1 00:00:01,850 --> 00:00:08,300 So one thing we want to take care of before we can go live with this is to change the hard coded values 2 00:00:08,300 --> 00:00:13,240 we have in our application to be read instead from command line flags. 3 00:00:13,490 --> 00:00:19,400 So instead of running our application, as we do right now, so if we look at our run file, run S.H., 4 00:00:19,700 --> 00:00:25,010 instead of just running bookings, we're going to pass things like Debe name equals and then the database 5 00:00:25,010 --> 00:00:30,560 name, which would be bookings and user, which would be, in my case, TC's and some other things as 6 00:00:30,560 --> 00:00:30,880 well. 7 00:00:31,460 --> 00:00:33,590 And we're going to do that in our main Dargo. 8 00:00:34,220 --> 00:00:41,090 So for example, right here in the run function of our main Digo, I have app in production equals fault's 9 00:00:41,420 --> 00:00:42,590 with the note to myself. 10 00:00:42,590 --> 00:00:44,990 Changed this to true when in production. 11 00:00:45,020 --> 00:00:46,010 Well I don't want to do that. 12 00:00:46,010 --> 00:00:47,960 I don't want to recompile my application. 13 00:00:48,890 --> 00:00:53,090 One version for local development and another version for production environments. 14 00:00:53,240 --> 00:00:58,610 Instead, I want to read those values from the command line when I start the application and I'm going 15 00:00:58,610 --> 00:01:02,760 to do that right here just after I register things for the session. 16 00:01:02,780 --> 00:01:09,020 So in here I'll say red flags and obviously the first one I want is in production. 17 00:01:09,020 --> 00:01:14,300 So I'll create a variable in production and I'll sign that the value of and this is a built in package 18 00:01:14,300 --> 00:01:16,250 in the standard library Fleg. 19 00:01:17,000 --> 00:01:25,070 And I'm going to read the type of argument I'm going to read from the command line Izabel and the value 20 00:01:25,070 --> 00:01:26,840 I'm going to look for is production. 21 00:01:27,260 --> 00:01:28,970 So that's what I'll be typing with. 22 00:01:28,970 --> 00:01:35,030 A hyphen are like dash production equals true or false from the command line that will have a default 23 00:01:35,030 --> 00:01:36,850 value of true. 24 00:01:36,890 --> 00:01:41,090 So if you don't specify it, it will be set to true to be in production, which is always safe, or 25 00:01:41,100 --> 00:01:45,440 you don't want to accidentally set something into development mode on a live server. 26 00:01:45,830 --> 00:01:51,860 And then just the note that tells the user what the flag is for application is in production. 27 00:01:54,150 --> 00:01:55,650 So that's the first value I want. 28 00:01:55,970 --> 00:01:57,670 The second one is our cash. 29 00:01:57,680 --> 00:01:59,710 Are we going to cash our templates or not? 30 00:01:59,720 --> 00:02:07,010 So I'll just call this use cache and the command line flag will be cache. 31 00:02:07,010 --> 00:02:08,420 The default will be true. 32 00:02:08,900 --> 00:02:14,840 And the note to the user will be cache templates or use template cache. 33 00:02:17,720 --> 00:02:19,720 OK, so we have two variables right now. 34 00:02:19,730 --> 00:02:21,500 One for in production and one for true. 35 00:02:21,930 --> 00:02:26,750 Now, the next thing I want of course, is to specify my database information because again, I don't 36 00:02:26,750 --> 00:02:29,120 want a hard code that into the application. 37 00:02:29,690 --> 00:02:33,680 So we need the DB name, the name of the database. 38 00:02:34,010 --> 00:02:42,310 That will be a flag string and we'll call this one DB name and we'll have no default value for that. 39 00:02:42,320 --> 00:02:50,900 We'll make that a required field and we'll just put the note database name and the database user DB 40 00:02:50,930 --> 00:02:51,500 user. 41 00:02:54,350 --> 00:02:58,790 Database user, the password Debe Pass. 42 00:03:02,680 --> 00:03:11,320 Password, and we also want the port divi port, and I'll use that as a string, even though it's it's 43 00:03:11,320 --> 00:03:14,250 a numeric value is string is fine for this case. 44 00:03:14,740 --> 00:03:17,350 So I call this DB port. 45 00:03:18,070 --> 00:03:21,370 I just to be consistent, I'll make everything lowercase for the flags. 