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#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include "db.h"
#include "firebase.h"
#define JS_PLUGIN_PATH "firebase-io/firebase-io.js"
FILE *js_write=NULL;
static void write_field(FILE *f,const char *key,const char *value){
fprintf(f," %s %zu %s",key,strlen(value),value);
}
static void token_send(const char *token,const char *room,const char *user,const char *msg){
fprintf(js_write,"message");
write_field(js_write,"token",token);
write_field(js_write,"room",room);
write_field(js_write,"user",user);
write_field(js_write,"message",msg);
fprintf(js_write,"\n");
fflush(js_write);
}
static void script_output_listener(FILE *js_read){
// Do not use js_write here, it's NULL
char *line=NULL;
size_t linecap=0;
ssize_t linelen;
while((linelen=getline(&line,&linecap,js_read))>0){
if(line[linelen-1]!='\n'){
fprintf(stderr,"firebase thread: unexpected EOF from js script\n");
return;
}
line[linelen-1]='\0';
linelen--;
char *spacep=strchr(line,' ');
if(spacep==NULL)goto invalid_line;
*spacep='\0';
char *cmd=line;
if(strcmp(cmd,"add_token")==0||strcmp(cmd,"delete_token")==0){
char *username=spacep+1;
spacep=strchr(username,' ');
if(spacep==NULL)goto invalid_line;
*spacep='\0';
char *token=spacep+1;
i64 userid=db_find_user(username);
if(userid==-1){
fprintf(stderr,"firebase thread: unknown username '%s'\n",username);
continue;
}
if(strcmp(cmd,"add_token")==0){
db_add_token(userid,token);
} else {
db_delete_token(userid,token);
}
}
continue;
invalid_line:
fprintf(stderr,"firebase thread: Invalid line form js script: <%s>\n",line);
}
}
void firebase_init(void){
int wrpipe[2],rdpipe[2];
if(pipe(wrpipe)<0||pipe(rdpipe)<0){
perror("pipe");
exit(1);
}
pid_t pid=fork(); // The JS script
if(pid<0){
perror("fork");
exit(1);
}
if(pid==0){
close(wrpipe[1]);
close(rdpipe[0]);
dup2(wrpipe[0],0);
dup2(rdpipe[1],1);
execl(JS_PLUGIN_PATH,JS_PLUGIN_PATH,NULL);
perror("execl");
exit(1);
}
close(wrpipe[0]);
close(rdpipe[1]);
pid=fork(); // The script stdout listener
if(pid<0){
perror("fork");
exit(1);
}
if(pid==0){
close(wrpipe[1]);
FILE *js_read=fdopen(rdpipe[0],"r");
script_output_listener(js_read);
fclose(js_read);
exit(0);
}
js_write=fdopen(wrpipe[1],"w");
printf("Started js firebase plugin\n");
}
void firebase_stop(void){
// Script will stop itself on EOF on stdin
fclose(js_write);
}
void firebase_send_message(const char *room,i64 roomid,const char *user,const char *msg){
if(roomid==-1)roomid=db_find_room(room);
if(roomid==-1){
debug("firebase_send_message: Cannot find roomid for room '%s'",room);
return;
}
struct db_user_list members=db_list_members(roomid);
for(i64 i=0;i<members.count;i++){
struct db_strings_list tokens=db_user_tokens(members.list[i].id);
for(i64 j=0;j<tokens.count;j++){
token_send(tokens.list[j],room,user,msg);
}
db_nullify_strings_list(tokens);
}
db_nullify_user_list(members);
}
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