Commit 6887a4a2 authored by Marek Vavrusa's avatar Marek Vavrusa

modules: deprecated tinyweb, superseded by http

this module is superseded by http module, removing
parent 55520347
......@@ -55,4 +55,3 @@ kresd.amalg.c
libkres.amalg.c
/doc/kresd.8
/libkres.pc
/modules/tinyweb/tinyweb.h
......@@ -28,7 +28,6 @@ $(eval $(call find_lib,hiredis))
$(eval $(call find_lib,socket_wrapper))
$(eval $(call find_lib,libdnssec))
$(eval $(call find_lib,libsystemd))
$(eval $(call find_gopkg,geoip,github.com/abh/geoip))
# Find Go version and platform
GO_VERSION := $(shell $(GO) version 2>/dev/null)
......@@ -94,7 +93,6 @@ info:
$(info --------)
$(info [$(HAS_doxygen)] doxygen (doc))
$(info [$(HAS_go)] go (modules/go, Go buildmode=c-shared support))
$(info [$(HAS_geoip)] geoip (modules/tinyweb, github.com/abh/geoip))
$(info [$(HAS_libmemcached)] libmemcached (modules/memcached))
$(info [$(HAS_hiredis)] hiredis (modules/redis))
$(info [$(HAS_cmocka)] cmocka (tests/unit))
......
......@@ -49,7 +49,6 @@ There are also *optional* packages that enable specific functionality in Knot DN
"luasec_", "``trust anchors``", "TLS for Lua."
"libmemcached_", "``modules/memcached``", "To build memcached backend module."
"hiredis_", "``modules/redis``", "To build redis backend module."
"geoip_", "``modules/tinyweb``", "To build a proof-of-concept web interface (needs Go as well)."
"Go_ 1.5+", "``modules``", "Build modules written in Go."
"cmocka_", "``unit tests``", "Unit testing framework."
"Doxygen_", "``documentation``", "Generating API documentation."
......
......@@ -19,6 +19,5 @@ Knot DNS Resolver modules
.. include:: ../modules/kmemcached/README.rst
.. include:: ../modules/redis/README.rst
.. include:: ../modules/ketcd/README.rst
.. include:: ../modules/tinyweb/README.rst
.. include:: ../modules/dns64/README.rst
.. include:: ../modules/renumber/README.rst
......@@ -24,13 +24,6 @@ modules_TARGETS += ketcd \
daf
endif
# List of Golang modules
ifeq ($(HAS_go),yes)
ifeq ($(HAS_geoip),yes)
modules_TARGETS += tinyweb
endif
endif
# Make C module
define make_c_module
$(1)-install: $(DESTDIR)$(MODULEDIR)
......
.. _mod-tinyweb:
Web interface
-------------
This module provides an embedded web interface for resolver. It plots current performance in real-time,
including a feed of recent iterative queries. It also includes bindings_ to `MaxMind GeoIP`_, and presents a world map coloured by frequency of queries, so you can see where do your queries go.
The *stats* module is required for plotting query rate.
By default, it listens on ``localhost:8053``.
.. warning:: This is a proof of concept module for embedding Go, which has several drawbacks - it runs in separate threads, is relatively heavy-weight due to the nature of Go, and is opaque for other modules. Look at :ref:`http module <mod-http>` if you want to expose services over HTTP from other modules.
Examples
^^^^^^^^
.. code-block:: lua
-- Load web interface
modules = { 'tinyweb' }
-- Listen on specific address/port
modules = {
tinyweb = {
addr = 'localhost:8080', -- Custom address
geoip = '/usr/local/var/GeoIP' -- Different path to GeoIP DB
}
}
Dependencies
^^^^^^^^^^^^
It depends on Go 1.5+, `github.com/abh/geoip <bindings>`_ package.
