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Improve CMT reliability with partial provisioning fallback and smarter mobile version selection #94

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Merged
yasserfaraazkhan merged 2 commits into from
Aug 3, 2026
Merged

Improve CMT reliability with partial provisioning fallback and smarter mobile version selection #94

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90bb9fb
Improve CMT provisioning resilience and mobile server version selection
yasserfaraazkhan Jul 31, 2026
5d137e8
fix(review): align PR max-age fallback with default, retry cleanup de…
yasserfaraazkhan Jul 31, 2026
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2 changes: 1 addition & 1 deletion config/config-matterwick.default.json
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Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,7 @@
"E2EReleasePatternPrefix": "release-",
"E2ETestWorkflowNames": ["Electron Playwright Tests", "E2E", "Compatibility Matrix Testing"],
"E2EInstanceMaxAge": 6,
"E2EPRInstanceMaxAge": 24,
"E2EPRInstanceMaxAge": 8,
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"CMTTriggerWorkflowName": "CMT Provisioner",
"CMTTestWorkflowName": "Compatibility Matrix Testing"
}
101 changes: 97 additions & 4 deletions server/e2e_dryrun_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -508,7 +508,10 @@ func TestDryRun_MobileCMT(t *testing.T) {
assert.Equal(t, "https://v0-site3.example.com", s0["ios_site_1_url"])
assert.Equal(t, "https://v0-site4.example.com", s0["ios_site_2_url"])
assert.Equal(t, "https://v0-site5.example.com", s0["site_3_url"])
assert.NotContains(t, s0, "url")
// `url` stays populated (site-1) for release branches cut before mobile's
// five-server CMT rewrite: those workflows read ${{ matrix.server.url }} and would
// otherwise test against an empty server URL for a whole release cycle.
assert.Equal(t, "https://v0-site3.example.com", s0["url"])
// Older version: `latest` is omitted entirely (cmtServer.Latest is false, omitempty).
_, has0 := s0["latest"]
assert.False(t, has0, "older mobile entries must not carry the `latest` field")
Expand Down Expand Up @@ -1400,7 +1403,7 @@ func TestDryRun_ResolveCMTServerVersions(t *testing.T) {
s.githubAPIBase = srv.URL + "/"
s.Config.CMTServerVersions = nil

assert.Equal(t, []string{"10.11.19", "11.5.7", "11.6.4", "11.7.2", "11.8.0-rc3"}, s.cmtServerVersions())
assert.Equal(t, []string{"10.11.19", "11.5.7", "11.6.4", "11.7.2", "11.8.0-rc3"}, s.cmtServerVersions("desktop"))
})

t.Run("explicit CMTServerVersions override skips resolve", func(t *testing.T) {
Expand All @@ -1414,7 +1417,8 @@ func TestDryRun_ResolveCMTServerVersions(t *testing.T) {
s.githubAPIBase = srv.URL + "/"
s.Config.CMTServerVersions = []string{"10.11.22", "11.10.0-rc1"}

assert.Equal(t, []string{"10.11.22", "11.10.0-rc1"}, s.cmtServerVersions())
assert.Equal(t, []string{"10.11.22", "11.10.0-rc1"}, s.cmtServerVersions("desktop"))
assert.Equal(t, []string{"10.11.22", "11.10.0-rc1"}, s.cmtServerVersions("mobile"), "manual override applies to mobile too")
assert.False(t, called, "manual override must not hit the GitHub API")
})

Expand All @@ -1426,7 +1430,8 @@ func TestDryRun_ResolveCMTServerVersions(t *testing.T) {

assert.Equal(t, defaultCMTServerVersions, s.resolveCMTServerVersions())
assert.Equal(t, []string{"10.11.22", "11.7.7"}, defaultCMTServerVersions)
assert.Equal(t, defaultCMTServerVersions, s.cmtServerVersions())
assert.Equal(t, defaultCMTServerVersions, s.cmtServerVersions("desktop"))
assert.Equal(t, defaultCMTServerVersions, s.cmtServerVersions("mobile"))
})

t.Run("cap prefers trailing ESR over oldest feature minor", func(t *testing.T) {
Expand Down Expand Up @@ -1678,3 +1683,91 @@ func TestIsBuildReleaseBranch(t *testing.T) {
assert.False(t, isBuildReleaseBranch(ref), "must not match: %q", ref)
}
}

