The code and data behind xeiaso.net
lume/notes: add go pointer conversion note
Signed-off-by: Xe Iaso <me@xeiaso.net>
+158
-43
-7
.github/workflows/tigris-push.yml
-7
.github/workflows/tigris-push.yml
···
44
44
path: |
45
45
/home/runner/.cache/deno
46
46
47
-
- name: Tailscale
48
-
uses: tailscale/github-action@v2
49
-
with:
50
-
oauth-client-id: ${{ secrets.TAILSCALE_CLIENT_ID }}
51
-
oauth-secret: ${{ secrets.TAILSCALE_CLIENT_SECRET }}
52
-
tags: tag:ci
53
-
54
47
- name: Build and deploy xesite
55
48
run: |
56
49
go run ./cmd/fabricate-generation
+31
-31
Brewfile.lock.json
+31
-31
Brewfile.lock.json
···
618
618
}
619
619
},
620
620
"flyctl": {
621
-
"version": "0.2.114",
621
+
"version": "0.2.125",
622
622
"bottle": {
623
623
"rebuild": 0,
624
624
"root_url": "https://ghcr.io/v2/homebrew/core",
625
625
"files": {
626
626
"arm64_sonoma": {
627
627
"cellar": ":any_skip_relocation",
628
-
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:bd5ebc9e5d62ae0bd61fc881e23b905b7c987cedf16f51c36224b798964c76b5",
629
-
"sha256": "bd5ebc9e5d62ae0bd61fc881e23b905b7c987cedf16f51c36224b798964c76b5"
628
+
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:54bfeca205000c73e6b4642f78acd49c24abb60e532189ed0549eec31c36f142",
629
+
"sha256": "54bfeca205000c73e6b4642f78acd49c24abb60e532189ed0549eec31c36f142"
630
630
},
631
631
"arm64_ventura": {
632
632
"cellar": ":any_skip_relocation",
633
-
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:bd5ebc9e5d62ae0bd61fc881e23b905b7c987cedf16f51c36224b798964c76b5",
634
-
"sha256": "bd5ebc9e5d62ae0bd61fc881e23b905b7c987cedf16f51c36224b798964c76b5"
633
+
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:54bfeca205000c73e6b4642f78acd49c24abb60e532189ed0549eec31c36f142",
634
+
"sha256": "54bfeca205000c73e6b4642f78acd49c24abb60e532189ed0549eec31c36f142"
635
635
},
636
636
"arm64_monterey": {
637
637
"cellar": ":any_skip_relocation",
638
-
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:bd5ebc9e5d62ae0bd61fc881e23b905b7c987cedf16f51c36224b798964c76b5",
639
-
"sha256": "bd5ebc9e5d62ae0bd61fc881e23b905b7c987cedf16f51c36224b798964c76b5"
638
+
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:54bfeca205000c73e6b4642f78acd49c24abb60e532189ed0549eec31c36f142",
639
+
"sha256": "54bfeca205000c73e6b4642f78acd49c24abb60e532189ed0549eec31c36f142"
640
640
},
641
641
"sonoma": {
642
642
"cellar": ":any_skip_relocation",
643
-
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:55b2da7831031681b0680295073a382e0306cd8c4a3feac0d81b22b34e05b8fe",
644
-
"sha256": "55b2da7831031681b0680295073a382e0306cd8c4a3feac0d81b22b34e05b8fe"
643
+
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:a335cf7168b566f0d7fb67a1f954bdcde0c03df38e49787b5b73efdc5f6acd26",
644
+
"sha256": "a335cf7168b566f0d7fb67a1f954bdcde0c03df38e49787b5b73efdc5f6acd26"
645
645
},
646
646
"ventura": {
647
647
"cellar": ":any_skip_relocation",
648
-
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:55b2da7831031681b0680295073a382e0306cd8c4a3feac0d81b22b34e05b8fe",
649
-
"sha256": "55b2da7831031681b0680295073a382e0306cd8c4a3feac0d81b22b34e05b8fe"
648
+
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:a335cf7168b566f0d7fb67a1f954bdcde0c03df38e49787b5b73efdc5f6acd26",
649
+
"sha256": "a335cf7168b566f0d7fb67a1f954bdcde0c03df38e49787b5b73efdc5f6acd26"
650
650
},
651
651
"monterey": {
652
652
"cellar": ":any_skip_relocation",
653
-
