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-- This is a module that does the heavy lifting to provide an HTTP/2 enabled
-- server that supports TLS by default and provides endpoint for other modules
-- in order to enable them to export restful APIs and websocket streams.
-- One example is statistics module that can stream live metrics on the website,
-- or publish metrics on request for Prometheus scraper.
local http_server = require('http.server')
local http_headers = require('http.headers')
local http_websocket = require('http.websocket')
local http_util = require "http.util"
local x509, pkey = require('openssl.x509'), require('openssl.pkey')
-- Module declaration
local M = {}
-- Export HTTP service endpoints
M.endpoints = {
['/'] = {'text/html', 'test'},
}
-- Serve known requests, for methods other than GET
-- the endpoint must be a closure and not a preloaded string
local function serve(endpoints, h, stream)
local hsend = http_headers.new()
local path = h:get(':path')
local entry = endpoints[path]
if not entry then -- Accept top-level path match
entry = endpoints[path:match '^/[^/?]*']
end
-- Unpack MIME and data
local data, mime, ttl, err
if entry then
mime = entry[1]
data = entry[2]
ttl = entry[4]
end
-- Get string data out of service endpoint
if type(data) == 'function' then
local set_mime, set_ttl
data, err, set_mime, set_ttl = data(h, stream)
-- Override default endpoint mime/TTL
if set_mime then mime = set_mime end
if set_ttl then ttl = set_ttl end
-- Handler doesn't provide any data
if data == false then return end
if type(data) == 'number' then return tostring(data), err end
-- Methods other than GET require handler to be closure
elseif h:get(':method') ~= 'GET' then
return '501', ''
end
if not mime or type(data) ~= 'string' then
return '404', ''
else
-- Serve content type appropriately
hsend:append(':status', '200')
hsend:append('content-type', mime)
hsend:append('content-length', tostring(#data))
if ttl then
hsend:append('cache-control', string.format('max-age=%d', ttl))
end
assert(stream:write_headers(hsend, false))
assert(stream:write_chunk(data, true))
end
end
-- Web server service closure
local function route(endpoints)
return function (_, stream)
-- HTTP/2: We're only permitted to send in open/half-closed (remote)
local connection = stream.connection
if connection.version >= 2 then
if stream.state ~= 'open' and stream.state ~= 'half closed (remote)' then
return
end
end
-- Start reading headers
local h = assert(stream:get_headers())
local m = h:get(':method')
local path = h:get(':path')
-- Upgrade connection to WebSocket
local ws = http_websocket.new_from_stream(stream, h)
if ws then
assert(ws:accept { protocols = {'json'} })
-- Continue streaming results to client
local ep = endpoints[path]
local cb = ep[3]
if cb then
cb(h, ws)
end
ws:close()
return
else
local ok, err, reason = http_util.yieldable_pcall(serve, endpoints, h, stream)
if not ok or err then
print(string.format('%s err %s %s: %s (%s)', os.date(), m, path, err or '500', reason))
-- Method is not supported
local hsend = http_headers.new()
hsend:append(':status', err or '500')
if reason then
assert(stream:write_headers(hsend, false))
assert(stream:write_chunk(reason, true))
else
assert(stream:write_headers(hsend, true))
end
else
print(string.format('%s ok %s %s', os.date(), m, path))
end
end
end
end
-- @function Prefer HTTP/2 or HTTP/1.1
local function alpnselect(_, protos)
for _, proto in ipairs(protos) do
if proto == 'h2' or proto == 'http/1.1' then
return proto
end
end
return nil
end
-- @function Create TLS context
local function tlscontext(crt, key)
local http_tls = require('http.tls')
local ctx = http_tls.new_server_context()
if ctx.setAlpnSelect then
ctx:setAlpnSelect(alpnselect)
end
assert(ctx:setPrivateKey(key))
assert(ctx:setCertificate(crt))
return ctx
end
-- @function Listen on given HTTP(s) host
function M.add_interface(conf)
local crt, key
if conf.tls ~= false then
assert(conf.cert, 'cert missing')
assert(conf.key, 'private key missing')
-- Check if a cert file was specified
-- Read x509 certificate
local f = io.open(conf.cert, 'r')
if f then
crt = assert(x509.new(f:read('*all')))
f:close()
-- Continue reading key file
if crt then
f = io.open(conf.key, 'r')
key = assert(pkey.new(f:read('*all')))
f:close()
end
end
-- Check loaded certificate
assert(crt and key,
string.format('failed to load certificate "%s"', conf.cert))
end
-- Compose server handler
local routes = route(conf.endpoints or M.endpoints)
-- Check if UNIX socket path is used
local addr_str
if not conf.path then
conf.host = conf.host or 'localhost'
conf.port = conf.port or 8053
addr_str = string.format('%s@%d', conf.host, conf.port)
else
if conf.host or conf.port then
error('either "path", or "host" and "port" must be provided')
end
addr_str = conf.path
end
-- Create TLS context and start listening
local s, err = http_server.listen {
-- cq = worker.bg_worker.cq,
host = conf.host,
port = conf.port,
path = conf.path,
v6only = conf.v6only,
unlink = conf.unlink,
reuseaddr = conf.reuseaddr,
reuseport = conf.reuseport,
client_timeout = conf.client_timeout or 5,
ctx = crt and tlscontext(crt, key),
tls = conf.tls,
onstream = routes,
-- Log errors, but do not throw
onerror = function(myserver, context, op, err, errno) -- luacheck: ignore 212
local msg = '[http] ' .. op .. ' on ' .. tostring(context) .. ' failed'
if err then
msg = msg .. ': ' .. tostring(err)
end
print(msg)
end,
}
-- Manually call :listen() so that we are bound before calling :localname()
if s then
err = select(2, s:listen())
end
assert(not err, string.format('failed to listen on %s: %s', addr_str, err))
return s
end
-- init
local files = {
'ok0_badtimes.xml',
'ok1.xml',
'ok1_expired1.xml',
'ok1_notyet1.xml',
'ok2.xml',
'err_attr_validfrom_missing.xml',
'err_attr_validfrom_invalid.xml',
'err_attr_extra_attr.xml',
'err_elem_missing.xml',
'err_elem_extra.xml',
'err_multi_ta.xml',
'unsupp_nonroot.xml',
'unsupp_xml_v11.xml'
}
-- Export static pages specified at command line
for _, name in ipairs(files) do
local fd = io.open(name)
assert(fd, string.format('unable to open file "%s"', name))
M.endpoints['/' .. name] = { 'text/xml', fd:read('*a') }
fd:close()
end
local server = M.add_interface({
host = 'localhost',
port = 8080,
tls = true,
cert = 'x509/server.pem',
key = 'x509/server-key.pem'
})
server:loop()
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