug!("Creating failed, constructing error instance");
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Err(SBE::new("create_dir_all()", "Could not create store directories",
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Some(storepath), Some(Box::new(e))))
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})
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}
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pub fn iter_ids(&self, m: &Module) -> Result<IntoIter<FileID>, StorageBackendError>
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{
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use self::StorageBackendError as SBE;
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let globstr = self.prefix_of_files_for_module(m) + "*.imag";
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debug!("Globstring = {}", globstr);
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glob(&globstr[..])
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.and_then(|globlist| {
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debug!("Iterating over globlist");
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Ok(globlist_to_file_id_vec(globlist).into_iter())
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})
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.map_err(|e| {
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debug!("glob() returned error: {:?}", e);
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SBE::new("iter_ids()", "Cannot iter on file ids", None, None)
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})
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}
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pub fn iter_files<'a, HP>(&self, m: &'a Module, p: &Parser<HP>)
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-> Result<IntoIter<File<'a>>, StorageBackendError>
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where HP: FileHeaderParser
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{
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use self::StorageBackendError as SBE;
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self.iter_ids(m)
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.and_then(|ids| {
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debug!("Iterating ids and building files from them");
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debug!(" number of ids = {}", ids.len());
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Ok(self.filter_map_ids_to_files(m, p, ids).into_iter())
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})
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.map_err(|e| {
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debug!("StorageBackend::iter_ids() returned error = {:?}", e);
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SBE::new("iter_files()", "Cannot iter on files", None,
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Some(Box::new(e)))
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})
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}
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/*
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* Write a file to disk.
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*
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* The file is moved to this function as the file won't be edited afterwards
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*/
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pub fn put_file<HP>(&self, f: File, p: &Parser<HP>) -> BackendOperationResult
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where HP: FileHeaderParser
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{
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use self::StorageBackendError as SBE;
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let written = write_with_parser(&f, p);
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if written.is_err() { return Err(written.err().unwrap()); }
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let string = written.unwrap();
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let path = self.build_filepath(&f);
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debug!("Writing file: {}", path);
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debug!(" string: {}", string);
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FSFile::create(&path).map(|mut file| {
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debug!("Created file at '{}'", path);
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file.write_all(&string.clone().into_bytes())
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.map_err(|ioerr| {
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debug!("Could not write file");
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SBE::new("File::write_all()",
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"Could not write out File contents",
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None, Some(Box::new(ioerr)))
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})
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}).map_err(|writeerr| {
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debug!("Could not create file at '{}'", path);
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SBE::new("File::create()", "Creating file on disk failed", None,
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Some(Box::new(writeerr)))
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}).and(Ok(()))
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}
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/*
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* Update a file. We have the UUID and can find the file on FS with it and
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* then replace its contents with the contents of the passed file object
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*/
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pub fn update_file<HP>(&self, f: File, p: &Parser<HP>) -> BackendOperationResult
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where HP: FileHeaderParser
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{
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use self::StorageBackendError as SBE;
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let contents = write_with_parser(&f, p);
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if contents.is_err() { return Err(contents.err().unwrap()); }
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let string = contents.unwrap();
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let path = self.build_filepath(&f);
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debug!("Writing file: {}", path);
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debug!(" string: {}", string);
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FSFile::open(&path).map(|mut file| {
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debug!("Open file at '{}'", path);
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file.write_all(&string.clone().into_bytes())
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.map_err(|ioerr| {
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debug!("Could not write file");
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SBE::new("File::write()",
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"Tried to write contents of this file, though operation did not succeed",
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Some(string), Some(Box::new(ioerr)))
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})
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}).map_err(|writeerr| {
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debug!("Could not write file at '{}'", path);
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SBE::new("File::open()",
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"Tried to update contents of this file, though file doesn't exist",
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None, Some(Box::new(writeerr)))
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}).and(Ok(()))
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}
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/*
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* Find a file by its ID and return it if found. Return nothing if not
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* found, of course.
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*
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* TODO: Needs refactoring, as there might be an error when reading from
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* disk OR the id just does not exist.
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*/
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pub fn get_file_by_id<'a, HP>(&self, m: &'a Module, id: &FileID, p: &Parser<HP>) -> Option<File<'a>>
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where HP: FileHeaderParser
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{
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debug!("Searching for file with id '{}'", id);
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if id.get_type() == FileIDType::NONE {
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// We don't know the hash type, so we glob() around a bit.