.. code-block:: bash
$ <install> libgeoip
$ go get github.com/abh/geoip
.. _`MaxMind GeoIP`: https://www.maxmind.com/en/home
.. _bindings: https://github.com/abh/geoip
package main
/*
#include "lib/layer.h"
#include "lib/module.h"
#include "lib/utils.h"
#include <libknot/descriptor.h>
int consume(knot_layer_t *, knot_pkt_t *);
static inline const char *module_path(void)
{ return MODULEDIR; }
static inline const knot_layer_api_t *_layer(void)
{ static const knot_layer_api_t api = { .consume = &consume, }; return &api; }
*/
import "C"
import (
"os"
"runtime"
"unsafe"
"fmt"
"net"
"net/http"
"html"
"html/template"
"encoding/json"
"github.com/abh/geoip"
)
type QueryInfo struct {
Qname string
Qtype string
Addr string
Secure bool
Country string
}
// Global context
var resolver *C.struct_kr_context
// FIFO of last-seen metrics
var fifo_metrics [10] QueryInfo
var fifo_metrics_i = 0
// Geo frequency table
var geo_freq map[string] int
var geo_db *geoip.GeoIP
var geo_db6 *geoip.GeoIP
/*
* Callbacks for serving static content.
*/
func resource_path(filename string) string {
return C.GoString(C.module_path()) + "/tinyweb" + filename;
}
func serve_page(w http.ResponseWriter, r *http.Request) {
t, err := template.ParseFiles(resource_path("/tinyweb.tpl"))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
host, err := os.Hostname()
t.Execute(w, struct {
Title string
}{
Title: "kresd @ " + host,
})
w.Header().Set("Content-Type", "text/html; charset=utf-8")
}
func serve_file(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, resource_path(html.EscapeString(r.URL.Path)))
}
/*
* Serving dynamic contents.
*/
func serve_json(w http.ResponseWriter, r *http.Request, v interface{}) {
js, err := json.Marshal(v)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(js)
}
func serve_geo(w http.ResponseWriter, r *http.Request) {
serve_json(w, r, geo_freq)
}
func serve_feed(w http.ResponseWriter, r *http.Request) {
// Walk back FIFO to preserve ordering
const nsamples = len(fifo_metrics)
var samples [nsamples] QueryInfo
for i := 0; i < nsamples; i++ {
samples[i] = fifo_metrics[(nsamples + (fifo_metrics_i - i - 1)) % nsamples]
}
serve_json(w, r, samples)
}
func serve_stats(w http.ResponseWriter, r *http.Request) {
mod_name := C.CString("stats")
defer C.free(unsafe.Pointer(mod_name))
prop_name := C.CString("list")
defer C.free(unsafe.Pointer(prop_name))
out := C.kr_module_call(resolver, mod_name, prop_name, nil)
defer C.free(unsafe.Pointer(out))
if out != nil {
fmt.Fprintf(w, C.GoString(out))
} else {
http.Error(w, "No stats module", http.StatusInternalServerError)
}
}
/*
* Module implementation.
*/
func process_sample(qname string, qtype int, addr net.IP, secure bool) {
var qtype_str [16] byte
C.knot_rrtype_to_string(C.uint16_t(qtype), (*C.char)(unsafe.Pointer(&qtype_str[0])), C.size_t(16))
// Sample NS country code
var cc string
switch len(addr) {
case 4: if (geo_db != nil) { cc, _ = geo_db.GetCountry(addr.String()) }
case 16: if (geo_db6 != nil) { cc, _ = geo_db6.GetCountry_v6(addr.String()) }
default: return
}
// Count occurences
if freq, exists := geo_freq[cc]; exists {
geo_freq[cc] = freq + 1
} else {
geo_freq[cc] = 1
}
fifo_metrics[fifo_metrics_i] = QueryInfo{qname, string(qtype_str[:]), addr.String(), secure, cc}
fifo_metrics_i = (fifo_metrics_i + 1) % len(fifo_metrics)
}
//export tinyweb_init
func tinyweb_init(module *C.struct_kr_module) int {
