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const std = @import("std");
const os = @import("os.zig");
const Content = @This();
const log = std.log.scoped(.Content);
pub const Digest = [64]u8;
io: std.Io,
arena: *std.heap.ArenaAllocator,
root: std.Io.Dir,
pub fn init(io: std.Io, allocator: std.mem.Allocator, root_dir: std.Io.Dir) !Content {
const arena = try allocator.create(std.heap.ArenaAllocator);
errdefer allocator.destroy(arena);
arena.* = std.heap.ArenaAllocator.init(allocator);
return .{
.io = io,
.arena = arena,
.root = root_dir,
};
}
pub fn deinit(self: *Content) void {
self.root.close(self.io);
const allocator = self.arena.child_allocator;
self.arena.deinit();
allocator.destroy(self.arena);
}
pub fn digest(self: *Content, dir: std.Io.Dir, sub_path: []const u8) !Digest {
// generate sha256 digest
// TODO: use zig-based hashing?
const command = blk: {
var buf: [std.os.linux.PATH_MAX + 10]u8 = undefined;
@memcpy(buf[0..10], "sha256sum ");
@memcpy(buf[10 .. 10 + sub_path.len], sub_path);
break :blk buf[0 .. 10 + sub_path.len];
};
var buf: [std.os.linux.PATH_MAX + 64]u8 = undefined;
var w = std.Io.Writer.fixed(&buf);
try os.captureStdout(self.io, command, .{ .cwd = .{ .dir = dir } }, &w);
// take only the digest
return buf[0..64].*;
}
pub fn get(self: *Content, dgst: Digest) !?Digest {
const found = blk: {
self.root.access(self.io, &dgst, .{}) catch |err| switch (err) {
error.FileNotFound => break :blk false,
else => return err,
};
break :blk true;
};
if (found) {
return dgst;
} else {
return null;
}
}
pub fn add(self: *Content, dir: std.Io.Dir, sub_path: []const u8) !Digest {
const dgst = try self.digest(dir, sub_path);
return (try self.get(dgst)) orelse {
// create digest directory
try self.root.createDirPath(self.io, &dgst);
log.debug("Added {s}", .{dgst});
return dgst;
};
}
pub fn del(self: *Content, dgst: Digest) !void {
try self.root.deleteTree(self.io, &dgst);
}
const Enumerator = struct {
content: *Content,
walker: std.Io.Dir.SelectiveWalker,
pub fn deinit(self: *Enumerator) void {
self.walker.deinit();
}
pub fn next(self: *Enumerator) !?Digest {
if (try self.walker.next(self.content.io)) |e| {
switch (e.kind) {
// TODO: we should probably check that this is actually a digest
.directory => return e.basename[0..64].*,
else => return null,
}
} else {
return null;
}
}
};
pub fn enumerate(self: *Content, allocator: std.mem.Allocator) !Enumerator {
return .{
.walker = try self.root.walkSelectively(allocator),
.content = self,
};
}
pub fn propSet(self: *Content, dgst: Digest, key: []const u8, val: ?[]const u8) !void {
const digest_dir = try self.root.openDir(self.io, &dgst, .{});
defer digest_dir.close(self.io);
if (val == null) {
return try digest_dir.deleteFile(self.io, key);
}
return try digest_dir.writeFile(self.io, .{
.sub_path = key,
.data = val.?,
});
}
pub fn propGet(self: *Content, dgst: Digest, key: []const u8, allocator: std.mem.Allocator) !?[]const u8 {
const digest_dir = try self.root.openDir(self.io, &dgst, .{});
defer digest_dir.close(self.io);
if (digest_dir.readFileAlloc(self.io, key, allocator, .unlimited)) |val| {
return val;
} else |err| switch (err) {
error.FileNotFound => return null,
else => return err,
}
}
// fn checkLink(self: *Content, allocator: std.mem.Allocator, dgst: Digest) ![]const u8 {
// const link_target = try self.propGet(dgst, "link", allocator);
// // check target exists
// try std.Io.Dir.cwd().access(self.io, link_target, .{ .read = true });
// return link_target;
// }
test "e2e" {
std.testing.log_level = .debug;
const DEMO_DIR: []const u8 = "/home/robert/tmp/rbc-demo/";
const CONTENT_DIR: []const u8 = DEMO_DIR ++ ".content";
try std.Io.Dir.cwd().deleteTree(std.testing.io, CONTENT_DIR);
const demo_dir = try std.Io.Dir.cwd().openDir(std.testing.io, DEMO_DIR, .{ .iterate = true });
const content_dir = try std.Io.Dir.cwd().createDirPathOpen(std.testing.io, CONTENT_DIR, .{ .open_options = .{ .iterate = true } });
var cnt = try Content.init(std.testing.io, std.testing.allocator, content_dir);
defer cnt.deinit();
{
var walker = try demo_dir.walkSelectively(std.testing.allocator);
defer walker.deinit();
while (try walker.next(std.testing.io)) |e| {
switch (e.kind) {
.file => {
log.info("+ {s}", .{e.path});
const dgst = try cnt.add(demo_dir, e.path);
try content_dir.access(std.testing.io, &dgst, .{});
const rel = try std.fs.path.relativePosix(std.testing.allocator, DEMO_DIR, CONTENT_DIR, e.path);
defer std.testing.allocator.free(rel);
try cnt.propSet(dgst, "link", rel);
},
else => {},
}
}
}
var etor = try cnt.enumerate(std.testing.allocator);
defer etor.deinit();
{
const dgst = try etor.next();
try std.testing.expect(dgst != null);
try cnt.propSet(dgst.?, "foo", "bar");
const val1 = try cnt.propGet(dgst.?, "foo", std.testing.allocator);
try std.testing.expect(val1 != null);
defer std.testing.allocator.free(val1);
try std.testing.expect(std.mem.eql(u8, "bar", val1.?));
try cnt.propSet(dgst.?, "foo", null);
const val2 = try cnt.propGet(dgst.?, "foo", std.testing.allocator);
try std.testing.expect(val2 == null);
}
{
const dgst = try etor.next();
try std.testing.expect(dgst != null);
try cnt.del(dgst.?);
const err = content_dir.access(std.testing.io, &dgst.?, .{});
try std.testing.expectError(error.FileNotFound, err);
}
while (try etor.next()) |dgst| {
log.info("? {s}", .{dgst});
try content_dir.access(std.testing.io, &dgst, .{});
const link = try cnt.propGet(dgst, "link", std.testing.allocator);
try std.testing.expect(link != null);
defer std.testing.allocator.free(link.?);
try content_dir.access(std.testing.io, link.?, .{});
log.info("l {s}", .{link.?});
}
}
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