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debug!("Having FileIDType::NONE, so we glob() for the raw ID");
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let id_str = id.get_id().unwrap_or(String::from("INVALID"));
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let globstr = self.prefix_of_files_for_module(m) + "*" + &id_str[..] + ".imag";
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debug!("Globbing with globstr = '{}'", globstr);
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glob(&globstr[..]).map(|globlist| {
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let idvec = globlist_to_file_id_vec(globlist).into_iter();
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let mut vec = self.filter_map_ids_to_files(m, p, idvec);
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vec.reverse();
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vec.pop()
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}).unwrap_or({
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debug!("No glob matches, actually. We can't do anything at this point");
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None
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})
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} else {
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// The (hash)type is already in the FileID object, so we can just
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// build a path from the information we already have
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debug!("We know FileIDType, so we build the path directly now");
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let filepath = self.build_filepath_with_id(m, id.clone());
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if let Ok(mut fs) = FSFile::open(filepath) {
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let mut s = String::new();
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fs.read_to_string(&mut s);
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debug!("Success opening file with id '{}'", id);
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debug!("Parsing to internal structure now");
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p.read(s).and_then(|(h, d)| {
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Ok(File::from_parser_result(m, id.clone(), h, d))
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}).ok()
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} else {
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debug!("No file with id '{}'", id);
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None
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}
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}
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}
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pub fn remove_file(&self, m: &Module, file: File, checked: bool) -> BackendOperationResult {
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use self::StorageBackendError as SBE;
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if checked {
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error!("Checked remove not implemented yet. I will crash now");
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unimplemented!()
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}
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debug!("Doing unchecked remove");
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info!("Going to remove file: {}", file);
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let fp = self.build_filepath(&file);
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remove_file(fp).map_err(|e| {
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SBE::new("remove_file()", "File removal failed",
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Some(format!("{}", file)), Some(Box::new(e)))
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})
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}
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fn build_filepath(&self, f: &File) -> String {
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self.build_filepath_with_id(f.owner(), f.id())
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}
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fn build_filepath_with_id(&self, owner: &Module, id: FileID) -> String {
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let idstr : String = id.clone().into();
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let idtype : FileIDType = id.into();
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let typestr : String = idtype.into();
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debug!("Building filepath with id");
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debug!(" basepath: '{}'", self.basepath);
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debug!(" storepath: '{}'", self.storepath);
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debug!(" id: '{}'", idstr);
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debug!(" type: '{}'", typestr);
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self.prefix_of_files_for_module(owner) +
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"-" + &typestr[..] +
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"-" + &idstr[..] +
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".imag"
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}
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fn prefix_of_files_for_module(&self, m: &Module) -> String {
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self.storepath.clone() + m.name()
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}
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fn filter_map_ids_to_files<'a, HP>(&self,
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m: &'a Module,
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p: &Parser<HP>,
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ids: IntoIter<FileID>)
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-> Vec<File<'a>>
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where HP: FileHeaderParser
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{
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ids.filter_map(|id| self.get_file_by_id(m, &id, p))
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.collect::<Vec<File>>()
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}
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}
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#[derive(Debug)]
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pub struct StorageBackendError {
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pub action: String, // The file system action in words
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pub desc: String, // A short description
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pub data_dump: Option<String>, // Data dump, if any
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pub caused_by: Option<Box<Error>>, // caused from this error
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}
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impl StorageBackendError {
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fn new<S>(action: S,
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desc: S,
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data: Option<String>,
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cause: Option<Box<Error>>)
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-> StorageBackendError
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where S: Into<String>
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{
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StorageBackendError {
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action: action.into(),
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desc: desc.into(),
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data_dump: data,
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caused_by: None,
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}
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}
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}
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impl Error for StorageBackendError {
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fn description(&self) -> &str {
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&self.desc[..]