// TestDryRun_MobileCMTVersionSelection covers the mobile version set: newest ESR, latest
// production (newest non-ESR stable), and the current RC — one topology of five servers each.
func TestDryRun_MobileCMTVersionSelection(t *testing.T) {
releasesBody := `[
{"tag_name":"v11.8.0-rc3","draft":false,"prerelease":true,"body":"rc"},
{"tag_name":"v11.8.0-rc2","draft":false,"prerelease":true,"body":"rc"},
{"tag_name":"v11.7.2","draft":false,"prerelease":false,"body":"Mattermost Platform Extended Support Release 11.7.2"},
{"tag_name":"v11.7.1","draft":false,"prerelease":false,"body":"Mattermost Platform Extended Support Release 11.7.1"},
{"tag_name":"v11.6.4","draft":false,"prerelease":false,"body":"Mattermost Platform Release 11.6.4"},
{"tag_name":"v11.5.7","draft":false,"prerelease":false,"body":"Mattermost Platform Release 11.5.7"},
{"tag_name":"v10.11.19","draft":false,"prerelease":false,"body":"Mattermost Platform Extended Support Release 10.11.19"}
]`

t.Run("picks newest ESR + latest production + current RC", func(t *testing.T) {
srv := mockReleasesServer(t, releasesBody, http.StatusOK)
s := newDryRunServer(t, "", "mattermost")
s.githubAPIBase = srv.URL + "/"

// 11.7.2 is the newest ESR line, 11.6.4 the newest non-ESR stable, 11.8.0-rc3 the RC.
// 10.11.19 (older ESR) and 11.5.7 (older stable) are left out.
assert.Equal(t, []string{"11.6.4", "11.7.2", "11.8.0-rc3"}, s.resolveMobileCMTServerVersions())
})

t.Run("mobile selection is used for mobile and not for desktop", func(t *testing.T) {
srv := mockReleasesServer(t, releasesBody, http.StatusOK)
s := newDryRunServer(t, "", "mattermost")
s.githubAPIBase = srv.URL + "/"
s.Config.CMTServerVersions = nil

mobile := s.cmtServerVersions("mobile")
desktop := s.cmtServerVersions("desktop")
assert.Len(t, mobile, maxMobileCMTServerVersions)
assert.Greater(t, len(desktop), len(mobile), "desktop keeps its wider set")
})

t.Run("no RC in flight backfills with the next stable line", func(t *testing.T) {
body := `[
{"tag_name":"v11.7.2","draft":false,"prerelease":false,"body":"Mattermost Platform Extended Support Release 11.7.2"},
{"tag_name":"v11.6.4","draft":false,"prerelease":false,"body":"Mattermost Platform Release 11.6.4"},
{"tag_name":"v11.5.7","draft":false,"prerelease":false,"body":"Mattermost Platform Release 11.5.7"}
]`
srv := mockReleasesServer(t, body, http.StatusOK)
s := newDryRunServer(t, "", "mattermost")
s.githubAPIBase = srv.URL + "/"

// ESR 11.7.2 + latest production 11.6.4, then 11.5.7 backfills the empty RC slot.
assert.Equal(t, []string{"11.5.7", "11.6.4", "11.7.2"}, s.resolveMobileCMTServerVersions())
})

t.Run("an RC older than the newest stable is not selected", func(t *testing.T) {
body := `[
{"tag_name":"v11.6.0-rc1","draft":false,"prerelease":true,"body":"stale rc"},
{"tag_name":"v11.7.2","draft":false,"prerelease":false,"body":"Mattermost Platform Extended Support Release 11.7.2"},
{"tag_name":"v11.8.1","draft":false,"prerelease":false,"body":"Mattermost Platform Release 11.8.1"}
]`
srv := mockReleasesServer(t, body, http.StatusOK)
s := newDryRunServer(t, "", "mattermost")
s.githubAPIBase = srv.URL + "/"

got := s.resolveMobileCMTServerVersions()
assert.NotContains(t, got, "11.6.0-rc1", "a stale RC must not take the RC slot")
assert.Contains(t, got, "11.7.2")
assert.Contains(t, got, "11.8.1")
})

t.Run("no ESR flagged still fills the budget from stable lines", func(t *testing.T) {
body := `[
{"tag_name":"v11.8.1","draft":false,"prerelease":false,"body":"Mattermost Platform Release 11.8.1"},
{"tag_name":"v11.7.2","draft":false,"prerelease":false,"body":"Mattermost Platform Release 11.7.2"},
{"tag_name":"v11.6.4","draft":false,"prerelease":false,"body":"Mattermost Platform Release 11.6.4"}
]`
srv := mockReleasesServer(t, body, http.StatusOK)
s := newDryRunServer(t, "", "mattermost")
s.githubAPIBase = srv.URL + "/"

assert.Equal(t, []string{"11.6.4", "11.7.2", "11.8.1"}, s.resolveMobileCMTServerVersions())
})

t.Run("API error falls back to the default set", func(t *testing.T) {
srv := mockReleasesServer(t, "boom", http.StatusInternalServerError)
s := newDryRunServer(t, "", "mattermost")
s.githubAPIBase = srv.URL + "/"

assert.Equal(t, defaultCMTServerVersions, s.resolveMobileCMTServerVersions())
assert.LessOrEqual(t, len(defaultCMTServerVersions), maxMobileCMTServerVersions)
})
}
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