resolver = (*C.struct_kr_context)(module.data)
geo_freq = make(map[string]int)
return 0
}
//export tinyweb_config
func tinyweb_config(module *C.struct_kr_module, conf *C.char) int {
var err error
var config map[string] interface{}
addr := "localhost:8053"
if err = json.Unmarshal([]byte(C.GoString(conf)), &config); err != nil {
fmt.Printf("[tinyweb] %s\n", err)
} else {
if v, ok := config["addr"]; ok {
addr = v.(string)
}
if v, ok := config["geoip"]; ok {
geoip.SetCustomDirectory(v.(string))
}
}
geo_db, err = geoip.OpenTypeFlag(geoip.GEOIP_COUNTRY_EDITION, geoip.GEOIP_MEMORY_CACHE)
if err != nil {
fmt.Printf("[tinyweb] couldn't open GeoIP IPv4 Country Edition\n");
}
geo_db6, err = geoip.OpenTypeFlag(geoip.GEOIP_COUNTRY_EDITION_V6, geoip.GEOIP_MEMORY_CACHE)
if err != nil {
fmt.Printf("[tinyweb] couldn't open GeoIP IPv6 Country Edition\n");
}
// Start web interface
http.HandleFunc("/feed", serve_feed)
http.HandleFunc("/stats", serve_stats)
http.HandleFunc("/geo", serve_geo)
http.HandleFunc("/tinyweb.js", serve_file)
http.HandleFunc("/datamaps.world.min.js", serve_file)
http.HandleFunc("/topojson.js", serve_file)
http.HandleFunc("/jquery.js", serve_file)
http.HandleFunc("/epoch.css", serve_file)
http.HandleFunc("/favicon.ico", serve_file)
http.HandleFunc("/epoch.js", serve_file)
http.HandleFunc("/d3.js", serve_file)
http.HandleFunc("/", serve_page)
// @todo Not sure how to cancel this routine yet
fmt.Printf("[tinyweb] listening on %s\n", addr)
go http.ListenAndServe(addr, nil)
return 0
}
//export tinyweb_deinit
func tinyweb_deinit(module *C.struct_kr_module) int {
geo_db = nil
geo_db6 = nil
runtime.GC()
return 0
}
//export consume
func consume(ctx *C.knot_layer_t, pkt *C.knot_pkt_t) C.int {
req := (*C.struct_kr_request)(ctx.data)
qry := req.current_query
state := (C.int)(ctx.state)
if qry.flags & C.QUERY_CACHED != 0 {
return state
}
// Parse answer source address
sa := (*C.struct_sockaddr)(unsafe.Pointer(&qry.ns.addr[0]))
var ip net.IP
if sa.sa_family == C.AF_INET {
sa_v4 := (*C.struct_sockaddr_in)(unsafe.Pointer(sa))
ip = net.IP(C.GoBytes(unsafe.Pointer(&sa_v4.sin_addr), 4))
} else if sa.sa_family == C.AF_INET6 {
sa_v6 := (*C.struct_sockaddr_in6)(unsafe.Pointer(sa))
ip = net.IP(C.GoBytes(unsafe.Pointer(&sa_v6.sin6_addr), 16))
}
// Parse metadata
qname := C.knot_dname_to_str_alloc(C.knot_pkt_qname(pkt))
defer C.free(unsafe.Pointer(qname))
qtype := C.knot_pkt_qtype(pkt)
secure := (bool)(C.knot_pkt_has_dnssec(pkt))
// Sample metric
process_sample(C.GoString(qname), int(qtype), ip, secure)
return state
}
//export tinyweb_layer
func tinyweb_layer(module *C.struct_kr_module) *C.knot_layer_api_t {
return C._layer()
}
//export tinyweb_api
func tinyweb_api() C.uint32_t {
return C.KR_MODULE_API
}
func main() {}
tinyweb_SOURCES := modules/tinyweb/tinyweb.go
tinyweb_INSTALL := $(wildcard modules/tinyweb/tinyweb/*)
tinyweb_DEPEND := $(libkres)
tinyweb_LIBS := $(libkres_TARGET) $(libkres_LIBS)
$(call make_go_module,tinyweb)
jQuery is provided under MIT license <https://jquery.org/license/>
D3 under BSD license <https://github.com/mbostock/d3/blob/master/LICENSE>
Epoch under MIT license <https://github.com/epochjs/epoch/blob/master/LICENSE>
TopoJSON under BSD license <https://github.com/mbostock/topojson/blob/master/LICENSE>
DataMaps under MIT license <https://github.com/markmarkoh/datamaps/blob/master/LICENSE>
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