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}
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fn cause(&self) -> Option<&Error> {
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self.caused_by.as_ref().map(|e| &**e)
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}
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}
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impl<'a> Display for StorageBackendError {
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fn fmt(&self, f: &mut Formatter) -> FMTResult {
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write!(f, "StorageBackendError[{}]: {}",
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self.action, self.desc)
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}
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}
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fn write_with_parser<'a, HP>(f: &File, p: &Parser<HP>) -> Result<String, StorageBackendError>
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where HP: FileHeaderParser
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{
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use self::StorageBackendError as SBE;
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p.write(f.contents())
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.or_else(|err| {
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Err(SBE::new("Parser::write()",
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"Cannot translate internal representation of file contents into on-disk representation",
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None, Some(Box::new(err))))
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})
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}
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fn globlist_to_file_id_vec(globlist: Paths) -> Vec<FileID> {
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globlist.filter_map(Result::ok)
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.map(|pbuf| FileID::from(&pbuf))
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.collect::<Vec<FileID>>()
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}
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@ -1,13 +1,326 @@
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pub use std::path::Path;
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pub use std::fs::File;
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pub use std::error::Error;
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pub use runtime::Runtime;
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use std::error::Error;
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use std::fmt::Result as FMTResult;
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use std::fmt::{Display, Formatter};
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use std::fs::File as FSFile;
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use std::fs::{create_dir_all, remove_file};
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use std::io::{Read, Write};
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use std::path::Path;
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use std::vec::{Vec, IntoIter};
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pub mod file;
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pub mod file_id;
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pub mod parser;
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pub mod backend;
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pub mod json;
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use glob::glob;
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use glob::Paths;
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use module::Module;
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use runtime::Runtime;
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use storage::file::File;
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use storage::file_id::*;
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use storage::parser::{FileHeaderParser, Parser};
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pub type BackendOperationResult<T = ()> = Result<T, StorageBackendError>;
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pub struct StorageBackend {
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basepath: String,
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storepath: String,
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}
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impl StorageBackend {
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pub fn new(rt: &Runtime) -> BackendOperationResult<StorageBackend> {
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use self::StorageBackendError as SBE;
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let storepath = rt.get_rtp() + "/store/";
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debug!("Trying to create {}", storepath);
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create_dir_all(&storepath).and_then(|_| {
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debug!("Creating succeeded, constructing backend instance");
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Ok(StorageBackend {
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basepath: rt.get_rtp(),
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storepath: storepath.clone(),
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})
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}).or_else(|e| {
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debug!("Creating failed, constructing error instance");
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Err(SBE::new("create_dir_all()", "Could not create store directories",
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Some(storepath), Some(Box::new(e))))
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})
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}
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pub fn iter_ids(&self, m: &Module) -> Result<IntoIter<FileID>, StorageBackendError>
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{
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use self::StorageBackendError as SBE;
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let globstr = self.prefix_of_files_for_module(m) + "*.imag";
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debug!("Globstring = {}", globstr);
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glob(&globstr[..])
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.and_then(|globlist| {
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debug!("Iterating over globlist");
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Ok(globlist_to_file_id_vec(globlist).into_iter())
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})
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.map_err(|e| {
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debug!("glob() returned error: {:?}", e);
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SBE::new("iter_ids()", "Cannot iter on file ids", None, None)
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})
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}
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pub fn iter_files<'a, HP>(&self, m: &'a Module, p: &Parser<HP>)
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-> Result<IntoIter<File<'a>>, StorageBackendError>
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where HP: FileHeaderParser
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{
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use self::StorageBackendError as SBE;
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self.iter_ids(m)
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.and_then(|ids| {
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debug!("Iterating ids and building files from them");
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debug!(" number of ids = {}", ids.len());
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Ok(self.filter_map_ids_to_files(m, p, ids).into_iter())
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})
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.map_err(|e| {
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debug!("StorageBackend::iter_ids() returned error = {:?}", e);
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SBE::new("iter_files()", "Cannot iter on files", None,
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Some(Box::new(e)))
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})
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}
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/*
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* Write a file to disk.
