func TestRevs(t *testing.T) {
g := Goblin(t)
RegisterFailHandler(func(m string, _ ...int) { g.Fail(m) })
g.Describe("_rev", func() {
g.Before(func() {
db.Erase()
db.Start()
})
g.After(func() {
db.End()
})
g.It("should generate _rev for a single key", func() {
savedrev, _ := db.SaveValueAt("/name", []byte(`"database of vehicles"`))
gottenrev, _ := db.GetValueAt("/name/_rev")
Expect(savedrev).To(BeEquivalentTo(gottenrev))
Expect(gottenrev).To(HavePrefix("1-"))
})
g.It("should generate _rev for parent keys", func() {
db.SaveValueAt("/vehicles/car/land", []byte("true"))
db.SaveValueAt("/vehicles/carriage/land", []byte("true"))
db.SaveValueAt("/vehicles/carriage/air", []byte("false"))
Expect(db.GetValueAt("/vehicles/car/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/car/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("3-"))
Expect(db.GetValueAt("/vehicles/carriage/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/carriage/_rev")).To(HavePrefix("2-"))
})
g.It("should bump _rev for single keys", func() {
db.SaveValueAt("/name", []byte(`"just a database of vehicles"`))
Expect(db.GetValueAt("/name/_rev")).To(HavePrefix("2-"))
})
g.It("should bump _rev for parent keys", func() {
db.SaveValueAt("/vehicles/car/water", []byte("false"))
Expect(db.GetValueAt("/vehicles/car/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/car/water/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/car/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("4-"))
Expect(db.GetValueAt("/vehicles/carriage/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/carriage/_rev")).To(HavePrefix("2-"))
db.SaveValueAt("/vehicles/boat/water", []byte("true"))
Expect(db.GetValueAt("/vehicles/car/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/car/water/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/boat/water/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/car/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/boat/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("5-"))
})
g.It("on delete, should bump _rev for parents and sons", func() {
db.DeleteAt("/vehicles/car")
Expect(db.GetValueAt("/vehicles/car/land/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/car/water/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/car/_rev")).To(HavePrefix("3-"))
Expect(db.GetValueAt("/vehicles/boat/water/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/boat/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("6-"))
Expect(db.GetValueAt("/vehicles/carriage/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/carriage/_rev")).To(HavePrefix("2-"))
})
g.It("should bump rev of all parents of affected keys", func() {
db.SaveTreeAt("/vehicles/boat", map[string]interface{}{
"water": true,
"land": false,
"air": false,
})
Expect(db.GetValueAt("/vehicles/car/land/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/car/water/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/car/_rev")).To(HavePrefix("3-"))
Expect(db.GetValueAt("/vehicles/boat/water/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/boat/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/boat/air/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/boat/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("7-"))
})
g.It("doing it again to make sure", func() {
db.SaveTreeAt("/vehicles", map[string]interface{}{
"car": map[string]interface{}{
"water": true,
},
"boat": map[string]interface{}{
"air": true,
},
})
Expect(db.GetValueAt("/vehicles/car/land/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/car/water/_rev")).To(HavePrefix("3-"))
Expect(db.GetValueAt("/vehicles/car/_rev")).To(HavePrefix("4-"))
Expect(db.GetValueAt("/vehicles/boat/water/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/boat/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/boat/air/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/boat/_rev")).To(HavePrefix("3-"))
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("8-"))
Expect(db.GetValueAt("/vehicles/carriage/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/carriage/_rev")).To(HavePrefix("2-"))
})
g.It("should bump the revs correctly when a tree operation involves deleting", func() {
db.SaveTreeAt("/vehicles", map[string]interface{}{
"carriage": map[string]interface{}{
"space": false,
"land": nil,
},
"boat": nil,
})
Expect(db.GetValueAt("/vehicles/car/_rev")).To(HavePrefix("4-"))
Expect(db.GetValueAt("/vehicles/boat/water/_rev")).To(HavePrefix("3-"))
Expect(db.GetValueAt("/vehicles/boat/land/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/boat/air/_rev")).To(HavePrefix("3-"))
Expect(db.GetValueAt("/vehicles/boat/_rev")).To(HavePrefix("4-"))
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("9-"))
Expect(db.GetValueAt("/vehicles/carriage/land/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/carriage/_rev")).To(HavePrefix("3-"))
})
g.It("should bump revs of intermediate paths when modifying a deep field", func() {
