implement rudimentary message storing systemstore

1 files changed, 59 insertions, 0 deletions

diff --git a/store.lua b/store.lua
new file mode 100644
index 0000000..a970fcb
--- /dev/null
+++ b/store.lua
@@ -0,0 +1,59 @@
+local cqueues = require'cqueues'
+local db = require'r.db'
+local qw = require'r.qw'
+local html = require'r.html'
+local T = html.T
+local class = require'r.class'
+local App = require'r.web.app'
+local server = require'r.web.server'
+
+local Queue = require'queue'
+local Log = require'log'
+
+local Store = class() -- we only have 1 instance of this, but, ough,
+function Store.make(cls) return setmetatable({
+	q = Queue(),
+	log = Log"store",
+},cls) end
+
+function Store.storing(self)
+	local conn = db.conn()
+	for msg in self.q:iter() do
+		-- needs to go in its own coro
+		-- so we don't gum up the works while waiting on the db
+		conn:exec("insert into messages (ts, body) values (?,?);",
+			os.time(), msg.body)
+		self.log("stored",msg.body)
+		assert(conn:commit()) end end
+function Store.store(self, msg) self.q:enqueue(msg) end
+
+local function view(req)
+	local conn <close> = db.conn()
+	local rows = conn:fetch"select * from messages order by ts asc;"
+	local fields = qw"id ts body"
+	-- list comprehensions? WHAT ARE THOSE?????
+	local ths={} for i,v in ipairs(fields) do ths[i]=T.th(v) end
+	local trs={} for ri,r in ipairs(rows) do
+		local tds = {} for i,v in ipairs(fields) do tds[i]=T.td(r[v]) end
+		trs[ri] = T.tr(tds) end
+	local tab = T.table{
+		T.thead(T.tr(ths)),
+		T.tbody(trs),
+	}
+	return html.html {
+		T.h1'the messages',
+		tab
+	} end
+local app = App{ view = view }
+function Store.serving(self)
+	return server.run(self.cq, app) end
+
+function Store.run(self)
+	self.cq = cqueues.new()
+	self.cq:wrap(self.storing, self)
+	self.cq:wrap(self.serving, self)
+	self.log("now running")
+	self.log:loop(self.cq)
+end
+
+return Store