46 00:03:23,260 --> 00:03:29,020 So D.V. Port and I'm going to add one more here as well, which we haven't used yet, but in production, 47 00:03:29,020 --> 00:03:33,790 quite often your connection to the database is using an SSL certificate. 48 00:03:33,790 --> 00:03:40,900 So we'll specify DB, SSL and we'll make that have a default value of disable just so I don't have to 49 00:03:40,900 --> 00:03:42,570 retype it or put a command line. 50 00:03:42,580 --> 00:03:45,400 Feigin So database SSL settings 51 00:03:48,520 --> 00:03:56,020 and for postgrads the possible values are disable, which will be the default prefer using SSL certificate 52 00:03:56,290 --> 00:03:58,780 if it exists or require. 53 00:03:58,840 --> 00:04:02,290 Don't start unless you have an SSL certificate on the database server. 54 00:04:03,430 --> 00:04:08,290 Now other things I'm going to put in here, I'll make the database port default to five, four, three, 55 00:04:08,290 --> 00:04:13,270 two and I'll make the database host, which I didn't specify yet. 56 00:04:13,270 --> 00:04:14,200 So I better do that. 57 00:04:15,070 --> 00:04:19,480 We need to have a DB host, DB host. 58 00:04:20,260 --> 00:04:27,700 I'll just default that to localhost database post because sometimes you don't have the database on the 59 00:04:27,700 --> 00:04:30,280 same machine as your application server. 60 00:04:30,280 --> 00:04:35,860 Actually in production you rarely have the database on the same server as your your web app. 61 00:04:35,950 --> 00:04:39,540 So that would be in a different host and you need to be able to specify that. 62 00:04:39,550 --> 00:04:44,500 So I've got those all specified right now and they exist and they exist as pointers because that's how 63 00:04:44,500 --> 00:04:46,110 things are run from the command line. 64 00:04:46,990 --> 00:04:52,180 But before I can do anything with those at all, I have to call flag dot pers. 65 00:04:53,080 --> 00:04:58,210 Now, these values will actually be passed and they'll be useful to our application. 66 00:04:59,200 --> 00:05:02,020 So now that I have these specified, I can make a few changes. 67 00:05:02,020 --> 00:05:08,020 So for example, instead of saying APTA introduction equals false, I can just say DOT in production 68 00:05:08,590 --> 00:05:17,320 is equal to because it's a pointer pointer in production and I can do the same thing for app to use 69 00:05:17,320 --> 00:05:17,920 cash. 70 00:05:18,890 --> 00:05:24,560 I think it's called use cash, yes, and the variable in this case is use cash. 71 00:05:26,030 --> 00:05:28,280 Now, do I have that anywhere down here? 72 00:05:29,610 --> 00:05:31,260 Yes, so I need to get rid of this. 73 00:05:33,240 --> 00:05:36,400 So those are set up now, what about our database stuff? 74 00:05:36,420 --> 00:05:37,790 Well, that's all right here. 75 00:05:37,800 --> 00:05:42,930 So instead of just passing a string in like this, let's create a new string, a new variable called 76 00:05:42,930 --> 00:05:43,620 connection string, 77 00:05:46,590 --> 00:05:51,660 and that will be assigned the value of the format as predictive. 78 00:05:52,830 --> 00:05:54,720 And it will be the same thing we have here. 79 00:05:54,750 --> 00:05:58,560 So let me just copy this, but with placeholders. 80 00:06:01,730 --> 00:06:10,250 And I guess I got an extra quote in there that looks better and we're going to put in the very first 81 00:06:10,250 --> 00:06:14,210 thing will be a string, which will be TV host. 82 00:06:14,870 --> 00:06:22,340 So I have to use the star because it's a pointer DB host, and the next thing will be the port. 83 00:06:27,870 --> 00:06:31,500 Do you report and then the DB name? 84 00:06:37,010 --> 00:06:38,300 And then the TV user. 85 00:06:43,430 --> 00:06:44,540 And then the password. 