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:55b2da7831031681b0680295073a382e0306cd8c4a3feac0d81b22b34e05b8fe",
654
-
"sha256": "55b2da7831031681b0680295073a382e0306cd8c4a3feac0d81b22b34e05b8fe"
653
+
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:a335cf7168b566f0d7fb67a1f954bdcde0c03df38e49787b5b73efdc5f6acd26",
654
+
"sha256": "a335cf7168b566f0d7fb67a1f954bdcde0c03df38e49787b5b73efdc5f6acd26"
655
655
},
656
656
"x86_64_linux": {
657
657
"cellar": ":any_skip_relocation",
658
-
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:94fb1a2d402c31465879b6f5d04434a633f1a5b4b02edc0f17784c453bd7b71d",
659
-
"sha256": "94fb1a2d402c31465879b6f5d04434a633f1a5b4b02edc0f17784c453bd7b71d"
658
+
"url": "https://ghcr.io/v2/homebrew/core/flyctl/blobs/sha256:b61a528c47f2c3712619a73cbbec7d5be15980b5bee0ac712faac559b4c57877",
659
+
"sha256": "b61a528c47f2c3712619a73cbbec7d5be15980b5bee0ac712faac559b4c57877"
660
660
}
661
661
}
662
662
}
···
664
664
"go@1.23": {
665
665
"version": "1.23.0",
666
666
"bottle": {
667
-
"rebuild": 0,
667
+
"rebuild": 1,
668
668
"root_url": "https://ghcr.io/v2/homebrew/core",
669
669
"files": {
670
670
"arm64_sonoma": {
671
671
"cellar": "/opt/homebrew/Cellar",
672
-
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:9ae04e3063ff69c93dff6e982d93ed8c07114cdd50db418ddbb514c0f3cbb0a2",
673
-
"sha256": "9ae04e3063ff69c93dff6e982d93ed8c07114cdd50db418ddbb514c0f3cbb0a2"
672
+
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:5cc408349e666ae1c8ee789d057990f523a0cb8cc51919a913eb0df64e410d43",
673
+
"sha256": "5cc408349e666ae1c8ee789d057990f523a0cb8cc51919a913eb0df64e410d43"
674
674
},
675
675
"arm64_ventura": {
676
676
"cellar": "/opt/homebrew/Cellar",
677
-
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:9ae04e3063ff69c93dff6e982d93ed8c07114cdd50db418ddbb514c0f3cbb0a2",
678
-
"sha256": "9ae04e3063ff69c93dff6e982d93ed8c07114cdd50db418ddbb514c0f3cbb0a2"
677
+
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:5cc408349e666ae1c8ee789d057990f523a0cb8cc51919a913eb0df64e410d43",
678
+
"sha256": "5cc408349e666ae1c8ee789d057990f523a0cb8cc51919a913eb0df64e410d43"
679
679
},
680
680
"arm64_monterey": {
681
681
"cellar": "/opt/homebrew/Cellar",
682
-
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:9ae04e3063ff69c93dff6e982d93ed8c07114cdd50db418ddbb514c0f3cbb0a2",
683
-
"sha256": "9ae04e3063ff69c93dff6e982d93ed8c07114cdd50db418ddbb514c0f3cbb0a2"
682
+
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:5cc408349e666ae1c8ee789d057990f523a0cb8cc51919a913eb0df64e410d43",
683
+
"sha256": "5cc408349e666ae1c8ee789d057990f523a0cb8cc51919a913eb0df64e410d43"
684
684
},
685
685
"sonoma": {
686
686
"cellar": "/usr/local/Cellar",
687
-
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:78c91083ca44ee58e1eeb70286ead1564f44f570aeba12c5a7a981c059cc28a2",
688
-
"sha256": "78c91083ca44ee58e1eeb70286ead1564f44f570aeba12c5a7a981c059cc28a2"
687
+
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:68252d4fc1abb13c66c9ee088c1f97628beecac65b6c1223cf72dd517adab1b1",
688
+
"sha256": "68252d4fc1abb13c66c9ee088c1f97628beecac65b6c1223cf72dd517adab1b1"
689
689
},
690
690
"ventura": {
691
691
"cellar": "/usr/local/Cellar",
692
-
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:78c91083ca44ee58e1eeb70286ead1564f44f570aeba12c5a7a981c059cc28a2",
693
-
"sha256": "78c91083ca44ee58e1eeb70286ead1564f44f570aeba12c5a7a981c059cc28a2"
692
+
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:68252d4fc1abb13c66c9ee088c1f97628beecac65b6c1223cf72dd517adab1b1",
693
+
"sha256": "68252d4fc1abb13c66c9ee088c1f97628beecac65b6c1223cf72dd517adab1b1"
694
694
},
695
695
"monterey": {
696
696
"cellar": "/usr/local/Cellar",
697
-
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:78c91083ca44ee58e1eeb70286ead1564f44f570aeba12c5a7a981c059cc28a2",
698
-
"sha256": "78c91083ca44ee58e1eeb70286ead1564f44f570aeba12c5a7a981c059cc28a2"
697
+
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:68252d4fc1abb13c66c9ee088c1f97628beecac65b6c1223cf72dd517adab1b1",
698
+
"sha256": "68252d4fc1abb13c66c9ee088c1f97628beecac65b6c1223cf72dd517adab1b1"
699
699
},
700
700
"x86_64_linux": {
701
701
"cellar": "/home/linuxbrew/.linuxbrew/Cellar",
702
-
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:7ce2a2f4ebb0c620f909da574fe88b8abcf09e1c7e6acd6eb5f486a1931697c4",
703
-
"sha256": "7ce2a2f4ebb0c620f909da574fe88b8abcf09e1c7e6acd6eb5f486a1931697c4"
702
+
"url": "https://ghcr.io/v2/homebrew/core/go/blobs/sha256:8dc5e2fbbb380bd1b1f41b2be7bd1faa61b8d071231d4b193a23f1e6353f28ef",
703
+
"sha256": "8dc5e2fbbb380bd1b1f41b2be7bd1faa61b8d071231d4b193a23f1e6353f28ef"
704
704
}
705
705
}
706
706
}
···
731
731
"GCC": "11.4.0"
732
732
},
733
733
"Ubuntu 22.04.3 LTS (jammy)": {
734
-
"HOMEBREW_VERSION": "4.3.17",
734
+
"HOMEBREW_VERSION": "4.3.19",
735
735
"HOMEBREW_PREFIX": "/home/linuxbrew/.linuxbrew",
736
736
"Homebrew/homebrew-core": "api",
737
737
"GCC": "11.4.0"
+5
-4
cmd/fabricate-generation/main.go
+5
-4
cmd/fabricate-generation/main.go
···
29
29
var (
30
30
bucketName = flag.String("bucket-name", "xesite", "Name of the S3 bucket to upload to")
31
31
githubSHA = flag.String("github-sha", "", "GitHub SHA to use for the site")
32
-
miURL = flag.String("mimi-announce-url", "", "Mi url (named mimi-announce-url for historical reasons)")
32
+
miURL = flag.String("mimi-announce-url", "", "Mi url")
33
33
patreonSaasProxyURL = flag.String("patreon-saasproxy-url", "http://xesite-patreon-saasproxy.flycast", "URL to use for the patreon saasproxy")
34
34
siteURL = flag.String("site-url", "https://xeiaso.net/", "URL to use for the site")
35
35
)
···
52
52
if err != nil {
53
53
log.Fatal(err)
54
54
}
55
+
_ = s3c
55
56
56
57
fs, err := lume.New(context.Background(), &lume.Options{
57
58
Branch: "main",
···
69
70
70
71
defer fs.Close()
71
72
72
-
if err := uploadFolderToS3(context.Background(), s3c, "./var/repo/lume/_site", *bucketName); err != nil {
73
-
log.Fatal(err)
74
-
}
73
+
// if err := uploadFolderToS3(context.Background(), s3c, "./var/repo/lume/_site", *bucketName); err != nil {
74
+
// log.Fatal(err)
75
+
// }
75
76
}
76
77
77
78
func NewPatreonClient(hc *http.Client) (*patreon.Client, error) {
+22
dhall/jobHistory.dhall
+22
dhall/jobHistory.dhall
···
80
80
}
81
81
}
82
82
83
+
let xeserv =
84
+
Company::{
85
+
, name = "Xeserv"
86
+
, url = Some "https://xeserv.us"
87
+
, tagline = "Uber for developer marketing consulting"
88
+
, location = ottawa
89
+
}
90
+
83
91
in [ Job::{
92
+
, company = xeserv
93
+
, title = "Chief Executive Officer"
94
+
, startDate = "2024-08-30"
95
+
, salary = annualCAD 150000
96
+
, locations = [ ottawa ]
97
+
, highlights =
98
+
[ "Developer relations"
99
+
, "Content creation"
100
+
, "Technical writing"
101
+
, "Video production"
102
+
, "Generative AI consulting"
103
+
]
104
+
}
105
+
, Job::{
84
106
, company = flyio
85
107
, title = "Senior Technophilosopher"
86
108
, startDate = "2024-01-07"
+98
lume/src/notes/2024/go-pointer-constant.mdx
+98
lume/src/notes/2024/go-pointer-constant.mdx
···
1
+
---
2
+
title: "Getting a pointer to a constant in Go"
3
+
desc: "From least to most hacky"
4
+
date: 2024-11-25
5
+
---
6
+
7
+
In Go, sometimes you need to get a pointer to a constant value. This is normally easy, but only if you have a _value_, not a _constant_. Let's say you or a friend are dealing with the AWS S3 API and you need to pass a value to one of the parameters:
8
+
9
+
```go
10
+
_, err = s3c.PutObject(ctx, &s3.PutObjectInput{
11
+
Bucket: "mah-bukkit",
12
+
Key: "something",
13
+
Body: bytes.NewReader(fileContent),
14
+
})
15
+
```
16
+
17
+
Doing this gets you a compile error, because you need a _pointer_ to the string.
18
+
19
+
There's several ways to work around this. I'm going to go over them in order from least to most hacky.
20
+
21
+
## Make those constants into values
22
+
23
+
You can make a pointer to a value, but not a constant. Lift the bucket name and key values into variables:
24
+
25
+
```go
26
+
bucketName := "mah-bukkit"
27
+
key := "something"
28
+
29
+
_, err = s3c.PutObject(ctx, &s3.PutObjectInput{
30
+
Bucket: &bucketName,
31
+
Key: &key,
32
+
Body: bytes.NewReader(fileContent),
33
+
})
34
+
```
35
+
36
+
This works in most cases, but you have to declare variables every time. This can look odd.
37
+
38
+
## The `aws.String` / `aws.Type` functions:
39
+
40
+
The [`aws` package](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2) exposes some [helper functions](https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/aws#hdr-Value_and_Pointer_Conversion_Utilities) that do this conversion for you. You'll see these in the example code:
41
+
42
+
```go
43
+
_, err = s3c.PutObject(ctx, &s3.PutObjectInput{
44
+
Bucket: aws.String("mah-bukkit"),
45
+
Key: aws.String("something"),
46
+
Body: bytes.NewReader(fileContent),
47
+
})
48
+
```
49
+
50
+
This works because function arguments are treated as values:
51
+
52
+
```go
53
+
package aws
54
+
55
+
func String(val string) *string {
56
+
return &val
57
+
}
58
+
```
59
+
60
+
## Making your own generic pointer to anything function
61
+
62
+
Something else you can do is use Go generics to make a "get me the pointer of this" function:
63
+
64
+
```go
65
+
func p[T any](val T) (*T) {
66
+
return &val
67
+
}
68
+
```
69
+
70
+
Then you can use it as normal:
71
+
72
+
```go
73
+
_, err = s3c.PutObject(ctx, &s3.PutObjectInput{
74
+
Bucket: p("mah-bukkit"),
75
+
Key: p("something"),
76
+
Body: bytes.NewReader(fileContent),
77
+
})
78
+
```
79
+
80
+
## The Kubernetes trick
81
+
82
+
Making variables and passing things as arguments to functions aren't the only way to do this, there's also a trick I learned by reading Kubernetes source code. I'll paste an example and then explain how it works:
83
+
84
+
```go
85
+
raised := &[]string{"foo"}[0]
86
+
```
87
+
88
+
This works by creating an anonymous string slice with one member `"foo"`, grabs the first element of that slice, and gets the pointer to it. This makes the code look kinda cursed:
89
+
90
+
```go
91
+
_, err = s3c.PutObject(ctx, &s3.PutObjectInput{
92
+
Bucket: &[]string{"mah-bukkit"}[0],
93
+
Key: &[]string{"something"}[0],
94
+
Body: bytes.NewReader(fileContent),
95
+
})
96
+
```
97
+
98
+
However every step in this is perfectly logical.