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martonmiklos: Add GZIP compression for static files

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v0.9.0
Jeroen Domburg 10 years ago
parent 48a017c029
commit 3cb7b32678
4 changed files with 88 additions and 2 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 29
      Makefile
  2. 46
      user/httpd.c
  3. 4
      user/httpd.h
  4. 11
      user/httpdespfs.c

29
Makefile
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@ -38,6 +38,20 @@ EXTRA_INCDIR = include \
# libraries used in this project, mainly provided by the SDK
LIBS = c gcc hal phy pp net80211 wpa main lwip
# If GZIP_COMPRESSION is set to "yes" then the static css, js, and html files will be compressed with gzip before added to the espfs image
# and will be served with gzip Content-Encoding header.
# This could speed up the downloading of these files, but might break compatibility with older web browsers not supporting gzip encoding
# because Accept-Encoding is simply ignored. Enable this option if you have large static files to serve (for e.g. JQuery, Twitter bootstrap)
# By default only js, css and html files are compressed.
# If you have text based static files with different extensions what you want to serve compressed then you will need to add the extension to the following places:
# - Add the extension to this Makefile at the webpages.espfs target to the find command
# - Add the extension to the gzippedFileTypes array in the user/httpd.c file
#
# Adding JPG or PNG files (and any other compressed formats) is not recommended, because GZIP compression does not works effectively on compressed files.
#Static gzipping is disabled by default.
#GZIP_COMPRESSION = "yes"
# compiler flags using during compilation of source files
CFLAGS = -Os -ggdb -std=c99 -Werror -Wpointer-arith -Wundef -Wall -Wl,-EL -fno-inline-functions \
-nostdlib -mlongcalls -mtext-section-literals -D__ets__ -DICACHE_FLASH \
@ -101,6 +115,10 @@ Q := @
vecho := @echo
endif
ifeq ($(GZIP_COMPRESSION),"yes")
CFLAGS += -DGZIP_COMPRESSION
endif
vpath %.c $(SRC_DIR)
define compile-objects
@ -144,8 +162,15 @@ flash: $(FW_FILE_1) $(FW_FILE_2)
$(Q) $(ESPTOOL) -cp $(ESPPORT) -cb $(ESPBAUD) -ca 0x40000 -cf firmware/0x40000.bin -v
webpages.espfs: html/ html/wifi/ mkespfsimage/mkespfsimage
cd html; find . | ../mkespfsimage/mkespfsimage > ../webpages.espfs; cd ..
ifeq ($(GZIP_COMPRESSION),"yes")
$(Q) rm -rf html_compressed;
$(Q) cp -r html html_compressed;
$(Q) cd html_compressed; find . -type f -regex ".*/.*\.\(html\|css\|js\)" -exec sh -c "gzip -n {}; mv {}.gz {}" \;; cd ..;
$(Q) cd html_compressed; find | ../mkespfsimage/mkespfsimage > ../webpages.espfs; cd ..;
$(Q) awk "BEGIN {printf \"GZIP compression ratio was: %.2f%%\\n\", (`du -b -s html_compressed/ | sed 's/\([0-9]*\).*/\1/'`/`du -b -s html/ | sed 's/\([0-9]*\).*/\1/'`)*100}"
else
$(Q) cd html; find | ../mkespfsimage/mkespfsimage > ../webpages.espfs; cd ..
endif
mkespfsimage/mkespfsimage: mkespfsimage/
make -C mkespfsimage