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*
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* The file is moved to this function as the file won't be edited afterwards
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*/
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pub fn put_file<HP>(&self, f: File, p: &Parser<HP>) -> BackendOperationResult
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where HP: FileHeaderParser
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{
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use self::StorageBackendError as SBE;
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let written = write_with_parser(&f, p);
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if written.is_err() { return Err(written.err().unwrap()); }
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let string = written.unwrap();
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let path = self.build_filepath(&f);
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debug!("Writing file: {}", path);
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debug!(" string: {}", string);
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FSFile::create(&path).map(|mut file| {
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debug!("Created file at '{}'", path);
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file.write_all(&string.clone().into_bytes())
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.map_err(|ioerr| {
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debug!("Could not write file");
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SBE::new("File::write_all()",
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"Could not write out File contents",
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None, Some(Box::new(ioerr)))
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})
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}).map_err(|writeerr| {
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debug!("Could not create file at '{}'", path);
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SBE::new("File::create()", "Creating file on disk failed", None,
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Some(Box::new(writeerr)))
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}).and(Ok(()))
|
||||
}
|
||||
|
||||
/*
|
||||
* Update a file. We have the UUID and can find the file on FS with it and
|
||||
* then replace its contents with the contents of the passed file object
|
||||
*/
|
||||
pub fn update_file<HP>(&self, f: File, p: &Parser<HP>) -> BackendOperationResult
|
||||
where HP: FileHeaderParser
|
||||
{
|
||||
use self::StorageBackendError as SBE;
|
||||
|
||||
let contents = write_with_parser(&f, p);
|
||||
if contents.is_err() { return Err(contents.err().unwrap()); }
|
||||
let string = contents.unwrap();
|
||||
|
||||
let path = self.build_filepath(&f);
|
||||
debug!("Writing file: {}", path);
|
||||
debug!(" string: {}", string);
|
||||
|
||||
FSFile::open(&path).map(|mut file| {
|
||||
debug!("Open file at '{}'", path);
|
||||
file.write_all(&string.clone().into_bytes())
|
||||
.map_err(|ioerr| {
|
||||
debug!("Could not write file");
|
||||
SBE::new("File::write()",
|
||||
"Tried to write contents of this file, though operation did not succeed",
|
||||
Some(string), Some(Box::new(ioerr)))
|
||||
})
|
||||
}).map_err(|writeerr| {
|
||||
debug!("Could not write file at '{}'", path);
|
||||
SBE::new("File::open()",
|
||||
"Tried to update contents of this file, though file doesn't exist",
|
||||
None, Some(Box::new(writeerr)))
|
||||
}).and(Ok(()))
|
||||
}
|
||||
|
||||
/*
|
||||
* Find a file by its ID and return it if found. Return nothing if not
|
||||
* found, of course.
|
||||
*
|
||||
* TODO: Needs refactoring, as there might be an error when reading from
|
||||
* disk OR the id just does not exist.
|
||||
*/
|
||||
pub fn get_file_by_id<'a, HP>(&self, m: &'a Module, id: &FileID, p: &Parser<HP>) -> Option<File<'a>>
|
||||
where HP: FileHeaderParser
|
||||
{
|
||||
debug!("Searching for file with id '{}'", id);
|
||||
|
||||
if id.get_type() == FileIDType::NONE {
|
||||
// We don't know the hash type, so we glob() around a bit.
|
||||
debug!("Having FileIDType::NONE, so we glob() for the raw ID");
|
||||
|
||||
let id_str = id.get_id().unwrap_or(String::from("INVALID"));
|
||||
let globstr = self.prefix_of_files_for_module(m) + "*" + &id_str[..] + ".imag";
|
||||
debug!("Globbing with globstr = '{}'", globstr);
|
||||
glob(&globstr[..]).map(|globlist| {
|
||||