db.SaveValueAt("/vehicles/train/land/rail", []byte("true"))
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("10-"))
Expect(db.GetValueAt("/vehicles/train/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/train/land/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/train/land/rail/_rev")).To(HavePrefix("1-"))
db.DeleteAt("/vehicles/train")
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("11-"))
Expect(db.GetValueAt("/vehicles/train/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/train/land/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/train/land/rail/_rev")).To(HavePrefix("2-"))
db.SaveTreeAt("", map[string]interface{}{
"vehicles": map[string]interface{}{
"skate": map[string]interface{}{
"air": map[string]interface{}{
"carried": map[string]interface{}{
"_val": true,
},
},
},
},
})
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("12-"))
Expect(db.GetValueAt("/vehicles/skate/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/skate/air/_rev")).To(HavePrefix("1-"))
Expect(db.GetValueAt("/vehicles/skate/air/carried/_rev")).To(HavePrefix("1-"))
db.SaveTreeAt("", map[string]interface{}{
"vehicles": map[string]interface{}{
"skate": map[string]interface{}{
"air": map[string]interface{}{
"carried": nil,
},
},
},
})
Expect(db.GetValueAt("/vehicles/_rev")).To(HavePrefix("13-"))
Expect(db.GetValueAt("/vehicles/skate/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/skate/air/_rev")).To(HavePrefix("2-"))
Expect(db.GetValueAt("/vehicles/skate/air/carried/_rev")).To(HavePrefix("2-"))
})
g.It("should return rev", func() {
sk, err := db.GetSpecialKeysAt("/vehicles/skate")
Expect(err).ToNot(HaveOccurred())
Expect(sk.Rev).To(HavePrefix("2-"))
})
})
}
func setCommonVariables(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := getContext(r)
/* when the path is in the format /nanana/nanana/_val
we reply with the single value for that path, otherwise
assume the whole tree is being requested. */
ctx.path = r.URL.Path
ctx.wantsTree = true
ctx.localDoc = false
ctx.wantsDatabaseInfo = false
entityPath := ctx.path
pathKeys := db.SplitKeys(ctx.path)
nkeys := len(pathKeys)
ctx.lastKey = pathKeys[nkeys-1]
if nkeys > 1 && pathKeys[nkeys-2] == "_local" {
// workaround for couchdb-like _local/blablabla docs
// we use a different sublevel for local docs so we must
// acknowledge that somehow.
ctx.lastKey = db.UnescapeKey(db.JoinKeys(pathKeys[nkeys-2:]))
ctx.localDoc = true
} else if ctx.lastKey == "" {
// this means the request was made with an ending slash (for example:
// https://my.summadb.com/path/to/here/), so it wants couchdb-like information
// for the referred sub-database, and not the document at the referred path.
// to get information on the document at the referred path the request must be
// made without the trailing slash (or with a special header, for the root document
// and other scenarios in which the user does not have control over the presence
// of the ending slash).
ctx.wantsDatabaseInfo = true
if ctx.path == "/" {
ctx.path = ""
ctx.lastKey = ""
entityPath = ""
}
} else {
if ctx.lastKey[0] == '_' {
ctx.wantsTree = false
entityPath = db.JoinKeys(pathKeys[:nkeys-1])
if ctx.lastKey == "_val" {
ctx.path = db.JoinKeys(pathKeys[:nkeys-1])
ctx.lastKey = pathKeys[nkeys-1]
}
}
}
ctx.currentRev = ""
ctx.deleted = false
qrev := r.URL.Query().Get("rev")
hrev := r.Header.Get("If-Match")
drev := ""
ctx.providedRev = hrev // will be "" if there's no header rev
// fetching current rev
if !ctx.localDoc {
// procedure for normal documents
specialKeys, err := db.GetSpecialKeysAt(entityPath)
if err == nil {
ctx.currentRev = specialKeys.Rev
ctx.deleted = specialKeys.Deleted
}
} else {
// procedure for local documents
ctx.currentRev = db.GetLocalDocRev(ctx.path)
}
// body parsing
if r.Method[0] == 'P' { // PUT, PATCH, POST
/* filter body size */
b, err := ioutil.ReadAll(io.LimitReader(r.Body, 1048576))
ctx.body = b
if err != nil {
res := responses.BadRequest("request body too large")
w.WriteHeader(res.Code)
json.NewEncoder(w).Encode(res)
return
}
if ctx.lastKey != "_val" {
err = json.Unmarshal(ctx.body, &ctx.jsonBody)
if err != nil {
res := responses.BadRequest("invalid JSON sent as JSON")
w.WriteHeader(res.Code)
json.NewEncoder(w).Encode(res)
return
}
}
}
revfail := false
// rev checking
if qrev != "" {
if hrev != "" && qrev != hrev {
revfail = true
} else {
ctx.providedRev = qrev
}
}
drev = ""
if drevi, ok := ctx.jsonBody["_rev"]; ok {
drev = drevi.(string)
}
if drev != "" {
if qrev != "" && qrev != drev {
revfail = true
} else if hrev != "" && hrev != drev {
revfail = true
} else if qrev != "" && hrev != "" && qrev != hrev {
revfail = true
} else {
ctx.providedRev = drev
}
}
if revfail {
res := responses.BadRequest("different rev values were sent")
w.WriteHeader(res.Code)
json.NewEncoder(w).Encode(res)
return
}
ctx.exists = ctx.currentRev != "" && !ctx.deleted
context.Set(r, k, ctx)
next.ServeHTTP(w, r)
})
}