46
user/httpd.c
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@ -75,6 +75,19 @@ static const MimeMap mimeTypes[]={
{NULL, "text/html"}, //default value
};
// The static files with the following extensions from the HTML folder will be compressed and served with GZIP compression
// Add any other file types you want compressed here (and don't forget to modify the Makefile too)
#ifdef GZIP_COMPRESSION
static const char * gzippedFileTypes[] = {
"js",
"html",
"css",
NULL
};
static const char gzipNonSupportedMessage[] = "<html><head></head><body>Your browser does not accept gzip-compressed data.</body></html>";
#endif
//Returns a static char* to a mime type for a given url to a file.
const char ICACHE_FLASH_ATTR *httpdGetMimetype(char *url) {
int i=0;
@ -88,6 +101,39 @@ const char ICACHE_FLASH_ATTR *httpdGetMimetype(char *url) {
return mimeTypes[i].mimetype;
}
#ifdef GZIP_COMPRESSION
//Sends Content-encoding header if the requested file was GZIP compressed
//If the client does not sent the Accept-encoding, send out a static html message.
const char* sendGZIPEncodingIfNeeded(HttpdConnData *connData) {
int i=0;
char acceptEncodingBuffer[64];
//Go find the extension
char *ext=connData->url+(strlen(connData->url)-1);
while (ext!=connData->url && *ext!='.') ext--;
if (*ext=='.') ext++;
//ToDo: os_strcmp is case sensitive; we may want to do case-intensive matching here...
while (gzippedFileTypes[i]!=NULL) {
if (os_strcmp(ext, gzippedFileTypes[i])==0) {
//when serving gzipped files check the browser's "Accept-Encoding" header
//if the client does not advertises that he accepts GZIP send a warning message (telnet users for e.g.)
httpdGetHeader(connData, "Accept-Encoding", acceptEncodingBuffer, 64);
if (os_strstr(acceptEncodingBuffer, "gzip") == NULL) {
//No Accept-Encoding: gzip header present
return gzipNonSupportedMessage;
} else {
httpdHeader(connData, "Content-Encoding", "gzip");
return NULL;
}
}
i++;
}
return NULL;
}
#endif
//Looks up the connData info for a specific esp connection
static HttpdConnData ICACHE_FLASH_ATTR *httpdFindConnData(void *arg) {
int i;

4
user/httpd.h
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@ -14,6 +14,7 @@
#define HTTPD_METHOD_GET 1
#define HTTPD_METHOD_POST 2
typedef struct HttpdPriv HttpdPriv;
typedef struct HttpdConnData HttpdConnData;
typedef struct HttpdPostData HttpdPostData;
@ -58,6 +59,9 @@ int httpdUrlDecode(char *val, int valLen, char *ret, int retLen);
int ICACHE_FLASH_ATTR httpdFindArg(char *line, char *arg, char *buff, int buffLen);
void ICACHE_FLASH_ATTR httpdInit(HttpdBuiltInUrl *fixedUrls, int port);
const char *httpdGetMimetype(char *url);
#ifdef GZIP_COMPRESSION
const char* sendGZIPEncodingIfNeeded(HttpdConnData *connData);
#endif
void ICACHE_FLASH_ATTR httpdStartResponse(HttpdConnData *conn, int code);
void ICACHE_FLASH_ATTR httpdHeader(HttpdConnData *conn, const char *field, const char *val);
void ICACHE_FLASH_ATTR httpdEndHeaders(HttpdConnData *conn);

11
user/httpdespfs.c
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@ -31,6 +31,9 @@ int ICACHE_FLASH_ATTR cgiEspFsHook(HttpdConnData *connData) {
EspFsFile *file=connData->cgiData;
int len;
char buff[1024];
#ifdef GZIP_COMPRESSION
const char *gzipSendResult = NULL;
#endif
if (connData->conn==NULL) {
//Connection aborted. Clean up.
@ -47,6 +50,14 @@ int ICACHE_FLASH_ATTR cgiEspFsHook(HttpdConnData *connData) {
connData->cgiData=file;
httpdStartResponse(connData, 200);
httpdHeader(connData, "Content-Type", httpdGetMimetype(connData->url));
#ifdef GZIP_COMPRESSION
gzipSendResult = sendGZIPEncodingIfNeeded(connData);
if (gzipSendResult != NULL) {
httpdEndHeaders(connData);
httpdSend(connData, gzipSendResult, os_strlen(gzipSendResult));
return HTTPD_CGI_DONE;
}
#endif
httpdHeader(connData, "Cache-Control", "max-age=3600, must-revalidate");
httpdEndHeaders(connData);
return HTTPD_CGI_MORE;

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