86 00:06:49,670 --> 00:06:53,270 And then the one we just added, which is called SSL mode 87 00:06:56,360 --> 00:06:59,350 along the line, but not much I can do about it. 88 00:07:03,380 --> 00:07:08,880 All right, so that's our connection string now we'll just replace this with connection string. 89 00:07:09,870 --> 00:07:17,960 OK, so if this works properly, we should be able to specify all of the necessary connection, strings 90 00:07:17,960 --> 00:07:21,220 or command line parameters in our run DSH. 91 00:07:21,890 --> 00:07:23,060 So let's put those in there. 92 00:07:23,060 --> 00:07:28,220 So we have D.V. name, we have DBI user will say cache equals fault's. 93 00:07:28,580 --> 00:07:32,810 There's no Comus will say production equals faults. 94 00:07:33,890 --> 00:07:37,250 And we have the DB name, we have the user. 95 00:07:37,610 --> 00:07:38,780 That should be enough. 96 00:07:38,810 --> 00:07:44,510 Now there's one other thing I want to add here, and that is what if you try to start the application 97 00:07:44,510 --> 00:07:49,070 but you haven't specified all of the necessary required parameters? 98 00:07:49,100 --> 00:07:52,640 Well, we can do that right here after we pass our flag. 99 00:07:53,660 --> 00:07:56,150 So DB Pass looks like I missed something here. 100 00:07:56,160 --> 00:07:59,090 Do user to be poor TB's so password's. 101 00:07:59,090 --> 00:08:02,570 So one, two, three, four, five. 102 00:08:02,750 --> 00:08:05,840 One, two, three, four, five. 103 00:08:05,860 --> 00:08:09,740 Oh should be do doing pass by. 104 00:08:09,740 --> 00:08:11,990 Idy helpfully told me that I missed a variable. 105 00:08:11,990 --> 00:08:12,970 So that's those. 106 00:08:13,220 --> 00:08:14,750 Those should all be correct now. 107 00:08:14,750 --> 00:08:20,360 But after we pass the flag right here, let's make sure that they've specified all of the necessary 108 00:08:21,650 --> 00:08:22,790 required flags. 109 00:08:22,790 --> 00:08:31,220 So if you need to have DB name, so DB name is equal to nothing or. 110 00:08:31,610 --> 00:08:33,030 And what are the required flags. 111 00:08:33,050 --> 00:08:36,320 Do we have here db user DB pass. 112 00:08:36,320 --> 00:08:40,520 We can leave empty because we don't have a password in our production environment or development environment. 113 00:08:41,410 --> 00:08:45,590 I think the only other one we need is our DB user. 114 00:08:48,950 --> 00:09:00,050 If that's equal to nothing, then format that print line missing, required flags and then will just 115 00:09:00,050 --> 00:09:00,440 exit. 116 00:09:05,890 --> 00:09:08,330 With a code of one that should stop the application. 117 00:09:08,800 --> 00:09:13,300 So if I try running this right now, first of all, let's just get rid of these parameters that we specified 118 00:09:13,310 --> 00:09:14,440 and we'll see what happens. 119 00:09:14,470 --> 00:09:15,520 So let me cut those. 120 00:09:15,550 --> 00:09:17,320 So they're on the clipboard and I won't lose them. 121 00:09:17,770 --> 00:09:18,910 And let's try running this 122 00:09:22,540 --> 00:09:23,230 in the right direction. 123 00:09:23,260 --> 00:09:24,310 I am so run. 124 00:09:26,740 --> 00:09:29,530 And it should say missing required flags, and it does. 125 00:09:29,680 --> 00:09:31,090 Now let's go paste them back in 126 00:09:35,080 --> 00:09:39,040 and try writing it again and there it is running. 127 00:09:39,310 --> 00:09:41,770 We're all connected in the database, so let's make sure it works. 128 00:09:49,160 --> 00:09:54,630 And go to localhost 80, 80, and it works. 129 00:09:54,650 --> 00:09:55,460 Can I log in? 130 00:10:01,540 --> 00:10:07,500 And I can and I should see things on the dashboard, and I do perfect. 131 00:10:07,810 --> 00:10:15,310 OK, so now we can just by changing our run script, we can have our product or our code run in properly 132 00:10:15,310 --> 00:10:18,760 in production, and we can have our code run properly in our development environment. 133 00:10:18,940 --> 00:10:22,930 And that makes a lot more sense than hard coding things into our source code.