let idvec = globlist_to_file_id_vec(globlist).into_iter();
|
||||
let mut vec = self.filter_map_ids_to_files(m, p, idvec);
|
||||
vec.reverse();
|
||||
vec.pop()
|
||||
}).unwrap_or({
|
||||
debug!("No glob matches, actually. We can't do anything at this point");
|
||||
None
|
||||
})
|
||||
} else {
|
||||
// The (hash)type is already in the FileID object, so we can just
|
||||
// build a path from the information we already have
|
||||
debug!("We know FileIDType, so we build the path directly now");
|
||||
let filepath = self.build_filepath_with_id(m, id.clone());
|
||||
if let Ok(mut fs) = FSFile::open(filepath) {
|
||||
let mut s = String::new();
|
||||
fs.read_to_string(&mut s);
|
||||
|
||||
debug!("Success opening file with id '{}'", id);
|
||||
debug!("Parsing to internal structure now");
|
||||
p.read(s).and_then(|(h, d)| {
|
||||
Ok(File::from_parser_result(m, id.clone(), h, d))
|
||||
}).ok()
|
||||
} else {
|
||||
debug!("No file with id '{}'", id);
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn remove_file(&self, m: &Module, file: File, checked: bool) -> BackendOperationResult {
|
||||
use self::StorageBackendError as SBE;
|
||||
|
||||
if checked {
|
||||
error!("Checked remove not implemented yet. I will crash now");
|
||||
unimplemented!()
|
||||
}
|
||||
|
||||
debug!("Doing unchecked remove");
|
||||
info!("Going to remove file: {}", file);
|
||||
|
||||
let fp = self.build_filepath(&file);
|
||||
remove_file(fp).map_err(|e| {
|
||||
SBE::new("remove_file()", "File removal failed",
|
||||
Some(format!("{}", file)), Some(Box::new(e)))
|
||||
})
|
||||
}
|
||||
|
||||
fn build_filepath(&self, f: &File) -> String {
|
||||
self.build_filepath_with_id(f.owner(), f.id())
|
||||
}
|
||||
|
||||
fn build_filepath_with_id(&self, owner: &Module, id: FileID) -> String {
|
||||
let idstr : String = id.clone().into();
|
||||
let idtype : FileIDType = id.into();
|
||||
let typestr : String = idtype.into();
|
||||
|
||||
debug!("Building filepath with id");
|
||||
debug!(" basepath: '{}'", self.basepath);
|
||||
debug!(" storepath: '{}'", self.storepath);
|
||||
debug!(" id: '{}'", idstr);
|
||||
debug!(" type: '{}'", typestr);
|
||||
|
||||
self.prefix_of_files_for_module(owner) +
|
||||
"-" + &typestr[..] +
|
||||
"-" + &idstr[..] +
|
||||
".imag"
|
||||
}
|
||||
|
||||
fn prefix_of_files_for_module(&self, m: &Module) -> String {
|
||||
self.storepath.clone() + m.name()
|
||||
}
|
||||
|
||||
fn filter_map_ids_to_files<'a, HP>(&self,
|
||||
m: &'a Module,
|
||||
p: &Parser<HP>,
|
||||
ids: IntoIter<FileID>)
|
||||
-> Vec<File<'a>>
|
||||
where HP: FileHeaderParser
|
||||
{
|
||||
ids.filter_map(|id| self.get_file_by_id(m, &id, p))
|
||||
.collect::<Vec<File>>()
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct StorageBackendError {
|
||||
pub action: String, // The file system action in words
|
||||
pub desc: String, // A short description
|
||||
pub data_dump: Option<String>, // Data dump, if any
|
||||
pub caused_by: Option<Box<Error>>, // caused from this error
|
||||
}
|
||||
|
||||
impl StorageBackendError {
|
||||
|
||||
fn new<S>(action: S,
|
||||
desc: S,
|
||||
data: Option<String>,
|
||||
cause: Option<Box<Error>>)
|
||||
-> StorageBackendError
|
||||
where S: Into<String>
|
||||
{
|
||||
StorageBackendError {
|
||||
action: action.into(),
|
||||
desc: desc.into(),
|
||||
data_dump: data,
|
||||
caused_by: None,
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
impl Error for StorageBackendError {
|
||||
|
||||
fn description(&self) -> &str {
|
||||
&self.desc[..]
|
||||
}
|
||||
|
||||
fn cause(&self) -> Option<&Error> {
|
||||
self.caused_by.as_ref().map(|e| &**e)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
impl<'a> Display for StorageBackendError {
|
||||
fn fmt(&self, f: &mut Formatter) -> FMTResult {
|
||||
write!(f, "StorageBackendError[{}]: {}",
|
||||
self.action, self.desc)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
fn write_with_parser<'a, HP>(f: &File, p: &Parser<HP>) -> Result<String, StorageBackendError>
|
||||
where HP: FileHeaderParser
|
||||
{
|
||||
use self::StorageBackendError as SBE;
|
||||
|
||||
p.write(f.contents())
|
||||
.or_else(|err| {
|
||||
Err(SBE::new("Parser::write()",
|
||||
"Cannot translate internal representation of file contents into on-disk representation",
|
||||
None, Some(Box::new(err))))
|
||||
})
|
||||
}
|
||||
|
||||
fn globlist_to_file_id_vec(globlist: Paths) -> Vec<FileID> {
|
||||
globlist.filter_map(Result::ok)
|
||||
.map(|pbuf| FileID::from(&pbuf))
|
||||
.collect::<Vec<FileID>>()
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue