Add concurrency in content API

[harry-hov]

No description provided.

[harry-hov]

Blocker: go-git doesn't support concurrency.

[harry-hov]

2022/07/29 12:20:54 request: POST localhost:5050/content
fatal error: concurrent map writes
fatal error: concurrent map writes

goroutine 871 [running]:
runtime.throw({0x10374c497, 0x15})
        /usr/local/go/src/runtime/panic.go:1198 +0x54 fp=0x140005958c0 sp=0x14000595890 pc=0x102d02af4
runtime.mapassign_fast64(0x103aa1920, 0x14000e7e8a0, 0x929be)
        /usr/local/go/src/runtime/map_fast64.go:176 +0x2f4 fp=0x14000595900 sp=0x140005958c0 pc=0x102cdc284
github.com/gitopia/go-git/v5/plumbing/format/idxfile.(*MemoryIndex).FindOffset(0x140010b5600, {0xa5, 0x6, 0xf0, 0x63, 0xfb, 0x6f, 0xe5, 0x6e, 0x8c, ...})
        /Users/harry-hov/go/pkg/mod/github.com/gitopia/go-git/[email protected]/plumbing/format/idxfile/idxfile.go:133 +0xf0 fp=0x14000595950 sp=0x14000595900 pc=0x10304cda0
github.com/gitopia/go-git/v5/storage/filesystem.(*ObjectStorage).findObjectInPackfile(0x140005be0b8, {0xa5, 0x6, 0xf0, 0x63, 0xfb, 0x6f, 0xe5, 0x6e, 0x8c, ...})
        /Users/harry-hov/go/pkg/mod/github.com/gitopia/go-git/[email protected]/storage/filesystem/object.go:531 +0xc8 fp=0x14000595a10 sp=0x14000595950 pc=0x103072f58
github.com/gitopia/go-git/v5/storage/filesystem.(*ObjectStorage).getFromPackfile(0x140005be0b8, {0xa5, 0x6, 0xf0, 0x63, 0xfb, 0x6f, 0xe5, 0x6e, 0x8c, ...}, ...)
        /Users/harry-hov/go/pkg/mod/github.com/gitopia/go-git/[email protected]/storage/filesystem/object.go:447 +0x88 fp=0x14000595b00 sp=0x14000595a10 pc=0x103072718
github.com/gitopia/go-git/v5/storage/filesystem.(*ObjectStorage).EncodedObject(0x140005be0b8, 0x1, {0xa5, 0x6, 0xf0, 0x63, 0xfb, 0x6f, 0xe5, 0x6e, ...})
        /Users/harry-hov/go/pkg/mod/github.com/gitopia/go-git/[email protected]/storage/filesystem/object.go:317 +0x4c fp=0x14000595bb0 sp=0x14000595b00 pc=0x103071b0c
github.com/gitopia/go-git/v5/plumbing/object.GetCommit({0x12bc4d378, 0x140005be0a0}, {0xa5, 0x6, 0xf0, 0x63, 0xfb, 0x6f, 0xe5, 0x6e, ...})
        /Users/harry-hov/go/pkg/mod/github.com/gitopia/go-git/[email protected]/plumbing/object/commit.go:55 +0x50 fp=0x14000595c00 sp=0x14000595bb0 pc=0x103025520
github.com/gitopia/git-server/utils.GetLastCommit.func1(0x14001431200, 0x14001430d80, 0x14001430d20, {0x1400110a330, 0xf}, {0x14000f1ab40, 0x28}, 0x140004f88a0, {0x103c46070, 0x140005be0a0})
        /Users/harry-hov/Desktop/work/git-server/utils/content.go:223 +0x1d4 fp=0x14000595f80 sp=0x14000595c00 pc=0x103719c34
runtime.goexit()
        /usr/local/go/src/runtime/asm_arm64.s:1133 +0x4 fp=0x14000595f80 sp=0x14000595f80 pc=0x102d36094
created by github.com/gitopia/git-server/utils.GetLastCommit
        /Users/harry-hov/Desktop/work/git-server/utils/content.go:210 +0x98

[harry-hov]

Possible solutions:

• Use mutex
• change map to sync.map to support concurrency go-git/go-git#186